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Sexual dimorphism in obesity-related genes in the epicardial fat during aging

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Abstract

Aging increases the risk of cardiovascular disease and metabolic syndrome. Alterations in epicardial fat play an important pathophysiological role in coronary artery disease and hypertension. We investigated the impact of normal aging on obesity-related genes in epicardial fat. Sex-specific changes in obesity-related genes with aging in epicardial fat (EF) were determined in young (6 months) and old (30/36 months) female and male, Fischer 344 × Brown Norway hybrid (FBN) rats, using a rat obesity RT2 PCR Array. Circulating sex hormone levels, body and heart weights were determined. Statistical significance was determined using two-tailed Student’s t test and Pearson’s correlation. Our results revealed sex-specific differences in obesity-related genes with aging. Dramatic changes in the expression profile of obesity-related genes in EF with aging in female, but not in male, FBN rats were observed. The older (30 months) female rats had more significant variations in the abundance of obesity-related genes in the EF compared to that seen in younger female rats or both age groups in male rats. A correlation of changes in obesity-related genes in EF to heart weights was observed in female rats, but not in male rats with aging. No correlation was observed to circulating sex hormone levels. Our findings indicate a dysfunctional EF in female rats with aging compared to male rats. These findings, with further functional validation, might help explain the sex differences in cardiovascular risk and mortality associated with aging observed in humans.

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Acknowledgements

The authors acknowledge Dr. Eric Blough for his generosity in sharing tissues from the FBN rats and Jia Fei for his technical help. The authors acknowledge the partial support of funds from National Institutes of Health, HL074239 (NS), 1R15AG051062-01 (NS), and 3P20RR016477-09S2. The funding sources had no direct involvement in any aspect of this manuscript.

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Correspondence to Nalini Santanam.

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Marshall University’s Institutional Animal Care and Use Committee (IACUC) approved all protocols, and the animals were treated in compliance with Marshall University IACUC Committee regulations.

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Kocher, C., Christiansen, M., Martin, S. et al. Sexual dimorphism in obesity-related genes in the epicardial fat during aging. J Physiol Biochem 73, 215–224 (2017). https://doi.org/10.1007/s13105-016-0542-0

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  • DOI: https://doi.org/10.1007/s13105-016-0542-0

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