If you or someone you care about has been diagnosed with a spinal cord injury, you understand how life-altering the challenges can be. At Stemedix, we work with patients who have already received a confirmed diagnosis and are seeking alternative ways to support their recovery goals. While no treatment guarantees a cure, regenerative medicine offers the potential to support healing and reduce the impact of symptoms through biologically active therapies.
Stem cell therapy for spinal cord injury is one such approach that may help promote cellular repair, reduce inflammation, and encourage nerve support. You won’t find exaggerated claims or comparisons here, just realistic, patient-focused information backed by experience. We customize each treatment plan using the documentation you provide, and we support you throughout your journey. This article will walk you through the basics of spinal cord injury, explain how stem cells for the treatment of spinal cord injury are used, and outline what to expect with our process.
What is Spinal Cord Injury?
A spinal cord injury (SCI) is damage to the spinal cord that disrupts communication between the brain and the body. When this pathway is damaged, the body’s ability to send and receive signals becomes impaired. That can mean a loss of movement, sensation, or automatic functions like bladder and bowel control. Most spinal cord injuries happen because of sudden trauma. Studies show that the most common causes of SCI were automobile crashes (31.5%) and falls (25.3%), followed by gunshot wounds (10.4%), motorcycle crashes (6.8%), diving incidents (4.7%), and medical/surgical complications (4.3%).
The spinal cord does not regenerate the way some tissues in the body do. This makes the injury permanent in many cases. The outcome depends on where the injury occurred and how much of the nerve pathway is still intact.
Types and Locations of Spinal Cord Injuries
Spinal cord injury (SCI) is classified by severity, complete or incomplete, and by the spinal region affected. A complete injury results in loss of all movement and sensation below the injury site, while incomplete injuries allow some function. The spinal region involved guides recovery and therapy goals.
Cervical nerve injuries (C1–C8) impact the neck, arms, hands, and breathing, with higher levels possibly requiring ventilation support. Thoracic injuries (T1–T12) affect chest and abdominal muscles, impacting balance and trunk control. Lumbar and sacral injuries (L1–S5) influence leg movement and bladder function, with outcomes varying based on injury extent and completeness.
Common Symptoms and Challenges After SCI
Patients with SCI may experience paralysis, sensory loss, chronic pain, and complications in daily functions. Spinal cord injury affects more than movement. Many patients deal with muscle spasticity, pressure injuries due to immobility, frequent urinary tract infections, and problems with body temperature control. Autonomic dysreflexia, a sudden increase in blood pressure triggered by stimuli below the injury level, is a serious risk in those with injuries at or above T6. Emotional and psychological responses, including anxiety and depression, are also common and require support.
At Stemedix, we recognize that each spinal cord injury is unique. We tailor every treatment plan based on the medical records and information you provide, not generalized assumptions. If you’re exploring stem cells for the treatment of spinal cord injury, our team is ready to walk you through options that align with your health history and functional goals.
What is Regenerative Medicine?
Regenerative medicine supports the body’s repair mechanisms by introducing biologically active materials. This field focuses on helping your body respond to damage by using living cells and biological components. Instead of masking symptoms, regenerative treatments aim to influence the cellular environment that surrounds the injured tissue. In many cases, this includes the use of stem cells and growth factors.
For individuals with a spinal cord injury, regenerative medicine introduces new options that may encourage healing responses the body struggles to activate on its own. While this type of therapy doesn’t replace rehabilitation, it may work alongside your current efforts to promote tissue stability and reduce secondary complications.
Stem Cell Therapy as a Treatment Option for SCI
Stem cell therapy for spinal cord injury is being explored to support recovery and symptom relief. Researchers are investigating how stem cells may influence the biological environment of an injured spinal cord. You won’t find a generalized approach here. Stem cell treatment for spinal cord injury is tailored to each case based on the location of injury, severity, and medical history.
The focus is not on reversing the damage or offering a cure. Instead, stem cells for the treatment of spinal cord injury may help by releasing chemical signals that support the health of nearby nerve cells, protect against further breakdown, and potentially stimulate limited repair processes. Some patients have reported improvements in muscle control, sensation, or bladder regulation, though outcomes vary and remain under study.
How Stem Cells Work to Support Healing
Stem cells can develop into specialized cell types and secrete proteins that support tissue repair. These cells have two key roles in regenerative medicine. First, they can adapt to different cell types, such as those found in the nervous system. Second, and equally important, they release helpful proteins, like cytokines and growth factors, that create a healing-friendly environment. This may reduce chronic inflammation and improve communication between nerve cells that remain intact.
In spinal cord injury cases, these cells may influence glial scar formation, improve blood flow to the damaged region, and protect vulnerable cells from oxidative stress. For example, studies have shown that transplanted mesenchymal stem cells can release brain-derived neurotrophic factor (BDNF), which plays a role in supporting neural survival.
At Stemedix, we offer regenerative therapy based on the existing diagnosis and medical documentation provided by each patient. Our approach respects the experimental nature of this therapy while offering guidance and structure throughout the process.
Potential Benefits of Stem Cell Therapy for Spinal Cord Injury
Exploring the potential benefits of stem cell therapy gives you a chance to learn how regenerative medicine may support certain aspects of your spinal cord injury recovery. While results vary for each individual, many patients report improvements in pain, movement, and physical function over time.
