title: Elevated pressure, a novel cancer therapeutic tool for sensitizing cisplatin-mediated apoptosis in A549.
abstract: Intensive cancer therapy strategies have thus far focused on sensitizing cancer cells to anticancer drug-mediated apoptosis to overcome drug resistance, and this strategy has led to more effective cancer therapeutics. Cisplatin (cis-diamminedichloroplatinum(II), CDDP) is an effective anticancer drug used to treat many types of cancer, including non-small cell lung carcinoma (NSCLC), and can be used in combination with various chemicals to enhance cancer cell apoptosis. Here, we introduce the use of elevated pressure (EP) in combination with CDDP for cancer treatment and explore the effects of EP on CDDP-mediated apoptosis in NSCLC cells. Our findings demonstrate that preconditioning NSCLC cells with EP sensitizes cells for CDDP-induced apoptosis. Enhanced apoptosis was dependent on p53 and HO-1 expression, and was associated with increased DNA damage and down-regulation of genes involved in nucleotide excision repair. The transcriptional levels of transporter proteins indicated that the mechanism by which EP-induced CDDP sensitization was intracellular drug accumulation. The protein levels of some antioxidants, such as hemeoxygenase-1 (HO-1), glutathione (GSH) and glutathione peroxidase (Gpx), were decreased in A549 cells exposed to EP via the down-regulation of the transcription factor nuclear factor (erythroid-derived 2)-like 2 (Nrf-2). Furthermore, normal human fibroblasts were resistant to EP treatment, with no elevated DNA damage or apoptosis. Collectively, these data show that administration of EP is a potential adjuvant tool for CDDP-based chemosensitivity of lung cancer cells that may reduce drug resistance.
authors.affiliation: Korea University, Seoul, Republic of Korea.
authors.forename: Sangnam
authors.initials: S
authors.lastname: Oh
authors.forename: Yanghee
authors.initials: Y
authors.lastname: Kim
authors.forename: Joonhee
authors.initials: J
authors.lastname: Kim
authors.forename: Daeho
authors.initials: D
authors.lastname: Kwon
authors.forename: Eunil
authors.initials: E
authors.lastname: Lee
mesh_terms: D000970:Antineoplastic Agents / Q000627:therapeutic use*; D017209:Apoptosis; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy / Q000628:therapy*; D045744:Cell Line, Tumor; D002945:Cisplatin / Q000627:therapeutic use*; D004249:DNA Damage; D004260:DNA Repair / Q000235:genetics; D019008:Drug Resistance, Neoplasm; D051547:Heme Oxygenase-1 / Q000037:antagonists & inhibitors / Q000235:genetics; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000628:therapy*; D051267:NF-E2-Related Factor 2 / Q000037:antagonists & inhibitors; D011312:Pressure; D013314:Stress, Mechanical
chemical_list: D000970:Antineoplastic Agents; D051267:NF-E2-Related Factor 2; C495635:NFE2L2 protein, human; C496541:HMOX1 protein, human; D051547:Heme Oxygenase-1; D002945:Cisplatin