Mesenchymal Stem Cells Promote Matrix Metalloproteinase Secretion by Cardiac Fibroblasts and Reduce Cardiac Ventricular Fibrosis After Myocardial Infarction§

Authors


  • Author contributions: C.M.: Conception and design, collection and/or assembly of data, data analysis and interpretation, manuscript writing; O.L.: Collection and/or assembly of data, data analysis and interpretation; E.T.: Collection and/or assembly of data, data analysis and interpretation; J.R.: Conception and design; D. Calise: Collection and/or assembly of data, data analysis and interpretation; M.-H.S.: Collection and/or assembly of data; C.O.: Collection and/or assembly of data; M.-D.P.-M.: Collection and/or assembly of data; N.A.: Collection and/or assembly of data; A.N.S.: Collection and/or assembly of data; P.B.: Conception and design, provision of study material or patients; A.P.: Conception and design, data analysis and interpretation, manuscript writing, final approval of manuscript, financial support; D. Cussac: Conception and design, data analysis and interpretation, manuscript writing, final approval of manuscript.

  • Disclosure of potential conflicts of interest is found at the end of this article.

  • §

    First published online in STEM CELLS EXPRESS 2009.

Abstract

Recent studies showed that mesenchymal stem cells (MSCs) transplantation significantly decreased cardiac fibrosis; however, the mechanisms involved in these effects are still poorly understood. In this work, we investigated whether the antifibrotic properties of MSCs involve the regulation of matrix metalloproteinases (MMPs) and matrix metalloproteinase endogenous inhibitor (TIMP) production by cardiac fibroblasts. In vitro experiments showed that conditioned medium from MSCs decreased viability, α-smooth muscle actin expression, and collagen secretion of cardiac fibroblasts. These effects were concomitant with the stimulation of MMP-2/MMP-9 activities and membrane type 1 MMP expression. Experiments performed with fibroblasts from MMP2-knockout mice demonstrated that MMP-2 plays a preponderant role in preventing collagen accumulation upon incubation with conditioned medium from MSCs. We found that MSC-conditioned medium also decreased the expression of TIMP2 in cardiac fibroblasts. In vivo studies showed that intracardiac injection of MSCs in a rat model of postischemic heart failure induced a significant decrease in ventricular fibrosis. This effect was associated with the improvement of morphological and functional cardiac parameters. In conclusion, we showed that MSCs modulate the phenotype of cardiac fibroblasts and their ability to degrade extracellular matrix. These properties of MSCs open new perspectives for understanding the mechanisms of action of MSCs and anticipate their potential therapeutic or side effects. STEM CELLS 2009;27:2734–2743

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