title: Neoplastic transformation of neonatal human fibroblasts exposed in vitro to radiation from a quartz-halogen lamp.
abstract: The use of unfiltered quartz-halogen lamps exposes human skin to radiation that spans much of the ultraviolet (UV) spectrum. Reports indicate that exposure to quartz-halogen lamps is erythemogenic, mutagenic, and carcinogenic. To compare the carcinogenic potential of quartz-halogen lamps with that of other UV sources, we determined the dose dependence for cytotoxicity and neoplastic transformation in neonatal human fibroblasts exposed in vitro to: a 15 W germicidal lamp (primarily 254 nm radiation), a 15 W Cool White fluorescent lamp, and an unfiltered 20 W quartz-halogen lamp. Fluence-survival relationships were multiphasic with linear dose response below about 40% survival, and all three sources produced fluence-dependent transformation as indicated by induction of anchorage-independent growth. Maximum transformation frequencies were observed at fluences of 5-8 J/m2 for the germicidal lamp, 6.3 kJ/m2 for the fluorescent lamp, and 300 J/m2 for the quartz-halogen lamp. These data confirm the carcinogenic potential of the quartz-halogen lamp.
authors.affiliation: National Center for Toxicological Research/FDA, Jefferson, Arkansas 72079, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: West
authors.forename: K L
authors.initials: KL
authors.lastname: Rowland
authors.forename: S A
authors.initials: SA
authors.lastname: Miller
authors.forename: J Z
authors.initials: JZ
authors.lastname: Beer
mesh_terms: D016923:Cell Death / Q000528:radiation effects; D002455:Cell Division / Q000528:radiation effects; D002470:Cell Survival / Q000528:radiation effects; D002471:Cell Transformation, Neoplastic / Q000473:pathology / Q000528:radiation effects*; D002478:Cells, Cultured; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D004890:Erythema / Q000209:etiology; D005347:Fibroblasts / Q000473:pathology / Q000528:radiation effects*; D006801:Humans; D007231:Infant, Newborn; D016296:Mutagenesis / Q000528:radiation effects; D009381:Neoplasms, Radiation-Induced / Q000209:etiology / Q000473:pathology; D014466:Ultraviolet Rays / Q000009:adverse effects*