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    題名: p53 抑制劑對腦創傷引起急性肺損傷的治療效果
    Therapeutic effects of p53 inhibitors on acute lung injury induced by traumatic brain injury
    作者: 鄧穎佳
    Tang, Veng-Kai
    貢獻者: 王家儀
    關鍵詞: 創傷性腦害;急性肺損傷;細胞凋亡;p 53 抑制劑
    Traumatic brain injury;Acute lung injury;Apoptosis;p53;Pifithrin
    日期: 2015-07-21
    上傳時間: 2020-08-28 15:31:31 (UTC+8)
    摘要: 腦創傷(traumatic brain injury, TBI)的病人經常會有神經系統以外的併發症,這些病人約有20%-25%會發生急性肺損傷(acute lung injury, ALI)。腦創傷後引起的急性肺損傷(TBI-induced ALI)通常會在腦創傷後迅速發展,而且病人的預後通常不好。它是一個急性致命的疾病而且伴隨很高的死亡率。
    腦創傷合併急性肺損傷的致病機轉現在還不明確,但肺泡上皮細胞(alveolar epithelial cells)的凋亡(apoptosis)卻是這個疾病發展的一個重要表現。 肺泡上皮細胞凋亡在急性肺損傷的細胞及分子致病機轉上佔有一個重要的角色。腫瘤抑制基因p53被認為是細胞凋亡的一個重要調節因子。先前我們實驗室的研究顯示,p53抑制劑:Pifithrin-(PFT-)及Pifithrin-O(PFT-O),在動物實驗中的腦創傷方面具有神經細胞保護作用。 而Pifithrin-μ(PFT-μ),是PFT-的類似物,也是一種p53抑制劑,可以抑制p53依賴的細胞凋亡,但跟PFT-不一樣,它不會抑制p53的轉錄活性的化合物。
    我們的實驗主要探討在腦創傷後給予p53抑制劑(PFT-、PFT-O、PFT-μ)是否對創傷性腦傷害所引起的急性肺損傷具有治療效果。我們在腦創傷後5小時給予大鼠PFT-、PFT-O、PFT-μ(2 mg/kg,i.v.),發現肺部組織損傷在腦創傷後二十四小時有顯著改善,在腦創傷後七天肺部重塑(remodeling)的程度也會因為使用PFT-、PFT-O、PFT-μ而減少。而PFT-μ還具有在腦創傷後二十四小時改善肺水腫(pulmonary edema)的效果。
    從以上的實驗結果可知p53抑制劑(PFT-、PFT-O、PFT-μ)對腦創傷引起的急性肺損傷具有治療效果,比較這三種p53抑制劑,只有PFT-μ能改善肺水腫。表明PFT-μ將來可能發展成腦外傷引起的急性肺損傷的治療藥物。
    Patients with traumatic brain injury (TBI) have non-neurological complications frequently, about 20%-25% patients with TBI develop acute lung injury (ALI). TBI-induced ALI develops rapidly following the injury and significantly complicates the overall clinical status of the patient. It is an acute life threatening disease and has high mortality rate.
    Although the mechanism of TBI-induced ALI is unclear, apoptosis of alveolar epithelial cells may play a crucial role in the cellular and molecular mechanism of ALI. The tumor suppressor gene p53 has been found to be as an important regulator of apoptosis. Previous studies in our laboratory have shown the p53 inhibitor, Pifithrin- (PFT-) and Pifithrin-O (PFT-O), has neuro-protective effect on TBI in animal studies. Pifithrin-μ (PFT-μ) is a compound that inhibits p53-dependent apoptosis without inhibiting p53 transcriptional activity. In this study we examined whether post-injury administration of p53 inhibitors (PFT-, or PFT-O or PFT-) has the therapeutic effects on TBI-induced ALI. The PFT-, or PFT-O or PFT- (2 mg/kg, i.v.) was administered to rats at five hours after TBI. The lung injury significantly improved at 24 hours after TBI. The severity of lung remodeling at 7 days post-TBI was reduced with post-injury administration of PFT-, or PFT-O or PFT- groups. PFT-μ also improved pulmonary edema of lung at 24 hours after TBI. These data suggested that p53 inhibitors PFT-, or PFT-O or PFT- have therapeutic effects on TBI-induced ALI. The therapeutic effect of PFT-μ is better than PFT-、PFT-O because it can improve pulmonary edema. PFT-μ may be developed as new therapies for TBI induced ALI.
    描述: 碩士
    指導教授:王家儀
    委員:高毓儒
    委員:陳瑞明
    資料類型: thesis
    顯示於類別:[醫學科學研究所] 博碩士論文

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