Pain Reduction and Muscle Relaxation
Many patients report decreased neuropathic pain and reduced muscle tension following therapy. Neuropathic pain is one of the most common and challenging symptoms following spinal cord injury. You may experience burning, tingling, or shooting sensations due to misfiring nerves. For some individuals receiving stem cell therapy for spinal cord injury, these symptoms become less intense or more manageable. This could be related to how certain types of stem cells interact with immune cells and inflammatory pathways.
Studies have suggested that mesenchymal stem cells (MSCs), for example, can release bioactive molecules that influence the environment surrounding injured nerves and even interact with neural cells in spine and brain conditions. In some cases, patients also describe less spasticity or tightness in the muscles, which can reduce discomfort during sleep or daily movement.
Improved Circulation and Motor Function
Stem cell treatment for spinal cord injury may support vascular health and contribute to smoother movement. Reduced blood flow after a spinal cord injury can limit your body’s ability to heal or respond to therapy. You might notice cold extremities, swelling, or slower wound healing. Stem cell therapy may support microvascular repair by promoting angiogenesis, the formation of new blood vessels in damaged tissues. This improved circulation helps deliver oxygen and nutrients more efficiently to the affected areas. Some individuals receiving stem cell therapy report smoother joint movement, greater control over posture, and better balance during transfer or mobility tasks.
Increased Muscle Strength and Abilities
Muscle engagement and strength may increase as nerve signals improve. After a spinal cord injury, the connection between your brain and muscles may be disrupted or weakened. Over time, this can lead to muscle wasting or limited control. For individuals receiving stem cell treatment for spinal cord injury, some report noticeable changes in muscle tone, voluntary movement, or strength, especially in the lower limbs or core. These observations tend to occur in cases where some nerve pathways remain intact.
For example, a patient with an incomplete thoracic injury might regain the ability to perform assisted standing exercises or show improvements in hip stability. While not every case leads to increased muscle output, any gains in strength can contribute to mobility training, sitting tolerance, and daily activities.
Patient Experience and Reported Outcomes
Individuals receiving therapy frequently describe improvements in mobility, energy levels, and daily activity. Each patient arrives with unique goals. Some hope to walk again. Others want to reduce fatigue or rely less on medications. After therapy, individuals often share changes that impact their quality of life, such as being able to transfer with less assistance, participate in treatment longer, or sleep more comfortably.
At Stemedix, we focus on your specific history, symptoms, and expectations before building a treatment plan. These outcomes help us communicate realistic possibilities, while always making it clear that regenerative medicine is still considered experimental.
How Stemedix Approaches Stem Cell Therapy for SCI
Every individual with a spinal cord injury has a different medical background and a different journey. That’s why your treatment experience with Stemedix begins with your history, not just your condition.
Customized Treatment Based on Patient History
Stemedix develops treatment plans based on medical records submitted by the patient. If you’ve already received a spinal cord injury diagnosis, our team starts by reviewing the medical documents you send us. This includes imaging studies, physician assessments, and any other relevant details about your injury. By focusing on those who have already completed a diagnostic evaluation, we’re able to provide a more appropriate regenerative therapy experience.
We do not perform physical exams or order MRIs. If your current records are outdated, we can help gather updated information on your behalf once you sign a simple medical release form. This makes sure that our team has the most accurate data to tailor a regenerative approach based on your unique condition, designing therapy around what your body truly needs, not generalized assumptions.
Role of Board-Certified Physicians and Care Coordinators
Each case is reviewed by board-certified physicians experienced in regenerative medicine. When you choose to move forward, your medical information is assessed by physicians who specialize in regenerative therapies. They have experience working with spinal cord injury patients and understand how stem cell therapy may support certain biological functions involved in healing.
Patients are supported by dedicated Care Coordinators who handle logistics, scheduling, and communication. You won’t be left navigating the details alone. Once your evaluation is underway, a Care Coordinator will work closely with you to keep the process on track. This includes walking you through the next steps, answering questions, and helping schedule your treatment. Having one point of contact makes the entire journey easier to follow and less overwhelming.
Patient Support Services and Accommodations
Stemedix offers assistance with travel arrangements, transportation, and medical support equipment. Whether you’re located nearby or traveling across the country, we help remove logistical barriers. Our team can coordinate hotel stays, provide complimentary ground transportation, and arrange for wheelchair-accessible options if needed.
Whether a patient is local or traveling from another state, Stemedix helps coordinate hotels and driver services to make the process more accessible. Your focus should be on preparing for therapy, not stressing over logistics.
Getting Started with Stemedix
How to Connect with a Care Coordinator
Our Care Coordinators are ready to assist you at every step. They can answer your questions, review your medical documents, and guide you through the application process. From your initial inquiry through follow-up care, they provide consistent support to help you understand the next steps in pursuing stem cell therapy for spinal cord injury.
What to Expect During the Treatment Process
Once your case is reviewed and approved by our physicians, you will receive a customized treatment plan with a scheduled date for your therapy. Treatment is provided in a licensed medical facility under the supervision of experienced professionals. After treatment, ongoing follow-up is available to monitor your progress and provide additional support as needed.
Contact Stemedix Today
If you are interested in learning more about stem cell treatment for spinal cord injury, request an information packet today. The team at Stemedix is here to guide you on your journey to better health. Call us at (727) 456-8968 or email yourjourney@stemedix.com to know more.
Parkinson’s disease (PD) is a common, progressive neurological disorder that primarily affects movement. It occurs when brain cells that produce a chemical called dopamine begin to die, particularly in a part of the brain called the substantia nigra. Dopamine plays a crucial role in controlling movement, so when these cells are lost, people experience symptoms such as tremors, stiffness, slow movements, and trouble with balance.
