CD40-CD40 ligand (CD154) engagement is required but may not be sufficient for human T helper 1 cell induction of interleukin-2- or interleukin-15-driven, contact-dependent, interleukin-1beta production by monocytes.
[en] To investigate whether antigen-independent, interleukin-2 (IL-2) or IL-15 activation of polarized T helper (Th) cells would result in contact-dependent activation of monocytes, living Th1 and Th2 cell clones were co-cultured with THP-1 cells or fresh peripheral blood monocytes. Under these conditions IL-1beta production was induced almost exclusively by Th1 cells and was dependent on the presence and dose of IL-2 or IL-15, and on cell-cell contact, as demonstrated by double-chamber cultures. Low levels of IL-1 receptor antagonist (IL-1Ra) were induced by Th1 and higher levels by Th2 cells. IL-10 production was similar in Th1/monocyte and Th2/monocyte co-cultures, thus arguing against preferential down-regulation of IL-1beta production by anti-inflammatory IL-10 in Th2 co-cultures. In addition, IL-4 and IL-10 neutralization did not result in enhanced IL-1beta production in Th2/monocyte co-cultures. Preferential expression on Th1 cells of CD11b correlated with their capacity to induce IL-1beta production by THP-1 cells in the presence of IL-2 or IL-15, but anti-CD11b monoclonal antibody could not inhibit this activity. Blockade of the CD40-CD40 ligand interaction resulted in inhibition of IL-1beta-inducing capacity while IL-1Ra induction was unaffected, a result previously unknown. This differential effect indicates the selective relevance of CD40-CD40 ligand engagement in inflammatory monocyte responses upon activation by T cells. CD40 ligand expression levels did not differ in Th1 and Th2 cell clones, thus indicating that additional, unidentified molecule(s) preferentially expressed by Th1 cells are involved in their IL-1beta induction capacity.
Disciplines :
Immunology & infectious disease
Author, co-author :
RIBBENS, Clio ; Université de Liège - ULiège > Département des sciences cliniques > Rhumatologie ; Division of Immunology and Allergy, Department of Internal Medicine, University Hospital, Geneva, Switzerland
Dayer, J M; Division of Immunology and Allergy, Department of Internal Medicine, University Hospital, Geneva, Switzerland
Chizzolini, C; Division of Immunology and Allergy, Department of Internal Medicine, University Hospital, Geneva, Switzerland ; Division of Immunology and Allergy, University Hospital, CH-1211 Geneva 14, Switzerland
Language :
English
Title :
CD40-CD40 ligand (CD154) engagement is required but may not be sufficient for human T helper 1 cell induction of interleukin-2- or interleukin-15-driven, contact-dependent, interleukin-1beta production by monocytes.
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