Abstract
Adapting to stress, including cold environmental temperature (eT), is crucial for the survival of mammals, especially small rodents. Long-lived mutant mice have enhanced stress resistance against oxidative and non-oxidative challenges. However, much less is known about the response of those long-lived mice to cold stress. Growth hormone receptor knockout (GHR-KO) mice are long-lived with reduced growth hormone signaling. We wanted to test whether GHR-KO mice have enhanced resistance to cold stress. To examine the response of GHR-KO mice to cold eT, GHR-KO mice were housed at mild cold eT (16 °C) immediately following weaning. Longevity results showed that female GHR-KO and wild-type (WT) mice retained similar lifespan, while both male GHR-KO and WT mice had shortened lifespan compared to the mice housed at 23 °C eT. Female GHR-KO and WT mice housed at 16 °C had upregulated fibroblast growth factor 21 (FGF21), enhanced energy metabolism, reduced plasma triglycerides, and increased mRNA expression of some xenobiotic enzymes compared to females housed at 23 °C and male GHR-KO and WT mice housed under the same condition. In contrast, male GHR-KO and WT mice housed at 16 °C showed deleterious effects in parameters which might be associated with their shortened longevity compared to male GHR-KO and WT mice housed at 23 °C. Together, this study suggests that in response to mild cold stress, sex plays a pivotal role in the regulation of longevity, and female GHR-KO and WT mice are more resistant to this challenge than the males.
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Acknowledgements
We would like to thank Dr. John J. Kopchick for providing animals to start our colonies and Lisa Hensley for editorial assistance.
Funding
This work was supported by the National Institutes of Health NIA R01-AG057767 (YF, SM, KNH, ERH) and NIA R01-AG061937 (YF, SM, ERH, KNH, AB), Dale and Deborah Smith Center for Alzheimer’s Research and Treatment, Kenneth Stark Endowment (YF, SM, KNH, ERH), NIA R21-AG062985, American Diabetes Association 1–19-IBS-126 (DM, RS, AB), AG031736 and AG051869 (AB).
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Fang, Y., Medina, D., Stockwell, R. et al. Resistance to mild cold stress is greater in both wild-type and long-lived GHR-KO female mice. GeroScience 45, 1081–1093 (2023). https://doi.org/10.1007/s11357-022-00706-0
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DOI: https://doi.org/10.1007/s11357-022-00706-0