While there are medications that help control symptoms, these treatments don’t stop the disease from progressing. Over time, their effectiveness may wear off, and they can cause unpleasant side effects. This has led scientists to explore new options – one of the most promising being stem cell therapy. This blog explores how stem cells might help treat Parkinson’s, what types of stem cells are being studied, and what we can expect in the near future.
The Challenge of Treating Parkinson’s Disease
Current treatments for PD mainly focus on managing symptoms, not curing the disease. The most commonly used drug is levodopa, which the body converts into dopamine. While levodopa helps relieve movement symptoms, it doesn’t only act where it’s needed. It floods the brain more broadly, which can lead to unwanted effects like hallucinations, cognitive problems, and involuntary movements (called dyskinesias).
Also, as the disease progresses, people often experience “motor fluctuations,” where the medication wears off before the next dose is due, making symptoms come and go unpredictably. More advanced therapies, such as deep brain stimulation or special levodopa gels, can help some people, but they’re not suitable or affordable for everyone.
In short, while medications help many people live better with Parkinson’s, they don’t solve the underlying problem: the loss of dopamine-producing cells. This is where regenerative medicine – and especially stem cells – comes in.
The Promise of Stem Cells in Parkinson’s Treatment
Stem cells are special cells that can turn into many different types of cells in the body. Importantly, they can also replicate themselves, giving researchers a potentially endless supply of cells to work with. For Parkinson’s, the idea is to turn stem cells into dopamine-producing neurons (the kind that die off in PD) and then implant them into the brain. Ideally, these new cells would settle into the right areas and start working like the original ones did – releasing dopamine in a natural, balanced way.
This targeted, biological approach might avoid many of the side effects of current drug treatments. It also holds the potential for long-lasting effects, possibly even slowing or stopping disease progression. Over the years, researchers have experimented with different kinds of cells to achieve this goal, but stem cells are currently the most promising option.
Types of Stem Cells Being Studied
Embryonic Stem Cells (ESCs)
These stem cells come from early-stage embryos (usually donated from in vitro fertilization). They can become any cell type in the body. Scientists have worked for years to coax these cells into becoming the specific type of dopamine-producing neurons lost in Parkinson’s. Early versions of this approach had inconsistent results – sometimes the cells didn’t fully become the right type of neuron, or the process produced too few usable cells.
However, advances in understanding how brain cells develop during embryonic stages have helped improve these techniques. Scientists now have better protocols that consistently produce authentic dopaminergic neurons – the ones from the midbrain region involved in movement control.
Even though results are getting better, some challenges remain. ESC-based treatments require immunosuppression, because the implanted cells aren’t from the patient’s own body and could be rejected. But despite these hurdles, clinical trials using ESC-derived neurons are expected to begin soon, marking a significant step forward.
Induced Pluripotent Stem Cells (iPSCs)
Introduced in 2007, iPSCs offer an exciting alternative. These are adult cells (like skin or blood cells) that scientists reprogram to become stem cells. Like ESCs, iPSCs can turn into almost any cell type, including dopamine-producing neurons.
One major advantage of iPSCs is that they can be made from a person’s own cells. This opens the door for personalized treatment – using your own cells to create brain implants – reducing the risk of immune rejection and the need for long-term immunosuppressive drugs.
So far, iPSC-based therapies have shown promise in animal studies, including in primates. Grafted cells survived, didn’t form tumors, extended connections to the brain’s movement centers, and improved movement symptoms. As with ESCs, human trials using iPSC-derived neurons are expected to begin soon.
Mesenchymal Stem Cells (MSCs)
MSCs come from adult tissues such as bone marrow. They’re easier to obtain than ESCs or iPSCs and don’t raise the same ethical concerns. However, they don’t naturally become dopamine-producing neurons. While they can produce some dopamine-related proteins in the lab, they don’t fully develop into the authentic neuron types needed for Parkinson’s treatment.
Still, MSCs may have other benefits. They release factors that reduce inflammation and protect brain cells from damage. These properties could help slow down disease progression or support other treatments, but so far, they haven’t been shown to improve movement symptoms directly. More research is needed to determine their role in PD therapy.
Induced Neurons (iNs)
Another approach is to directly convert a person’s regular body cells (like skin cells) into neurons without going through a stem cell stage. This avoids the risk of the cells turning into tumors, which is a theoretical concern with stem cells. These so-called induced neurons could also be made from a patient’s own cells.
Unfortunately, this method is still in its early days. The process doesn’t produce many cells, and results have been inconsistent. Right now, it’s not seen as a practical option for widespread treatment, but researchers are exploring ways to improve the technique.
There’s also some interest in trying this direct conversion inside the brain – turning support cells (astrocytes) into neurons in the patient’s brain itself. While intriguing, this concept is still highly experimental.
Progress in Stem Cell Research for Parkinson’s
The journey toward stem cell therapy for Parkinson’s has taken decades, but recent discoveries have helped clear many of the obstacles that held progress back. For instance, researchers now understand better how to guide stem cells into becoming the exact type of neurons needed for treatment. They’ve also developed quality control markers to ensure the cells being implanted are the right kind and at the right stage of development.
Animal studies have shown that these therapies can be safe and effective, leading to improvements in motor function without serious side effects. We’re now at the point where human trials using both ESCs and iPSCs are about to begin or are already in progress. These trials will help answer important questions about safety, effectiveness, and long-term outcomes.
