Premium
Numerical and functional alterations of circulating γδ T lymphocytes in aged people and centenarians
Author(s) -
Argentati Katy,
Re Francesca,
Donnini Alessia,
Tucci Maria G.,
Franceschi Claudio,
Bartozzi Beatrice,
Bernardini Giovanni,
Provinciali Mauro
Publication year - 2002
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1189/jlb.72.1.65
Subject(s) - immunosenescence , biology , immunology , cytotoxicity , ageing , medicine , in vitro , endocrinology , immune system , genetics
The aim of this study was to evaluate the peripheral representation, in vitro expansion, cytokine production, and cytotoxicity of γδ T lymphocytes from 104 healthy subjects ranging in age from 19 to 103 years. We demonstrated that the absolute number of circulating γδ + T cells was reduced significantly in old people and centenarians in comparison with young subjects as a consequence of the age‐related decreased lymphocyte number. The decrease was a result of an age‐dependent reduction of Vδ2 T cells, whereas the absolute number of Vδ1 T cells was unaffected by age. As a consequence, the Vδ2/Vδ1 ratio was inverted in old subjects and centenarians. A higher percentage of γδ + T cells producing tumor necrosis factor α was found in old donors and centenarians, whereas no age‐related difference was observed in interferon ‐γ production. After a 10‐day in vitro expansion, a twofold lower expansion index of γδ T cells, and particularly of a Vδ2, but not of a Vδ1 subset, was found in old people and centenarians in comparison with young subjects. The cytotoxicity of sorted γδ T cells was preserved in old people and centenarians. The alteration of γδ T cells could contribute to the age‐related derangement of T cell‐mediated, adoptive responses and may represent a new characteristic of immunosenescence.