Objective To evaluate the feasibility of constructing tissue engineering cardiac patch with photooxidationfixed acellular bovine pericardium.Methods Fresh bovine pericardia were treated by dye-mediated photooxidation after decellularization.Some of them were seeded with bone marrow stromal cells(MSCs) isolated from male SD rats to construct cardiac patches.Myocardial infarction(MI) model was made in female SD rats by left anterior descending coronary ligation(LAD).One week later, the confirmed MI rats were divided into three groups randomly, group MI (n = 15)without any treatment; group P (n = 18) with photooxidated pericardia implantation ; group P + C (n = 18) with seeded pericardia implantation.A sham group (n = 10) was also performed with opening and closing chest twice only.The heart were explanted at 2 or 4 weeks after implantation, and examined histologically and immunohistochemically.The heart function was evaluated by echocardiography at 4 weeks before excising the rats.Results There were no cells or cell debris remained in bovine pericardium tissue.The fiber structure became condensed after photooxidation.The seeded cells formed a continuous layer on the surface of the tissue.The pericardial degradation level and newly formed microvessel density were larger in group P + C than in group P after 2 [ (13.7 ±5.2)个/mm2 vs (7.1 ±3.1)个/mm2, P＜0.05]and4 [(22.6 ±4.9)个/mrn2 vs (14.1 ±5.3)个/mm2, P＜0.05]weeks.Four weeks after transplantation, cardiac echocardiography showed left ventricular ejection fraction(LVEF) was lower in group MI (44.8 ± 4.4) ％ and group P (48.4 ± 5.0) ％ compared with group P + C (49.3 ± 4.8) ％, left ventricular fractional shorterning(LVFS) was lower in group MI (18.0 ± 2.2) ％ and group P (19.8 ± 2.5) ％ compared with group P + C (20.4 ±2.5) ％, the difference between P + C and MI was significant.Conclusion Transplantation of the tissue engineered bovine pericardial patches with dye-mediated photooxidation can improve heart function in MI rats.This kind of patches demonstrates a promising prospect in the future.%目的 探讨经染料介导光氧化处理的脱细胞牛心包构建组织工程心肌补片的可行性。方法 新鲜牛心包先脱细胞，再经光氧化法处理，消毒后种植雄性SD骨髓间充质干细胞(MSCs)。结扎雌性大鼠左冠状动脉前降支，制作心肌梗死模型，1周后将符合心肌梗死标准的大鼠随机分成3组，心肌梗死对照组(MI)、补片组(P)、种细胞补片组(P+C)分别进行干预。4周后，超声评价心功能；2周、4周取材行组织学和免疫组化检查。结果 脱细胞处理完全去除了牛心包组织中的细胞，光氧化处理使组织结构致密；种植的细胞在组织表面形成连续的细胞层。P+C组牛心包心肌补片降解程度、微血管密度在2周、4周时均较P组大。超声评价补片4周后大鼠心功能，P+C组左室射血分数(LVEF)、左室缩短分数(LVFS)均较MI组和P组大，与MI组的差异有统计学意义。结论 光氧化处理脱细胞牛心包构建的组织工程心肌补片可以延缓心功能恶化，该处理方法具有良好的应用潜力。
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