Stem Cell Therapy: A Promising Future for Parkinson’s Treatment
Stem cell therapy is not a guaranteed cure for Parkinson’s disease, but it stands out as one of the most promising advancements in the effort to combat this debilitating condition. If successful, these therapies could offer more natural dopamine delivery, helping to reduce the side effects commonly associated with current medications. They may also provide longer-lasting benefits, potentially minimizing the need for frequent doses. By using a patient’s own cells, the treatments could be tailored for personalized care, and perhaps most significantly, they may introduce a new way to slow the progression of the disease rather than simply masking its symptoms.
There’s still significant work ahead. Clinical trials take time, and important questions remain about cost, access, and how to manufacture these treatments on a large scale. Even so, science continues to move forward at a rapid pace, and growing optimism can be felt throughout the medical community.
Parkinson’s disease remains a major challenge for patients, their families, and healthcare providers. While traditional medications can offer some relief, they do not offer a cure. As stem cell research accelerates, we may be moving closer to a future in which therapies don’t just manage symptoms – but help restore lost function and improve quality of life.
Source: Stoker TB. Stem Cell Treatments for Parkinson’s Disease. In: Stoker TB, Greenland JC, editors. Parkinson’s Disease: Pathogenesis and Clinical Aspects [Internet]. Brisbane (AU): Codon Publications; 2018 Dec 21. Chapter 9. Available from: https://www.ncbi.nlm.nih.gov/books/NBK536728/ doi: 10.15586/codonpublications.par
Alzheimer’s disease affects millions of people around the world, but women seem to carry a larger burden. In fact, nearly two-thirds of all Alzheimer’s cases are found in women. While it’s true that women tend to live longer than men – and age is the greatest risk factor for Alzheimer’s – researchers now believe that’s not the whole story.
Recent studies have revealed a much more complex picture involving brain biology, hormones, genetics, and even social and cultural experiences. One key moment in a woman’s life – menopause – might be a critical piece of the puzzle.
Dr. Roberta Brinton, a neuroscientist at the University of Arizona, has spent over three decades researching why women are more vulnerable to Alzheimer’s. Her interest in the subject began when she met a woman named Dr. Rowena Ansbacher, a clinical trial participant with early Alzheimer’s. After a heartfelt conversation, Brinton witnessed the sharp impact of memory loss when Ansbacher no longer recognized her moments later. That experience motivated Brinton to focus her career on understanding the female brain’s unique vulnerability to cognitive decline.
The Menopause Connection
As women reach midlife, they begin to experience menopause – a natural process that marks the end of menstrual cycles and a significant drop in estrogen levels. While estrogen is best known for its role in reproduction, it also plays a major part in how the brain functions. Estrogen helps brain cells use glucose for energy, supporting memory, attention, and overall cognitive function.
When estrogen levels fall, the brain struggles to get the energy it needs. Dr. Brinton’s research shows that in response, brain cells may start using alternate energy sources – including the brain’s own white matter, a fatty tissue that supports communication between brain cells. This “self-cannibalization” process can damage brain structures and potentially raise the risk of Alzheimer’s.
Brain Imaging Reveals More
Dr. Lisa Mosconi, a neuroscientist at Weill Cornell Medical College, has used brain scans to compare men’s and women’s brains during midlife. Her research shows that women between ages 40 and 65 have:
22% less brain glucose metabolism (less energy available for brain activity)
11% less white matter
30% more Alzheimer’s-related plaques compared to men the same age
Mosconi emphasizes that Alzheimer’s doesn’t suddenly appear in old age – it likely begins decades earlier, around the same time many women enter menopause. These early changes may go unnoticed but could signal increased risk later in life.
Not Every Woman Develops Alzheimer’s – So What Else Plays a Role?
While every woman goes through menopause, not all develop Alzheimer’s. Researchers believe that a mix of genetic, hormonal, and lifestyle factors shape a woman’s risk.
For example, women with metabolic syndrome – marked by high blood sugar, high triglycerides, or blood pressure problems – are more likely to develop Alzheimer’s after menopause. Risk is even higher for women who carry a specific gene called APOE4, which is strongly linked to Alzheimer’s.
Fortunately, midlife may offer a window of opportunity to lower that risk. By managing conditions like high blood pressure and metabolic syndrome during menopause, women may be able to support long-term brain health.
The Role of Hormone Therapy in Brain Health
One potential strategy for supporting women’s brain health during menopause is hormone replacement therapy (HRT), which restores estrogen levels. In a large review study, Dr. Brinton found:
Women using HRT for 1–3 years had a 40% lower risk of developing Alzheimer’s or Parkinson’s.
Women using HRT for 3–6 years saw a 60% risk reduction.
Women on HRT for more than 6 years experienced an 80% lower risk.
These findings are promising, but HRT is not without controversy. Some studies suggest it could increase dementia risk, particularly if started later in life. Timing may be everything: starting HRT during menopause might protect the brain, while starting it years later may not offer the same benefits – or could even be harmful.
Experts, including Dr. Michelle Mielke from Wake Forest University, agree that HRT can be safe for short-term use to relieve menopausal symptoms. However, they caution that it shouldn’t be used solely to prevent Alzheimer’s, especially without discussing individual risk factors with a physician.
Estrogen Exposure Over a Lifetime Matters
Estrogen’s protective effects seem to depend not only on menopause but also on how long a woman is exposed to the hormone throughout her life. A 2020 study of 15,000 women found:
Women with shorter reproductive spans (less than 34 years between first period and menopause) had a 20% higher risk of dementia.
