Aging does not reduce heat shock protein 70 in the absence of chronic insulin resistance

Kylie Kavanagh, Ashley T. Wylie, Tara J. Chavanne, Matthew J. Jorgensen, V. Saroja Voruganti, Anthony G. Comuzzie, Jay R. Kaplan, Charles E. McCall, Stephen B. Kritchevsky

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Heat shock protein (HSP)70 decreases with age. Often aging is associated with coincident insulin resistance and higher blood glucose levels, which also associate with lower HSP70. We aimed to understand how these factors interrelate through a series of experiments using vervet monkeys (Chlorocebus aethiops sabaeous). Monkeys (n = 284, 4-25 years) fed low-fat diets showed no association of muscle HSP70 with age (r =. 04, p =. 53), but levels were highly heritable. Insulin resistance was induced in vervet monkeys with high-fat diets, and muscle biopsies were taken after 0.3 or 6 years. HSP70 levels were significantly greater after 0.3 years (+72%, p <. 05) but were significantly lower following 6 years of high-fat diet (-77%, p <. 05). Associations with glucose also switched from being positive (r =. 44, p =. 03) to strikingly negative (r = -.84, p <. 001) with increasing insulin resistance. In conclusion, a low-fat diet may preserve tissue HSP70 and health with aging, whereas high-fat diets, insulin resistance, and genetic factors may be more important than age for determining HSP70 levels.

Original languageEnglish (US)
Pages (from-to)1014-1021
Number of pages8
JournalJournals of Gerontology - Series A Biological Sciences and Medical Sciences
Volume67 A
Issue number10
DOIs
StatePublished - Oct 2012
Externally publishedYes

Keywords

  • Aging
  • Heat shock protein 70
  • Insulin resistance
  • Nonhuman primate
  • Western diet

ASJC Scopus subject areas

  • Aging
  • Geriatrics and Gerontology

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