title: Chemical and biological studies of a new cigarette that primarily heats tobacco. Part 3. In vitro toxicity of whole smoke.
abstract: Mainstream smoke from Kentucky reference low "tar" (1R4F) and ultra-low "tar" (1R5F) cigarettes and a test cigarette (TOB-HT), that primarily heats tobacco, was compared for cytotoxic and genotoxic potential using cellular smoke exposure technology (CSET). CSET includes a computer controlled 30-port AMESA/Battelle-Geneva smoke generator which exposes cultured mammalian Chinese hamster ovary cells (CHO) to whole smoke. Cytotoxicity was assessed using the neutral red assay and genotoxicity was assessed using the sister chromatid exchange (SCE) assay. Compared on a per cigarette basis, mainstream smoke from 1R5F and the TOB-HT cigarette was significantly less cytotoxic and genotoxic than the smoke from the 1R4F cigarette. The cytotoxic and genotoxic activity of smoke from the TOB-HT cigarettes was slightly greater than the smoke from the ultra-low "tar" Kentucky 1R5F reference cigarettes. In conclusion, in these assays mainstream whole smoke of the TOB-HT cigarette had slightly greater cytotoxic and genotoxic potential compared with an ultra-low "tar" 1R5F Kentucky reference cigarette and significantly less activity compared with the whole mainstream smoke from a low "tar" 1R4F Kentucky reference cigarette, representative of the US market average cigarette for FTC yields of "tar", CO and nicotine.
authors.affiliation: Environmental and Molecular Toxicology Division, R. J. Reynolds Tobacco Company, Winston-Salem, NC 27102, USA.
authors.forename: D W
authors.initials: DW
authors.lastname: Bombick
authors.forename: P H
authors.initials: PH
authors.lastname: Ayres
authors.forename: K
authors.initials: K
authors.lastname: Putnam
authors.forename: B R
authors.initials: BR
authors.lastname: Bombick
authors.forename: D J
authors.initials: DJ
authors.lastname: Doolittle
mesh_terms: D000818:Animals; D016466:CHO Cells; D002478:Cells, Cultured; D006224:Cricetinae; D017408:Guidelines as Topic; D009152:Mutagenicity Tests; D009499:Neutral Red; D010947:Plants, Toxic; D011358:Product Surveillance, Postmarketing; D012015:Reference Standards; D012854:Sister Chromatid Exchange; D012907:Smoking / Q000639:trends*; D014026:Nicotiana / Q000737:chemistry*; D019460:Tobacco Industry / Q000639:trends*; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*; D014481:United States; D014485:United States Federal Trade Commission / Q000592:standards
chemical_list: D014028:Tobacco Smoke Pollution; D009499:Neutral Red