二甲双胍通过降低miR-34a抵抗心肌缺血再灌注损伤的刍议
2020-07-15邵海峰李强
邵海峰 李强
[摘要] 目的 分析二甲双胍通过降低miR-34a抵抗心肌缺血再灌注损伤的应用效果。方法 选择周龄6~8周的清洁级雄性SD大鼠60只作为研究对象,根据区组随机化法将其分成3个组别(参照组、手术组、二甲双胍组),其中参照组不对冠状动脉左前降支进行結扎,手术组在对冠状动脉左前降支结扎45 min后,再进行灌注,二甲双胍组在进行与手术组相同操作的同时,给予其二甲双胍,观察并对比3组SD大鼠的血清生化指标与miR-34a水平。 结果 二甲双胍组肌红蛋白、α羟丁酸脱氢酶、乳酸脱氢酶、肌酸激酶、肌酸激酶MB以及miR-34a数值分别为(99.02±24.78)ng/mL、(320.41±29.73)U/L、(327.83±30.74)U/L、(1 671.92±570.24)U/L、(626.31±227.72)U/L以及(5.16±0.44),明显优于参照组,差异有统计学意义(t=19.505,P=0.000;t=6.069,P=0.000;t=11.883,P=0.000;t=12.136,P=0.000;t=8.994,P=0.000;t=14.769,P=0.000)。结论 二甲双胍可有效调节miR-34a的表达,对于改善血清生化指标具有积极意义,可以控制心肌缺血再灌注损伤。
[关键词] 二甲双胍;心肌缺血;再灌注损伤;miR-34a;血清生化指标
[Abstract] Objective To analyze the effect of metformin on miR-34a resistance to myocardial ischemia-reperfusion injury. Methods Sixty clean male SD rats aged 6 to 8 weeks were selected as the research objects, and they were divided into three groups according to the block randomization method(reference group, surgery group, metformin group), in the reference group, the left anterior descending coronary artery was not ligated. In the surgery group, the left anterior descending coronary artery was ligated 45 minutes before reperfusion. The metformin group was given the same operation as the surgery group, and was given metformin. Serum biochemical indicators and miR-34a levels in SD rats were observed. Results The values of myoglobin, α-hydroxybutyrate dehydrogenase, lactate dehydrogenase, creatine kinase, creatine kinase MB and miR-34a in the metformin group were (99.02±24.78) ng/mL, (320.41±29.73) U/L, (327.83±30.74) U/L, (1 671.92±570.24) U/L, (626.31±227.72) U/L, and (5.16±0.44) were significantly better than the reference group with significant differences (t=19.505, P=0.000; t=6.069, P=0.000; t=11.883, P=0.000; t=12.136, P=0.000; t=8.994, P=0.000; t=14.769, P=0.000). Conclusion Metformin can effectively regulate the expression of miR-34a, has positive significance for improving serum biochemical parameters, can control myocardial ischemia-reperfusion injury, and is worthy of further research and promotion.
[Key words] Metformin; Myocardial ischemia; Reperf usion injury; miR-34a; Serum biochemical indicators
心血管病患者的致死原因之一为急性心肌梗死,其病症救治的关键在于梗死动脉的疏通与心肌血液供应的恢复,但是根据相关研究显示[1],心肌缺血情况得以恢复血流灌注时,会加重患者心肌损伤的严重性,极易引发患者发生心肌顿抑、心律失常以及心功能不全等并症状,即心肌缺血再灌注损伤。因此,在恢复患者冠状动脉血流通畅的同时,怎样避免心肌缺血再灌注损伤情况的发生,成为心血管疾病临床研究的热点[2]。近年来,随着医疗技术的不断发展,相关文献报道[3],miRNAs作为碱基组成的一种内源性非编码小RNA,能够对RNA降解起到促进效果,并可控制mRNA翻译,对于靶基因的表达具有调控作用。因此,该研究针对二甲双胍通过降低miR-34a抵抗心肌缺血再灌注损伤的应用效果进行分析,现报道如下。
1 对象与方法
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(收稿日期:2020-02-07)