title: Autocrine regulation of ICAM-1 expression on bladder cancer cell lines: evidence for the role of IL-1 alpha.
abstract: We have studied the autocrine regulation of essential expression of the intercellular adhesion molecule-1 (ICAM-1) on 8 transitional cell carcinoma (TCC) cell lines (histopathological grades 1-3). The constitutive expression of ICAM-1 was regulated by soluble factors in an autocrine fashion. These factors were produced by all cell lines, with the exception of the MGH-U1 cell line. The effects observed could be largely attributed to IL-1 alpha. However, the residual ICAM-1 inducing activity (up to 30% of ICAM-1 induction) could not be associated with any known ICAM-1 inducers (IFN gamma, TNF alpha, TNF beta, IL-1 alpha, IL-1 beta, IL-4, retinoic acid, LPS). In contrast to recombinant derived cytokines, the IL-1 alpha present in tissue culture supernatant was only able to induce ICAM-1 on high-grade tumours and not low-grade cells. This discriminative effect is similar to that noted following in vitro culture of tumour cells with bacillus Calmette-Guerin organisms. Whether the production of soluble factors (e.g., IL-1 alpha) by TCC cell lines plays an essential autocrine role for bladder tumours and/or affects the interaction with cells of the immune system needs to be investigated further.
authors.affiliation: Department of Surgery (WGH), University of Edinburgh Medical School, UK.
authors.forename: A B
authors.initials: AB
authors.lastname: Alexandroff
authors.forename: A M
authors.initials: AM
authors.lastname: Jackson
authors.forename: K
authors.initials: K
authors.lastname: Esuvaranathan
authors.forename: S
authors.initials: S
authors.lastname: Prescott
authors.forename: K
authors.initials: K
authors.lastname: James
mesh_terms: D015703:Antigens, CD / Q000378:metabolism; D002295:Carcinoma, Transitional Cell / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000096:biosynthesis*; D002452:Cell Count; D016207:Cytokines / Q000494:pharmacology; D005434:Flow Cytometry; D006801:Humans; D018799:Intercellular Adhesion Molecule-1; D007375:Interleukin-1 / Q000502:physiology*; D011994:Recombinant Proteins / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D001749:Urinary Bladder Neoplasms / Q000378:metabolism*
chemical_list: D015703:Antigens, CD; D015815:Cell Adhesion Molecules; D016207:Cytokines; D007375:Interleukin-1; D011994:Recombinant Proteins; D018799:Intercellular Adhesion Molecule-1