TY - JOUR
T1 - The structural basis of functional improvement in response to human umbilical cord blood stem cell transplantation in hearts with postinfarct lv remodeling
AU - Chen, Yong
AU - Ye, Lei
AU - Zhong, Jia
AU - Li, Xin
AU - Yan, Chen
AU - Chandler, Margaret P.
AU - Calvin, Steve
AU - Xiao, Feng
AU - Negia, Mesfin
AU - Chen, Walter C.Low
AU - Zhang, Jianyi
AU - Yu, Xin
N1 - Publisher Copyright:
Copyright © 2015 Cognizant Comm. Corp.
PY - 2015
Y1 - 2015
N2 - Cellular therapy for myocardial repair has been one of the most intensely investigated interventional strategies for acute myocardial infarction. Although the therapeutic potential of stem cells has been demonstrated in various studies, the underlying mechanisms for such improvements are poorly understood. In the present study, we investigated the long-term effects of stem cell therapy on both myocardial fiber organization and regional contractile function using a rat model of postinfarct remodeling. Human nonhematopoietic umbilical cord blood stem cells (nh-UCBSCs) were administered via tail vein to rats 2 days after infarct surgery. Animals were maintained without immunosuppressive therapy. In vivo and ex vivo MR imaging was performed on infarct hearts 10 months after cell transplantation. Compared to the age-matched rats exposed to the identical surgery, both global and regional cardiac functions of the nh-UCBSC-treated hearts, such as ejection fraction, ventricular strain, and torsion, were significantly improved. More importantly, the treated hearts exhibited preserved fiber orientation and water diffusivities that were similar to those in sham-operated control hearts. These data provide the first evidence that nh-UCBSC treatment may prevent/delay untoward structural remodeling in postinfarct hearts, which supports the improved LV function observed in vivo in the absence of immunosuppression, suggesting a beneficial paracrine effect occurred with the cellular therapy.
AB - Cellular therapy for myocardial repair has been one of the most intensely investigated interventional strategies for acute myocardial infarction. Although the therapeutic potential of stem cells has been demonstrated in various studies, the underlying mechanisms for such improvements are poorly understood. In the present study, we investigated the long-term effects of stem cell therapy on both myocardial fiber organization and regional contractile function using a rat model of postinfarct remodeling. Human nonhematopoietic umbilical cord blood stem cells (nh-UCBSCs) were administered via tail vein to rats 2 days after infarct surgery. Animals were maintained without immunosuppressive therapy. In vivo and ex vivo MR imaging was performed on infarct hearts 10 months after cell transplantation. Compared to the age-matched rats exposed to the identical surgery, both global and regional cardiac functions of the nh-UCBSC-treated hearts, such as ejection fraction, ventricular strain, and torsion, were significantly improved. More importantly, the treated hearts exhibited preserved fiber orientation and water diffusivities that were similar to those in sham-operated control hearts. These data provide the first evidence that nh-UCBSC treatment may prevent/delay untoward structural remodeling in postinfarct hearts, which supports the improved LV function observed in vivo in the absence of immunosuppression, suggesting a beneficial paracrine effect occurred with the cellular therapy.
KW - Diffusion tensor mr imaging
KW - Displacement encoding
KW - Fiber architecture
KW - Ischemic heart injury
KW - Myocardial wall strain
KW - Umbilical cord blood stem cells
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U2 - 10.3727/096368913X675746
DO - 10.3727/096368913X675746
M3 - Article
C2 - 24332083
AN - SCOPUS:85017315512
SN - 0963-6897
VL - 24
SP - 971-983,
JO - Cell transplantation
JF - Cell transplantation
IS - 6
ER -