Women who started menstruating at 16 or older had a 31% higher Alzheimer’s risk than those who started around age 13.
Women who had their ovaries and uterus removed had an even higher risk.
Interestingly, the study also found that women with three or more children had a 12% lower Alzheimer’s risk, possibly due to social support and caregiving benefits that come with having a larger family.
Social and Cultural Factors: Beyond Biology
While hormones and genetics matter, social and cultural experiences also shape brain health. Around the world, Alzheimer’s rates in women vary by country. In some places, such as England and Australia, dementia has become the leading cause of death for women. These patterns may reflect not just biology, but life history – including war, famine, education access, and societal gender roles.
For example, in post-World War II Europe, older women often faced severe stress, limited education, and fewer job opportunities. These early-life disadvantages can affect cognitive function decades later.
Women with higher education levels tend to have better “cognitive reserve” – the brain’s ability to compensate for damage. Research shows that women who work in mentally demanding jobs experience slower memory decline as they age. Yet, historically, many women were denied equal access to education and career advancement, reducing their opportunity to build this cognitive reserve.
The Role of Structural Sexism
Newer research is also uncovering how societal-level discrimination – known as structural sexism – affects brain health. A study led by Justina Avila-Rieger at Columbia University analyzed 21,000 women and compared their memory performance to the level of sexism in the state where they were born. Women who grew up in states with higher levels of sexism – such as fewer women in leadership, larger wage gaps, and less workplace equality – experienced faster memory decline after age 65.
Black women were disproportionately affected, suggesting that discrimination based on both gender and race takes a heavier toll on brain health. The stress of lifelong inequality can lead to chronic inflammation, which may damage brain cells and increase dementia risk over time.
“We tend to focus on biology,” Avila-Rieger says, “but changing the social environment may have an even bigger impact on women’s health.”
A Call for Better Research
Historically, women have been underrepresented in medical research – even though they are more likely to get Alzheimer’s. Until recently, most dementia studies were not designed to explore sex differences, and many clinical trials still don’t include enough female participants. As a result, many Alzheimer’s symptoms in women may go undiagnosed or misinterpreted.
For example, women tend to perform better on common memory tests, which can mask early signs of cognitive decline. When they do report symptoms, doctors may dismiss them as stress, anxiety, or depression.
Meanwhile, research funding also falls short. In 2019, just 12% of NIH Alzheimer’s research funding went to women-focused projects. A nonprofit analysis found that doubling investment in female-focused dementia research would ultimately save nearly $1 billion by reducing healthcare costs and time spent in nursing homes.
Moving Toward a More Inclusive Approach
Experts say we need a broader approach to understanding and preventing Alzheimer’s in women. That means:
Supporting hormone balance during midlife through healthy lifestyle choices- and, in some cases, HRT under medical supervision
Managing chronic health conditions like high blood pressure, diabetes, and metabolic syndrome
Reducing gender-based stressors and addressing structural inequalities
Increasing women’s access to education and cognitively stimulating careers
Prioritizing research that includes sex and gender differences
Dr. Mosconi, who now leads a $50 million global program focused on Alzheimer’s in women, believes we’re just scratching the surface. “We owe women centuries of research,” she says.
A New Chapter in Alzheimer’s Prevention
Alzheimer’s disease is not simply a disease of old age – it may begin years, even decades, before symptoms appear. For women, especially, the transition into menopause could be an important turning point. By paying attention to hormonal health, lifestyle risks, and the effects of social and cultural inequality, we may be able to change the course of Alzheimer’s and improve outcomes for future generations of women.
Source: Moutinho, S. Women twice as likely to develop Alzheimer’s disease as men — but scientists do not know why. Nat Med 31, 704–707 (2025). https://doi.org/10.1038/s41591-025-03564-3
Spinal cord injury (SCI) is among the most devastating injuries a person can face, often resulting in partial or complete paralysis and a significant loss of independence. Recovery is usually limited, even with the best available care, leaving millions worldwide with lifelong challenges. Over the past two decades, however, researchers have focused on new ways to encourage healing after SCI. One of the most promising areas involves cell transplantation – particularly the use of stem cells.
In this review, Sugai et. al provides an overview of recent clinical studies and discusses potential advancements anticipated in the future.
Understanding Spinal Cord Injury
SCI occurs when the spinal cord sustains damage, either from trauma like accidents or falls, or from non-traumatic causes such as tumors or degeneration. This damage interrupts communication between the brain and the rest of the body, leading to impairments in movement, sensation, or autonomic functions like breathing and digestion. As the global population ages, SCI cases are increasing due to more frequent minor accidents like falls. Unfortunately, current treatments – such as steroids or neuroprotective drugs – have failed to produce consistent, meaningful recovery for most patients.
The Promise of Stem Cells
Stem cells have the remarkable ability to develop into various cell types and aid tissue repair. In SCI, they offer potential in replacing damaged nerve cells, supporting the injured spinal cord, or creating an environment conducive to healing. Since the early 2000s, clinical trials exploring stem cell therapy for SCI have increased steadily. Multiple stem cell types are under investigation, each presenting unique benefits and challenges for promoting recovery.
Types of Stem Cells in SCI Research
Neural stem/progenitor cells (NS/PCs) can differentiate into several types of nerve cells. These cells may originate from fetal tissue, embryonic stem (ES) cells, or induced pluripotent stem (iPS) cells – adult cells reprogrammed to a stem-like state. NS/PCs are promising because they could directly replace damaged spinal tissue, but they typically require surgical implantation into the spinal cord. iPS-derived NS/PCs, a newer option, may reduce immune rejection risk since they can be patient-specific.
