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JCI Insight. 2017 Jul 6;2(13). pii: 89695. doi: 10.1172/jci.insight.89695. [Epub ahead of print]

Independent tissue contributors to obesity-associated insulin resistance.

Author information

1
Department of Internal Medicine, Maastricht University Medical Center, Maastricht, The Netherlands.
2
CARIM School for Cardiovascular Diseases, Maastricht, The Netherlands.
3
Top Institute of Food and Nutrition (TIFN), Wageningen, The Netherlands.
4
Department of Radiology and Nuclear Medicine, Maastricht University Medical Center, Maastricht, The Netherlands.
5
School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht, The Netherlands.
6
Department of Human Biology, Maastricht University Medical Center, Maastricht, The Netherlands.
7
Departments of Medicine, Pediatrics, and Pharmacology, University of Virginia School of Medicine, Charlottesville, Virginia, USA.

Abstract

BACKGROUND:

Induction of insulin resistance is a key pathway through which obesity increases risk of type 2 diabetes, hypertension, dyslipidemia, and cardiovascular events. Although the detrimental effects of obesity on insulin sensitivity are incompletely understood, accumulation of visceral, subcutaneous, and liver fat and impairment of insulin-induced muscle microvascular recruitment (MVR) may be involved. As these phenotypic changes often coincide in obesity, we aimed to unravel whether they independently contribute to insulin resistance and thus constitute separate targets for intervention.

METHODS:

We measured visceral (VAT) and subcutaneous adipose tissue (SAT) volumes and intrahepatic lipid (IHL) content by MRI, and whole body glucose disposal (WBGD) and MVR (using contrast-enhanced ultrasound) responses to a euglycemic insulin clamp in lean (n = 25) and abdominally obese men (n = 52). Abdominally obese men were randomized to dietary weight loss intervention or habitual diet.

RESULTS:

Obesity-associated increases in VAT, SAT, and IHL, along with the decrease in MVR, contributed independently to insulin resistance. Moreover, a dietary weight loss intervention reduced insulin resistance, and mediation analyses showed that decreased IHL and insulin-induced MVR, but not decreased VAT or SAT volumes, independently contributed to improved insulin resistance seen with weight loss.

CONCLUSION:

Quantifying the mutually independent contributions of visceral and subcutaneous adipose tissue, intrahepatic lipid, and insulin-induced muscle microvascular recruitment reveals distinct targets for treating obesity-associated insulin resistance.

TRIAL REGISTRATION:

Clinicaltrials.gov NCT01675401.

FUNDING:

Funding was from the Top Institute Food and Nutrition.

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