Unknown,Transcriptomics,Genomics,Proteomics

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Gene Expression in Cisplatin Resistance HeLa Cells

ABSTRACT: Cisplatin resistance is a problem in cancer treatment. Using DNA microarray, we detected differentially expressed genes in cisplatin-resistant cervix carcinoma HeLa cells compared to parental cells. Three cisplatin resistant cell lines were established by stepwise increasing cisplatin concentration. RNA from these resistant lines and its parental HeLa cells were labeled with Cy5 and Cy3. Equal amount of RNA from resistant cell line and HeLa were mixed and were hybridized to cDNA array. Signals were scanned and analyzed to find out the candidate genes involved in cisplatin resistant mechanism.

ORGANISM(S): Homo sapiens

SUBMITTER: Ching-Kuey Chao

PROVIDER: E-GEOD-15120 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The development of chemo-resistance has dramatically limited the clinical efficiency of platinum-based therapy. Although many resistant mechanisms have been demonstrated, genetic/molecular alterations responsible for drug resistance in the majority of clinical cases has not been identified. We analyzed three pairs of testicular germ cell tumor (TGCT) cell lines using Affymetrix expression microarrays to identify differential expressed genes. Then the expression of CCND1/CyclinD1, selected from the microarray analysis, was determined in cisplatin sensitive and resistance cancer samples including TGCTs, ovarian and prostate cancers by quantitative reverse transcription PCR analysis (qRT-PCR). Finally, we determined the gene knocked-down effect of CyclinD1. Expression microarray study revealed a limited number of differentially expressed genes across all three cell lines when comparing the parental and resistant cells. Among them, CyclinD1 was the most significantly differentially expressed gene. Importantly, we found that, in clinical TGCT samples, the overall expression level of cyclinD1 is higher in resistant cases compared to those sensitive samples (9/12 in the resistant group and only 3/8 in the sensitive group). We also found that cyclinD1 expressed dozens of fold higher in the resistant than in the sensitive ovarian cancer cell lines and dramatically overexpressed in prostate cancer. We re-sensitized the resistant cells by knocking-down cyclinD1. We demonstrated that deregulation of cyclinD1 is the major cause of TGCT cisplatin resistance and it may also be commonly involved in other human cancers. Combined cyclinD1 inhibition and cisplatin chemotherapy may be used clinically to treat the large number of cyclinD1 deregulated resistant tumors. RNA from three paired parental and cisplatin-resistant TGCT cell lines was extracted and analysed by Affymetrix gene expression microarray profiling (Human Genome U133 plus 2.0 arrays). Expression changes associated with the resistant phenotype were identified by comparing the three cisplatin-resistant derivatives to their parental counterparts.

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Gene Expression in Cisplatin Resistance HeLa Cells

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