Mesenchymal stem/stromal cells (MSCs), found in bone marrow and other tissues, help heal by secreting factors that reduce inflammation and encourage tissue repair rather than transforming into nerve cells. These cells can be administered intravenously or injected near the spinal cord and are generally low-risk in terms of side effects or tumor formation. Researchers are still working to fully understand how MSCs aid recovery.
Schwann cells and olfactory ensheathing cells (OECs) naturally support nerve growth and regeneration by protecting and guiding new nerve fibers. These cells are relatively safe and usually delivered surgically to the injury site, similar to NS/PCs.
Progress and Milestones
The first human trials using fetal NS/PCs began in 2006, followed by studies with ES-derived NS/PCs in 2009. These early trials established that stem cell transplantation is generally safe but did not result in significant functional improvements. In 2020, Japan launched the first clinical trial using iPS-derived NS/PCs, which remains ongoing. These cells are especially promising due to their versatility and personalized nature.
MSCs-based therapies have also shown encouraging results, particularly in the subacute phase of SCI – the period shortly after injury. A treatment called Stemirac, developed in Japan, has received conditional approval there, marking a significant step forward, although no stem cell therapy has yet been approved by the FDA for SCI in the U.S.
Cell Delivery Methods and Their Impact
The route by which stem cells are delivered to the spinal cord is critical to treatment success. Direct injection into the injury site (intralesional delivery) is the most precise method, allowing the cells to reach the exact area of damage. However, it is also the riskiest and requires highly skilled surgeons to navigate delicate tissue.
Intrathecal injection introduces cells into the spinal fluid, offering a safer, less invasive alternative. While cells can circulate within the central nervous system, not all may reach the injury site, potentially limiting effectiveness.
Intravenous injection is the least invasive, delivering cells through the bloodstream. Although easiest to administer, many cells can be trapped in organs like the lungs before reaching the spinal cord, reducing their therapeutic impact.
Each delivery method involves a trade-off between precision, safety, and ease of use, and ongoing research seeks to determine the best balance.
Challenges in SCI Stem Cell Research
Developing effective stem cell therapies for SCI is extraordinarily complex. One major challenge is the variability of spinal injuries – no two SCIs are exactly the same. Even small differences in injury location cause wide variations in symptoms and recovery potential, complicating treatment design.
Patient factors such as age, overall health, mental resilience, and rehabilitation access further influence outcomes. These variables add complexity to clinical trials, making it difficult to isolate treatment effects.
Measuring improvement is another hurdle. For example, thoracic spinal injuries control fewer muscle groups, so subtle functional gains may go unnoticed. Without clear markers of progress, judging treatment effectiveness remains challenging.
Recruiting patients for trials is also difficult. Many potential participants have complex medical profiles that disqualify them, resulting in small study sizes that limit statistical power.
Despite these obstacles, researchers continue refining methods and adapting trial designs to advance the field.
Emerging Innovations in SCI Treatment
While no stem cell therapy has yet become a standard treatment for SCI, the field is progressing with cautious optimism. Gene editing offers a promising avenue by enabling scientists to modify transplanted cells, reducing immune rejection and adding safety features like “suicide switches” that can eliminate cells if necessary.
Advances in imaging, such as functional MRI, allow researchers to monitor nerve function more precisely, detecting subtle changes and providing better insights into treatment effects.
Artificial intelligence (AI) is also beginning to assist in analyzing complex clinical data, identifying patterns, and guiding research directions, potentially accelerating discovery.
Combining stem cell therapy with intensive rehabilitation shows promise, as physical therapy may amplify the benefits of regenerative treatments and enhance recovery.
Additionally, non-regenerative technologies like brain–spine interfaces are making strides in restoring movement by bypassing damaged nerves. Though beneficial, these devices require ongoing use and do not repair spinal tissue, keeping regenerative therapies a primary focus.
Progress in Stem Cell Therapy for Spinal Cord Injury
As of mid-2024, the FDA has approved 39 cell or gene therapies overall, yet none target neurological conditions like SCI. This underscores the tremendous challenges involved in repairing the brain and spinal cord. The expense, risk, and complexity have caused some pharmaceutical companies to abandon spinal cord research. Nonetheless, scientists continue with ongoing efforts to refine techniques, explore new cell types, and approach patient healing holistically.
The authors conclude that while stem cell therapy for SCI is still experimental, major advances have been made in understanding how stem cells function, the best ways to deliver them, and how to measure outcomes. Although regenerative medicine cannot yet cure SCI, it is steadily advancing toward breakthroughs that could greatly improve quality of life for those affected.
Knee osteoarthritis (OA) is a long-term condition that affects millions of people worldwide. It occurs when the cartilage in the knee begins to break down, often due to aging, injury, or repeated stress on the joint. Early signs of OA include swelling, stiffness, and pain in the knee. Over time, the condition worsens, leading to a narrowing of the space between bones, the development of bony growths (osteophytes), and reduced joint mobility. This progression can significantly impact a person’s quality of life, especially in older adults.
One of the major challenges in treating knee OA is the poor ability of cartilage to repair itself. Cartilage lacks blood vessels and relies on nearby joint fluid and surrounding tissues for nutrients, making it especially vulnerable to damage. As a result, finding effective ways to heal or regenerate damaged cartilage has been a major focus of research in recent years.
