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Enlarged cell-associated proteoglycans abolish E-cadherin functionality in invasive tumor cells
K L Vleminckx1, J J Deman, E A Bruyneel
1Laboratory of Molecular Cell Biology, University of Ghent, Belgium.
Cancer Research
|February 15, 1994
Summary
Enlarged cell-associated proteoglycans can hinder E-cadherin function, promoting cancer cell invasion and metastasis. A specific drug treatment reduced proteoglycans, restoring cell adhesion and inhibiting invasiveness.
Area of Science:
- Cell Biology
- Cancer Research
- Biochemistry
Background:
- E-cadherin is a crucial cell-cell adhesion molecule involved in maintaining tissue integrity.
- Dysfunctional E-cadherin is linked to cancer invasion and metastasis.
- The precise mechanisms by which E-cadherin function is lost in cancer remain under investigation.
Purpose of the Study:
- To investigate the role of cell-associated proteoglycans in E-cadherin-mediated cell adhesion.
- To explore potential therapeutic strategies targeting proteoglycans to inhibit cancer cell invasiveness.
Main Methods:
- Utilized mouse and dog epithelial cell lines engineered for high E-cadherin expression.
- Generated and isolated invasive tumors from athymic mice.
- Analyzed cell morphology, Ca(2+)-dependent cell aggregation, and in vitro invasiveness.
- Quantified cell-associated proteoglycans and assessed E-cadherin localization.
- Treated cells with 4-methylumbelliferyl beta-D-xyloside to modulate proteoglycan levels.
Main Results:
- Invasive cell lines exhibited enlarged cell-associated proteoglycans and impaired E-cadherin function, despite normal surface expression.
- Treatment with 4-methylumbelliferyl beta-D-xyloside reduced proteoglycan size and amount.
- This drug treatment restored epithelial morphology, enhanced Ca(2+)- and E-cadherin-dependent cell aggregation, and abrogated invasiveness.
Conclusions:
- Enlarged proteoglycans likely inhibit E-cadherin homophilic binding through steric hindrance, contributing to cancer malignancy.
- Targeting cell-associated proteoglycans represents a potential therapeutic approach to counteract cancer invasion.