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Cell sheet detachment affects the extracellular matrix: a surface science study comparing thermal liftoff, enzymatic,
Heather E Canavan1, Xuanhong Cheng, Daniel J Graham
1National ESCA and Surface Analysis Center for Biomedical Problems, Box 351750, University of Washington, Seattle, WA, USA.
Journal of Biomedical Materials Research. Part A
|August 9, 2005
Summary
Low-temperature liftoff from smart polymers gently removes endothelial cells, preserving extracellular matrix. This method is superior to enzymatic or mechanical cell removal for maintaining surface integrity and promoting subsequent cell adhesion.
Area of Science:
- Biomaterials Science
- Cell Biology
- Surface Chemistry
Background:
- Cell sheet engineering requires non-destructive methods for cell removal.
- Plasma polymerized N-isopropyl acrylamide (ppNIPAM) is a smart polymer responsive to temperature changes.
- Preservation of the extracellular matrix (ECM) is crucial for cell adhesion and tissue regeneration.
Purpose of the Study:
- To compare the efficacy and impact of three cell removal techniques on endothelial cell layers and underlying surfaces.
- To evaluate the preservation of extracellular matrix (ECM) after cell detachment.
- To assess the influence of different cell removal methods on subsequent cell adhesion.
Main Methods:
- Bovine aortic endothelial cell (BAEC) monolayers were detached using low-temperature liftoff from ppNIPAM, enzymatic digestion, and mechanical dissociation.
- Surface analysis was performed using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS).
- Immunostaining and cell adhesion assays were conducted to evaluate ECM integrity and surface cell-promoting properties.
Main Results:
- Low-temperature liftoff non-destructively removed cell sheets while preserving most of the underlying ECM.
- Enzymatic digestion and mechanical dissociation caused significant damage to both cells and ECM.
- XPS and ToF-SIMS confirmed the presence of ECM proteins and amino acid fragments on surfaces after liftoff.
- Cell adhesion assays showed that liftoff and mechanical dissociation surfaces supported better subsequent cell adhesion.
Conclusions:
- Low-temperature liftoff from ppNIPAM is a gentle and effective method for detaching endothelial cell sheets.
- This technique minimally damages the ECM, preserving crucial surface cues for cell interactions.
- The preserved ECM enhances cell adhesion compared to cells removed by enzymatic or mechanical methods.