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Cell Rep. 2017 Jul 11;20(2):451-463. doi: 10.1016/j.celrep.2017.06.048.

Reduced Circulating Insulin Enhances Insulin Sensitivity in Old Mice and Extends Lifespan.

Author information

1
Department of Cellular and Physiological Sciences, Diabetes Research Group, Life Sciences Institute, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
2
Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
3
Department of Biochemistry and Molecular Biology, Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
4
Department of Cellular and Physiological Sciences, Diabetes Research Group, Life Sciences Institute, University of British Columbia, Vancouver, BC V6T 1Z3, Canada. Electronic address: james.d.johnson@ubc.ca.

Abstract

The causal relationships between insulin levels, insulin resistance, and longevity are not fully elucidated. Genetic downregulation of insulin/insulin-like growth factor 1 (Igf1) signaling components can extend invertebrate and mammalian lifespan, but insulin resistance, a natural form of decreased insulin signaling, is associated with greater risk of age-related disease in mammals. We compared Ins2+/- mice to Ins2+/+ littermate controls, on a genetically stable Ins1 null background. Proteomic and transcriptomic analyses of livers from 25-week-old mice suggested potential for healthier aging and altered insulin sensitivity in Ins2+/- mice. Halving Ins2 lowered circulating insulin by 25%-34% in aged female mice, without altering Igf1 or circulating Igf1. Remarkably, decreased insulin led to lower fasting glucose and improved insulin sensitivity in aged mice. Moreover, lowered insulin caused significant lifespan extension, observed across two diverse diets. Our study indicates that elevated insulin contributes to age-dependent insulin resistance and that limiting basal insulin levels can extend lifespan.

KEYWORDS:

aging; hyperinsulinemia; insulin resistance; longevity; metabolism

PMID:
28700945
DOI:
10.1016/j.celrep.2017.06.048
[Indexed for MEDLINE]
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