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We previously demonstrated that the induction by staphylococcal toxic shock syndrome toxin 1 (TSST-1) of tumor necrosis factor alpha (TNF-alpha) and interleukin-1 beta (IL-1 beta) secretion by human monocytes requires direct T cell-monocyte contact. In the present study, a role for the adhesion molecule lymphocyte function associated antigen 1 (LFA-1) in TSST-1-induced cytokine secretion by human monocytes among 12 normal healthy donors was investigated. Monoclonal antibodies to the alpha chain (anti-CD11a) and to the beta chain (anti-CD18) of LFA-1 significantly inhibited TSST-1-induced TNF-alpha and IL-1 beta secretion (P &lt; 0.025; Wilcoxon signed-rank test, two tailed), while a control monoclonal antibody directed against the monocyte CD14 antigen had no effect. These results suggest that LFA-1 may play an important role in the secretion of TNF-alpha and IL-1 beta by TSST-1-stimulated human monocytes, likely by promoting cell-cell adhesion between monocytes and lymphocytes.

infection and immunity

Role of the adhesion molecule lymphocyte function associated antigen 1 in toxic shock syndrome toxin 1-induced tumor necrosis factor alpha and interleukin-1 beta secretion by human monocytes