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Connecting serum IGF-1, body size, and age in the domestic dog

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Abstract

Many investigations in recent years have targeted understanding the genetic and biochemical basis of aging. Collectively, genetic factors and biological mechanisms appear to influence longevity in general and specifically; reduction of the insulin/IGF-1 signaling cascade has extended life span in diverse species. Genetic alteration of mammals for life extension indicates correlation to serum IGF-1 levels in mice, and IGF-1 levels have been demonstrated as a physiological predictor of frailty with aging in man. Longevity and aging data in the dog offer a close measure of the natural multifactorial longevity interactions of genetic influence, IGF-1 signaling, and environmental factors such as exposure, exercise, and lifestyle. The absence of genetic alteration more closely represents the human longevity status, and the unique species structure of the canine facilitates analyses not possible in other species. These investigations aimed to measure serum IGF-1 in numerous purebred and mixed-breed dogs of variable size and longevity in comparison to age, gender, and spay/neuter differences. The primary objective of this investigation was to determine plasma IGF-1 levels in the adult dog, including a wide range of breeds and adult body weight. The sample set includes animals ranging from just a few months of age through 204 months and ranging in size from 5 to 160 lb. Four groups were evaluated for serum IGF-1 levels, including intact and neutered males, and intact and spayed females. IGF-1 loss over time, as a function of age, decreases in all groups with significant differences between males and females. The relationship between IGF-1 and weight differs depending upon spay/neuter status, but there is an overall increase in IGF-1 levels with increasing weight. The data, currently being interrogated further for delineation of IGF-1 receptor variants and sex differences, are being collected longitudinally and explored for longevity associations previously unavailable in non-genetically modified mammals.

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Acknowledgments

The authors would like to extend special thanks to Drs. Jeff Logue and Mark Stickney for their contributions to sample collection pertaining to these studies.

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Authors and Affiliations

  1. Indiana University East, 2325 Chester Blvd, Richmond, IN, 47374, USA

    Kimberly A. Greer

  2. Southern Illinois University School of Medicine, Springfield, IL, USA

    Larry M. Hughes

  3. Department of Surgery, Southern Illinois University School of Medicine, Springfield, IL, 62794, USA

    Michal M. Masternak

  4. Department of Internal Medicine, Southern Illinois University School of Medicine, Springfield, IL, 62794, USA

    Michal M. Masternak

Authors
  1. Kimberly A. Greer
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  2. Larry M. Hughes
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  3. Michal M. Masternak
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Correspondence to Kimberly A. Greer.

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Greer, K.A., Hughes, L.M. & Masternak, M.M. Connecting serum IGF-1, body size, and age in the domestic dog. AGE 33, 475–483 (2011). https://doi.org/10.1007/s11357-010-9182-4

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  • DOI: https://doi.org/10.1007/s11357-010-9182-4

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