Abstract:
:CD40 is expressed on basal keratinocytes and Squamous Cell Cancer of the Head and Neck (SCCHN) tumor cells in vivo and in vitro. CD40 ligation reduces proliferation of SCCHN cell lines and enhances EGFr mediated inhibition of proliferation. We investigated the mechanisms of CD40 function and EGFr cross-communication in SCCHN cell lines. CD40 ligation inhibited spontaneous and Fas-induced apoptosis. CD40 ligation specifically increased the secretion of IL-8, VEGF and PGE(2) but not IL-6, IL-10, FasL, GM-CSF, or TGFalpha. Co-ligation with EGFr further increased IL-8, VEGF and PGE(2) secretion. CD40 ligation also induced delayed activation and tyrosine phosphorylation of EGFr. CD40 induces secretion of specific proinflammatory and proangiogenic cytokines, inhibits spontaneous and Fas-induced apoptosis and increases EGFr phosphorylation. CD40 signaling may enhance the survival of SCCHN and tumor stroma.
journal_name
Oral Oncoljournal_title
Oral oncologyauthors
Cao W,Cavacini LA,Tillman KC,Posner MRdoi
10.1016/j.oraloncology.2004.11.005subject
Has Abstractpub_date
2005-05-01 00:00:00pages
462-9issue
5eissn
1368-8375issn
1879-0593pii
S1368-8375(04)00263-5journal_volume
41pub_type
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