Abstract
Aging is associated with progressive loss of cellular homeostasis resulting from intrinsic and extrinsic challenges. Lack of a carefully designed, well-characterized, precise, translational experimental model is a major limitation to understanding the cellular perturbations that characterize aging. Here, we tested the feasibility of primary fibroblasts isolated from nonhuman primates (baboons) as a model of cellular resilience in response to homeostatic challenge. Using a real-time live-cell imaging system, we precisely defined a protocol for testing effects of prooxidant compounds (e.g., hydrogen peroxide (H2O2), paraquat), thapsigargin, dexamethasone, and a low glucose environment on cell proliferation in fibroblasts derived from baboons across the life course (n = 11/sex). Linear regression analysis indicated that donor age significantly reduced the ability of cells to proliferate following exposure to H2O2 (50 and 100 µM) and paraquat (100 and 200 µM) challenges in cells from males (6.4–21.3 years; average lifespan 21 years) but not cells from females (4.3–15.9 years). Inhibitory effects of thapsigargin on cell proliferation were dependent on challenge duration (2 vs 24 h) and concentration (0.1 and 1 µM). Cells from older females (14.4–15.9 years) exhibited greater resilience to thapsigargin (1 µM; 24 h) and dexamethasone (500 µM) challenges than did those from younger females (4.3–6.7 years). The cell proliferation response to low glucose (1 mM) was reduced with age in both sexes. These data indicate that donor’s chronological age and sex are important variables in determining fibroblast responses to metabolite and other challenges.
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Funding
This research was funded in part by R01 AG050797 and R01 AG057431 (ABS) and the Geriatric Research, Education and Clinical Center of the South Texas Veterans Health Care System. This material is the result of work supported with resources and the use of facilities at South Texas Veterans Health Care System, San Antonio, Texas. The contents do not represent the views of the U.S. Department of Veterans Affairs or the United States Government. Baboons in this study were maintained under 1U19AG057758-01A1 (PWN). The authors acknowledge the administrative and technical support of Karen Moore and Yuhong Liu. We also acknowledge support from the SNPRC which is funded by P51 OD011133.
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Adekunbi, D.A., Li, C., Nathanielsz, P.W. et al. Age and sex modify cellular proliferation responses to oxidative stress and glucocorticoid challenges in baboon cells. GeroScience 43, 2067–2085 (2021). https://doi.org/10.1007/s11357-021-00395-1
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DOI: https://doi.org/10.1007/s11357-021-00395-1