International Journal of Molecular and Cellular Medicine (IJMCM)
Cellular and Molecular Biology Research Center, Babol University of Medical Sciences
Fri, Apr 4, 2025
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Volume 12, Issue 4 (Int J Mol Cell Med 2023)
Int J Mol Cell Med 2023, 12(4): 361-371 |
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Mahdian Z, Pouramir M, Akrami H, Zabihi E. Evaluation of Drug Resistance in the Tamoxifen-treated MKN-45 Gastric Cancer Cell Line via the Epithelial-mesenchymal Transition Signaling Pathway. Int J Mol Cell Med 2023; 12 (4) :361-371
URL: http://ijmcmed.org/article-1-2308-en.html
URL: http://ijmcmed.org/article-1-2308-en.html
1- Department of Clinical Biochemistry, School of Medicine, Babol University of Medical Sciences, Babol, Iran.
2- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran. ,pouramir@yahoo.com
3- Gastroenterohepatology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
4- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.
2- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran. ,
3- Gastroenterohepatology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
4- Cellular and Molecular Biology Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.
Abstract: (702 Views)
One of the major challenges in gastric cancer (GC) chemotherapy is the phenomenon of multi-drug resistance (MDR). The epithelial-mesenchymal transition (EMT) and its key molecules, transforming growth factor-β (TGFβ) and SMAD2, play a central role in MDR occurrence. Tamoxifen (TAM), a triphenylethylene derivative, can overcome MDR in human gastric cancers. The aim of this study was to investigate the effect of TAM on 5-FU resistance of GC by suppressing the TGFβ1/SMAD2 signaling pathway and EMT. The MKN-45 cell line was subjected to treatment with 5-FU, TAM and a combination of both. The MTT assay was used to investigate the cytotoxic effects of 5-FU and TAM, and the DNA laddering technique was used to assess DNA fragmentation and apoptosis. Real-time RT-PCR examined the change in gene expression in EMT-related genes (SNAI2, VIM, TGFβ1 and SMAD2). The results of the present study indicated that not only TAM treatment significantly decreased the IC50 of 5-FU (P≤0.05), but also the addition of TAM to 5-FU induced apoptosis in the MKN-45 cell line. Treatment with TAM and 5-FU significantly inhibited TGFβ1 and TGFβ1-induced expression of EMT markers (VIM and SNAI2) in MKN-45 cells (P≤0.05). The reduction of TGFβ1 targets downstream of the SMAD2 signaling pathway reversed the process of EMT and significantly increased the sensitivity of MKN-45 cells to 5-FU. The results of the present study suggested that reversal of EMT-mediated MDR via the TGFβ1/SMAD signaling pathway using TAM may be a potential new therapeutic strategy to overcome chemoresistance to 5-FU during GC chemotherapy.
Keywords: Epithelial-mesenchymal transition, gastric cancer, drug resistance, Tamoxifen, TGFβ1/ SMAD2 signaling pathway
Type of Study: Original Article |
Subject:
Cancer
Received: 2024/03/30 | Accepted: 2024/05/29 | Published: 2024/06/22
Received: 2024/03/30 | Accepted: 2024/05/29 | Published: 2024/06/22
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