DR-region of Na+/K+-ATPase is a target to ameliorate hepatic insulin resistance in obese diabetic mice.

ABSTRACT: Reduced hepatic Na+/K+-ATPase (NKA) activity and NKA?1 expression are engaged in the pathologies of metabolism diseases. The present study was designed to investigate the potential roles of NKA?1 in hepatic gluconeogenesis and glycogenesis in both hepatocytes and obese diabetic mice. Methods: Insulin resistance was mimicked by glucosamine (GlcN) in either human hepatocellular carcinoma (HepG2) cells or primary mouse primary hepatocytes. Obese diabetic mice were induced by high-fat diet (HFD) feeding for 12 weeks. Results: We found that both NKA activity and NKA?1 protein level were downregulated in GlcN-treated hepatocytes and in the livers of obese diabetic mice. Pharmacological inhibition of NKA with ouabain worsened, while activation of NKA?1 with an antibody against an extracellular DR region of NKA?1 subunit (DR-Ab) prevented GlcN-induced increase in gluconeogenesis and decrease in glycogenesis. Likewise, the above results were also corroborated by the opposite effects of genetic knockout/overexpression of NKA?1 on both gluconeogenesis and glycogenesis. In obese diabetic mice, hepatic activation or overexpression of NKA?1 stimulated the PI3K/Akt pathway to suppress hyperglycemia and improve insulin resistance. More importantly, loss of NKA activities in NKA?1+/- mice was associated with more susceptibility to insulin resistance following HFD feeding. Conclusions: Our findings suggest that NKA?1 is a physiological regulator of glucose homoeostasis and its DR-region is a novel target to treat hepatic insulin resistance.

SUBMITTER: Sun HJ 

PROVIDER: S-EPMC7255017 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature