Ask the Expert: What Are Stem-Cell and Exosome Therapies?

Stem-cell and exosome therapies are now being tested as a treatment for a wide range of health concerns, including tissue and organ injuries, autoimmune conditions, blood diseases, and inflammatory diseases. Researchers are also studying them for their potential to boost athletic performance and enhance longevity.

Yet many people aren’t sure what these regenerative-medicine therapies are, how they work, or what their risks might be.

Stem-cell therapy involves introducing live stem cells into the body for tissue repair and cellular integration. Stem cells can be injected into a particular area, such as a degenerated joint, or administered via an IV and put into general circulation. Their regenerative potential lies in their ability to change into various types of cells.

Stem cells also secrete exosomes, which are bioactive signaling vesicles. These nano-sized substances carry proteins, lipids, mRNA, and microRNA that affect cell-to-cell communication and influence cell behavior. Exosomes act as messengers to stimulate repair processes and help restore immune function.

But there are concerns about stem-cell treatments. Because stem cells replicate, they may lead to the formation of tumors. They also have the potential to migrate and provoke immune rejection.

Exosomes alone, on the other hand, do not replicate and are less likely to create an immune response. Researchers are increasingly discussing their potential use in neurology, orthopedics, dermatology, cardiology, and oncology.

The most common side effects of exosome treatments are local redness or swelling at the injection site and flu-like symptoms after injection. Allergic reactions are rare but can include itching, hives, or, in severe cases, breathing difficulties that require immediate medical attention.

Regenerative medicine is highly regulated by the U.S. Food and Drug Administration (FDA), which has issued several safety notifications and consumer alerts concerning stem-cell and exosome products and therapies over the past half-dozen years. The FDA has not yet approved exosome products for use.

Stem-cell and exosome therapies may eventually lead to a wide range of beneficial outcomes, but more study into their safety and effectiveness is needed before we can explore their full potential.