Tailoring Collagen to Engineer the Cellular Microenvironment
Abstract
Collagen is the most abundant protein in the extracellular matrix (ECM), and it can direct the behavior of the neighboring cells. By customizing properties of collagen, it is possible to control the cells that interact with it. Utilizing a bottom-up strategy, modular gene fragments are assembled and recombinantly processed to create collagen-mimetic variants that modulate proteolytic degradation, cell adhesion, and mechanical characteristics. The removal of the native MMP cleavage site results in MMP-1 resistant collagen. By introducing additional MMP-susceptible sequences, the degradation characteristics of collagen molecules are modified. Additional non-native functionality is also introduced into the collagen, including the IKVAV sequence, which has been implicated in neurite outgrowth. This mutation, which disrupts the Gly-X-Y tripeptide repeat of collagen, does not prevent the formation of triple-helical collagen. Non-native cysteines and the integrin binding sequence GFOGER are combined in the collagen, and encapsulation of normal human lung fibroblasts within collagen hydrogels are tested. Cells remain spherical, when encapsulated within hydrogels of collagen variants in which the native integrin binding sites are remove...Continue Reading
References
Use of synthetic peptides to locate novel integrin alpha2beta1-binding motifs in human collagen III.
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