In this review, Zhang et al. summarize the basic research and clinical studies to promote inflammatory chondrogenesis in the treatment of OA and provide a theoretical basis for clinical treatment.
The Role of Stem Cells in Cartilage Repair
Researchers have explored several treatment options for OA, including injections of corticosteroids, platelet-rich plasma, sodium hyaluronate, and more recently, stem cells. Among the various stem cell types being studied, human umbilical cord mesenchymal stem cells (HUC-MSCs) have shown promising results.
HUC-MSCs are a type of stem cell collected from the umbilical cords of newborns. These cells are especially attractive for medical use because they are easy to obtain, do not cause pain or harm to the donor, and are free from the ethical concerns that sometimes surround embryonic stem cells. They have also demonstrated the ability to multiply, change into different cell types (including cartilage cells), and regulate inflammation in the body.
Biological Benefits of HUC-MSCs in OA Treatment
According to the authors, what sets HUC-MSCs apart is their ability to both repair cartilage and control the inflammatory processes that worsen OA. These cells release helpful substances like cytokines, growth factors, and extracellular vesicles that support cartilage repair and reduce joint inflammation. HUC-MSCs can also develop into chondrocytes – cells that produce and maintain healthy cartilage.
In studies comparing HUC-MSCs to bone marrow-derived stem cells, HUC-MSCs have shown a higher potential for cartilage formation and a lower tendency to become fat or bone cells. These qualities make them a strong candidate for regenerating joint cartilage in OA patients. Additionally, the extracellular matrix (ECM) they produce is rich in type II collagen, which is essential for building strong, healthy cartilage.
Another biological benefit of HUC-MSCs is their ability to function well in low-oxygen environments, such as the interior of a joint. This makes them well suited for surviving and thriving in the harsh conditions of damaged knee joints. They also produce anti-inflammatory proteins like IL-10 and TGF-β1, which help reduce pain and inflammation, making the joint environment more suitable for healing.
Clinical Use of HUC-MSCs and Evidence of Effectiveness
Over the past decade, HUC-MSCs have been tested in laboratory studies, animal models, and human clinical trials. Results consistently show that these cells can improve symptoms, protect joint structures, and possibly slow the progression of OA.
In animal models of OA, researchers found that injecting HUC-MSCs into the knee joint helped reduce cartilage breakdown and cell death. In these studies, both single and repeated injections produced similar benefits, including better cartilage matrix production and less joint degeneration.
In human trials, HUC-MSCs have been tested in patients with moderate to severe OA. Results show improved joint function, reduced pain, and even signs of new cartilage formation on imaging studies. When compared to traditional treatments like sodium hyaluronate injections, HUC-MSC therapy has been shown to offer faster, longer-lasting relief and more meaningful improvements in joint health.
Additionally, treatment with HUC-MSCs has proven to be well tolerated and safe, with no serious side effects reported. Minor discomfort after the injection was typically short-lived and did not require medical intervention.
Mechanisms of Action and How HUC-MSCs Promote Healing
Zhang et al. found that HUC-MSCs help reduce the harmful effects of OA in several ways. First, they lower levels of inflammatory molecules like IL-1β, TNF-α, and IL-6 that are commonly found in arthritic joints. These substances are responsible for breaking down cartilage and increasing pain. HUC-MSCs also block enzymes such as MMP-13 and ADAMTS-5, which are known to degrade the cartilage structure.
At the same time, HUC-MSCs boost the production of cartilage-supporting proteins like collagen type II, aggrecan, and SOX9. These proteins are critical for rebuilding and maintaining the smooth, elastic tissue that cushions the ends of bones in the joint.
In addition to their anti-inflammatory and regenerative properties, HUC-MSCs influence the immune system by shifting inflammatory cells from a damaging state to a healing state. This shift helps calm the immune response within the joint and supports the repair process.
Several key cell signaling pathways – such as PI3K/Akt, mTOR, and Notch – are involved in this regenerative process. These pathways help control cell survival, growth, and the formation of new cartilage. As researchers continue to uncover how these pathways work, the authors anticipate new possibilities for targeted therapies will emerge.
Advantages Over Traditional and Other Stem Cell Treatments
Compared to other types of stem cells, such as those taken from bone marrow or fat tissue, HUC-MSCs offer multiple advantages. They are more readily available, easier to collect, and carry less risk of causing an unwanted immune response. They also multiply faster, have a greater capacity to form cartilage, and are less likely to develop into bone or fat cells – features that are particularly important when the goal is to repair joint cartilage.
Unlike treatments that simply reduce symptoms, such as painkillers or steroid injections, HUC-MSC therapy has the potential to address the root cause of OA by rebuilding damaged cartilage and rebalancing the joint’s internal environment.
Because of these advantages, the authors believe HUC-MSCs may represent a major step forward in the treatment of OA, especially for patients who have not responded well to traditional therapies or who are looking for a regenerative option before considering surgery.
A Promising Path Forward for Osteoarthritis Care
Human umbilical cord mesenchymal stem cells offer a new and exciting option for patients with knee osteoarthritis. With their ability to reduce inflammation, promote cartilage repair, and restore joint function, HUC-MSCs are rapidly becoming an important focus in regenerative medicine. As more research is conducted and the science behind these cells becomes clearer, they may soon become a standard part of OA treatment, offering hope for millions of people living with joint pain and stiffness.
Zhang P, Dong B, Yuan P, Li X. Human umbilical cord mesenchymal stem cells promoting knee joint chondrogenesis for the treatment of knee osteoarthritis: a systematic review. J Orthop Surg Res. 2023 Aug 29;18(1):639. doi: 10.1186/s13018-023-04131-7. PMID: 37644595; PMCID: PMC10466768.
