Down-regulation of natural killer cells and of g/d T cells in systemic lupus erythematosus. Does it correlate to autoimmunity and to laboratory indices of disease activity?

Abstract

A depletion of natural killer (NK) cells seems to play a role in the course of systemic lupus erythematosus (SLE) whereas the possible involvement in this disease of T cell receptor (TCR) g/d positive T cells is still debated.

The aim of this study was to evaluate the peripheral blood mononuclear cells (PBMCs) that express NK surface markers CD16 and CD56 or g/d TCR antigen in 58 SLE patients, investigating the possible role of these cell subsets involved in non-MHC-restricted cytotoxicity and their relationship with the main clinical and laboratory parameters.

SLE patients had, with respect to controls, considerably decreased values of NK cells (P < 0.0004 in percentage and P < 0.00004 as absolute number), of non-MHC-restricted T cytotoxic lymphocytes (P < 0.007 and P < 0.0015, respectively) and of T cells expressing g/d TCR (P < 0.02 and P < 0.004, respectively). The absolute numbers of these cell subsets positively correlated to each other (P < 0.009). g/d T cells inversely correlated with higher ESR values, both percentually (P < 0.006; r ‘ 70.367) and in absolute number (P < 0.009; r ‘ 70.350). Moreover, the percentage values of this cell subset inversely correlated with higher levels of CRP (P < 0.05; r ‘ 70.256) while SLE patients with anti-SSB/La antibodies had lower values of T lymphocytes bearing g/d TCR, both as percentage (P < 0.008) and as absolute number (P < 0.02).

Our study indicates that non-MHC-restricted cytotoxicity, shared by NK, NK-like and g/d T cells, may be down-regulated in SLE patients, owing to a significant reduction of these PBMC subsets. These specific cell subset impairments seem to affect only some aspects of the disease, suggesting a weakening of the regulatory properties of these cells in the control of different immunological and inflammatory features of SLE, that could be of importance in its clinical expression.

Keywords

autoimmunity systemic lupus erythematosus laboratory parameters natural killer cells g/d T cells

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