title: Cyclophilin C-associated protein is a mediator for fibronectin fragment-induced matrix metalloproteinase-13 expression.
abstract: The function of cyclophilin C-associated protein (CyC-AP) on expression of extracellular matrix and matrix metalloproteinases (MMPs) was studied in CyC-AP-null mice. Fibronectin showed increased expression of the 53- and 29-kDa fragments in skin and wounds from CyC-AP-null mice. Type I collagen had an initial degraded pattern in the skin of CyC-AP-null mice, which did not occur in wild-type mice. MMP-3, MMP-13, MMP-14, and tumor necrosis factor-alpha (TNFalpha) had a higher expression in CyC-AP-null skin. During wound healing, MMP-13 and TNFalpha were stimulated to an even higher level, suggesting they are regulated by multiple factors. To understand the regulatory mechanisms of the up-regulated MMPs, the direct effects of TNFalpha, IL-1beta, 45-kDa fibronectin fragment (FN-45), and the 70-kDa fibronectin fragments (FN-70) on the expression of MMPs were studied. MMP-13 expression increased significantly in both CyC-AP-null and wild-type dermal fibroblasts after treatment with IL-1beta or with TNFalpha. However, MMP-13 expression did not increase in CyC-AP-null fibroblasts but did increase only in wild-type fibroblasts after FN-45 and FN-70 treatment. MMP-3 activation was induced by FN-45 and did not show a difference between CyC-AP-null and wild-type fibroblasts, suggesting different regulatory pathways for FN-45 on MMP-13 and MMP-3 expression. Our data are the first to demonstrate that deletion of CyC-AP can abolish fibronectin fragment-induced MMP-13 expression through an unknown mechanism. CyC-AP is an important factor for the regulation of MMP-13 expression.
authors.affiliation: Pediatric Surgical Research Laboratory, Stanford University School of Medicine, 257 Campus Drive, Stanford, CA 94305-5148, USA.
authors.forename: Wuyi
authors.initials: W
authors.lastname: Kong
authors.forename: Michael T
authors.initials: MT
authors.lastname: Longaker
authors.forename: H Peter
authors.initials: HP
authors.lastname: Lorenz
mesh_terms: D000818:Animals; D003094:Collagen / Q000737:chemistry; D017364:Collagenases / Q000096:biosynthesis* / Q000737:chemistry; D003470:Culture Media / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D004789:Enzyme Activation; D005347:Fibroblasts / Q000378:metabolism; D005353:Fibronectins / Q000737:chemistry*; D017353:Gene Deletion; D005786:Gene Expression Regulation; D015151:Immunoblotting; D016023:Integrins / Q000378:metabolism; D007375:Interleukin-1 / Q000378:metabolism; D053509:Matrix Metalloproteinase 13; D019278:Matrix Metalloproteinase 3 / Q000378:metabolism; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D015854:Up-Regulation; D014945:Wound Healing
chemical_list: D003470:Culture Media; D005353:Fibronectins; D016023:Integrins; D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha; D003094:Collagen; D017364:Collagenases; D053509:Matrix Metalloproteinase 13; D053504:Matrix Metalloproteinases, Membrane-Associated; D008666:Metalloendopeptidases; C507081:Mmp13 protein, mouse; D019278:Matrix Metalloproteinase 3