In vitrofibroplasia: Matrix contraction, cell growth, and collagen production of fibroblasts cultured in fibrin gels

TL Tuan, A Song, S Chang, S Younai… - Experimental cell research, 1996 - Elsevier
TL Tuan, A Song, S Chang, S Younai, ME Nimni
Experimental cell research, 1996Elsevier
Extracellular matrix (ECM) reorganization, cell growth, and collagen synthesis/deposition
are key features of fibroplasia during tissue repair. Anin vitrofibrin gel culture model system
simulating fibroplasia of wound repair was characterized. In the model system, fibrin gels
were stabilized on plastic culture plates as hemispheres. In this way, fibroblasts were able to
reorganize fibrin fibrils, resulting in a measurable decrease in gel thickness with no change
in gel diameter, thereby producing a matrix with tension relevant to that of a repairing tissue …
Extracellular matrix (ECM) reorganization, cell growth, and collagen synthesis/deposition are key features of fibroplasia during tissue repair. Anin vitrofibrin gel culture model system simulating fibroplasia of wound repair was characterized. In the model system, fibrin gels were stabilized on plastic culture plates as hemispheres. In this way, fibroblasts were able to reorganize fibrin fibrils, resulting in a measurable decrease in gel thickness with no change in gel diameter, thereby producing a matrix with tension relevant to that of a repairing tissue. Within the study period, human dermal fibroblasts exhibited dynamic activities in cell growth and in reorganization and remodeling of the fibrin matrix. In the first 2 days of culture, fibroblasts quickly reorganized the fibrin matrix to 10% of its original thickness. Fibroblast proliferation occurred in the contracted fibrin gels and proceeded at a much slower rate compared to monolayer cultures. Proliferation continued at the same rate throughout the study in contrast to monolayer cultures, which ceased proliferation at confluence. Collagen synthesis was detected as early as the second day in culture. Type I collagen was the major collagen synthesized by fibroblasts with small amounts of type V and type III collagen. Collagen from either monolayer or fibrin gel cultures appeared identical when analyzed by two-dimensional peptide mapping of their CNBr fragments. Although collagen was detected biochemically from Day 2, organized collagen fibrils were apparent only in the later stage of cultures in transmission electron micrographs. Also, at this time, fibrin fibrils were largely removed and the matrix was filled with collagen fibrils and other filamentous ECM. The growth factor TGF-β stimulated both fibrin gel contraction and collagen synthesis by fibroblasts. Therefore, using the model system, we have demonstrated that fibroblasts can actively reorganize the fibrin matrix and subsequently remodel it into a collagen-containing scar-like tissue. The unique features of this model system allow for creative designs in studying the complex mechanisms underlying tissue repair.
Elsevier