AIM: As the capability of human mesenchymal stem cells (hMSC) to engraft, differentiate and improve myocardial function cannot be studied in humans, exploration was performed in a xenomodel. METHODS: The rats were divided into three groups depending on the type of rats used (Rowett nude (RNU) or Fischer rats +/- immunosuppression). Different groups were treated with intramyocardial injection of hMSC (1-2 million) either directly or three days after ligation of the left anterior descending artery (LAD). Myocardial function was investigated by echocardiography. The hMSC were identified with fluorescence in situ hybridization and myocardial differentiation was assessed by immunohistochemistry. RESULTS: When hMSC were injected directly after LAD ligation they could be identified in half (8/16) of the RNU rats (without immunosuppression) at 4 weeks. When injected 3 days after LAD ligation in immunosuppressed RNU rats they were identified in all (6/6) rats at 6 weeks. The surviving hMSC showed signs of differentiation into fibroblasts. No cardiomyocyte differentiation was observed. There was no difference in myocardial function in treated animals compared to controls. CONCLUSIONS: The hMSC survived in this xenomodel up to 6 weeks. However, hMSC required implantation into immunoincompetent animals as well as immunosuppression to survive, indicating that these cells are otherwise rejected. Furthermore, these cells did not differentiate into cardiomyocytes nor did they improve heart function in this xenomodel.
AIM: As the capability of human mesenchymal stem cells (hMSC) to engraft, differentiate and improve myocardial function cannot be studied in humans, exploration was performed in a xenomodel. METHODS: The rats were divided into three groups depending on the type of rats used (Rowett nude (RNU) or Fischer rats +/- immunosuppression). Different groups were treated with intramyocardial injection of hMSC (1-2 million) either directly or three days after ligation of the left anterior descending artery (LAD). Myocardial function was investigated by echocardiography. The hMSC were identified with fluorescence in situ hybridization and myocardial differentiation was assessed by immunohistochemistry. RESULTS: When hMSC were injected directly after LAD ligation they could be identified in half (8/16) of the RNUrats (without immunosuppression) at 4 weeks. When injected 3 days after LAD ligation in immunosuppressed RNUrats they were identified in all (6/6) rats at 6 weeks. The surviving hMSC showed signs of differentiation into fibroblasts. No cardiomyocyte differentiation was observed. There was no difference in myocardial function in treated animals compared to controls. CONCLUSIONS: The hMSC survived in this xenomodel up to 6 weeks. However, hMSC required implantation into immunoincompetent animals as well as immunosuppression to survive, indicating that these cells are otherwise rejected. Furthermore, these cells did not differentiate into cardiomyocytes nor did they improve heart function in this xenomodel.
Authors: David L Simpson; Nolan L Boyd; Sunjay Kaushal; Steve L Stice; Samuel C Dudley Journal: Biotechnol Bioeng Date: 2011-09-02 Impact factor: 4.530
Authors: Johan Lundberg; Katarina Le Blanc; Mikael Söderman; Tommy Andersson; Staffan Holmin Journal: Neuroradiology Date: 2009-06-27 Impact factor: 2.804
Authors: Shera Lilyanna; Eliana C Martinez; Thang D Vu; Lieng H Ling; Shu U Gan; Ai L Tan; Thang T Phan; Theo Kofidis Journal: Tissue Eng Part A Date: 2013-02-28 Impact factor: 3.845