Blood protein linked to poor muscle health in older adults
For each standard deviation increase—a measure of variation—in an inflammatory protein, the odds of muscle-related problems were 1.37–1.71-fold higher in older adults.
An observational study of 323 community-dwelling older adults linked higher blood levels of CCL2, an inflammatory signalling protein, to sarcopenia, a condition involving low muscle mass and function. Higher levels also accompanied weaker grip strength and slower walking. Data from 54,219 UK Biobank participants also linked higher blood CCL2 to sarcopenia.
Other analyses pointed in a different direction. Gene-activity data from 818 people linked higher CCL2 activity in skeletal muscle to larger muscle cross-sectional area. A Mendelian randomization analysis, which uses genetic differences to examine associations, linked genetically predicted higher blood CCL2 to lower sarcopenia risk. The researchers suggested that elevated blood CCL2 may reflect a compensatory response to muscle deterioration rather than a cause of it.
Why it matters
Chronic inflammation accompanies aging. Understanding whether inflammatory signals contribute to muscle deterioration or help muscles respond to it matters for interpreting their role in age-related muscle decline.
Caveats
Observational associations cannot establish cause and effect, and the main cohort comprised community-dwelling older adults. The proposed compensatory response still needs testing of the underlying biological processes.
The paper
Hallym University Dongtan Sacred Heart Hospital; University of Ulsan College of Medicine
Endocrinology and Metabolism, 15 Oct 2026
