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Published on: August 25, 2018
The mechanism for keratinocyte detaching from pH-responsive chitosan
Yi-Hsin Chen1, Shao-Hsuan Chang2, I-Jong Wang3
1Institute of Polymer Science and Engineering, College of Engineering, National Taiwan University, Taipei, 106, Taiwan.
Cell detachment from pH-responsive chitosan surfaces was investigated. HaCaT cells showed reduced detachment, linked to calcium-dependent integrin β4 (ITGb4) and laminin interactions, crucial for controlling cell adhesion.
Area of Science:
- Biomaterials Science
- Cell Biology
- Surface Chemistry
Background:
- pH-responsive chitosan surfaces offer tunable cell adhesion properties.
- Understanding cell detachment mechanisms is vital for biomaterial applications.
Purpose of the Study:
- To investigate the differential detachment of HaCaT and Hs68 cells from pH-responsive chitosan.
- To elucidate the role of calcium ions and integrin receptors in HaCaT cell detachment.
Main Methods:
- Comparing cell detachment ratios of HaCaT and Hs68 cells at elevated pH.
- Utilizing EDTA to assess calcium ion involvement.
- Examining integrin receptor expression (ITGb4) via RT-PCR and immunocytochemistry.
- Modulating ITGb4 activity with blocking antibodies and its ligand, laminin.
Main Results:
- HaCaT cells exhibited lower detachment than Hs68 cells, even with extended incubation or enhanced cytoskeletal force.
- Calcium ions were critical for HaCaT cell detachment.
- Integrin β4 (ITGb4) was HaCaT cell-specific, with higher expression in undetached cells.
- Blocking ITGb4 increased detachment, while adding laminin decreased it, an effect rescued by blocking antibody.
Conclusions:
- Calcium-dependent integrin β4 (ITGb4) plays a significant role in HaCaT cell adhesion to pH-responsive chitosan.
- The interaction between ITGb4 and laminin is a key factor controlling HaCaT cell detachment from these surfaces.
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