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Aging (Albany NY). 2015 Dec;7(12):1086-93.

Prevention of diet-induced hepatic steatosis and hepatic insulin resistance by second generation antisense oligonucleotides targeted to the longevity gene mIndy (Slc13a5).

Author information

1
Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA.
2
Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT, USA.
3
Department of Sport Science, Medical Section, University of Innsbruck, Innsbruck, Austria.
4
Department of Visceral, Transplant, and Thoracic Surgery, D. Swarovski Research Laboratory, Medical University of Innsbruck, Innsbruck, Austria.
5
Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich-Heine University Düsseldorf, German Center for Diabetes Research, Partner Düsseldorf, Düsseldorf, Germany.
6
Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT, USA.
7
Charité - University School of Medicine, Department of Endocrinology, Diabetes and Nutrition, Berlin, Germany.
8
Section of Metabolic Vascular Medicine, Medical Clinic III and Paul Langerhans Institute Dresden (PLID), TU Dresden, Germany.
9
German Center for Diabetes Research (DZD), Dresden, Germany.
10
Isis Pharmaceuticals, Carlsbad, CA, USA.
11
Section of Diabetes and Nutritional Sciences, Rayne Institute, King's College London, London, UK.
12
University Clinic Erlangen, Erlangen, Germany.
13
Veterans Affairs Medical Center, West Haven, CT, USA.

Abstract

Reducing the expression of the Indy (I'm Not Dead Yet) gene in lower organisms extends life span by mechanisms resembling caloric restriction. Similarly, deletion of the mammalian homolog, mIndy (Slc13a5), encoding for a plasma membrane tricarboxylate transporter, protects from aging- and diet-induced adiposity and insulin resistance in mice. The organ specific contribution to this phenotype is unknown. We examined the impact of selective inducible hepatic knockdown of mIndy on whole body lipid and glucose metabolism using 2'-O-methoxyethyl chimeric anti-sense oligonucleotides (ASOs) in high-fat fed rats. 4-week treatment with 2'-O-methoxyethyl chimeric ASO reduced mIndy mRNA expression by 91% (P=0.001) compared to control ASO. Besides similar body weights between both groups, mIndy-ASO treatment lead to a 74% reduction in fasting plasma insulin concentrations as well as a 35% reduction in plasma triglycerides. Moreover, hepatic triglyceride content was significantly reduced by the knockdown of mIndy, likely mediating a trend to decreased basal rates of endogenous glucose production as well as an increased suppression of hepatic glucose production by 25% during a hyperinsulinemic-euglycemic clamp. Together, these data suggest that inducible liver-selective reduction of mIndy in rats is able to ameliorate hepatic steatosis and insulin resistance, conditions occurring with high calorie diets and during aging.

KEYWORDS:

Indy; Slc13a5; aging; hepatic insulin resistance; type 2 diabetes

PMID:
26647160
PMCID:
PMC4712334
DOI:
10.18632/aging.100854
[Indexed for MEDLINE]
Free PMC Article

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