September 14, 2019

An international team of researchers has found that the gut microbiota in mice play an influential role in skeletal muscle mass maintenance and function. In their paper published in the journal Science Translational Medicine, the group describes their experiments with wild and lab-raised mice, and what they found.

Skeletal  is one of the three main types of muscle—the other two are cardiac and smooth. Skeletal muscle is very much what it sounds like—the collection of muscles that are connected to bones in the skeleton that control movement, most specifically, the limbs.

To learn more about the possible impact of the microbiome on skeletal muscle mass, the researchers obtained several wild mice and compared their microbiota with germ-free mice (mice with no microbiome at all). Compared to the wild mice, the germ-free mice had atrophied skeletal muscles. They also expressed fewer chemicals that support muscle growth. The researchers found that the mice that lacked a microbiome had higher-than-normal levels of multiple amino acids—a sign of liver problems. They also found that the mice had lower levels of a precursor to a neurotransmitter called acetylcholine, which is involved in transmitting signals between skeletal muscle and nerves.

The researchers also found that transplanting gut microbiota containing material from wild mice into the guts of germ-free mice resulted in an increase in muscle mass and function. And they found that giving the germ-free mice  that are produced normally by microbes in the gut also partially restored muscle mass.

 

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