title: Expression of CD40 and CD40 ligand in Bowen's disease and squamous cell carcinoma.
abstract: CD40 is a member of the tumor necrosis factor receptor super-family expressed by B cells, monocytes, dendritic cells, epithelial cells and hematopoietic progenitor cells. CD40 has recently been reported to be expressed on several epidermal tumors as well. CD40 on epidermal tumor cells interacts with lymphocytes expressing ligand for CD40 (CD40L) or monoclonal antibodies against CD40 with a significant decrease in proliferation. In this study, we examined the expression of CD40 and CD40L in Bowen's disease and squamous cell carcinoma (SCC). CD40 immunoreactivity was observed in a significantly lower proportion of tumor cells from SCC than from Bowen's disease. CD40L mRNA expression was detected in Bowen's disease and SCC by reverse transcriptase polymerase chain reaction (RT-PCR). CD40-CD40L interactions in epidermal tumors may play a role in the proliferation, and the lack of CD40 in tumor cells from SCC might be involved in the mechanisms of escape from the growth inhibitory effect.
authors.affiliation: Department of Dermatology, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara, Kanagawa 228-8555, Japan. amo@med.kitasato-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Amo
authors.forename: Y
authors.initials: Y
authors.lastname: Ohta
authors.forename: Y
authors.initials: Y
authors.lastname: Hamada
authors.forename: M
authors.initials: M
authors.lastname: Tatsuta
authors.forename: K
authors.initials: K
authors.lastname: Katsuoka
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001913:Bowen's Disease / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D019013:CD40 Antigens / Q000235:genetics* / Q000378:metabolism; D023201:CD40 Ligand; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics* / Q000378:metabolism; D008875:Middle Aged; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D019013:CD40 Antigens; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D023201:CD40 Ligand