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Ann Thorac Surg 2003;75:169-177
© 2003 The Society of Thoracic Surgeons

Original article: cardiovascular

Beneficial effect of autologous cell transplantation on infarcted heart function: comparison between bone marrow stromal cells and heart cells

Terrence M. Yau, MD, MSa, Shinji Tomita, MDa, Richard D. Weisel, MDa, Zhi-Qiang Jia, MDa, Laura C. Tumiati, MSb, Donald A.G. Mickle, MDb, Ren-Ke Li, MD, PhDa*

a Division of Cardiovascular Surgery, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada
b Department of Clinical Biochemistry, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada

* Address reprint requests to Dr Li, Toronto General Hospital, University Health Network, CCRW 1-815, 200 Elizabeth St, Toronto, ON M5G 2C4, Canada.
e-mail: renkeli{at}uhnres.utoronto.ca

Presented at the Thirty-eighth Annual Meeting of The Society of Thoracic Surgeons, Fort Lauderdale, FL, Jan 28–30, 2002.

BACKGROUND: Cell transplantation may restore function after myocardial infarction, but the optimal cell type remains controversial. We compared autologous bone marrow stromal cells (BMCs) with autologous heart cells (HCs) in a porcine myocardial infarction model.

METHODS: Yorkshire pigs underwent coil occlusion of the left anterior descending artery. Bone marrow stromal cells were obtained from sternal marrow and HCs were obtained by left ventricular biopsy, then cultured for 4 weeks. Four weeks after infarction, a 99mTc-sestamibi single-photon emission tomography (99mTc-MIBI SPECT) scan was performed and the pigs were then transplanted with BMCs (n = 7), HCs (n = 7), or culture medium (n = 14). Four weeks after transplantation, 99mTc-MIBI SPECT scanning was repeated to evaluate regional perfusion. Pressure-volume loops were constructed from micromanometer and conductance catheter data to evaluate left ventricular function. Hearts were evaluated histologically.

RESULTS: Bone marrow stromal cells and HCs engrafted within the infarct and assumed a myocyte morphology. SPECT MIBI scans showed increased perfusion in the infarct in cell-transplanted pigs, while perfusion decreased in the control pigs. Heart cell transplantation improved preload-recruitable stroke work and HC and BMC transplantation both shifted the end-systolic pressure–volume relation to the left. Both BMCs and HCs prevented thinning and expansion of the infarct region, and some BMCs differentiated into endothelial cells in newly formed blood vessels perfusing the infarct.

CONCLUSIONS: Both BMCs and HCs engrafted in the infarct region and improved let ventricular function by preventing infarct thinning. Bone marrow stromal cells demonstrated greater plasticity in vivo, and may offer a practical alternative to HC transplantation to restore function and perfusion after a myocardial infarction.




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