Abstract
Natural aging is accompanied by a dysregulation of the host immune response that has well-known clinical consequences but poorly defined underlying causes. It has previously been reported that advancing age is associated with an increase in membrane cholesterol level in T cells. The aim of this study was to investigate whether high-density lipoprotein (HDL) can modulate the age-related accumulation of membrane cholesterol in T cells and impact on their subsequent responsiveness. Our data reveal that cholesterol metabolism, influx, and efflux are altered in T cells with aging, which may in part explain the increase in membrane cholesterol level observed in T cells in elderly individuals. HDL was unable to promote reverse cholesterol transport in T cells from elderly subjects with the same efficiency as was observed in T cells from young subjects besides unchanged ABCA-1 and SR-BI expressions. HDL exhibited a short-acting co-stimulatory effect by enhancing T cell production of interleukin-2 (IL-2). Moreover, HDL from healthy normolipemic individuals exerted differential effects on T cell proliferation that depended on the age of the HDL donor. Finally, HDL modulated TCR/CD28 activation by inducing sustained signaling through pLck, pERK, and pAkt. These data suggest that HDL has immunomodulatory effects on T cells that are influenced by age.
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Acknowledgments
This work was supported by grants from the Canadian Institutes of Health Research (CIHR) (No. 106634 and No. 106701), the Université de Sherbrooke, the Research Center on Aging, and the Agency for Science Technology and Research (A*STAR), Singapore. Anis Larbi is part of the ISAC Scholar program. The manuscript was edited by Neil McCarthy of Insight Editing London.
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The authors declare that they do not have any competing interests.
Author contributions
Conceived and designed the experiments: AL, AK, GD, TF. Performed the experiments: CF, AL, HB. Analyzed the data and wrote the manuscript: TF, AL, GD, AK.
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Larbi, A., Fortin, C., Dupuis, G. et al. Immunomodulatory role of high-density lipoproteins: impact on immunosenescence. AGE 36, 9712 (2014). https://doi.org/10.1007/s11357-014-9712-6
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DOI: https://doi.org/10.1007/s11357-014-9712-6