title: Effect of epinephrine and combination treatment of epinephrine and heat on melanoma cell lines. Study of cytotoxicity and kinetics of 72-kD stress protein.
abstract: To elucidate the effect of epinephrine and the combination with heat on malignant cells, using two melanoma cell lines, HM6KO and G361, we have examined the cytotoxicity and induction of 72-kD stress protein (HSP72) after the treatments. After epinephrine treatment, in both cell lines, cell survival rates decreased gradually in a concentration-dependent manner. After the combination treatment, cell survival rates decreased more than those when two treatments were done separately. The cytotoxicity of epinephrine was more enhanced in G361 than in HM6KO by heat. After epinephrine treatment, in both cell lines, the level of HSP72 did not elevate. After combination treatment, in HM6KO, the level of HSP72 were higher than those of heat alone. In G361, the kinetics of HSP72 level was similar to that of heat alone. These results suggest that epinephrine has a cytotoxicity to melanoma cells and the cytotoxicity is enhanced by the combination. In addition, it is probable that epinephrine does not have HSP72 inducibility in HM6KO and G361, and the different kinetics of HSP72 between the cell lines in the combination treatment may play an important role to determine the degree of enhancement.
authors.affiliation: Division of Plastic Surgery, Nara Medical University, Kashihara City, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hatoko
authors.forename: A
authors.initials: A
authors.lastname: Tanaka
authors.forename: M
authors.initials: M
authors.lastname: Kuwahara
authors.forename: H
authors.initials: H
authors.lastname: Tada
authors.forename: T
authors.initials: T
authors.lastname: Ohnishi
authors.forename: T
authors.initials: T
authors.lastname: Muramatsu
mesh_terms: D000322:Adrenergic Agonists / Q000008:administration & dosage / Q000633:toxicity*; D017209:Apoptosis / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D003131:Combined Modality Therapy; D004305:Dose-Response Relationship, Drug; D004837:Epinephrine / Q000008:administration & dosage / Q000633:toxicity*; D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000187:drug effects* / Q000378:metabolism; D006358:Hot Temperature; D006801:Humans; D007700:Kinetics; D008545:Melanoma / Q000378:metabolism* / Q000473:pathology / Q000628:therapy; D012878:Skin Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000628:therapy; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000322:Adrenergic Agonists; D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D004837:Epinephrine