RT Journal Article
SR Electronic
T1 Identification by Functional Cloning from a Retroviral cDNA Library of cDNAs for Ribosomal Protein L36 and the 10-kDa Heat Shock Protein that Confer Cisplatin Resistance
JF Molecular Pharmacology
JO Mol Pharmacol
FD American Society for Pharmacology and Experimental Therapeutics
SP 1383
OP 1388
DO 10.1124/mol.105.017525
VO 69
IS 4
A1 Ding-Wu Shen
A1 Xing-Jie Liang
A1 Toshihiro Suzuki
A1 Michael M. Gottesman
YR 2006
UL http://molpharm.aspetjournals.org/content/69/4/1383.abstract
AB Based on analyses of two-dimensional gel and cDNA microarrays, our laboratory and others have demonstrated that a number of genes show altered expression during the development of cisplatin resistance (CP-r) in human cancer cells, including genes associated with DNA damage repair, proto-oncogenes, apoptosis, stress-response, and transcription factors. To verify these results and find genes that are directly responsible for CP-r, as opposed to those reflecting a secondary response induced by cisplatin treatment or resulting from CP-r, we constructed a retroviral cDNA library in the vector pLNCX2 from KB-CP.5 (KCP.5), a cell line selected in one step after exposure to cisplatin at 0.5 μg/ml. Using a library of cDNAs (1.8 × 106 cDNA clones) and an intermittent cisplatin selection system to allow more effective functional cloning, 11 expressed cDNAs were identified in a primary pool of 93,000 transfected cell clones. Metallothionein 2A, a known CP-r gene, was among these 11 genes found in the transfectants after CP selection. Several other genes, including those encoding ribosomal proteins (e.g., RPL36) and heat shock protein (e.g., HSP10), were also found among the cisplatin-selected clones. Transfection of either the RPL36 cDNA or HSP10 cDNA conferred on KB-3-1 cells 2.5- to 3-fold resistance to cisplatin by clonogenic assays. A subsequent transfection also identified RPL36 as a CP-r gene. The finding that a ribosomal protein gene, RPL36, contributes to CP-r should stimulate study of the role of ribosomal proteins in multifactorial mechanisms of cisplatin resistance.