Project description:Chemotherapy remains the primary treatment of advanced solid cancer, including lung cancer. As first line treatment, cisplatin-based therapy is restricted by frequent development of drug resistance. Increasing data showed that programmed cell death protein ligand 1 (PD-L1) plays a vital role in regulating cisplatin resistance. However, the mechanisms underlying are not fully understood. We found miR-526b-3p expression declined while PD-L1 elevated in cisplatin-resistant lung cancer compared to that in cisplatin-sensitive lung cancer by analyzing clinical samples. Importantly, miR-526b-3p was associated with response to cisplatin negatively. We further demonstrated that miR-526b-3p reversed cisplatin resistance, suppressed metastasis, and activated CD8+ T cells in a STAT3/PD-L1-dependent manner. Our findings extended the knowledge of PD-L1-mediated cisplatin resistance of lung cancer. In addition, the introduction of miR-526b-3p provided a new clue to improve the anti-tumor effects of the combination of immunotherapy and chemotherapy. miProfileTM Cancer miRNA qPCR Array
Project description:Platinum resistance is a major drawback in the treatment of ovarian cancer. Evidence suggests that microRNAs are key players in the initiation, progression, and drug resistance of cancer cells. However, the precise miRNAs dysregulated and contributing to platinum resistance in ovarian cancer cells have not been fully elucidated. Here, we conducted a miRNA expression profiling of cisplatin-sensitive (A2780) and cisplatin-resistant (CP20 and CIS) ovarian cancer cells to identify potential miRNAs involved in platinum resistance.
Project description:miRNA was extracted from a range of Oesophageal Adenocarcinoma cell lines using the miRNeasy Mini Kit (Qiagen, #217004, Chadstone, Australia) and RNase-free DNase Set (Qiagen, #79254, Chadstone, Australia). miRNA was reverse transcribed using a Custom OpenArray® miRNA RT pool (Life Technologies cat # A25630) and the TaqMan® microRNA Reverse Transcription Kit (Life Technologies cat # 4366596). cDNA Pre-amplifications were carried out with a Custom OpenArray® PreAmp pool (Life Technologies cat # 4485255) and TaqMan PreAmp Master Mix (Life Technologies cat # 4488593). PCR runs were performed using a QuantStudio™ 12K Flex Real-Time PCR System. Baseline qPCR expression profiling of miRNAs from 8 oesophageal Adenocarcinoma cell lines, prior to treating the cell lines with either 2Gy ionising radiation, 20 µM Cisplatin, or 50 µM 5-fluorouracil (5-FU).
Project description:This SuperSeries is composed of the following subset Series: GSE15372: Expression data from A2780 (cisplatin-sensitive) and Round5 A2780 (cisplatin-resistant) cell lines. GSE15373: Promoter CpG island methylation data from A2780 (cisplatin-sensitive) and Round5 A2780 (cisplatin-resistant) cell lines. Refer to individual Series