Probing the Relationship Between Insulin Sensitivity and Longevity Using Genetically Modified Mice

Overview

Journal J Gerontol A Biol Sci Med Sci

Specialty Geriatrics

Date 2012 Oct 24

PMID 23089336

Citations 21

Authors

James F Nelson

Randy Strong

Alex Bokov

Vivian Diaz

Walter Ward

Affiliations

Soon will be listed here.

Abstract

Interference in insulin and/or insulin-like growth factor 1 (IGF-1) signaling can extend invertebrate life span, and interference in IGF-1 signaling can extend murine life span. Whether interference with murine insulin signaling, which can be diabetogenic and pathological, is also life-extending is controversial. We therefore measured life span in 3 murine strains genetically modified to reduce or increase insulin sensitivity. Mice with reduced insulin sensitivity were hemizygous for a null mutation in the insulin receptor (insulin receptor knockout mice; IRKO(+/-)). Mice with increased insulin sensitivity either had a null mutation of protein tyrosine phosphatase 1B (PTP-1B(-/-)) or overexpressed Peroxisome proliferator-activated receptor-α coactivator (PGC)-1α (PGC-1α(TG)). Life span of insulin insensitive IRKO(+/) mice was increased (males) or unaffected (females). Life spans of mice with increased insulin sensitivity were shortened overall (PTP-1B(-/-) mice) or partially (PGC-1α(TG): survival at the 25th percentile was reduced). These results show that insulin sensitivity in some murine genotypes is inversely related to longevity and provide further evidence for evolutionary conservation of this pathway as a modulator of longevity.

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