News Release 

Rapamycin may exacerbate age-related arthritis despite life-extending benefits

Rapamycin impairs mitochondrial function in guinea pig model

Experimental Biology

Research News

Rockville, Md. (April 27, 2021)--New research to be presented this week virtually at the American Physiological Society's (APS) annual meeting at Experimental Biology 2021 explores 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 healthspan 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.

These results suggest "there may be an indirect connection between impaired skeletal muscle mitochondrial function to exacerbated OA after rapamycin treatment," said Christian Elliehausen, first author of the study. More research is needed to examine if it is possible to "harness the positive effects of rapamycin while minimizing the negative effects," Elliehausen explained.

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NOTE TO JOURNALISTS: To schedule an interview with a member of the research team, or to request the abstract, "Skeletal muscle mitochondrial bioenergetics in a model of primary osteoarthritis after treatment with rapamycin and/or metformin," please contact the APS Communications Office or call 301.634.7314. Find more research highlights in the APS Newsroom.

About Experimental Biology 2021

Experimental Biology is the annual meeting of five societies that explores the latest research in physiology, anatomy, biochemistry and molecular biology, investigative pathology and pharmacology. With a mission to share the newest scientific concepts and research findings shaping clinical advances, the meeting offers an unparalleled opportunity for global exchange among scientists who represent dozens of scientific areas, from laboratory to translational to clinical research.

About the American Physiological Society

Physiology is a broad area of scientific inquiry that focuses on how molecules, cells, tissues and organs function in health and disease. The American Physiological Society connects a global, multidisciplinary community of more than 10,000 biomedical scientists and educators as part of its mission to advance scientific discovery, understand life and improve health. The Society drives collaboration and spotlights scientific discoveries through its 16 scholarly journals and programming that support researchers and educators in their work.

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