title: Testosterone metabolism in new squamous cell carcinoma cell line (RSS18) from 7,12-dimethylbenz[a]anthracene-induced submandibular gland of female rat.
abstract: We established a new squamous cell carcinoma cell line, designated RSS18, from a 7,12-dimethyl-benz[a]anthracene (DMBA)-induced submandibular gland of the female rat, and investigated a testosterone metabolism in the cells. During 6 h incubation of RSS18 cells with testosterone as a substrate, the cells produced a significant amount of 5alpha-dihydrotestosterone (DHT) and three kinds of minor metabolites, and their percentages metabolized against total metabolites were in descending order of DHT (89 %) > 5alpha-androstane-3alpha,17beta-diol (9.0 %) > 5alpha-androstanedione(1.6%) > 4-androstene-3,17-dione (0.69%). Therefore, testosterone in RSS18 cells was predominantly converted to DHT by 5alpha-reductase. Growth of RSS18 cells was stimulated by DHT (10(-11)-10(-9) M) to around 170%. By reverse transcription-polymerase chain reaction, the androgen receptor mRNA was significantly detected in RSS18 cells. As a result of these findings, DHT production from testosterone and expression of androgen receptor mRNA, we concluded that RSS18 proliferation may be stimulated by DHT through 5alpha-reductase from testosterone.
authors.affiliation: Department of Biochemistry, Kanagawa Dental College, Yokosuka, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kato
authors.forename: S
authors.initials: S
authors.lastname: Ozono
authors.forename: S
authors.initials: S
authors.lastname: Koshika
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene; D000818:Animals; D001483:Base Sequence; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D002455:Cell Division / Q000187:drug effects; D017931:DNA Primers / Q000737:chemistry; D013196:Dihydrotestosterone / Q000494:pharmacology; D005260:Female; D015870:Gene Expression; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D011916:Rats, Inbred F344; D011944:Receptors, Androgen / Q000378:metabolism; D013363:Submandibular Gland; D013365:Submandibular Gland Neoplasms / Q000378:metabolism*; D013739:Testosterone / Q000378:metabolism*
chemical_list: D017931:DNA Primers; D012333:RNA, Messenger; D011944:Receptors, Androgen; D013196:Dihydrotestosterone; D013739:Testosterone; D015127:9,10-Dimethyl-1,2-benzanthracene