Abstract
Background
Dendritic cells (DCs) are the most potent antigen-presenting cells, playing a key role in induction of both innate and adaptive immunity. Immunosenescence refers to age-associated changes in the immune system, which may be associated with susceptibility to infections and their clinical complications. The precise effects of aging on DCs in immunity to infections are not well understood. Among the common pathogenic microorganisms, the fungus Candida albicans is an important pathogen for the development of invasive infections, especially in immunocompromised individuals, as well as during aging.
Aims
To make a comparative in vitro evaluation of the immunomodulatory function of DCs challenged with C. albicans, by phagocytosis of the fungal cells, and determine the involvement of TLR2 and TLR4 receptors. For this purpose, DCs were generated with the use of peripheral blood monocytes from healthy young and aged subjects.
Results
The phagocytosis of C. albicans is developed by DCs in TLR2- and TLR4-dependent way. This mechanism is not affected by aging.
Conclusion
Given the important role of the DCs in responses against the fungus, it is evident that if changes in phagocytosis occurred with aging, impairment in the elderly could develop. However, the evidence that phagocytosis of this fungus by DCs is not impaired with aging, brings us to the question of which are the mechanisms truly associated with the prevalence of certain diseases in the elderly.
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Acknowledgments
This study was supported by grants from FAPESP (São Paulo Research Foundation—process numbers 09/17889-5 and 10/15271-1).
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The authors have no financial conflict of interests.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Bauru School of Dentistry and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the author.
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Informed consent was obtained from all individual participants included in the study.
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do Nascimento, M.P.P., Pinke, K.H., Penitenti, M. et al. Aging does not affect the ability of human monocyte-derived dendritic cells to phagocytose Candida albicans . Aging Clin Exp Res 27, 785–789 (2015). https://doi.org/10.1007/s40520-015-0344-1
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DOI: https://doi.org/10.1007/s40520-015-0344-1