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  • 學位論文

鮫鯊烯對急性四氯化碳誘導大鼠肝損傷之作用

Effects of squalene on acute carbon tetrachloride induced liver injury in rats

指導教授 : 蒙美津 邱駿紘
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摘要


本研究係探討鮫鯊烯對於四氯化碳所誘發Sprague-Dawley 大鼠急性肝損傷之作用。實驗分為兩個部分,一為探討四氯化碳誘發肝損傷之大白鼠短期攝食鮫鯊烯後對肝功能指標、肝臟脂質過氧化和相關酵素的影響,另一為探討短期經口投予鮫鯊烯對四氯化碳誘發肝損傷之大白鼠基因方面的表現。 實驗動物共分為4 組,(1)正常對照組(未經四氯化碳處理);(2)四氯化碳組(只投予四氯化碳);(3)鮫鯊烯組(只投予鮫鯊烯);(4)實驗組(投予四氯化碳和鮫鯊烯)。實驗期間每日給予鮫鯊烯組和實驗組管餵ㄧ次1 mL 鮫鯊烯(0.21 g 鮫鯊烯/100 g 大鼠體重)。正常對照組與四氯化碳組則每日給予管餵ㄧ次1 mL 之蒸餾水作為安慰劑。實驗為期二週,犧牲前分別給予四氯化碳組和實驗組腹腔注射ㄧ次40 % 四氯化碳(以olive oil 稀釋;1 mL/kg 大鼠體重),進行急性肝臟損傷誘導。正常對照組與鮫鯊烯組則給予腹腔注射olive oil 作為安慰劑。 實驗結果發現,以四氯化碳誘發大白鼠之急性肝損傷後,血漿中天門冬胺酸轉胺基酶(AST)、丙胺酸轉胺基酶(ALT)、鹼性磷酸酵素(ALKP)、乳酸脫氫酶(LDH)、γ-麩胺醯轉移酶(γ-GT)以及肝臟組織中的丙二醛(MDA)和一氧化氮(NO)有著不同程度的上升,但是在給予鮫鯊烯的組別中,其上升的幅度較沒有給予的為低;而肝臟組織中麩胱胺酸過氧化物酶(GPx)、麩胱苷肽S-移轉酶(GST)、超氧化歧化酶(SOD)和過氧化氫酶(CAT)的活性則有不同程度的下降,但是在給予鮫鯊烯的組別中,其下降的幅度較沒有給予的為低。 在RNA 和蛋白質表現量方面,以四氯化碳誘發大白鼠之急性肝損傷後,而肝臟組織中麩胱胺酸過氧化物酶(GPx)和過氧化氫酶(CAT)不論在RNA 或是蛋白質的表現量都有不同程度的下降,但是在給予鮫鯊烯的組別中,其下降的幅度較沒有給予的為低,但是對於超氧化歧化酶(SOD)則是沒有影響的。 綜合以上結果,鮫鯊烯可減少大白鼠由四氯化碳所引起之急性肝損傷,此護肝功效可能是部分藉由增加抗氧化酵素的活性而減少四氯化碳的損傷。

關鍵字

鮫鯊烯 四氯化碳

並列摘要


The purpose of this study was to investigate the effect of squalene on carbon tetrachloride(CCl4)induced rat liver injury. Male Sprague-Dawley rats were used as experimental animals. This study was divided into two parts. The first one was to examine the effect of squalene on plasma liver function markers, liver lipid peroxidation and enzyme activities in CCl4 induced rat. The second one to assess the effect of squalene on genetic expression. Rats were divided into four groups including control group, carbon tetrachloride group, squalene group and experiment group. The rats in squalene and experiment groups were fed squalene (0.21 g/100 g B.W./per day) for two weeks. The liver-damaged rats were induced by peritoneal injection of CCl4 (0.1 mL/100 g B.W. of 40% CCl4 in olive oil). The results showed that squalene significantly decreased plasma ALT, AST, ALKP, LDH and γ-GT activities in liver injury rat model. In addition, squalene significantly increased liver CAT, SOD, GST and GPx activities. In conclusion, the results of this study demonstrate that squalene had a hepatoprotective action against CCl4-induced acute hepatic injury in rats and the protective effect may be, at least in part, due to its ability to decrease the metabolic activation of CCl4 by increasing the antioxidant enzyme activities.

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