Islet proteomics reveals genetic variation in dopamine production resulting in altered insulin secretion.

Autor:	Mitok KA; From the Departments of Biochemistry., Freiberger EC; From the Departments of Biochemistry., Schueler KL; From the Departments of Biochemistry., Rabaglia ME; From the Departments of Biochemistry., Stapleton DS; From the Departments of Biochemistry., Kwiecien NW; Chemistry, and., Malec PA; the Department of Chemistry, University of Michigan-Ann Arbor, Ann Arbor, Michigan 48109., Hebert AS; the Genome Center of Wisconsin, University of Wisconsin-Madison, Madison, Wisconsin 53706 and., Broman AT; Biostatistics and Medical Informatics and., Kennedy RT; the Department of Chemistry, University of Michigan-Ann Arbor, Ann Arbor, Michigan 48109., Keller MP; From the Departments of Biochemistry., Coon JJ; Chemistry, and jcoon@chem.wisc.edu.; the Genome Center of Wisconsin, University of Wisconsin-Madison, Madison, Wisconsin 53706 and., Attie AD; From the Departments of Biochemistry, adattie@wisc.edu.
Jazyk:	angličtina
Zdroj:	The Journal of biological chemistry [J Biol Chem] 2018 Apr 20; Vol. 293 (16), pp. 5860-5877. Date of Electronic Publication: 2018 Mar 01.
DOI:	10.1074/jbc.RA117.001102
Abstrakt:	The mouse is a critical model in diabetes research, but most research in mice has been limited to a small number of mouse strains and limited genetic variation. Using the eight founder strains and both sexes of the Collaborative Cross (C57BL/6J (B6), A/J, 129S1/SvImJ (129), NOD/ShiLtJ (NOD), NZO/HILtJ (NZO), PWK/PhJ (PWK), WSB/EiJ (WSB), and CAST/EiJ (CAST)), we investigated the genetic dependence of diabetes-related metabolic phenotypes and insulin secretion. We found that strain background is associated with an extraordinary range in body weight, plasma glucose, insulin, triglycerides, and insulin secretion. Our whole-islet proteomic analysis of the eight mouse strains demonstrates that genetic background exerts a strong influence on the islet proteome that can be linked to the differences in diabetes-related metabolic phenotypes and insulin secretion. We computed protein modules consisting of highly correlated proteins that enrich for biological pathways and provide a searchable database of the islet protein expression profiles. To validate the data resource, we identified tyrosine hydroxylase (Th), a key enzyme in catecholamine synthesis, as a protein that is highly expressed in β-cells of PWK and CAST islets. We show that CAST islets synthesize elevated levels of dopamine, which suppresses insulin secretion. Prior studies, using only the B6 strain, concluded that adult mouse islets do not synthesize l-3,4-dihydroxyphenylalanine (l-DOPA), the product of Th and precursor of dopamine. Thus, the choice of the CAST strain, guided by our islet proteomic survey, was crucial for these discoveries. In summary, we provide a valuable data resource to the research community, and show that proteomic analysis identified a strain-specific pathway by which dopamine synthesized in β-cells inhibits insulin secretion. (© 2018 by The American Society for Biochemistry and Molecular Biology, Inc.)
Databáze:	MEDLINE
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