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Comparative Study
. 1999 Feb 1;162(3):1278-86.

Selective expression of a novel surface molecule by human Th2 cells in vivo

K Nagata  1 , K Tanaka, K Ogawa, K Kemmotsu, T Imai, O Yoshie, H Abe, K Tada, M Nakamura, K Sugamura, S Takano
Affiliations
  • PMID: 9973380
Comparative Study

Selective expression of a novel surface molecule by human Th2 cells in vivo

K Nagata et al. J Immunol. .

Abstract

The search for reliable marker molecules discriminating between human Th1 and Th2 cells identified a gene encoding a novel member of the G protein-coupled leukocyte chemoattractant receptor family, which is selectively expressed in Th2 but not Th1 lineage cells, thereby named CRTH2 (chemoattractant receptor-homologous molecule expressed on Th2 cells). Studies with anti-CRTH2 mAbs demonstrated that CRTH2 was expressed in a small population (0.4-6.5%) of CD4+ T cells in fresh PBMCs of healthy adults, but no remarkable expression was seen in B cells and NK cells. In some cases, CD8+ T cells ( approximately 3.5%) expressed CRTH2. Phenotypes of CD4+ T cells expressing CRTH2 were CD45RA-, CD45RO+, and CD25+, similar to those of Ag-activated effector/memory T cells. Freshly isolated CRTH2+ CD4+ T cells produced Th2- but little or no Th1-type cytokines upon stimulation with PMA and ionomycin. In addition, an allergen-induced proliferative response in fresh PBMCs was significantly and selectively reduced by subtracting CRTH2+ cells. Together, these results indicate that CRTH2 is selectively expressed in vivo in an activated state of Th2 cells including allergen-responsive Th2 cells, suggesting its pivotal roles in ongoing Th2-type immune reactions.

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