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From the Department of Cardiology and Angiology (K.G., I.F., M.L., E.A., H.D., B.S.), Medical School Hannover, Germany; Laboratory of Host Defenses (S.M.H.), National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md.
Correspondence to Bernhard Schieffer, MD, Abteilung Kardiologie und Angiologie, Medizinische Hochschule Hannover, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany. E-mail Schieffer.Bernhard{at}mh-hannover.de
Mechanical stretch is a hallmark of arterial hypertension and leads to vessel wall remodeling, which involves matrix metalloproteinases (MMPs). Because mechanical stretch is further capable of inducing reactive oxygen species (ROS) formation via the NAD(P)H oxidase, we assessed whether mechanical stretch enhances MMP expression and activity in a NAD(P)H oxidasedependent manner. Therefore, vascular smooth muscle cells (VSMCs) isolated from C57BL/6 mice were exposed to cyclic mechanical stretch. The impact of ROS was assessed using VSMCs isolated from p47phox-/- mice, deficient for a NAD(P)H oxidase subunit responsible for ROS formation. Transcript levels were investigated by cDNA array and confirmed by RT-PCR. ROS formation was determined by DCF fluoroscopy and MMP-2 activity by zymography. Mechanical stretch of wild-type VSMCs resulted in a rapid ROS formation and p47phox membrane translocation that is followed by an increase in Nox-1 transcripts. ROS formation was completely abrogated in p47phox-/- VSMCs. cDNA array further revealed an increase of MMP-2 mRNA in response to mechanical stretch, which was validated by RT-PCR. Using p47phox-/- VSMCs, this increase in MMP-2 mRNA was completely blunted. mRNA expression of tissue inhibitor of MMP-2 TIMP-1 and TIMP-2 and membrane-type 1 MMP was unaffected by mechanical stretch. Gelatinolytic activity of pro-MMP-2 has been increased rapidly in wild-type VSMCs and was completely abolished in p47phox-/- VSMCs. These results indicate that mechanical stretch induces ROS formation via the NAD(P)H oxidase and thereby enhances MMP-2 mRNA expression and pro-MMP-2 release. These results are consistent with the notion that in arterial hypertension, reactive oxygen species are involved in vascular remodeling via MMP activation. The full text of this article is available online at http://www.circresaha.org.
Key Words: mechanical stretch reactive oxygen species NAD(P)H oxidase p47phox matrix metalloproteinases
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