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Osteopontin-dependent CD44v6 expression and cell adhesion in HepG2 cells.
Chengjiang Gao1, Hongtao Guo, Laura Downey
1Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA.
Carcinogenesis
|September 2, 2003
Summary
Osteopontin (OPN) increases CD44v6 expression in liver cancer cells, promoting cell adhesion. This interaction with alphavbeta3-integrin may drive cancer metastasis.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Osteopontin (OPN) interaction with CD44 and alphavbeta3-integrin is linked to cancer metastasis.
- CD44v6, a CD44 splice variant, is a marker for cancer progression.
Purpose of the Study:
- To investigate the effect of OPN on CD44 standard (CD44s) and CD44v6 isoforms in liver carcinoma cells (HepG2).
- To elucidate the role of OPN-alphavbeta3-integrin binding in regulating CD44v6 expression and cell adhesion.
Main Methods:
- Western blot analysis to quantify CD44v6 protein expression.
- In vitro cell adhesion assays using HepG2 cells and hyaluronate (HA).
- Inhibition studies using RGD peptide and tyrosine kinase inhibitors.
Main Results:
- OPN significantly up-regulated plasma membrane CD44v6 protein expression in a dose- and time-dependent manner.
- OPN increased CD44v6 protein synthesis and decreased its degradation.
- OPN enhanced HepG2 cell adhesion to hyaluronate, which was dependent on CD44.
Conclusions:
- OPN binding to alphavbeta3-integrin increases CD44v6 expression on the plasma membrane.
- OPN enhances hepatocellular carcinoma cell adhesion to hyaluronate via CD44.
- These findings suggest a mechanism for OPN in promoting hepatocellular cancer metastasis.