Influence of Transplantation of Allogenic Bone Marrow Mononuclear Cells on the Left Ventricular Remodeling of Rat after Acute Myocardial Infarction

To probe into the influence of transplantation of allogenic bone marrow mononuclear cells （BM-MNCs） on the left ventricular remodeling of rat after acute myocardial infarction （AMI）, 60 male Wistar rats were evenly divided into three groups at random： control group 1, control group 2 and transplantation group. In control group 1, chest was opened without ligation of coronary artery; in control group 2 and transplantation group, the left anterior descending branch of coronary artery was ligated to establish AMI model. Prepared culture medium and allogenic BM-MNCs suspension were respectively implanted the surrounding area of infracted cardiac muscle via epicardium of control group 2 and transplantation group. Four weeks after the operation, the osteopontin gene （OPN mRNA, P〈0.01）, type Ⅰ collagen （P〈0.01） and angiotensin Ⅱ （AngⅡ, P〈0.01） content in the left ventricular non-infracted myocardium, and the Ang Ⅱ density in blood plasma （P〈0.05） of transplantation group and control group 2 were all significantly higher than that of control group Ⅰ. In the transplantation group, the myocardial OPN InRNA, type Ⅰ collagen and Ang Ⅱ content of non-infracted zone in left ventricle, and the Ang Ⅱ concentration in blood plasma were all significantly lower than those of control group 2 （P〈0.05 for all）. It is concluded that allogenic BM-MNCs transplantation may ease left ventricular remodeling after AMI by inhibiting the synthesis of type Ⅰ collagen in the cardiac muscle and down-regulating the expression of Ang Ⅱ and OPN gene.