Skeletal muscles are organized into long fibers, and when a fiber breaks the entire fiber is often lost. This made a supporter worry that senolytic therapies might break a muscle fiber and eliminate precious fibers in aging muscles. It appears that the injury at the heart of the questioner’s worry does not happen in practice.
UNITY Biotechnology was the first senolytic startup out of the gate, and the failure of its Phase II trial in osteoarthritis was a crushing disappointment. A careful look back at the underlying science and three new scientific papers give us a good idea why and suggest ways to move forward.
One way senescent cells accumulate is when one senescent cell turns a neighboring cell senescent through SASP secretion. SRF scientists have discovered that these secondary senescent cells are resistant to the classic senolytic drugs. However, they have identified a new senolytic strategy that kills these senescent cells.