Rapamycin impairs mitochondrial function in guinea pig model
New research presented virtually at the American Physiological Society’s (APS) annual meeting at Experimental Biology 2021 explored the positive and negative effects of lifespan-extending drugs on mitochondrial function and age-related osteoarthritis (OA).
Decreased function of mitochondria—the energy centers of the cells—is a hallmark characteristic of aging. Maintaining mitochondrial function during the aging process while delaying age-related diseases, such as OA, could be a key to extending lifespan. Previous research has found that metformin, primarily used to treat type 2 diabetes, and rapamycin, a drug used to prevent organ transplant rejection, can extend lifespan and maintain physiological function in many animal models.
In a new study, researchers from the University of Wisconsin-Madison explored the effects of rapamycin, metformin or a regimen of both medications on a guinea pig model of OA. These drugs were chosen because they have been shown to expand lifespan and health-span through positive change in the mitochondria. The research team found that the animals treated with rapamycin and the two-drug combination had lower mitochondrial content in their muscles and the function of the mitochondria was impaired. In addition to changes in mitochondrial function, rapamycin treatment also led to a rise in blood glucose levels and worsened OA scores, a measure of disease severity. Read more.