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. 2001 Apr;92(4):377-82.
doi: 10.1111/j.1349-7006.2001.tb01105.x.

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

N Takasawa  1 , N Ishii, N Higashimura, K Murata, Y Tanaka, M Nakamura, T Sasaki, K Sugamura
Affiliations

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

N Takasawa et al. Jpn J Cancer Res. 2001 Apr.

Abstract

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.

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