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Physiological variables affecting collagen lattice contraction by human dermal fibroblasts
H P Ehrlich1, D J Buttle, D H Bernanke
1Shriners Burns Institute, Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston 02114.
Experimental and Molecular Pathology
|April 1, 1989
Summary
Cell-mediated lattice contraction, a model for wound healing, requires energy, protein synthesis, and a cytoskeleton. Calcium-calmodulin interactions and microfilaments are crucial for this matrix compaction process.
Area of Science:
- Cell Biology
- Biochemistry
- Tissue Engineering
Background:
- Cell-mediated lattice contraction models pathological scar contracture.
- Fibroblast activity in collagen matrices is key to wound healing and scarring.
Purpose of the Study:
- To investigate the biochemical and cellular requirements for fibroblast-driven lattice contraction.
- To identify key molecular players and pathways involved in matrix compaction.
Main Methods:
- Culturing human dermal fibroblasts in collagen lattices.
- Assessing matrix compaction under varying conditions (serum concentration, energy substrates).
- Inhibiting specific cellular processes (DNA/protein synthesis, calcium transport, cytoskeleton dynamics) using chemical agents (W-7, cytochalasin B).
Main Results:
- Lattice contraction is promoted by fetal bovine serum and requires energy from glucose (anaerobic metabolism) or pyruvate (aerobic metabolism).
- Protein synthesis is essential, but DNA synthesis is not.
- Inhibition of calcium-calmodulin interactions (W-7) and microfilament disruption (cytochalasin B) completely blocks contraction.
- Microtubule activity is also necessary.
Conclusions:
- Cell-mediated lattice contraction is an energy-dependent process requiring protein synthesis and a functional cytoskeleton.
- Calcium-calmodulin signaling and microfilament integrity are critical for matrix compaction.
- Understanding these mechanisms provides insights into wound healing and scar formation.