Systemic and skeletal muscle ANP/GCA deficiency in mice promotes metabolic disturbances, prediabetes, insulin resistance, and altered mitochondrial function.
Does ANP/GCA deficiency cause insulin resistance and mitochondrial dysfunction in skeletal muscle?
ANP/GCA signaling controls muscle mitochondrial integrity and oxidative capacity in vivo, and its deficiency plays a causal role in the development of prediabetes.
Type 2 diabetes (T2D) and obesity are strongly associated with low natriuretic peptide (NP) plasma levels and a down-regulation of NP guanylyl cyclase receptor-A (GCA) in skeletal muscle and adipose tissue. However, no study has so far provided evidence for a causal link between atrial NP (ANP)/GCA deficiency and T2D pathogenesis. Here, we show that both systemic and skeletal muscle ANP/GCA deficiencies in mice promote metabolic disturbances and prediabetes. Skeletal muscle insulin resistance is further associated with altered mitochondrial function and impaired endurance running capacity. ANP/GCA-deficient mice exhibit increased proton leak and reduced content of mitochondrial oxidative phosphorylation proteins. We further show that GCA is related to several metabolic traits in T2D and positively correlates with markers of oxidative capacity in human skeletal muscle. Together, these results indicate that ANP/GCA signaling controls muscle mitochondrial integrity and oxidative capacity in vivo and plays a causal role in the development of prediabetes.
Carper et al. (Wed,) conducted a other in Type 2 diabetes and prediabetes. ANP/GCA deficiency vs. Normal ANP/GCA signaling was evaluated on Metabolic disturbances, prediabetes, and mitochondrial function. Systemic and skeletal muscle ANP/GCA deficiency in mice promotes metabolic disturbances, prediabetes, insulin resistance, and altered mitochondrial function.