title: N-formyl-Met-Leu-Phe-induced oxidative burst in DMSO-differentiated HL-60 cells requires active Hsp90, but not intact microtubules.
abstract: In this study we examined whether microtubules and heat shock protein 90 (Hsp90) are involved in phorbol myristate acetate (PMA) and N-formyl-Met-Leu-Phe (fMLP)-induced oxidative burst in DMSO-differentiated HL-60 cells. Our results showed that microtubule interfering agents, paclitaxel (1-5 microM), colchicine (1-100 microM), nocodazole (1-20 microM), and vincristine (1-50 microM), did not affect either PMA or fMLP-induced oxidative burst. In contrast, radicicol, an inhibitor of Hsp90, inhibited fMLP-induced oxidative burst in time and concentration-dependent manner where IC50 value for 30 min pre-incubation was 16.5 +/- 3.5 microM radicicol. We conclude that both PMA and fMLP-induced oxidative burst in DMSO-differentiated HL-60 cells is microtubule-independent while the latter requires Hsp90 activity.
authors.affiliation: Institute of Medical Chemistry and Biochemistry, Faculty of Medicine, Palacký University, Hnevotínská 3, 775 15 Olomouc, Czech Republic.
authors.forename: Jirí
authors.initials: J
authors.lastname: Vrba
authors.forename: Martin
authors.initials: M
authors.lastname: Modrianský
mesh_terms: D002454:Cell Differentiation; D003078:Colchicine / Q000494:pharmacology; D004121:Dimethyl Sulfoxide / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D018922:HL-60 Cells; D018841:HSP90 Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D008870:Microtubules / Q000187:drug effects / Q000502:physiology*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology*; D009504:Neutrophils / Q000378:metabolism*; D015739:Nocodazole / Q000494:pharmacology; D017239:Paclitaxel / Q000494:pharmacology; D016897:Respiratory Burst / Q000187:drug effects*
chemical_list: D018841:HSP90 Heat-Shock Proteins; D009240:N-Formylmethionine Leucyl-Phenylalanine; D017239:Paclitaxel; D015739:Nocodazole; D003078:Colchicine; D004121:Dimethyl Sulfoxide