NKT-like cells reveal higher than T lymphocytes expression of cellular protective proteins HSP70 and SOD2 and comparably increased expression of SIRT1 in the oldest seniors.

Abstract:

INTRODUCTION:NKT-like cells are "non-classical", "CD1d-independent" NKT cells which represent highly differentiated, conventional T lymphocytes coexpressing several NK (natural killer) associated receptors. They are effector lymphocytes of both innate and adaptive immunity and simultaneously regulatory cells of the adaptive immune system. They reveal large granular lymphocyte morphology and can mediate both MHC-restricted and MHC-unrestricted cytotoxicity, secrete many cytokines and modulate Th1 immune responses. The aim of our study was to analyze the expression of proteins involved in cellular stress response: sirtuin 1 (SIRT1), heat shock protein 70 (HSP70) and manganese superoxide dismutase (SOD2) in NKT-like cells compared to T lymphocytes during ageing. MATERIAL AND METHODS:The study involved three groups of participants: the oldest seniors (n = 25; aged over 85; mean age 88 ± 0.5 ys), the old (n = 30; aged under 85; mean age 76 ± 0.9 ys) and the young (n = 32; mean age 21 ± 0.3 ys). Whole blood samples were analyzed by flow cytometry to assess the NKT-like (CD3+CD56+) and T (CD3+) cell populations. RESULTS:The group of the oldest seniors differed from the other age groups by much higher percentage of both NKT-like cells and T lymphocytes expressing SIRT1, HSP70 and SOD2. The expression of these proteins correlated positively with the age of the participants. Interestingly, the significantly higher expression of the studied protective proteins; i.e. HSP70 and SOD2 was found in CD3+CD56+ cells compared to CD3+ lymphocytes and this phenomenon concerned all the studied age groups. These differences were not significant regarding the expression of SIRT1; however, the same tendency was noticeable. CONCLUSIONS:The analysis of CD3+ and CD3+CD56+ lymphocytes showed the increase in the number of NKT-like cells and decreased number of T cells in the process of ageing. The increased expression of cellular protective proteins SIRT1, HSP70 and SOD2 in NKT-like and T-lymphocytes of the oldest seniors seems to correspond to longevity and the observed correlations may suggest the involvement of these proteins in establishing cellular homeostasis specific for healthy ageing. Furthermore, the higher expression of the protective proteins in NKT-like cells compared to T lymphocytes may indicate their particular role in the interplay between innate and adaptive immunity responses during the process of ageing.

authors

Kaszubowska L,Foerster J,Kwiatkowski P,Schetz D

doi

10.5603/FHC.a2018.0025

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

231-240

issue

4

eissn

0239-8508

issn

1897-5631

pii

VM/OJS/J/62315

journal_volume

56

pub_type

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