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Presence of Senescent and Memory CD8+ Leukocytes as Immunocenescence Markers in Skin Lesions of Elderly Leprosy Patients.

Abstract

Leprosy is an infectious disease that remains endemic in approximately 100 developing countries, where about 200,000 new cases are diagnosed each year. Moreover, multibacillary leprosy, the most contagious form of the disease, has been detected at continuously higher rates among Brazilian elderly people. Due to the so-called immunosenescence, characterized by several alterations in the quality of the immune response during aging, this group is more susceptible to infectious diseases. In view of such data, the purpose of our work was to investigate if age-related alterations in the immune response could influence the pathogenesis of leprosy. As such, we studied 87 individuals, 62 newly diagnosed and untreated leprosy patients distributed according to the age range and to the clinical forms of the disease and 25 healthy volunteers, who were studied as controls. The frequency of senescent and memory CD8 leukocytes was assessed by immunofluorescence of biopsies from cutaneous lesions, while the serum levels of IgG anti-CMV antibodies were analyzed by chemiluminescence and the gene expression of T cell receptors' inhibitors by RT-qPCR. We noted an accumulation of memory CD8 T lymphocytes, as well as reduced CD8CD28 cell expression in skin lesions from elderly patients, when compared to younger people. Alterations in and gene expression in cutaneous lesions of young MB patients were also observed, when compared to elderly patients. Such data suggest that the age-related alterations of T lymphocyte subsets can facilitate the onset of leprosy in elderly patients, not to mention other chronic inflammatory diseases.

More information

Type
Journal Article
Author
da Silva P
de Castro K
Mendes M
Leal-Calvo T
Leal J
Nery J
Sarno E
Lourenço R
Moraes M
Lara F
Esquenazi D
Year of Publication
2021
Journal
Frontiers in immunology
Volume
12
Number of Pages
647385
Date Published
01/2021
Language
eng
ISSN Number
1664-3224
DOI
10.3389/fimmu.2021.647385
Alternate Journal
Front Immunol
PMID
33777045
Publication Language
eng