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Expression of gp34 (OX40 ligand) and OX40 on human T cell clones

Japanese Journal of Cancer Research, ISSN: 0910-5050, Vol: 92, Issue: 4, Page: 377-382
2001
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Article Description

gp34, Which we previously cloned, is a ligand of OX40 (CD134), a costimulatory molecule involved in T cell activation. To elucidate the role of human OX40/OX40L interaction, we examined the expression of gp34 (OX40L) and OX40 in normal human hematopoietic cells by using flow cytometry. OX40 expression is observed on activated T cells, while OX40L is expressed in antigen-presenting cells. However, cytotoxic T lymphocyte (CTL) clones specific for Epstein-Barr virus (EBV)-transformed autologous lymphoblastic cell lines (LCLs) induced both OX40 and OX40L expression after antigen or T cell receptor (TCR) stimulation. This study suggests a possible function of OX40L/OX40, through T cell-T cell interaction, in the reactivation of memory T cells in an autocrine manner, with implications for the pathogenesis of viral infections and neoplasms.

Bibliographic Details

Naruhiko Takasawa; Naoto Ishii; Norikazu Higashimura; Kazuko Murata; Kazuo Sugamura; Takeshi Sasaki; Yuetsu Tanaka; Masataka Nakamura

Wiley

Medicine; Biochemistry, Genetics and Molecular Biology

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