Title

The contribution of visceral fat to improved insulin signaling in Ames dwarf mice

Authors

Authors

V. Menon; X. Zhi; T. Hossain; A. Bartke; A. Spong; A. Gesing;M. M. Masternak

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Aging Cell

Keywords

adiponectin; adipose tissue; Ames dwarf; insulin; obesity; TUMOR-NECROSIS-FACTOR; ADIPOSE-TISSUE; SURGICAL REMOVAL; RESISTANCE; LONGEVITY; ADIPONECTIN; SENSITIVITY; EXPRESSION; OBESITY; GENE; Cell Biology; Geriatrics & Gerontology

Abstract

Ames dwarf (Prop1df, df/df) mice are characterized by growth hormone (GH), prolactin, and thyrotropin deficiency, remarkable extension of longevity and increased insulin sensitivity with low levels of fasting insulin and glucose. Plasma levels of anti-inflammatory adiponectin are increased in df/df mice, while pro-inflammatory IL-6 is decreased in plasma and epididymal fat. This represents an important shift in the balance between pro- and anti-inflammatory adipokines in adipose tissue, which was not exposed to GH signals during development or adult life. To determine the role of adipose tissue in the control of insulin signaling in these long-living mutants, we examined the effects of surgical removal of visceral (epididymal and perinephric) adipose tissue. Comparison of the results obtained in df/df mice and their normal (N) siblings indicated different effects of visceral fat removal (VFR) on insulin sensitivity and glucose tolerance. The analysis of the expression of genes related to insulin signaling indicated that VFR improved insulin action in skeletal muscle in N mice. Interestingly, this surgical intervention did not improve insulin signaling in df/df mice skeletal muscle but caused suppression of the signal in subcutaneous fat. We conclude that altered profile of adipokines secreted by visceral fat of Ames dwarf mice may act as a key contributor to increased insulin sensitivity and extended longevity of these animals.

Journal Title

Aging Cell

Volume

13

Issue/Number

3

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

497

Last Page

506

WOS Identifier

WOS:000337523400012

ISSN

1474-9718

Share

COinS