Stem cells for clinical use in cardiovascular medicine

Philippe Menasché

doi:10.1160/TH05-03-0218

Thrombosis and Haemostasis, Inhaltsverzeichnis

Thromb Haemost 2005; 94(04): 697-701
DOI: 10.1160/TH05-03-0218

Theme Issue Article

Schattauer GmbH

Stem cells for clinical use in cardiovascular medicine

Current limitations and future perspectives

Philippe Menasché

¹Hôpital Européen Georges Pompidou, Department of Cardiovascular Surgery; University of Paris, Faculty of Medicine; INSERM U 633, Paris, France

› Institutsangaben

Abstract

Summary

Cell transplantation is currently gaining a growing interest as a potential new means of improving the prognosis of patients with cardiac failure. The basic assumption is that left ventricular dysfunction is largely due to the loss of a critical number of cardiomyocytes and that it can be partly reversed by implantation of new contractile cells into the postinfarction scars. Primarily for practical reasons, autologous skeletal myoblasts have been the first to undergo clinical trials and now that the feasibility of the procedure is well established, efficacy data are expected from the ongoing randomized studies. Bone marrow stem cells are also generating a great deal of interest, particularly in patients with acute myocardial infarction, and are currently undergoing extensive clinical testing although recent data have raised a cautionary note about the transdifferentiation potential of these cells. While experimental studies and early-phase clinical trials tend to support the concept that cell therapy may enhance cardiac repair, several key issues still need to be addressed including (1) the optimal type of donor cells in relation to the clinical profile of the patients, (2) the mechanism by which cell engraftment improves cardiac function, (3) the optimization of cell survival, (4) the development of less invasive cell delivery techniques and (5) the potential benefits of cell transplantation in nonischemic heart failure. Current evidence suggests, however, that adult stem cells (myogenic or marrow-derived) fail to electromechanically integrate within the recipient heart, thereby mandating the search for second generation cell types able to achieve this goal which is the prerequisite for an effective enhancement of contractile function. Preliminary data suggest that cells that feature a true cardiomyogenic phenotype such as cardiac stem cells and cardiac-precommitted embryonic stem cells may fall in this category and carry the potential for ensuring a true regeneration of dead myocardium.

Keywords

Stem cells - myocardial infarction - heart failure - skeletal myoblasts - bone marrow - embryonic stem cells

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Referenzen

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