As we age, our cells undergo a process called cellular senescence, which involves a permanent arrest of cell growth and division. This process is thought to contribute to aging and age-related diseases. Skeletal muscle is a highly regenerative organ that comprises ~45% of body mass and enables skeletal movements while also regulating metabolism. In skeletal muscle, cellular senescence has been linked to muscle wasting and weakness, which can impair mobility and increase the risk of falls and fractures in older adults.

A recent study that looked at the effects of a protein called NANOG on the cellular aging process, specifically in skeletal muscle myogenic progenitor cells (MPCs). The researchers found that MPCs from old mice had a distinct gene expression signature associated with cellular senescence. The researchers also found that NANOG, a protein known to play a role in embryonic development and stem cell maintenance, was effective at reducing multiple hallmarks of cellular senescence in MPCs, including autophagy, energy homeostasis, genomic stability, nuclear integrity, and heterochromatin maintenance. NANOG expression in senescent MPCs allowed them to regain their capacity to proliferate in vitro and in vivo, meaning they were able to grow and divide more effectively both in a laboratory setting and in living organisms.

The researchers suggest that understanding the mechanisms of NANOG’s actions may lead to the discovery of druggable targets (i.e. targets that can be targeted by drugs) and facilitate the design of small molecules that can mimic the anti-aging effects of NANOG. Overall, this study suggests that targeting cellular senescence in skeletal muscle MPCs may be a promising strategy for improving muscle regeneration and function in aging adults. The findings also highlight the potential of NANOG as a therapeutic target for developing new treatments for age-related diseases.

In short, this promising research could lead to the discovery of new drugs that could reverse aging—at least in our very important muscle cells.