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The Journal of Immunology, 2000, 165: 4298-4304.
Copyright © 2000 by The American Association of Immunologists

Autoregulation of Human Monocyte-Derived Dendritic Cell Maturation and IL-12 Production by Cyclooxygenase- 2-Mediated Prostanoid Production1

Donna S. Whittaker*, Keith S. Bahjat*, Lyle L. Moldawer{dagger} and Michael J. Clare-Salzler2,*,{dagger}

Departments of * Pathology and {dagger} Surgery, University of Florida, Gainesville, FL 32610

PG added to cell culture profoundly affect the in vitro maturation and function of monocyte-derived dendritic cells (MDC). Because unstimulated monocytes express cyclooxygenase (COX)-1, and COX-2 when activated, we examined whether MDC express these enzymes and produce prostanoids that autoregulate maturation and IL-12 production. Immature MDC (I-MDC) and mature MDC express COX-1, but, unlike monocytes, both MDC populations constitutively express COX-2. However, COX-2 regulation in both MDC populations differs from monocytes, as IL-4 does not suppress enzyme expression. COX-2 is functional in MDC as a specific inhibitor, NS-398, significantly reduces PGE2 production. I-MDC undergoing maturation with soluble CD40 ligand (sCD40L) increase PGE2 synthesis, but prostanoid synthesis is switched to COX-1. However, with IFN-{gamma} present, sCD40L-stimulated PG metabolism is redirected to COX-2, and PGE2 synthesis increases severalfold. Endogenous PG production by MDC does not regulate CD40, CD80, CD86, or HLA DR expression; however, it does promote MDC maturation, as NS-398 significantly reduces CD83 expression in I-MDC matured with sCD40L/IFN-{gamma}. PG produced through COX-2 also autoregulate IL-12, but the effects are dependent on the MDC maturation state. Blocking COX-2 reduces I-MDC secretion of IL-12p40, whereas it increases IL-12p40 and p70 production by maturing MDC. COX-2-mediated PG production impacts MDC function as maturing these cells in the presence of NS-398 yields MDC that stimulate significantly more IFN-{gamma} in an allogeneic mixed lymphocyte response than MDC matured without this inhibitor. These studies demonstrate that MDC express both COX isoforms constitutively and produce prostanoids, which autoregulate their maturation and function.




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