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Cell-matrix adhesions on poly(vinyl alcohol) hydrogels
Miles B Zajaczkowski1, Edna Cukierman, Catherine G Galbraith
1Craniofacial Developmental Biology and Regeneration Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA.
Tissue Engineering
|July 15, 2003
Summary
Attaching fibronectin to poly(vinyl) alcohol hydrogels created intermediate cell-matrix adhesions. This suggests bioactive polymers can control cell adhesion structures for tissue engineering.
Area of Science:
- Cell Biology
- Biomaterials Science
- Tissue Engineering
Background:
- Cell-matrix adhesions are crucial for cell function and tissue architecture.
- Controlling these adhesions requires understanding how substrate attachment methods influence their molecular organization.
Purpose of the Study:
- To visualize and quantify cell-matrix adhesions formed by human fibroblasts.
- To compare adhesions on fibronectin covalently attached to poly(vinyl) alcohol (PVA) hydrogels with those on fibronectin coated or immobilized on glass coverslips.
Main Methods:
- Immunofluorescence confocal microscopy was used to characterize cell adhesions.
- Paxillin and alpha(5) integrin were utilized as markers for focal and fibrillar adhesions, respectively.
Main Results:
- Cells on fibronectin-conjugated PVA showed diminished spatial separation of paxillin and alpha(5) integrin compared to noncovalently coated glass.
- Covalent immobilization of fibronectin on glass resulted in the strongest marker colocalization and a complete loss of fibrillar adhesions.
- Fibronectin-conjugated PVA promoted intermediate cell adhesion structures.
Conclusions:
- Fibronectin-conjugated PVA facilitates cell adhesion structures intermediate between noncovalent and covalent immobilization.
- Bioactive polymers can selectively induce specific cell-matrix adhesions, with potential applications in tissue engineering.