聚酰胺—胺型树枝状高聚物纳米载体介导的组织因子反义寡脱氧核苷酸防治心肌缺血再灌注损伤机制的初步研究

目的研究聚酰胺—胺型树枝状高聚物(PAMAM-D)纳米载体介导组织因子(TF)反义寡脱氧核苷酸防治大鼠心肌缺血再灌注损伤的分子机制。方法分别设计合成针对大鼠TF的反义寡脱氧核苷酸(AS/TF)、正义寡脱氧核苷酸(S/TF)和错配寡脱氧核苷酸(Sc/TF),分别耦联于PAMAM-D纳米载体,构建ODN-PAMAM-D的聚合物。将100只雄性Lewis大鼠随机等分为假手术组、缺血再灌注组、AS/TF防治组、S/TF对照组和Sc/TF对照组。除假手术组和缺血再灌注组大鼠静脉分别注入生理盐水和PAMAM-D外,其余3组大鼠分别注入与PAMAM-D相耦联的相应寡核苷酸。各组大鼠于注射后10h开胸暴露心脏,除假手术组以外的其他4组大鼠于冠状动脉左前降支中1/2处结扎造成心肌缺血。心肌缺血90min后,解除结扎,再灌注3h。假手术组的大鼠于冠状动脉左前降支中1/2处只穿线,不结扎,持续4h 30min。分别于缺血90min和再灌注结束后取各组大鼠的血液检测肌钙蛋白T(TnT)和乳酸脱氢酶(LDH)的含量。并于实验结束后取梗死区及边缘区心肌组织检测TF基因的转录、TF的促凝活性(TF:C)和TF的抗原含量(TF:Ag)以及活性氧簇(ROS)、蛋白酶激活受体-1(PAR-1)和p38有丝分裂原激活蛋白激酶(p38MAPK)的表达。结果心肌缺血90min及再灌注3h后,缺血再灌注组大鼠血液中的TnT和LDH含量均显著高于假手术组,而AS/TF防治组均明显低于其他3个缺血再灌注组(P<0.05);梗死区及边缘区心肌组织中TF基因的转录和表达均强于假手术组,AS/TF防治组则较其他3个缺血再灌注组明显减弱(P<0.01)。流式细胞学检测显示,心肌缺血再灌注3h后,各缺血再灌注组大鼠心肌组织中ROS、PAR-1和p38 MAPK的表达均显著增多,AS/TF防治组则明显低于缺血再灌注组、S/TF对照组和Sc/TF对照组(P<0.05)。结论 TF不仅介导了凝血过程,而且通过激活PAR-1和p38 MAPK诱发了炎性反应,从而加重了心肌组织损伤。TF是心肌缺血再灌注损伤的"中心分子",针对TF的反义寡脱氧核苷酸耦联G10代PAMAM-D纳米载体不仅抑制了TF的转录和表达,而且减轻了心肌缺血再灌注损伤。

Preliminary research on the mechanism of polyamidoamine dendrimers nanometer vector mediated antisense oligodeoxynucleotide against tissue factor improving myocardial ischemia-reperfusion injury

Objective To investigate the possible mechanism of polyamidoamine dendrimers(PAMAM-D) mediated antisense oligodeoxynucleotide against tissue factor(TF) improving myocardial ischemia reperfusion injury.Methods Antisense oligodeoxynucleotide(AS/TF),sense oligodeoxynucleotide(S/TF) and scrambled oligodeoxynucleotide against TF (Sc/TF) were designed and synthesized respectively,and then were coupled with PAMAM-D nanometer vector to establish ODN PAMAM D polymers.100 male Lewis rats were randomly divided into sh...