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Current Topics in Peptide & Protein Research   Volumes    Volume 16 
Cryptic activity within the Type III1 domain of fibronectin regulates tissue inflammation and angiogenesis
Christina Cho, Rhiannon Kelsh-Lasher, Anthony Ambesi, Paula J. McKeown-Longo
Pages: 37 - 47
Number of pages: 11
Current Topics in Peptide & Protein Research
Volume 16 

Copyright © 2015 Research Trends. All rights reserved

The fibronectin matrix provides mechanical and biochemical information to regulate homeostatic and pathological processes within tissues. Fibronectin consists of independently-folded modules termed Types I, II and III. In response to cellular contractile force, Type III domains unfold to initiate a series of homophilic binding events which result in the assembly of a complex network of intertwining fibrils. The unfolding of Type III modules provides elasticity to the assembled fibronectin matrix allowing it to function as a dynamic scaffold which provides binding sites for cellular receptors, growth factors and other matrix molecules. Access to bioactive sites within the fibronectin matrix is under complex regulation and controlled through a combination of mechanical and proteolytic activity. Mechanical unfolding of Type III modules and limited proteolysis can alter the topographical display of bioactive sites within the fibronectin fibrils by exposing previously cryptic sites and disrupting functional sites. In this review we will discuss cryptic activity found within the first Type III module of fibronectin and its impact on tissue angiogenesis and inflammation.
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