The Potential of Adipose Derived Stem Cells for Myocardial Regenerative Therapy.

摘要

Background: Cell therapy using Human Bone Marrow Stem Cells (HBMSCs) has been shown to improve heart function after a myocardial infarction. The harvesting technique involved with bone marrow stem cells is invasive and yields a low cell number. There is now an increasing interest in Human Adipose Derived Stem Cells (HADSCs) as they are abundant and readily accessible from liposuction material. The present study was undertaken to investigate if HADSCs are superior than HBMSCs in myocardial regenerative therapy.;Conclusion: The data suggest that HADSCs may prove to be a more ideal alternative for regenerative therapy in the future.;Results: Both HADSCs and HBMSCs proliferated in a time dependent manner, however, the proliferative ability of HADSC was greater than HBMSCs. In addition, both cells differentiated to the osteoblast lineage confirming their multipotency when treated with induction medium. Furthermore, treatment of both cells with 5--AC resulted in positive immunostaining of cardiac markers, troponinI and connexin 43, however the expression of these markers was enhanced in HADSCs. This was further confirmed by western blot analysis, however 5--AC treatment did not exhibit cell contraction or multinucleation. In addition, these results were further confirmed by our in vivo study. Both cells were injected in the heart of a rat model of myocardial infarction and was monitored for ejection fraction (EF) and fractional shortening (FS) for 24 hours, 3 weeks and 6 weeks post-surgery. The cardiac function of the rats treated with stem cells was improved as demonstrated by increase in EF and FS, however, a greater improvement was seen with HADSCs compared with HBMSCs. This notion is further substantiated by our studies on left 10 ventricular infarct size measurement, showing that HADSC are more potent in reduction of the infarct compared to HBMSCs.