<abstract xmlns="http://www.w3.org/1999/xhtml"><bold>Background</bold>: Claudin-1 is involved in various cancers, but its expression and role in gastric carcinoma remain unclear.<bold>Materials and Methods</bold>: Gastric carcinoma and adjacent normal tissues were harvested from 60 patients. Claudin-1 expression was detected by RT-qPCR. The expressions in human gastric carcinoma MKN45, SGC7901 and MKN28 cells and immortalized human gastric epithelium GES-1 cells were determined by RT-qPCR and Western blotting. Claudin-1 was overexpressed in SGC7901 cells by lentiviral transfection, and they were divided into Control (untransfected), normal control (NC) (transfected with lentiviral vector) and Claudin-1 (transfected with Claudin-1 overexpression lentivirus) groups. The proliferation, invasion and migration of gastric carcinoma cells were detected through cell counting kit-8, Transwell and wound healing assays, respectively. The effects of Claudin-1 on the expressions of epithelial-mesenchymal transition (EMT) marker proteins E-cadherin and N-cadherin were detected by Western blotting. Ten 4-week-old male BALB/c nude mice were subcutaneously injected with lentivirus-treated SGC7901 cells to establish the transplanted tumor model, and the effect of overexpression of Claudin-1 was explored.<bold>Results</bold>: The expression of Claudin-1 in gastric carcinoma tissues was significantly lower than that in adjacent tissues (P&lt;0.05). Overexpression of Claudin-1 significantly inhibited the proliferation, invasion and migration of SGC7901 cells, increased the expression of E-cadherin, and decreased that of N-cadherin (P&lt;0.05). Overexpression of Claudin-1 in the mouse model significantly inhibited the growth of subcutaneous transplanted tumors (P&lt;0.05).<bold>Conclusion</bold>: Claudin-1 has low expression in gastric carcinoma tissues. Overexpression of Claudin-1 inhibits the proliferation, invasion, migration, and EMT of gastric carcinoma cells, and subcutaneous tumorigenesis in nude mice.</abstract>

Background: Claudin-1 is involved in various cancers, but its expression and role in gastric carcinoma remain unclear.Materials and Methods: Gastric carcinoma and adjacent normal tissues were harvested from 60 patients. Claudin-1 expression was detected by RT-qPCR. The expressions in human gastric carcinoma MKN45, SGC7901 and MKN28 cells and immortalized human gastric epithelium GES-1 cells were determined by RT-qPCR and Western blotting. Claudin-1 was overexpressed in SGC7901 cells by lentiviral transfection, and they were divided into Control (untransfected), normal control (NC) (transfected with lentiviral vector) and Claudin-1 (transfected with Claudin-1 overexpression lentivirus) groups. The proliferation, invasion and migration of gastric carcinoma cells were detected through cell counting kit-8, Transwell and wound healing assays, respectively. The effects of Claudin-1 on the expressions of epithelial-mesenchymal transition (EMT) marker proteins E-cadherin and N-cadherin were detected by Western blotting. Ten 4-week-old male BALB/c nude mice were subcutaneously injected with lentivirus-treated SGC7901 cells to establish the transplanted tumor model, and the effect of overexpression of Claudin-1 was explored.Results: The expression of Claudin-1 in gastric carcinoma tissues was significantly lower than that in adjacent tissues (P<0.05). Overexpression of Claudin-1 significantly inhibited the proliferation, invasion and migration of SGC7901 cells, increased the expression of E-cadherin, and decreased that of N-cadherin (P<0.05). Overexpression of Claudin-1 in the mouse model significantly inhibited the growth of subcutaneous transplanted tumors (P<0.05).Conclusion: Claudin-1 has low expression in gastric carcinoma tissues. Overexpression of Claudin-1 inhibits the proliferation, invasion, migration, and EMT of gastric carcinoma cells, and subcutaneous tumorigenesis in nude mice.

Expression of tight junction transmembrane protein Claudin-1 in gastric carcinoma and effects on tumor cell proliferation, invasion and migration

Revista Romana de Medicina de Laborator

This work is licensed under the Creative Commons Attribution 4.0 International License.

Background: Claudin-1 is involved in various cancers, but its expression and role in gastric carcinoma remain unclear.Materials and Methods: Gastric carcinoma...

Expression of tight junction transmembrane protein Claudin-1 in gastric carcinoma and effects on tumor cell proliferation, invasion and migration

Published Online: Feb 12, 2022

Page range: 81 - 91

Received: Sep 29, 2021

Accepted: Jan 15, 2022

DOI: https://doi.org/10.2478/rrlm-2022-0007

Keywords
proliferation, gastric cancer, invasion, Claudin-1, epithelial-mesenchymal transition

© 2022 Jun Lv et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Expression of tight junction transmembrane protein Claudin-1 in gastric carcinoma and effects on tumor cell proliferation, invasion and migration

Published Online: Feb 12, 2022

Page range: 81 - 91

Received: Sep 29, 2021

Accepted: Jan 15, 2022

DOI: https://doi.org/10.2478/rrlm-2022-0007

Keywordsproliferation, gastric cancer, invasion, Claudin-1, epithelial-mesenchymal transition

© 2022 Jun Lv et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
proliferation, gastric cancer, invasion, Claudin-1, epithelial-mesenchymal transition