Matrix metalloproteinases and tissue inhibitors of metalloproteinases in coxsackievirus-induced myocarditis

Cardiovascular Pathology : the Official Journal of the Society for Cardiovascular Pathology
Caroline CheungBruce M McManus

Abstract

Coxsackievirus B3 (CVB3) is the major causative agent of myocarditis in humans. In the mouse model, the inflammatory phase of myocarditis results in extensive damage to the heart and triggers profound extracellular matrix (ECM) remodeling, which may ultimately lead to dilated cardiomyopathy. Matrix metalloproteinases (MMPs) are regulators of the ECM and can degrade all the components in the matrix. Adolescent male mice were infected with cardiovirulent CVB3 and sacrificed at 3, 9, and 30 days post infection (pi). Transcription of MMP-2, MMP-9, and MMP-12 was assessed by reverse-transcriptase polymerase chain reaction (RT-PCR). Protein expression of these enzymes was examined using immunohistochemistry, and the activation status of MMP-2 and MMP-9 was assessed using gelatin zymography. Tissue inhibitors of metalloproteinases (TIMPs) were analyzed using immunoblotting assays. Myocarditic hearts were also stained with picrosirius red and viewed under polarizing light to examine the collagen network. MMP-2, MMP-9, and MMP-12 transcription was increased at 9 days pi, as determined by RT-PCR. Immunohistochemistry confirmed an increase in translation of these MMP species, and zymographic analysis further showed elevated activation of ...Continue Reading

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