title: Expression of selectin ligands by cutaneous squamous cell carcinoma.
abstract: Recent evidence suggests that interactions between endothelial selectins and tumor surface selectin ligands may be of importance in cancer metastasis. To investigate the role of such mechanisms in cutaneous tumors, whole skin biopsies were examined immunohistochemically for a variety of selectin ligands including sialyl-Lewis-X, sialyl-Lewis-A (S-Le(a)), sulfatides, and CD15. In 12 of 12 squamous cell carcinomas (SCCs), there was expression of sialyl-Lewis-X and CD15, but no tumor expressed S-Le(a). Occasional keratinocytes in eight of 12 SCCs expressed sulfatides. All selectin ligands were absent on keratinocytes in basal cell carcinomas (BCCs, n = 8) and normal skin (n = 8), with the exception of one BCC that expressed S-Le(a). E-selectin was not present in normal skin, but was strongly expressed by dermal endothelium in both SCC and BCC. Keratinocyte cell lines A431, HaCaT, and SVK14 were investigated by flow cytometry, which demonstrated sialyl-Lewis-X and S-Le(a) expression by all three, whereas normal human keratinocytes did not express these molecules. These findings suggest a potential role for selectin-mediated events in early and late metastasis, and differential expression of these ligands by BCC and SCC may explain the relatively low metastatic potential of the former.
authors.affiliation: Laboratory of Applied Dermatopathology, St. John's Institute of Dermatology, UMDS, Guy's Hospital, London, United Kingdom.
authors.forename: R W
authors.initials: RW
authors.lastname: Groves
authors.forename: M H
authors.initials: MH
authors.lastname: Allen
authors.forename: E L
authors.initials: EL
authors.lastname: Ross
authors.forename: G
authors.initials: G
authors.lastname: Ahsan
authors.forename: J N
authors.initials: JN
authors.lastname: Barker
authors.forename: D M
authors.initials: DM
authors.lastname: MacDonald
mesh_terms: D002280:Basal Cell Carcinoma / Q000378:metabolism; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000378:metabolism*; D002460:Cell Line; D019040:E-Selectin; D005434:Flow Cytometry; D006801:Humans; D007124:Immunoenzyme Techniques; D015603:Keratinocytes / Q000378:metabolism*; D008024:Ligands; D019007:P-Selectin; D010980:Platelet Membrane Glycoproteins / Q000378:metabolism*; D012016:Reference Values; D012867:Skin / Q000378:metabolism; D012878:Skin Neoplasms / Q000378:metabolism*; D013194:Staining and Labeling
chemical_list: D015815:Cell Adhesion Molecules; D019040:E-Selectin; D008024:Ligands; D019007:P-Selectin; D010980:Platelet Membrane Glycoproteins