Key result
Genetically predicted hyperlipidemia links to reduced muscle mass in bidirectional Mendelian randomization.
Why the study?
To analyze the bi-directional causal relationship between lipid profile and characteristics related to muscle atrophy.
Does a bi-directional causal relationship exist between lipid profiles and characteristics related to muscle atrophy in individuals of European ancestry?
Does a bi-directional causal relationship exist between lipid profiles and characteristics related to muscle atrophy in individuals of European ancestry?
This bi-directional Mendelian randomization study suggests a causal interplay where hyperlipidemia may reduce muscle mass, while increased muscle mass conversely lowers lipid levels, highlighting a potential link between dyslipidemia management and sarcopenia prevention.
May not yet alter lipid or sarcopenia care; hypothesis-generating for bidirectional causality in Europeans.
BACKGROUND: The aim of this study was to analyze the bi-directional causal relationship between lipid profile and characteristics related to muscle atrophy by using a bi-directional Mendelian randomization (MR) analysis. METHODS: The appendicular lean mass (ALM), whole body fat-free mass (WBFFM) and trunk fat-free mass (TFFM) were used as genome-wide association study (GWAS) data for evaluating muscle mass; the usual walking pace (UWP) and low grip strength (LGS) were used as GWAS data for evaluating muscle strength; and the triglycerides (TG), total cholesterol (TC), high density lipoprotein cholesterol (HDL), low density lipoprotein cholesterol (LDL), apolipoprotein A-1 (Apo A-1), and apolipoprotein B (Apo B) were used as GWAS data for evaluating lipid profile. For specific investigations, we mainly employed inverse variance weighting for causal estimation and MR-Egger for pleiotropy analysis. RESULTS: MR results showed that the lipid profile predicted by genetic variants was negatively correlated with muscle mass, positively correlated with UWP, and was not causally correlated with LGS. On the other hand, the muscle mass predicted by genetic variants was negatively correlated with lipid profile, the UWP predicted by genetic variants was mainly positively correlated with lipid profile, while the LGS predicted by genetic variants had no relevant causal relationship with lipid profile. CONCLUSIONS: Findings of this MR analysis suggest that hyperlipidemia may affect muscle mass and lead to muscle atrophy, but has no significant effect on muscle strength. On the other hand, increased muscle mass may reduce the incidence of dyslipidemia.
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Chen et al. (2023) studied Muscle atrophy and dyslipidemia. Genetically predicted lipid profile and muscle atrophy characteristics was evaluated on Causal estimates of bi-directional relationships between lipid profile (TG, TC, HDL, LDL, Apo A-1, Apo B) and muscle mass/strength. Bi-directional Mendelian randomization analysis suggested that hyperlipidemia may negatively affect muscle mass leading to muscle atrophy, while increased muscle mass may reduce the incidence of dyslipidemia.
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