• Open Access

Fat maintenance is a predictor of the murine lifespan response to dietary restriction

Authors

  • Chen-Yu Liao,

    1. Department of Physiology, University of Texas Health Science Center, San Antonio, TX 78229, USA
    2. Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center, San Antonio, TX 78245, USA
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  • Brad A. Rikke,

    1. Institute for Behavioral Genetics, University of Colorado, Boulder, CO 80309, USA
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  • Thomas E. Johnson,

    1. Institute for Behavioral Genetics, University of Colorado, Boulder, CO 80309, USA
    2. Department of Integrative Physiology, University of Colorado, Boulder, CO 80309, USA
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  • Jonathan A. L. Gelfond,

    1. Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center, San Antonio, TX 78245, USA
    2. Department of Epidemiology and Biostatistics, University of Texas Health Science Center, San Antonio, TX 78229, USA
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  • Vivian Diaz,

    1. Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center, San Antonio, TX 78245, USA
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  • James F. Nelson

    1. Department of Physiology, University of Texas Health Science Center, San Antonio, TX 78229, USA
    2. Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center, San Antonio, TX 78245, USA
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James F. Nelson, Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center, 15355 Lambda Drive, San Antonio, TX 78245, USA. Tel.: +210 562 6132; fax: +210 562 6130; e-mail:nelsonj@uthscsa.edu

Summary

Dietary restriction (DR), one of the most robust life-extending manipulations, is usually associated with reduced adiposity. This reduction is hypothesized to be important in the life-extending effect of DR, because excess adiposity is associated with metabolic and age-related disease. Previously, we described remarkable variation in the lifespan response of 41 recombinant inbred strains of mice to DR, ranging from life extension to life shortening. Here, we used this variation to determine the relationship of lifespan modulation under DR to fat loss. Across strains, DR life extension correlated inversely with fat reduction, measured at midlife (males, = −0.41, < 0.05, = 38 strains; females, = −0.63, < 0.001, = 33 strains) and later ages. Thus, strains with the least reduction in fat were more likely to show life extension, and those with the greatest reduction were more likely to have shortened lifespan. We identified two significant quantitative trait loci (QTLs) affecting fat mass under DR in males but none for lifespan, precluding the confirmation of these loci as coordinate modulators of adiposity and longevity. Our data also provide evidence for a QTL previously shown to affect fuel efficiency under DR. In summary, the data do not support an important role for fat reduction in life extension by DR. They suggest instead that factors associated with maintaining adiposity are important for survival and life extension under DR.

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