突触后支架蛋白Preso在颅脑冲击伤诱导创伤后应激障碍中的作用机制

Role mechanism of the postsynaptic scaffold protein Preso in the induction of post-traumatic stress disorder by blast traumatic brain injury

将36只雄性C57小鼠随机分为对照组(Sham组)、3.5 MPa颅脑冲击伤(blast-related traumatic brain injury,bTBI)组、4.5 MPa bTBI组、5.5 MPa bTBI组、4.5 MPa bTBI+生理盐水组(bTBI+SA组)、4.5 MPa bTBI+小分子多肽组(bTBI+TAT-FERM组),每组6只;将12只Preso^(-/-)小鼠随机分为Sham组和4.5 MPa bTBI组,每组6只。对小鼠进行bTBI造模,完成后常规饲养2周,4.5 MPa bTBI+生理盐水组和4.5 MPa bTBI+TAT-FERM组在bTBI造模后每天通过尾静脉给药1次,连续给药5 d。与对照组相比,3.5 MPa bTBI组小鼠焦虑抑郁行为改变不显著;4.5 MPa bTBI和5.5 MPa bTBI组小鼠出现创伤后应激障碍(posttraumatic stress disorder,PTSD)样症状。与对照组相比,4.5 MPa bTBI组Preso/mGluR1复合体形成增加,使用TAT-FERM可阻断Preso与mGluR1的相互作用,可在不改变Preso/mGluR1复合体组成分子蛋白表达的情况下抑制Preso/mGluR1复合体形成,并且改善bTBI所导致的PTSD症状。bTBI促进Preso/mGluR1复合体形成是bTBI诱致PTSD症状的重要分子病理机制,通过阻断Preso与mGluR1相互作用可减轻bTBI对PTSD的影响,进而为治疗bTBI相关的PTSD提供了潜在靶点。

To investigate the mechanism of post-synaptic scaffold protein Preso in the exacerbation of post-traumatic stress disorder(PTSD)by blast-related traumatic brain injury(bTBI),thirty-six male C57 mice were randomly divided into the control group(Sham group),3.5 MPa bTBI group,4.5 MPa bTBI group,5.5 MPa bTBI group,4.5 MPa bTBI+saline group,4.5 MPa bTBI+small molecule interfering peptide(TAT-FERM)group,and 6 mice in each group.And twelve Preso^(-/-)mice were randomly divided into sham group and 4.5 MPa bTBI group,with 6 mice in each group.The mice were subjected to bTBI modelling and were routinely kept for 2 weeks after completion.4.5 MPa bTBI+saline group and 4.5 MPa bTBI+TAT-FERM group were administered once a day through the tail vein for 5 consecutive days after bTBI modelling.Compared with the control group,the anxiety and depression behavior of 3.5 MPa bTBI mice was not significantly changed.Mice in the 4.5 MPa bTBI and 5.5 MPa bTBI groups showed significant PTSD symptoms and promoted the formation of the Preso/mGluR1 complex.The use of TAT-FERM blocked the interaction between Preso and mGluR1,inhibited the formation of Preso/mGluR1 complex without altering the expression of Preso/mGluR1 complex component proteins,and ameliorated PTSD symptoms caused by bTBI.Results display that the promotion of Preso/mGluR1 complex formation by bTBI is an important molecular pathological mechanism by which bTBI induces PTSD symptoms.The effect of bTBI on PTSD can be attenuated by blocking the interaction between Preso and mGluR1,providing a potential target for the treatment of bTBI-associated PTSD.