title: Induction of neoplastic transformation in C3H/10T1/2 cells by 2.45-GHz microwaves and phorbol ester.
abstract: C3H/10T1/2 cells were exposed to 2.45-GHz microwaves for 24 h and/or 1.5 Gy of 238-kVp X rays at 3.75 Gy/min. Transformation frequency and cell survival were measured with or without postirradiation addition of the tumor promoter tetradecanoyl-phorbol-13-acetate (TPA) at 0.1 microgram/ml. We previously reported (Carcinogenesis 6,859-864, 1985) an enhancement of transformation frequency when 10T1/2 cells exposed to a special sequence of microwaves and X rays were subsequently cultured in TPA. The same sequence of microwaves and X rays without promotion resulted in a transformation response similar to that induced by X rays alone. We now report statistically significant (at P greater than 0.999) enhancement of transformation response by TPA in cells exposed to 2.45-GHz microwaves (SAR = 4.4 W/kg). Microwaves alone had no effect on transformation. Plating efficiency and cell survival were not affected by TPA or microwave treatments.
authors.affiliation: Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore 21201.
authors.forename: E K
authors.initials: EK
authors.lastname: Balcer-Kubiczek
authors.forename: G H
authors.initials: GH
authors.lastname: Harrison
mesh_terms: D000818:Animals; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D002471:Cell Transformation, Neoplastic / Q000187:drug effects / Q000528:radiation effects; D008872:Microwaves; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D013755:Tetradecanoylphorbol Acetate