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Fluid shear stress regulates HepG2 cell migration though time-dependent integrin signaling cascade
Hongchi Yu1, Yang Shen1, Jingsi Jin1
1a Institute of Biomedical Engineering , School of Preclinical and Forensic Medicine, Sichuan University , Chengdu , China.
Cell Adhesion & Migration
|June 22, 2017
Summary
Fluid shear stress (FSS) significantly enhances hepatocellular carcinoma (HCC) cell migration by altering cell structure and signaling pathways. This study reveals FSS
Area of Science:
- Biophysics
- Cell Biology
- Oncology
Background:
- Hepatocellular carcinoma (HCC) is an aggressive liver cancer with limited therapeutic options.
- Mechanical forces within the tumor microenvironment, particularly fluid shear stress (FSS), influence cancer cell behavior.
- The precise time-dependent molecular mechanisms of FSS-induced changes in HCC remain largely unexplored.
Purpose of the Study:
- To investigate the time-dependent effects of fluid shear stress (FSS) on hepatocellular carcinoma (HCC) cell migration.
- To elucidate the underlying mechanochemical signal transduction pathways, including Integrins and FAK-Rho GTPases, in response to FSS.
- To understand how FSS modulates cellular structures like F-actin and tight junctions in HCC cells.
Main Methods:
- Hepatocellular carcinoma HepG2 cells were subjected to controlled FSS (1.4 dyn/cm²) for various durations (seconds to hours).
- Analysis of cellular F-actin reorganization and intercellular tight junction integrity.
- Examination of the expression and subcellular localization of Integrins, focal adhesion components (Paxillin, Vinculin, Talin), and Rho GTPases (Cdc42, Rac1, RhoA).
Main Results:
- FSS exposure increased HepG2 cell migration by reorganizing F-actin and disrupting tight junctions.
- FSS modulated Integrin expression and translocation in a time-dependent manner.
- Longer FSS exposure downregulated focal adhesion proteins while upregulating Rho GTPases, indicating a shift in cell adhesion and motility.
Conclusions:
- FSS promotes HCC cell migration through a time-dependent Integrins-FAK-Rho GTPases signaling pathway.
- These findings highlight the critical role of FSS in liver cancer progression.
- Understanding FSS-mediated mechanotransduction offers potential novel therapeutic strategies for HCC.
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