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MiR-30a Decreases Multidrug Resistance (MDR) of Gastric Cancer Cells
Chunying Li1, Jinhai Zou2, Guoqi Zheng1
1Department of Gastroenterology, Cangzhou Central Hospital, Cangzhou, Hebei, China (mainland).
Abstract:
BACKGROUND The effectiveness of chemotherapy for gastric cancer is largely limited by either intrinsic or acquired drug resistance. In this study, we aimed to explore the association between miR-30a dysregulation and multidrug resistance (MDR) in gastric cancer cells. MATERIAL AND METHODS We recruited 20 patients with advanced gastric cancer. Chemosensitivity was assessed after completion of the chemotherapy. SGC-7901 and SGC-7901/DDP cells were transfected for miR-30a overexpression or knockdown. Then, MTT assay was performed to assess the IC50 of DPP and 5-FU in SGC-7901 and SGC-7901/DDP cells. Flow cytometry analysis was used to detect DPP- and 5-FU-induced cell apoptosis. Western blot analysis and immunofluorescence staining were used to assess EMT of the cells. RESULTS MiR-30a was significantly downregulated in the chemoresistant tissues. In both SGC-7901 and SGC-7901/DDP cells, miR-30a overexpression decreased the expression of P-gp, a MDR-related protein. MTT assay and flow cytometry analysis showed that miR-30a inhibition increased chemoresistance, while miR-30a overexpression decreased chemoresistance in gastric cancer cells. Both Western blot analysis and immunofluorescence staining confirmed that miR-30a inhibition decreased E-cadherin but increased N-cadherin in SGC-7901 cells, while miR-30a overexpression increased E-cadherin but decreased N-cadherin in SGC-7901 cells. CONCLUSIONS MiR-30a can decrease multidrug resistance (MDR) of gastric cancer cells. It is also an important miRNA modulating EMT of the cancer cells.
Insights
MicroRNA-30a (miR-30a) downregulation is linked to multidrug resistance (MDR) in gastric cancer. Restoring miR-30a levels can reduce chemoresistance and modulate epithelial-mesenchymal transition (EMT) in gastric cancer cells.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Chemotherapy resistance significantly limits gastric cancer treatment efficacy.
- Intrinsic and acquired drug resistance are major challenges in managing gastric cancer.
- Understanding the molecular mechanisms underlying drug resistance is crucial for improving patient outcomes.
Purpose of the Study:
- To investigate the association between miR-30a dysregulation and multidrug resistance (MDR) in gastric cancer.
- To explore the role of miR-30a in modulating chemoresistance and epithelial-mesenchymal transition (EMT) in gastric cancer cells.
Main Methods:
- Recruited 20 advanced gastric cancer patients for chemosensitivity assessment.
- Utilized SGC-7901 and SGC-7901/DDP cells for miR-30a overexpression and knockdown experiments.
- Assessed chemoresistance via MTT assays (IC50) and flow cytometry (apoptosis).
- Evaluated EMT markers (E-cadherin, N-cadherin) using Western blot and immunofluorescence.
Main Results:
- MiR-30a was significantly downregulated in chemoresistant gastric cancer tissues.
- Overexpression of miR-30a reduced P-glycoprotein (P-gp) expression, a key MDR-related protein.
- MiR-30a inhibition increased chemoresistance, while miR-30a overexpression decreased it.
- MiR-30a modulated EMT markers, with inhibition decreasing E-cadherin and increasing N-cadherin, and vice versa for overexpression.
Conclusions:
- MiR-30a plays a critical role in decreasing multidrug resistance (MDR) in gastric cancer cells.
- MiR-30a is an important microRNA that regulates epithelial-mesenchymal transition (EMT) in gastric cancer.
- Targeting miR-30a may represent a potential therapeutic strategy to overcome chemoresistance in gastric cancer.
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