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安定對新生大鼠缺血缺氧性腦損傷保護作用及其機制的研究

發(fā)布時間:2018-05-01 18:44

  本文選題:安定 + 缺血缺氧性腦損傷 ; 參考:《鄭州大學》2014年碩士論文


【摘要】:新生兒缺血缺氧性腦損傷(hypoxia-ischaemia brain damage, HIBD)是指圍產(chǎn)期新生兒窒息引起的腦部綜合征,常可引起不可逆的腦組織損傷和一系列神經(jīng)系統(tǒng)后遺癥,是新生兒病死及發(fā)生神經(jīng)系統(tǒng)殘疾的主要原因之一。目的:在本研究中,探討安定對缺血缺氧性腦損傷新生大鼠的近遠期腦保護作用,并對安定可能的腦保護作用新機制進行了初步探討,為臨床治療HIBD提供參考。方法:7日齡新生Sprague-Dawley (SD)大鼠,隨機分為三組(每組20只):假手術(shù)組(Sham)、缺血缺氧模型組(HIBD)和安定治療組(Diazepam)。HIBD模型組參照經(jīng)典Rice-Vannucci法制作HIBD模型;假手術(shù)組僅游離出左側(cè)頸總動脈,不做缺血缺氧處理。模型制備成功后安定治療組立即腹腔注射劑量為10mg.kg-1.8h-1的安定,連續(xù)給藥3天;其他兩組給予相同劑量的生理鹽水。通過氯化2,3,5-三苯基四氮唑(2,3,5-triphenyltetrazolium chloride, TTC)染色以及自主活動和Morris水迷宮實驗來探討安定對新生HIBD大鼠的近遠腦期保護作用。同時,通過Real-time PCR、Western-blot以及免疫組織化學實驗來檢測KCC2mRNA、KCC2蛋白水平的表達情況。 結(jié)果: (1)新生大鼠HIBD模型的鑒定:新生大鼠缺血缺氧完成后,動物出現(xiàn)明顯的左旋癥狀,說明HIBD模型建立成功。 (2) TTC染色結(jié)果顯示:HIBD模型組有大面積的白色腦梗死區(qū)域,再次說明HIBD模型的制備是成功的。與HIBD模型組相比,安定治療組的腦梗死區(qū)域明顯減少(P0.01),提示安定對于HIBD新生大鼠有一定的近期腦保護作用。 (3)自主活動實驗結(jié)果顯示:和假手術(shù)組相比,HIBD模型組的活動明顯減少(P0.05),給予安定治療后活動有所增加,但無顯著差異(P0.05)。 (4) Morris水迷宮實驗結(jié)果顯示:在定位航行試驗中,5天總平均逃避潛伏期為HIBD組>安定治療組>假手術(shù)組,從第三天開始各組之間相比結(jié)果有差異(P0.05or P0.01);在空間探索試驗中,HIBD模型組大鼠的目標象限停留時間百分比和穿越站臺次數(shù)明顯減少,給予安定治療后有一定的改善(P0.05orP0.01)。說明HIBD后大鼠學習記憶能力下降,安定治療能夠減輕HIBD對遠期學習記憶能力的損害。 (5) RT-PCR、Western-blot以及免疫組織化學實驗結(jié)果顯示:KCC2-mRAN和蛋白表達水平在HIBD后顯著下調(diào)(P0.05or P0.01),給予安定治療后有一定的提高。 結(jié)論: (1)早期給予安定治療可以明顯減少HIBD新生大鼠的腦梗死體積,表明安定對HIBD損傷有一定的早期保護作用; (2)早期給予安定治療可以明顯改善HIBD新生大鼠的自主活動能力和空間學習記憶能力,表明安定可以改善遠期神經(jīng)系統(tǒng)預(yù)后; (3)安定通過阻止KCC2在mRAN和蛋白水平上表達的下降,從而發(fā)揮腦保護作用。 綜上所述:安定對新生大鼠缺血缺氧性腦損傷有一定的近遠期保護作用,,其可能的作用機制是通過防止KCC2表達的下調(diào),維持細胞內(nèi)Cl-的穩(wěn)態(tài),確保GABA發(fā)揮抑制性神經(jīng)遞質(zhì)的作用,從而起到腦保護的作用。
[Abstract]:Hypoxia-ischaemia brain damage (HIBD) is the brain syndrome caused by neonatal asphyxia in perinatal period, which often causes irreversible brain tissue damage and a series of neurological sequelae. It is one of the main causes of neonatal mortality and neurological disability. Objective: to discuss in this study The protective effect of diazepam on neonatal rats with ischemic and anoxic brain injury and the possible new mechanism of the protective effect of diazepam were preliminarily discussed. Methods: 7 day old Sprague-Dawley (SD) rats were randomly divided into three groups (20 each group): sham operation group (Sham), ischemic hypoxia model group (HIBD The.HIBD model group (Diazepam) and the diazepam group (Diazepam) group made the HIBD model with the reference of the classic Rice-Vannucci method. The sham operation group was only free from the left common carotid artery and did not do the ischemic anoxia treatment. After the success of the model preparation, the abdominal cavity injection was 10mg.kg-1.8h-1 diazepam, and the other two groups were given the same dose. Physiological saline. The protective effect of diazepam on newborn HIBD rats was investigated by 2,3,5- three phenyl tetrazolium (2,3,5-triphenyltetrazolium chloride, TTC) staining, autonomic activity and Morris water maze test. Meanwhile, KCC2mRNA, KCC2 protein was detected by Real-time PCR, Western-blot and immunohistochemistry. The level of expression.
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