Scientists have discovered that protein particles found in menstrual blood may hold a key to regenerating cartilage, offering a potential new avenue for treating osteoarthritis, the most common form of arthritis. The findings, published in Nature Scientific Reports, indicate that these particles, known as extracellular vesicles, can stimulate the growth of new cartilage in laboratory settings.
Osteoarthritis occurs when the protective cartilage in joints breaks down due to injury or age-related wear. Current treatments for severe cases often involve hip or knee replacement surgeries, which carry risks of infection, tissue damage, and persistent pain. Regenerative medicine research aims to find ways to regrow damaged cartilage without artificial implants.
Researchers at the Kaunas University of Technology in Lithuania utilized extracellular vesicles derived from menstrual blood. These vesicles, secreted by stem cells, play a crucial role in tissue repair and immune regulation. In lab tests, these particles were applied to biological scaffolds placed on damaged bone tissue samples. After three days, significant increases were observed in cartilage-making cells (chondrocytes), collagen, and proteoglycans—components essential for cartilage structure and joint lubrication.
This approach could offer advantages over traditional stem cell therapies. Unlike transplanted cells, extracellular vesicles are less likely to trigger immune rejection as they primarily act as biological messengers stimulating regeneration and reducing inflammation. Furthermore, they cannot divide uncontrollably to form unwanted tissue. This characteristic makes them a potentially safer alternative to stem cell transplantation.
While promising, experts caution that this research is in its early stages. "This is an interesting study, but early in terms of translation into a clinical therapy," said Professor Karina Wright, director of the Centre for Science and Technology in Medicine at Keele University. She noted that while mesenchymal stromal cells (MSCs) from menstrual blood have been explored for cartilage defects with varied success, extracellular vesicles are showing more recent promise. Professor Mark Wilkinson of the University of Sheffield suggested that the treatment might aid in healing existing cartilage rather than forming new cartilage from the vesicles themselves.
Menstrual blood is considered an accessible source for these vesicles. The mesenchymal stromal cells (MSCs) found in menstrual blood were identified over 20 years ago and are known for their ability to differentiate into various specialized cell types, dividing more rapidly than bone marrow stem cells. Their collection is also less invasive compared to harvesting stem cells from bone marrow.