Abstract
In the compensatory state of human left ventricular hypertrophy (LVH), the remodeling processes in the extracellular matrix and the role of calcineurin (Cn) are not completely understood. The present work aimed to analyze the expression and activity of matrix metalloproteinases (MMPs), their endogenous inhibitors (TIMPs), and of Cn in patients with compensated LVH. By semiquantitative RT-PCR, Western blotting, and gelatine zymography, we determined mRNA, protein, and/or enzyme activity levels of MMPs, TIMPs, atrial natriuretic peptide (ANP), Cn subunits, and of the modulatory calcineurin-interacting protein (MCIP) 1. Myocardial samples from patients showing severe aortic stenosis, normal ejection fraction, and compensated LVH were compared with autopsy samples from healthy hearts. LVH patients showed upregulation of CnA-β mRNA but downregulation of both CnB-α mRNA and protein. Total Cn activity (as determined through NF-AT phosphorylation and MCIP1 mRNA expression) was unchanged. There were no differences in gene expression and activities of MMP-2, MMP-9, and of TIMPs 1–4 between LVH patients and controls. As expected, ANP mRNA expression was high in LVH patients. We propose a prominent role for CnB in controlling Cn activity in compensated LVH. At this stage of the disease, MMP and TIMP activities are balanced.
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Acknowledgments
This work has been supported by the Commission for Clinical Research at the Technical University of Munich (KKF H 10-01), Munich, Germany. Expert technical assistance from Angelika Bernhard-Abt is kindly acknowledged.
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Drs. Grammer and Bleiziffer contributed equally to the study
Returned for 1st revision: 23 February 2006 1. revision received: 8 April 2006
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Grammer, J.B., Bleiziffer, S., Monticelli, F. et al. Calcineurin and matrix protein expression in cardiac hypertrophy. Basic Res Cardiol 101, 292–300 (2006). https://doi.org/10.1007/s00395-006-0598-z
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DOI: https://doi.org/10.1007/s00395-006-0598-z