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- Title
WNK1 kinase is essential for insulin‐stimulated GLUT4 trafficking in skeletal muscle.
- Authors
Kim, Ji‐Hee; Kim, Hanul; Hwang, Kyu‐Hee; Chang, Jae Seung; Park, Kyu‐Sang; Cha, Seung‐Kuy; Kong, In Deok
- Abstract
With‐no‐lysine 1 (WNK1) kinase is a substrate of the insulin receptor/Akt pathway. Impaired insulin signaling in skeletal muscle disturbs glucose transporter 4 (GLUT4) translocation associated with the onset of type 2 diabetes (T2D). WNK1 is highly expressed in skeletal muscle. However, it is currently unknown how insulin signaling targeting WNK1 regulates GLUT4 trafficking in skeletal muscle, and whether this regulation is perturbed in T2D. Hereby, we show that insulin phosphorylates WNK1 at its activating site via a phosphatidylinositol 3‐kinase‐dependent mechanism. WNK1 promotes the cell surface abundance of GLUT4 via regulating TBC1D4. Of note, we observed insulin resistance and decreased WNK1 phosphorylation in T2D db/db mice as compared to the control mice. These results provide a new perspective on WNK1 function in the pathogenesis of hyperglycemia in T2D. With‐no‐lysine 1 (WNK1) kinase, a substrate of the insulin receptor/Akt pathway, is highly expressed in skeletal muscle. Insulin phosphorylates WNK1 via a PI3K/Akt‐dependent mechanism to promote GLUT4 trafficking via regulating TBC1D4. Type 2 diabetic db/db mice exhibit significant insulin resistance with decreased WNK1 phosphorylation. These results provide a new perspective on WNK1 function in the pathogenesis of hyperglycemia in Type 2 diabetes.
- Subjects
DIABETES; GLUCOSE transporters; INSULIN; SKELETAL muscle; LYSINE
- Publication
FEBS Open Bio, 2018, Vol 8, Issue 11, p1866
- ISSN
2211-5463
- Publication type
Article
- DOI
10.1002/2211-5463.12528