Androgenic alopecia, more commonly known as pattern hair loss or pattern baldness, is an extremely common form of hair loss. Four out of 5 men and 2 out of 5 women under the age of 70 have hair loss due to androgenic alopecia (aka androgenetic alopecia). While this form of hair loss is not deadly, or even dangerous, it can cause substantial amounts of personal suffering, low self-esteem, and diminished quality of life. Indeed, most people with androgenic alopecia or pattern hair loss would much rather stop their hair loss and cure their baldness. Here we talk about stem cell therapy for hair loss.
Unfortunately, there are few effective treatments for androgenic alopecia. Patients may choose to use topical medication, minoxidil. Men can use the drug finasteride. Neither of these agents is very effective for many people who try them. Some patients with pattern baldness opt for surgery. Surgical hair loss treatment can be helpful for men who have receding hairlines, but it is of little to no use in patients with diffusely thinning hair, which is most often the case in women affected by androgenic alopecia.
Scientists have turned to stem cell therapy for hair loss for a few reasons. First, the current medical and surgical treatment options are largely ineffective. Second, stem cell treatment has been shown to be safe in many scientific and clinical studies. Third and perhaps most importantly, androgenic alopecia is caused, in part, by problems with natural stem cell function. Immune cells (lymphocytes and mast cells) can be found in the area around each hair follicle, specifically in the “knot zone” which is where most hair follicle stem cells reside. These immune cells and hormonal factors likely interfere with hair follicle stem cell function—the number of hair follicle stem cells stays the same in pattern baldness, but the ability of progenitor cells to multiply is greatly reduced. Natural stem cells in people with androgenic alopecia do not produce the same levels of substances that support hair growth and renewal. In short, patients with pattern baldness may benefit from stem cell treatment.
Researchers are strenuously pursuing this line of research. One promising approach is to apply stem cells (fat and stromal vascular fraction cells) directly to the balding areas of the scalp. For example, Dr. Shin and colleagues used stem cells on 27 women with pattern baldness and showed increased hair thickness and density 12 weeks after treatment. Another approach is to use exosomes from these stem cells to treat hair loss. Exosomes are released by stem cells, contain virtually all the beneficial molecules that stem cells produce and can be applied to the scalp without surgery.
The field of stem
cell treatment for pattern hair loss is growing rapidly. As more clinical
trials are published, we move closer to a time in with stem cell and stem cell
exosome treatment for androgenic alopecia becomes a reality.
The spinal column is made up of more than a dozen vertebral bones stacked on top of each other. Since the spine is not a single bone, it is capable of pivoting and bending, which gives the torso a degree of flexibility. A key part of this structure relies on the substance between the vertebral bones called the intravertebral disc.
The intravertebral disc is made up of the annulus fibrosis (the tough outer ring) and the nucleus pulposus (the jelly-like inner core). Each intervertebral disc acts as a shock absorber between the vertebral bones. Over time and with age, however, the intervertebral disc tends to breakdown. This can cause called degenerative disc disease, which includes herniated discs (“slipped discs”), pinched nerves, neck and back pain, and nerve problems. Obviously, finding ways to reverse or prevent intravertebral discs from breaking down is of great medical and scientific interest and for the countless patients with degenerative disc disease.
As with other groups interested in regenerative medicine, researchers have turned to stem cells in an effort to regenerate tissue within the intravertebral disc. One research group reported their recent success using bone marrow-derived mesenchymal stem cells. The scientists collected exosomes—very small packets filled with highly concentrated molecules such as proteins, microRNA, transcription factors and lipids—from these stem cells. In this study, researchers also collected exosomes from nucleus pulposus cells and tested the exosomes in various ways.
The researchers found that exosomes could send out signals to bone marrow mesenchymal cells and call them to the intervertebral disc. The exosomes also prompted the stem cells to become new nucleus pulposus-like cells. Conversely, exosomes from bone marrow mesenchymal cells caused nucleus pulposus cells to grow and multiply (i.e. proliferate). Finally, exosomes helped the tissue in degenerating vertebral discs to express the same genes as healthy discs.
While these results are complex, they suggest that exosomes from bone marrow mesenchymal cells and nucleus pulposus cells work together to recruit and make more healthy cells in degenerating vertebral discs. This could have profound implications for the millions of people with degenerative disc disease. If these results are confirmed in clinical trials, it would mean that exosomes could be used to prevent or reverse degenerative disc disease. We anxiously await further work in this exciting field.
Reference: Kang L. et al. (2017). Exosomes as potential alternatives to stem cell therapy for intervertebral disc degeneration: in-vitro study on exosomes in interaction of nucleus pulposus cells and bone marrow mesenchymal stem cells. Stem Cell Research Therapy. 2017; 8: 108.
The field of Regenerative Medicine has shown great promise for helping those with a variety of chronic diseases, including arthritis. Indeed, data on the potential value of using stem cells to address issues relating to arthritis have been growing. While specific stem cells like mesenchymal stem cells have demonstrated therapeutic effects in models of arthritis and other inflammatory diseases, the specific ways in which these cells confer their benefits are not yet well understood. Given that these stem cells contain different types of elements, it is important that research establishes which of these elements is critical to the therapeutic properties of stem cells.
