Activation of MMP-2 in response to vascular injury is mediated by phosphatidylinositol 3-kinase-dependent expression of MT1-MMP

• Published in: American journal of physiology. Heart and circulatory physiology 2004-12, Vol.287 (6), p.H2861-H2870
• Main Authors: Zahradka, Peter, Harding, Greg, Litchie, Brenda, Thomas, Shawn, Werner, Jeffrey P, Wilson, David P, Yurkova, Natalia
• Format: Article
• Language: English
• Subjects: Androstadienes - pharmacology; Angioplasty, Balloon, Coronary - adverse effects; Animals; Cell Movement - physiology; Chromones - pharmacology; Coronary Vessels - cytology; Coronary Vessels - enzymology; Coronary Vessels - injuries; Enzyme Inhibitors - pharmacology; Hyperplasia; Matrix Metalloproteinase 2 - metabolism; Matrix Metalloproteinases, Membrane-Associated; Metalloendopeptidases - metabolism; Morpholines - pharmacology; Muscle, Smooth, Vascular - cytology; Muscle, Smooth, Vascular - enzymology; Muscle, Smooth, Vascular - injuries; Organ Culture Techniques; Phosphatidylinositol 3-Kinases - metabolism; Phosphodiesterase Inhibitors - pharmacology; Swine; Tunica Intima - cytology; Tunica Intima - metabolism
• ISSN: 0363-6135; 1522-1539
• DOI: 10.1152/ajpheart.00230.2004

Departments of 1 Physiology and 2 Surgery, University of Manitoba, and 3 lnstitute of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, Winnipeg, Manitoba, Canada R2H 2A6 Submitted 8 March 2004 ; accepted in final form 23 July 2004 Phosphatidylinositol 3-kinase (PI3K) is required for smooth muscle cell (SMC) proliferation. This study reports that inhibitors of PI3K also prevent SMC migration and block neointimal hyperplasia in an organ culture model of restenosis. Inhibition of neointimal formation by LY-294002 was concentration and time dependent, with 10 µM yielding the maximal effect. Continuous exposure for at least the first 4–7 days of culture was essential for significant inhibition. To assess the role of matrix metalloproteinases (MMPs) in this process, we monitored MMP secretion by injured vessels in culture. Treatment with LY-294002 selectively reduced active MMP-2 in media samples according to zymography and Western blot analysis without concomitant changes in latent MMP-2. Parallel results with wortmannin indicate that MMP-2 activation is PI3K dependent. Previous research has shown a role for both furin and membrane-type 1 (MT1)-MMP (MMP-14) in the activation of MMP-2. The furin inhibitor decanoyl-Arg-Val-Lys-Arg-chloromethylketone did not prevent MMP-2 activation after balloon angioplasty. In contrast, balloon angioplasty induced a significant increase in the levels of MT1-MMP, which was suppressed by LY-294002. No change in MT1-MMP mRNA was observed with LY-294002, because equivalent amounts of this mRNA were present in both injured and noninjured vessels. These results implicate PI3K-dependent regulation of MT1-MMP protein synthesis and subsequent activation of latent MMP-2 as critical events in neointimal hyperplasia after vascular injury. matrix metalloproteinase; LY-294002; wortmannin; furin; restenosis Address for reprint requests and other correspondence: P. Zahradka, Institute of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, Winnipeg, Manitoba, Canada R2H 2A6 (E-mail: peterz{at}sbrc.umanitoba.ca )