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Simulated microgravity activates MAPK pathways in fibroblasts cultured on microgrooved surface topography
W A Loesberg1, X F Walboomers, J J W A van Loon
1Department of Periodontology and Biomaterials, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
Cell Motility and the Cytoskeleton
|November 8, 2007
Summary
Fibroblast cell behavior is significantly influenced by both microgrooved surfaces and simulated microgravity. Microgravity alters cell morphology and gene expression, impacting cell-substratum interactions via MAPK pathways.
Area of Science:
- Cell Biology
- Biomaterials Science
- Mechanobiology
Background:
- Cellular behavior is influenced by substrate topography and gravity.
- Understanding these influences is crucial for tissue engineering and space biology.
Purpose of the Study:
- To evaluate the impact of microgrooved surfaces versus smooth surfaces on fibroblast morphology under simulated microgravity.
- To determine the dominant factor influencing cell behavior: topography or gravity.
Main Methods:
- In vitro culture of fibroblasts on smooth and microgrooved substrata.
- Scanning electron and fluorescence microscopy for morphological analysis.
- Quantitative PCR (QPCR) for gene expression (collagen, integrins).
- Immunoblotting for MAPK signaling pathways and small GTPases.
Main Results:
- Fibroblasts aligned with groove direction on textured surfaces; random on smooth surfaces.
- Simulated microgravity altered cell shape but alignment on grooved surfaces remained similar to 1g conditions.
- Microgravity reduced beta3-integrin and collagen gene expression, while up-regulating alpha1- and beta1-integrin.
- MAPK pathways (JNK/SAPK, p38) and small GTPases (RhoA, Cdc42) were activated under microgravity.
Conclusions:
- Both topography and gravity significantly affect fibroblast behavior.
- Microgravity induces morphological changes and alters cell-substratum protein expression through MAPK signaling.
