A branched-chain amino acid metabolite drives vascular fatty acid transport and causes insulin resistance

Fatty acid transport from blood vessels to skeletal muscle, across endothelial cells, is regulated by the branched chain amino acid metabolite 3-hydroxy-isobutyrate. This finding provides a mechanistic explanation for the link between high levels of branched chain amino acids and diabetes. Epidemiol...

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Vydáno v:	Nature medicine Ročník 22; číslo 4; s. 421 - 426
Hlavní autoři:	Jang, Cholsoon, Oh, Sungwhan F, Wada, Shogo, Rowe, Glenn C, Liu, Laura, Chan, Mun Chun, Rhee, James, Hoshino, Atsushi, Kim, Boa, Ibrahim, Ayon, Baca, Luisa G, Kim, Esl, Ghosh, Chandra C, Parikh, Samir M, Jiang, Aihua, Chu, Qingwei, Forman, Daniel E, Lecker, Stewart H, Krishnaiah, Saikumari, Rabinowitz, Joshua D, Weljie, Aalim M, Baur, Joseph A, Kasper, Dennis L, Arany, Zoltan
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York Nature Publishing Group US 01.04.2016 Nature Publishing Group
Témata:	13/1 13/106 13/109 13/44 13/51 13/89 14/19 14/34 14/5 38/39 59 59/5 631/337 631/80/304 64 64/60 692/163/2743/137/773 82 Accumulation Amino acids Amino Acids, Branched-Chain - metabolism Animals Biological transport Biomedicine Cancer Research Development and progression Diabetes Experimental data Fatty acids Fatty Acids - genetics Fatty Acids - metabolism Fluctuations Genetic aspects Health aspects Humans Hydroxybutyrates - metabolism Infectious Diseases Insulin - genetics Insulin - metabolism Insulin resistance Insulin Resistance - genetics letter Lipids Metabolic Diseases Metabolites Mice Mice, Inbred NOD Molecular Medicine Muscle, Skeletal - metabolism Muscle, Skeletal - pathology Neurosciences Obesity - genetics Obesity - metabolism Obesity - pathology Pathogenesis Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha Properties Transcription factors Transcription Factors - biosynthesis Transcription Factors - genetics
ISSN:	1078-8956, 1546-170X, 1546-170X
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Shrnutí:	Fatty acid transport from blood vessels to skeletal muscle, across endothelial cells, is regulated by the branched chain amino acid metabolite 3-hydroxy-isobutyrate. This finding provides a mechanistic explanation for the link between high levels of branched chain amino acids and diabetes. Epidemiological and experimental data implicate branched-chain amino acids (BCAAs) in the development of insulin resistance, but the mechanisms that underlie this link remain unclear 1 , 2 , 3 . Insulin resistance in skeletal muscle stems from the excess accumulation of lipid species 4 , a process that requires blood-borne lipids to initially traverse the blood vessel wall. How this trans-endothelial transport occurs and how it is regulated are not well understood. Here we leveraged PPARGC1a (also known as PGC-1α; encoded by Ppargc1a ), a transcriptional coactivator that regulates broad programs of fatty acid consumption, to identify 3-hydroxyisobutyrate (3-HIB), a catabolic intermediate of the BCAA valine, as a new paracrine regulator of trans-endothelial fatty acid transport. We found that 3-HIB is secreted from muscle cells, activates endothelial fatty acid transport, stimulates muscle fatty acid uptake in vivo and promotes lipid accumulation in muscle, leading to insulin resistance in mice. Conversely, inhibiting the synthesis of 3-HIB in muscle cells blocks the ability of PGC-1α to promote endothelial fatty acid uptake. 3-HIB levels are elevated in muscle from db/db mice with diabetes and from human subjects with diabetes, as compared to those without diabetes. These data unveil a mechanism in which the metabolite 3-HIB, by regulating the trans-endothelial flux of fatty acids, links the regulation of fatty acid flux to BCAA catabolism, providing a mechanistic explanation for how increased BCAA catabolic flux can cause diabetes.
Bibliografie:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	1078-8956 1546-170X 1546-170X
DOI:	10.1038/nm.4057