PMID: 6969594Nov 1, 1980Paper

Natural cell mediated cytotoxicity in systemic lupus erythematosus: suppression by antilymphocyte antibody

Arthritis and Rheumatism
M GotoY Horiuchi

Abstract

The significantly reduced natural killer (NK) cell activity was demonstrated in the peripheral blood lymphocytes (PBL) from 20 female patients with systemic lupus erythematosus (SLE) when compared with NK activity in the age- and sex-matched controls. The reduced NK activity did not correlate with clinical parameters including daily prednisolone doses, serum CH50, antinuclear antibody titers, and antiDNA activities, circulating immune complex levels, and cytotoxic activities of antilymphocyte antibodies (ALA). The effects of prednisolone and aggregated human IgG on NK activity were only slightly suppressive in the in vitro studies. When normal PBL were pretreated with rabbit complement and SLE sera containing ALA, the NK activity of the surviving cells was markedly decreased. The decrease was specific and did not seem to be due to the physical hindrance of the dead cells. Other heterologous ALA of rabbit origin did not exert a suppressive effect on NK activity. These results suggest that the suppressed NK activity in SLE can be ascribed to an antiNK cell specific antibody in lupus sera, although the participation of circulating immune complexes was not completely excluded.

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