A recent study, published in Theranostics, looked specifically at the different effects that small exosomes and larger microparticles from within mesenchymal stem cells have on the inflammatory processes that occur in arthritis. To conduct their experiment, scientists isolated the exosomes and microparticles from mesenchymal stem cells using an ultracentrifugation technique and then exposed the exosomes and the microparticles to cells of the immune system – specifically, T and B lymphocytes, which are implicated in arthritis.
What the researchers found was that, in their models of arthritis, both the exosomes and the microparticles suppressed the T lymphocyte proliferation that is indicative of inflammation. However, unlike microparticles and even parental mesenchymal stem cells, the exosomes were also able to induce other anti-inflammatory effects. The result of exosome activity was, therefore, more efficient blunting of inflammation.
These results point to the potential of not just stem cells, but specifically the exosomes of these cells, in therapeutically addressing inflammatory arthritis. While more research is needed to understand how these exosomes could actually impact arthritis patients, these data provide hope that stem cells and even just elements of stem cells will help these patients by improving their ability to combat problematic inflammation.
Reference: Cosenza, S. et al. (2018). Mesenchymal stem cells-derived exosomes are more immunosuppressive than microparticles in inflammatory arthritis. Theranostics, 8(5), 1399-1410.
Much of the medical research and clinical applications of stem cell therapy have thus far focused on stem cells and their potential to repair damaged or diseased tissue that has not responded to conventional therapies. Though there has been a lot of evidence to suggest that the use of certain types of stem cells can be safe, experts have suggested that strategies for therapy using exosomes that can avoid the use of living stem cells may provide an even better opportunity to slow the progression of various diseases.
Paracrine secretions have been shown to play a significant role in the ability of stem cells to improve disease conditions, and exosomes are a key element of these secretions. From a functional standpoint, exosomes enable stem cells to transfer their genetic information to other cells residing in the damaged tissue.
Because these are responsible for some of the critical benefits of stem cells, researchers have speculated that the use of exosomes rather than stem cells may provide specific advantages in some therapeutic contexts. A review in Stem Cells International has provided a comprehensive overview of what is known so far about the potential role of exosomes in stem cell therapy.
Exosomes are released from a wide variety of stem cell types and influence the functioning of nearby cells and tissues. Their use alone may offer better therapeutic results. Indeed, they have shown particular promise in addressing symptoms of many conditions.
Researchers are hopeful that exosomes will be able to help patients in new and innovative ways, more research is needed to determine the best way to apply them in stem cell therapy.
Reference: Han, C. et al. (2016). Exosomes and their therapeutic potentials of stem cells. Stem Cells International, 1-11.
Periodontal disease, better known as gum disease, is very common. About half of all adults have chronic gum disease, and as many as 15% had severe periodontal disease. In periodontal disease, the gums become red and inflamed. The tissues that connect the tooth to the bone, such as the periodontal ligament, are damaged or destroyed. Chronic periodontal disease can even invade and destroy jaw bone. Making matters worse, as the gums recede, they can collect bacteria in spaces called periodontal pockets. Over time, these periodontal pockets can become dental abscesses. As the gums become more and more diseased, the affected tooth or teeth may fall out.
The treatment for periodontal disease varies depending on its severity. Good oral hygiene including regular brushing and flossing can reverse mild periodontitis. A dentist can deeply clean, probe and disrupt periodontal pockets. In more severe cases, topical antiseptics or oral antibiotics may be required. Less often, a dental surgeon must remove diseased areas of gum and bone.
Periodontitis usually chronic and causes significant ongoing inflammation. Thus, the gums take a long time to heal. In many cases, periodontal disease can be difficult to treat.
Fortunately, dental researchers have been exploring ways to use mesenchymal stem cells to help the healing process. More specifically, they have been using the exosomes released by mesenchymal stem cells. Exosomes are small packets of proteins, RNA, and other molecules that help promote growth and tissue regeneration. Since exosomes are not cells, they are much easier to collect, store, transport, and administer to patients. Most importantly, exosomes appear to contain all of the things that make stem cells so powerful in regenerative medicine.
In a 2019 study, Dr. Chew and colleagues used exosomes collected from mesenchymal stem cells to treat rats with periodontal disease. The researchers noticed that animals treated with exosomes healed much faster than untreated animals. Exosomes taken from mesenchymal stem cells promoted periodontal tissue regeneration helped grow new bone and regrew periodontal ligaments. The researchers also found that exosomes were able to recruit new cells to replace the damaged ones.
This scientific research is an exciting breakthrough in the fields of dentistry and periodontics. Chew and co-authors have shown that mesenchymal stem cell exosomes could enhance periodontal tissue regeneration without any adverse effects. The scientists go on to state that these findings will serve as the basis for future “cell-free” exosome treatments for periodontal disease. This is certainly good news for the more than 150 million Americans with periodontitis.
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