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Cell-cell adhesion in human fibroblasts requires calcium signaling
1CIHR Group in Periodontal Physiology, Faculty of Dentistry, University of Toronto, Toronto, Ontario M5S 3E2, Canada. kevin_ko@hotmail.com
Journal of Cell Science
|March 3, 2001
Summary
Cell-cell adhesion in fibroblasts triggers intracellular calcium signaling, essential for tissue repair and development. This calcium flux regulates cell connections by remodeling actin and recruiting key proteins like cadherins and beta-catenin.
Area of Science:
- Cell Biology
- Biochemistry
- Tissue Engineering
Background:
- Intercellular adhesion is crucial for tissue development and wound healing.
- The specific signaling pathways governing fibroblast cell-cell adhesion remain largely unknown.
Purpose of the Study:
- To investigate the role of intracellular calcium signaling in mediating fibroblast intercellular adhesion.
- To elucidate the mechanisms by which cell-cell adhesion is regulated in fibroblasts.
Main Methods:
- Utilized Fura-2 and Fluo-3 labeled human fibroblasts to monitor calcium homeostasis.
- Employed antibodies against cadherin domains to probe adhesion-initiated signaling.
- Investigated calcium sources (influx and internal stores) and actin dynamics.
Main Results:
- Fibroblast contact induced intracellular calcium transients ([Ca2+]i) originating at cell-cell junctions.
- Cadherin binding initiated these calcium responses, dependent on both calcium influx and internal stores.
- Calcium signaling correlated with actin cytoskeleton remodeling and recruitment of junctional proteins (cadherin, beta-catenin).
Conclusions:
- Cadherin-mediated cell-cell adhesion in fibroblasts induces calcium transients.
- These calcium signals are essential for junctional protein recruitment and establishing strong cell-cell contacts via actin remodeling.