Cited by 141Genetics, Aging, and Longevity in Model OrganismsAdipose Tissue and MetabolismMitochondrial Function and Pathology

Mitochondrial gene expression and increased oxidative metabolism: Role in increased lifespan of fat-specific insulin receptor knock-out mice

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Katic, Masa, Kennedy, Adam R., Leykin, Igor, Norris, Andrew, McGettrick, Aileen, Gesta, Stephane, Russell, Steven J., Bluher, Matthias +2 more·2007·Aging Cell

Abstract

Caloric restriction, leanness and decreased activity of insulin/insulin-like growth factor 1 (IGF-1) receptor signaling are associated with increased longevity in a wide range of organisms from Caenorhabditis elegans to humans. Fat-specific insulin receptor knock-out (FIRKO) mice represent an interesting dichotomy, with leanness and increased lifespan, despite normal or increased food intake. To determine the mechanisms by which a lack of insulin signaling in adipose tissue might exert this effect, we performed physiological and gene expression studies in FIRKO and control mice as they aged. At the whole body level, FIRKO mice demonstrated an increase in basal metabolic rate and respiratory exchange ratio. Analysis of gene expression in white adipose tissue (WAT) of FIRKO mice from 6 to 36 months of age revealed persistently high expression of the nuclear-encoded mitochondrial genes involved in glycolysis, tricarboxylic acid cycle, beta-oxidation and oxidative phosphorylation as compared to expression of the same genes in WAT from controls that showed a tendency to decline in expression with age. These changes in gene expression were correlated with increased cytochrome c and cytochrome c oxidase subunit IV at the protein level, increased citrate synthase activity, increased expression of peroxisome proliferator-activated receptor gamma coactivator 1alpha (PGC-1alpha) and PGC-1beta, and an increase in mitochondrial DNA in WAT of FIRKO mice. Together, these data suggest that maintenance of mitochondrial activity and metabolic rates in adipose tissue may be important contributors to the increased lifespan of the FIRKO mouse.

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Crossref · 10.1111/j.1474-9726.2007.00346.x

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Authors
Katic, M., Kennedy, A. R., Leykin, I., Norris, A., McGettrick, A., Gesta, S., Russell, S. J., Bluher, M., Maratos‐Flier, E., & Kahn, C. R.
Affiliations
  • Beth Israel Deaconess Medical Center (US)
  • Joslin Diabetes Center (US)
  • University of Iowa (US)
Corresponding author
Kahn, C. Ronald
Venue
Aging Cell
Publisher
Wiley
Published
2007-09-24
Volume
6
Issue
6
Pages
827-839
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W1960692735
Cited by
141
References
73
Citations by year
2026: 3 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 5 · 2021: 10 · 2020: 9 · 2019: 4 · 2018: 2 · 2017: 10 · 2016: 5 · 2015: 14 · 2014: 7 · 2013: 9 · 2012: 11
FWCI
2.69
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (5r01dk069983-05, DK31036)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R37DK031036, R01DK031036, R01DK056113, DK31036, P01DK056116, R01-DK-069983, DK-60837, R01DK060837)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
lifespan extension, mitochondrial gene expression, oxidative metabolism, white adipose tissue, insulin signaling, caloric restriction, aging, PGC-1α, PGC-1β, mitochondrial DNA, cytochrome c, citrate synthase, respiratory exchange ratio, basal metabolic rate, leanness
MeSH terms
Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, Animals, Citrate (si)-Synthase, Citric Acid Cycle, Electron Transport Complex IV, DNA, Mitochondrial, Electron Transport, Glycolysis, Longevity, Mitochondria, Oxidation-Reduction, Receptor, Insulin, Thinness, Transcription Factors, Trans-Activators, Gene Expression, Mice, Knockout, Oligonucleotide Array Sequence Analysis, Cytochromes c, Genes, Mitochondrial, Mice, Adipose Tissue, White

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