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HDL-C and Apolipoprotein A-I are Independently Associated with Skeletal Muscle Mitochondrial Function in Healthy Humans.
American Journal of Physiology. Heart and Circulatory Physiology 2024 Februrary 10
Prior animal and cell studies have demonstrated a direct role of high-density lipoprotein (HDL) and Apolipoprotein A-I (Apo A-I) in enhancing skeletal muscle mitochondrial function and exercise capacity. However, the relevance of these animal and cell investigations in humans remains unknown. Therefore, a cross-sectional study was conducted in 48 adults (67% female, 8% Black participants, age 39 ± 15.4 years) to characterize the associations between HDL measures, Apo A-I, and muscle mitochondrial function. Forearm muscle oxygen recovery time (tau) from post-exercise recovery kinetics was used to assess skeletal muscle mitochondrial function. Lipoprotein measures were assessed by nuclear magnetic resonance. HDL efflux capacity was assessed using J774 macrophages, radiolabeled cholesterol, and Apolipoprotein B-depleted plasma both with and without added cyclic adenosine monophosphate. In univariate analyses, faster skeletal muscle oxygen recovery time (lower tau) was significantly associated with higher levels of HDL cholesterol (HDL-C), ApoA-I, and larger mean HDL size, but not HDL cholesterol efflux capacity. Slower recovery time (higher tau) was positively associated with body mass index (BMI) and fasting plasma glucose (FPG). In multivariable linear regression analyses, higher levels of HDL-C and Apo A-I, as well as larger HDL size, were independently associated with faster skeletal muscle oxygen recovery times that persisted after adjusting for BMI and FPG (all p <0.05). In conclusion, higher levels of HDL-C, Apo A-I, and larger mean HDL size were independently associated with enhanced skeletal muscle mitochondrial function in healthy humans.
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