Distinct roles of prostaglandin H synthases 1 and 2 in T-cell development

Bianca Rocca, Lm Spain, E Puré, R Langenbach, Carlo Patrono, Ga Fitzgerald

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118 Citazioni (Scopus)


Prostaglandin G and H synthases, or cyclooxygenases (COXs), catalyze the formation of prostaglandins (PGs). Whereas COX-1 is diffusely expressed in lymphoid cells in embryonic day 15.5 thymus, COX-2 expression is sparse, apparently limited to stromal cells. By contrast, COX-2 is predominant in a subset of medullary stromal cells in three- to five-week-old mice. The isozymes also differ in their contributions to lymphocyte development. Thus, experiments with selective COX-1 inhibitors in thymic lobes from normal and recombinase-activating gene-1 knockout mice support a role for this isoform in the transition from CD4(-)CD8(-) double-negative (DN) to CD4(+)CD8(+) double-positive (DP). Concordant data were obtained in COX-1 knockouts. Pharmacological inhibition and genetic deletion of COX-2, by contrast, support its role during early thymocyte proliferation and differentiation and, later, during maturation of the CD4 helper T-cell lineage. PGE2, but not other PGs, can rescue the effects of inhibition of either isoform, although it acts through distinct EP receptor subtypes. COX-dependent PG generation may represent a mechanism of thymic stromal support for T-cell development.
Lingua originaleEnglish
pagine (da-a)1469-1477
Numero di pagine9
Stato di pubblicazionePubblicato - 1999


  • Animals
  • Antigens, CD4
  • Antigens, CD8
  • Base Sequence
  • Cell Differentiation
  • Cyclooxygenase 1
  • Cyclooxygenase 2
  • Cyclooxygenase 2 Inhibitors
  • Cyclooxygenase Inhibitors
  • DNA Primers
  • Dinoprostone
  • Gene Expression
  • Genes, RAG-1
  • Isoenzymes
  • Membrane Proteins
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Models, Biological
  • Prostaglandin-Endoperoxide Synthases
  • T-Lymphocytes


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