Abstract:
:Type VI collagen is a nonfibrillar collagen present as a network throughout the chick secondary stroma. Immunolocalization of type VI collagen both in the chick corneal stroma and in other systems demonstrates that type VI collagen is present associated with cells and between striated fibrils. We hypothesize that type VI collagen may function in cell-matrix interactions important in corneal development. To examine this possibility, we have isolated and characterized bovine corneal type VI collagen and determined that the chain composition and morphology of type VI collagen isolated from cornea is similar to that isolated from other sources. The tissue form of type VI collagen was localized to filaments forming a network around fibrils and close to corneal fibroblasts. We then analyzed relative attachment and spreading on type VI collagen as compared to the other collagens present in the secondary stroma, and found that although corneal fibroblasts attach equally well to type VI and type I collagen, cells spread to a much greater extent on type VI collagen. Although corneal fibroblasts do have an RGD-dependent receptor which functions during adhesion to fibronectin, attachment to type VI collagen is RGD-independent unless the molecule is denatured. Blocking of the RGD-dependent receptor with soluble RGD peptides results in no change in attachment or spreading. These data imply a role for type VI collagen in cell-matrix interactions during corneal stroma development.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Doane KJ,Yang G,Birk DEdoi
10.1016/0014-4827(92)90200-rkeywords:
subject
Has Abstractpub_date
1992-06-01 00:00:00pages
490-9issue
2eissn
0014-4827issn
1090-2422journal_volume
200pub_type
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