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Biological pacemaking has been performed with viral vectors, human embryonic stem cells, and adult human mesenchymal stem cells (hMSCs) as delivery systems. Only with human embryonic stem cells are data available regarding stability for &gt;2 to 3 weeks, and here, immunosuppression has been used to facilitate survival of xenografts. The purpose of the present study was to determine whether hMSCs provide stable impulse initiation over 6 weeks without the use of immunosuppression, the "dose" of hMSCs that ensures function over this period, and the catecholamine responsiveness of hMSC-packaged pacemakers.

Xenografted Adult Human Mesenchymal Stem Cells Provide a Platform for Sustained Biological Pacemaker Function in Canine Heart