The BCKDH Kinase and Phosphatase Integrate BCAA and Lipid Metabolism via Regulation of ATP-Citrate Lyase.

Published

Journal Article

Branched-chain amino acids (BCAA) are strongly associated with dysregulated glucose and lipid metabolism, but the underlying mechanisms are poorly understood. We report that inhibition of the kinase (BDK) or overexpression of the phosphatase (PPM1K) that regulates branched-chain ketoacid dehydrogenase (BCKDH), the committed step of BCAA catabolism, lowers circulating BCAA, reduces hepatic steatosis, and improves glucose tolerance in the absence of weight loss in Zucker fatty rats. Phosphoproteomics analysis identified ATP-citrate lyase (ACL) as an alternate substrate of BDK and PPM1K. Hepatic overexpression of BDK increased ACL phosphorylation and activated de novo lipogenesis. BDK and PPM1K transcript levels were increased and repressed, respectively, in response to fructose feeding or expression of the ChREBP-β transcription factor. These studies identify BDK and PPM1K as a ChREBP-regulated node that integrates BCAA and lipid metabolism. Moreover, manipulation of the BDK:PPM1K ratio relieves key metabolic disease phenotypes in a genetic model of severe obesity.

Full Text

Duke Authors

Cited Authors

  • White, PJ; McGarrah, RW; Grimsrud, PA; Tso, S-C; Yang, W-H; Haldeman, JM; Grenier-Larouche, T; An, J; Lapworth, AL; Astapova, I; Hannou, SA; George, T; Arlotto, M; Olson, LB; Lai, M; Zhang, G-F; Ilkayeva, O; Herman, MA; Wynn, RM; Chuang, DT; Newgard, CB

Published Date

  • June 5, 2018

Published In

Volume / Issue

  • 27 / 6

Start / End Page

  • 1281 - 1293.e7

PubMed ID

  • 29779826

Pubmed Central ID

  • 29779826

Electronic International Standard Serial Number (EISSN)

  • 1932-7420

Digital Object Identifier (DOI)

  • 10.1016/j.cmet.2018.04.015

Language

  • eng

Conference Location

  • United States