Systemic lupus erythematosus (SLE) is a complex autoimmune disease that can damage many different parts of the body, including the kidneys, lungs, brain, and blood system. Because it can attack so many organs, it often leads to serious illness and even death.
For many years, doctors have used medications like corticosteroids, cyclophosphamide (CTX), and mycophenolate mofetil (MMF) to control the disease. These treatments have helped patients live longer and have reduced the chances of severe organ failure. However, even with these medications, controlling SLE can still be very difficult for some patients.
Researchers have also developed newer drugs that target specific parts of the immune system, such as rituximab, belimumab, and tocilizumab, among others. While these drugs have improved outcomes for many people, they can sometimes cause serious side effects or lead to the disease coming back once the medication is stopped. Because of these challenges, scientists have been searching for new ways to treat SLE, and one promising option is stem cell therapy.
As part of this review, Yuan et al. explore how stem cells are being used to treat lupus, including the different types of stem cells, the challenges involved, and what the future of treatment may hold.
Hematopoietic Stem Cells and Their Role in Lupus Treatment
Hematopoietic stem cells (HSCs) are the type of stem cells that create all other blood cells. First discovered in 1961, HSCs have become important in treating both blood cancers and autoimmune diseases. In 1997, doctors began using HSC transplants (HSCT) to treat patients with both blood cancers and autoimmune diseases. The results demonstrated that not only did the cancers improve, but the autoimmune symptoms also got better.
Since then, many studies around the world have tested HSCT in people with SLE, and the results have been very encouraging – with patients even showing signs of what researchers call a “fundamental cure,” meaning their disease improved dramatically over the long term.
How Lupus Affects Stem Cells
SLE itself can harm the body’s natural stem cells. Research has shown that people with lupus have lower levels of circulating HSCs and endothelial progenitor cells (which help repair blood vessels). This loss of stem cells may be caused by an increase in programmed cell death, known as apoptosis. As a result, lupus patients may have a harder time repairing blood vessels, leading to problems like atherosclerosis (hardening of the arteries).
Other studies have found that certain changes in the immune system can make stem cells more likely to die off. For example, increased activity in a pathway called mTOR has been linked to poor blood cell production in mice with autoimmune diseases. However, research has also shown the opposite, with lupus conditions causing an increase in stem cells that behave abnormally.
Because of these differences, the authors indicate the need for further research to fully understand how lupus affects stem cells.
Comparing Hematopoietic and Mesenchymal Stem Cells
Because of the challenges with hematopoietic stem cells, researchers have also explored using mesenchymal stem cells (MSCs). MSCs come from bone marrow, fat tissue, or umbilical cord blood, and they have powerful anti-inflammatory and immune-regulating effects.
Clinical studies have shown that about 60% of patients responded well to the treatment, and there were very few serious side effects. This finding opened the door to a whole new field of lupus treatment research.
One significant difference between HSCT and MSC therapy is that MSCs do not require the intense and risky immune system wipe-out that HSCT does. Instead, MSCs can be infused into the body and work to rebalance the immune system naturally. Because of this, MSC therapy is generally safer, has fewer complications, and is more affordable than HSCT.
Another reason MSCs are so promising is that bone marrow MSCs from lupus patients often show structural and functional abnormalities, which means that transplanting healthy MSCs from a donor could help correct some of the immune system issues at the root of the disease.
Animal studies have strongly supported the effectiveness of MSCs in treating lupus, and early clinical trials in humans have shown encouraging results. Phase I and II studies suggest that MSC therapy is both safe and effective for SLE patients, but further larger clinical trials are needed to confirm these findings and to better understand exactly how MSCs help heal the immune system.
The Future of Stem Cell Therapy for Lupus
Stem cell therapy offers exciting new possibilities for patients with SLE who have not had success with traditional treatments. Hematopoietic stem cell transplants have been shown to help many patients, sometimes even achieving long-term remission. However, because of the high risks and costs involved, HSCT is likely to remain a treatment reserved for the most severe and treatment-resistant cases.
Mesenchymal stem cell therapy, on the other hand, appears to offer a safer, more accessible option that could benefit a much larger number of patients. With fewer side effects, lower relapse rates, and easier treatment protocols, MSCs are quickly becoming a major focus of research into better lupus treatments.
At the same time, the authors continue to study exactly how stem cells work to regulate the immune system. They are also working on ways to improve the safety and effectiveness of both HSCT and MSC treatments. According to Yuan et al, goals for the future include finding better ways to prevent infections, lowering relapse rates, and understanding the long-term effects of stem cell therapy. Researchers are also exploring how to personalize stem cell therapies based on each patient’s unique immune system and genetic background, which could lead to even better outcomes.
Yuan et al. conclude that while traditional lupus treatments have made great strides over the past few decades, there is still a significant need for new and better therapies, especially for patients whose disease does not respond to standard medications.
Stem cell therapy, particularly with mesenchymal stem cells, represents a promising new frontier in the fight against lupus. Ongoing research and clinical trials will help clarify how best to use stem cells to treat SLE safely and effectively, offering new hope for people living with this challenging disease.
Source: Yuan X, Sun L. Stem Cell Therapy in Lupus. Rheumatol Immunol Res. 2022 Jul 6;3(2):61-68. doi: 10.2478/rir-2022-0011. PMID: 36465325; PMCID: PMC9524813.
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