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Am J Physiol Endocrinol Metab. 2014 Nov 1;307(9):E773-83. doi: 10.1152/ajpendo.00148.2014. Epub 2014 Aug 26.

Targeting steroid receptor coactivator 1 with antisense oligonucleotides increases insulin-stimulated skeletal muscle glucose uptake in chow-fed and high-fat-fed male rats.

Author information

1
Howard Hughes Medical Institute and Departments of Internal Medicine and.
2
Departments of Internal Medicine and.
3
Departments of Internal Medicine and West Haven Veterans Affairs Medical Center, West Haven, Connecticut;
4
Vascular Biology Institute, Winthrop-University Hospital, Mineola, New York.
5
Isis Pharmaceuticals, Carlsbad, California; and.
6
Departments of Internal Medicine and Cell Biology, Yale School of Medicine, New Haven, Connecticut;
7
Departments of Internal Medicine and West Haven Veterans Affairs Medical Center, West Haven, Connecticut; Varman.Samuel@yale.edu.

Abstract

The steroid receptor coactivator 1 (SRC1) regulates key metabolic pathways, including glucose homeostasis. SRC1(-/-) mice have decreased hepatic expression of gluconeogenic enzymes and a reduction in the rate of endogenous glucose production (EGP). We sought to determine whether decreasing hepatic and adipose SRC1 expression in normal adult rats would alter glucose homeostasis and insulin action. Regular chow-fed and high-fat-fed male Sprage-Dawley rats were treated with an antisense oligonucleotide (ASO) against SRC1 or a control ASO for 4 wk, followed by metabolic assessments. SRC1 ASO did not alter basal EGP or expression of gluconeogenic enzymes. Instead, SRC1 ASO increased insulin-stimulated whole body glucose disposal by ~30%, which was attributable largely to an increase in insulin-stimulated muscle glucose uptake. This was associated with an approximately sevenfold increase in adipose expression of lipocalin-type prostaglandin D2 synthase, a previously reported regulator of insulin sensitivity, and an approximately 70% increase in plasma PGD2 concentration. Muscle insulin signaling, AMPK activation, and tissue perfusion were unchanged. Although GLUT4 content was unchanged, SRC1 ASO increased the cleavage of tether-containing UBX domain for GLUT4, a regulator of GLUT4 translocation. These studies point to a novel role of adipose SRC1 as a regulator of insulin-stimulated muscle glucose uptake.

KEYWORDS:

glucose transporter type 4; insulin resistance; skeletal muscle; white adipose tissue

PMID:
25159329
PMCID:
PMC4216948
DOI:
10.1152/ajpendo.00148.2014
[Indexed for MEDLINE]
Free PMC Article

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