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Departments of
*
Hematology and Oncology and
Dermatology, Graduate School of Medicine, and
Laboratory of Virus Immunology, Research Center for Acquired Immunodeficiency Syndrome, The Institute for Virus Research, Kyoto University, Kyoto, Japan
We investigated the intracellular signaling events of OX40 ligand (gp34), a member of the TNF family. To elucidate the intracellular signaling via gp34, we prepared a model system in which a human gp34-transfected mouse epithelial cell line was stimulated with a recombinant soluble form of OX40. We demonstrated that OX40 binding resulted in increase in c-jun and c-fos mRNA levels in this transfectant by Northern blot analysis, which was blocked by the pretreatment with anti-gp34 Ab. The studies with various gp34 deletion mutants showed that the cytoplasmic portion including the amino acid sequence 16–21 (RPRFER) was required for the induction of c-jun and c-fos mRNA expression. Furthermore, OX40 binding induced c-jun mRNA expression also in HUVECs, which in our previous study have been shown to express gp34 and interact with activated T cells through the OX40/gp34 pathway. On the other hand, c-fos mRNA was detectable neither in unstimulated HUVECs nor in gp34-stimulated HUVECs. These results indicate that the OX40/gp34 system generates two-way signals and may elicit biological effects on vascular endothelial cells.
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