title: Expression of heat shock protein 90 at the cell surface in human neuroblastoma cells.
abstract: In addition to the activity of heat shock protein 90 (Hsp90/HSPC) as a chaperone, some recent studies have reported expression of Hsp90 at the cell surface in certain types of cancer and nervous system cells. We study the expression of Hsp90 at the cell surface in human neuroblastoma (NB69) cells. Immunofluorescence experiments labeling with anti-Hsp90 antibodies on both nonpermeabilized cells and live cells detected Hsp90 at the cell surface. Hsp90 was also identified in a membrane fraction from subcellular fractionation. Cell-surface Hsp90 was significantly more expressed in undifferentiated proliferative spherical neuroblastoma cells than in differentiated flattened cells. In addition, spherical cells were significantly more sensitive to Hsp90 inhibitor 17-allylamino-17-demethoxygeldanamycin compared to flattened cells. This paper describes the first evidence of cell-surface Hsp90 expression in a cancer cell line from nervous tissue and may indicate a novel target for anti-tumoral agents.
authors.affiliation: Center for Astrobiology, CSIC-INTA, Torrejón de Ardoz, Spain.
authors.forename: Cristina
authors.initials: C
authors.lastname: Cid
authors.forename: Ignacio
authors.initials: I
authors.lastname: Regidor
authors.forename: Pedro D
authors.initials: PD
authors.lastname: Poveda
authors.forename: Alberto
authors.initials: A
authors.lastname: Alcazar
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D016227:Benzoquinones / Q000494:pharmacology; D016923:Cell Death / Q000187:drug effects; D045744:Cell Line, Tumor; D002462:Cell Membrane / Q000378:metabolism*; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism*; D006801:Humans; D047029:Lactams, Macrocyclic / Q000494:pharmacology; D009447:Neuroblastoma / Q000378:metabolism* / Q000473:pathology
chemical_list: D000970:Antineoplastic Agents; D016227:Benzoquinones; D018841:HSP90 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; C112765:tanespimycin
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