Scientists find molecule that could reverse muscle weakness with age

Scientists have identified a molecule called cardiolipin that plays a key role in muscle weakening with age, according to ScienceDaily Health.

Muscle tissue contains fast-twitch fibers for quick movements and slow-twitch fibers for sustained activity, which have more mitochondria producing energy. Aging muscles shift toward more slow-twitch fibers even though mitochondria become less efficient.

Cardiolipin, found in the inner membrane of mitochondria, maintains their structure and function. Its levels decrease in aging muscles, leading to less energy production and cellular dysfunction.

In mice, partially restoring cardiolipin reversed signs of muscle wasting and prevented premature death, suggesting potential new treatments for age-related muscle decline.

This discovery helps explain why aging muscles rely more on slow-twitch fibers despite mitochondrial decline, revealing a hidden defense mechanism that sacrifices strength to protect muscle cells from damage.