title: Retinoic acid induces intercellular adhesion molecule-1 hyperexpression in human thyroid carcinoma cell lines.
abstract: The expression of intercellular adhesion molecule-1 (ICAM-1) in tumoral tissues may promote their interaction with the immune system and cytotoxic effect on tumoral cells. This observation led to the investigation of ICAM-1 expression and modulation in different tumoral cell systems in vitro. Recently, retinoic acid-responsive elements have been found in the 5'-regulatory region of the human ICAM-1 gene. In the present study, we investigated, by flow cytometry, the effect of retinoic acid on the surface expression of ICAM-1 in human thyroid carcinoma cell lines. Two papillary (NPA and TPC-1), one follicular (WRO), one anaplastic (ARO) and one immortalized fetal (TAD-2) cell line have been studied. All of them produced constitutively ICAM-1; its surface expression and specific messenger ribonucleic acid (mRNA) levels were increased significantly by retinoic acid in all except the WRO cell line. ICAM-1 hyperexpression by retinoic acid was time dependent, reversible, and dependent on mRNA and protein synthesis. Furthermore, cytokines, such as interferon-gamma and tumor necrosis factor-alpha, both individually and, to a greater extent, in combination with retinoic acid, increased ICAM-1 surface expression and its mRNA levels. In conclusion, retinoic acid is able to induce ICAM-1 up-regulation via mRNA accumulation in human thyroid carcinoma cell lines.
authors.affiliation: Dipartimento di Endocrinologia ed Oncologia Molecolare e Clinica, Università di Medicina e Chirurgia Federico II, Naples, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Bassi
authors.forename: M
authors.initials: M
authors.lastname: Vitale
authors.forename: A
authors.initials: A
authors.lastname: Feliciello
authors.forename: S
authors.initials: S
authors.lastname: De Riu
authors.forename: G
authors.initials: G
authors.lastname: Rossi
authors.forename: G
authors.initials: G
authors.lastname: Fenzi
mesh_terms: D015152:Blotting, Northern; D015815:Cell Adhesion Molecules / Q000378:metabolism; D003513:Cycloheximide / Q000494:pharmacology; D016207:Cytokines / Q000494:pharmacology; D003609:Dactinomycin / Q000494:pharmacology; D006684:HLA-DR Antigens / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000378:metabolism; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism*; D013964:Thyroid Neoplasms / Q000378:metabolism* / Q000473:pathology; D014212:Tretinoin / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D015815:Cell Adhesion Molecules; D016207:Cytokines; D006684:HLA-DR Antigens; D015395:Histocompatibility Antigens Class I; D018799:Intercellular Adhesion Molecule-1; D003609:Dactinomycin; D014212:Tretinoin; D003513:Cycloheximide