title: Comparative analysis of gene expression between renal cortex and papilla in nedaplatin-induced nephrotoxicity in rats.
abstract: To elucidate the mechanism of nephrotoxicity caused by anti-neoplastic platinum complex, nedaplatin (NDP), treatment with a particular focus on the renal papillary toxicity, we analysed the gene expression profiles of two renal regions, the cortex (RC) and the papilla (RP) in rat kidneys. Male Wistar rats received a single administration of 10 mg/kg intravenous NDP or vehicle alone (5% xylitol solution) and were sacrificed six days later. The kidneys were dissected into the RC and RP and used for histopathological and microarray analyses. Histopathologically, NDP caused characteristic renal lesions, such as necrosis, single cell necrosis (with TUNEL TdT-mediated dUTP-biotin nick end labelling-positive) and regeneration/hyperplasia of the epithelial cells in both renal regions. Global gene expression analysis revealed that several genes involved in various functional categories were commonly deregulated in both renal regions, such as apoptosis, cell cycle regulation, DNA metabolism, cell migration/adhesion and cytoskeleton organization or genes induced as a perturbation of oxidative status and calcium homeostasis. Comparative analysis of gene expression between RC and RP revealed that genes encoding several subtypes of cytokeratins were identified as being specifically overexpressed in RP by the NDP treatment. Differential expression patterns of these selected genes observed by microarray analysis were further confirmed by quantitative real time RT-PCR and immunohistochemistry, which demonstrated increased expression of cytokeratins (CKs) 14 and 19 at the epithelium covering RP and/or collecting duct epithelium. Overall, the results contribute to understanding the renal molecular events of NDP-induced nephrotoxicity including novel potential biomarker genes encoding CKs 14 and 19 that may serve as indicators of renal papillary toxicity.
authors.affiliation: Developmental Research Laboratories, Shionogi & Co., Ltd., 3-1-1 Futaba-cho, Toyonaka, Osaka 561-0825, Japan. takeki.uehara@shionogi.co.jp
authors.forename: Takeki
authors.initials: T
authors.lastname: Uehara
authors.forename: Takako
authors.initials: T
authors.lastname: Miyoshi
authors.forename: Noriko
authors.initials: N
authors.lastname: Tsuchiya
authors.forename: Koichi
authors.initials: K
authors.lastname: Masuno
authors.forename: Manabu
authors.initials: M
authors.lastname: Okada
authors.forename: Satoshi
authors.initials: S
authors.lastname: Inoue
authors.forename: Mikinori
authors.initials: M
authors.lastname: Torii
authors.forename: Jyoji
authors.initials: J
authors.lastname: Yamate
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Maruyama
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000633:toxicity*; D002945:Cisplatin / Q000633:toxicity; D020869:Gene Expression Profiling; D053547:Keratin-14 / Q000235:genetics; D053539:Keratin-19 / Q000235:genetics; D007672:Kidney Cortex / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D007679:Kidney Medulla / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008297:Male; D009944:Organoplatinum Compounds / Q000633:toxicity*; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000970:Antineoplastic Agents; D053547:Keratin-14; D053539:Keratin-19; C507539:Krt14 protein, rat; D009944:Organoplatinum Compounds; D012333:RNA, Messenger; C053989:nedaplatin; D002945:Cisplatin