title: In vitro alterations of tracheal epithelium of hamsters by carcinogens in organ culture.
abstract: In vitro organ culture of the hamster's trachea was improved and applied to a carcinogenesis research. The rotary culture enabled explants of tracheal epithelium to survive more than 8 weeks. The study was composed of 2 kinds of culture; untreated and treated with carcinogens. In the untreated culture, Eagle MEM medium had the same culture effect as RPMI 1640 medium. With prolongation of culture time (particularly longer than 5 weeks), irreversible degenerative changes appeared in epithelial cells. Culture for 4 weeks was usually thought to be appropriate for experimental research. In the treated culture, the effect of benzo-(a) pyrene (B(a)P) and B(a)P + cigarette smoking condensate-neutral fraction (CSC-NF) on tracheal epithelium was investigated with light and electron microscopies (TEM and SEM) and autoradiography. Atypical hyperplasia with or without lesions suggesting carcinoma in situ was induced by B(a)P + CSC-NF more evidently and frequently than by B(a)P alone. The present findings corroborated the cocarcinogenetic effect of CSC-NF.
mesh_terms: D000818:Animals; D001564:Benzo(a)pyrene / Q000633:toxicity; D002273:Carcinogens / Q000633:toxicity*; D003043:Cocarcinogenesis; D006224:Cricetinae; D004848:Epithelium / Q000187:drug effects / Q000473:pathology; D006965:Hyperplasia; D008647:Mesocricetus; D008854:Microscopy, Electron; D009924:Organ Culture Techniques; D010947:Plants, Toxic; D011230:Precancerous Conditions / Q000139:chemically induced / Q000473:pathology; D012906:Smoke / Q000009:adverse effects; D014026:Nicotiana; D014132:Trachea / Q000187:drug effects* / Q000473:pathology; D014134:Tracheal Neoplasms / Q000139:chemically induced / Q000473:pathology
chemical_list: D002273:Carcinogens; D012906:Smoke; D001564:Benzo(a)pyrene