| 摘要: | 近年來許多研究指出，腸道菌叢不平衡及腸道通透性增加為酒精性
肝臟疾病(alcoholic liver disease)之重要致病機轉之一。而魚油在許多研究中也被發現具有抗發炎及抗氧化等功效。因此本研究以腸道健康的觀點，探討魚油對於大白鼠酒精性肝臟疾病之改善效果。本研究使用八週齡雄性Wistar 大白鼠48 隻，經一週預養後，依據血漿AST(Aspartateaminotransferase)、ALT(Alanineaminotransferase)活性分為控制組(C)、以魚油取代25%橄欖油組(CF25)、魚油取代57%橄欖油組(CF57)、酒精組(E)、以魚油取代25%橄欖油酒精組(EF25)、魚油取代57%橄欖油酒精組(EF57)等六組。控制組以不含酒精之液體飼料餵養，酒精組以酒精液體飼料餵養，而CF25、EF25 組以及CF57、EF57 組則分別取代控制組或酒精組飼料中25%及57%的橄欖油，各組以等熱量方式進行餵養。於實驗期第八週進行腸道通透性測定及收集糞便樣本進行菌相分析。實驗結果發現，肝功能指標AST 及ALT 活性在第八週時E 組皆顯著高於C組，而與Ｅ組相比，EF25 及EF57 組其AST 活性皆顯著下降。肝臟病理切片結果E 組脂肪堆積、發炎以及壞死程度方面皆顯著高於C 組；與Ｅ組比較，EF25 及EF57 則可以顯著降低脂肪堆積及發炎反應。氧化壓力測
定方面，肝臟中GSH/GSSG ratio 方面，C 組與E 組無顯著差異，與Ｅ
組相比EF25 組無顯著差異，但EF57 組則顯著上升。血漿及肝臟TBARS濃度，E 組皆顯著高於C 組，而與Ｅ組相比，EF25 及EF57 組皆顯著降低。肝臟CYP2E1 表現量，E 組表現量顯著高於C 組，Ｅ組與EF25 及EF57 組相比則無顯著差異。發炎反應方面，E 組肝臟中TNF-α、IL-1、IL-6、IL-10 細胞激素濃度皆顯著高於C 組，與Ｅ組相比EF25 及EF57組肝臟IL-1、IL-6、IL-10 濃度顯著降低，然而EF25 組其TNF-α 濃度顯著低於Ｅ組。血漿中內毒素含量各組間皆無顯著差異。腸道通透性各組間皆無顯著差異。腸道菌相方面，總厭氧菌及Lactobacilli 菌數各組間皆無顯著差異。E. coli 菌數方面，C 組與E 組雖無顯著差異，但與Ｅ組相比，EF25 及EF57 組皆顯著降低。此外，Bifidobacteria 菌數方面，Ｅ組顯著低於Ｃ組，與Ｅ組相比，EF25 組菌數顯著升高，但EF57 組則無顯著差異。由以上實驗結果可知，以25%或57%魚油取代飼料中橄欖油，可藉由降低長期攝取酒精之大白鼠肝臟TNF-α、IL-1、IL-6 以及IL-10濃度及降低腸道有害菌E.coli 並增加有益菌Bifidobacteria 菌數，以改善大白鼠酒精性肝損傷。
Imbalance of intestinal microbiota and increased intestinal permeability are considered as important pathological development of alcoholic liver
disease. The previous study was to investigate the fish oil have potential in anti-inflammatory and anti-oxidative. Therefore, the present study was to
investigate the protective effects of fish oil on hepatic injury in ethanol-fed rats based on intestinal health. The 8-weeks-old male Wistar rats were acclimated for 1 week, and then according to aspartate aminotransferase
(AST) and alanine aminotransferase (ALT) activities, 48 rats divided into six
groups (n=8 per group) for feeding with either control diet or ethanol diet, in
which the fat composition of both diets was adjusted with 25% or 57% fish oil substitution for olive oil. The groups were C (control), CF25 (control
with 25% fish oil substitution for olive oil), CF57 (control with 57% fish oil substitution for olive oil), E (ethanol), EF25 (ethanol with 25% fish oil substitution for olive oil), and EF57 (ethanol with 57% fish oil substitution for olive oil). Before sacrificed, will analysis the intestinal permeability and
intestinal microbiota. Rats were sacrificed after 8 weeks. Results showed that plasma AST and ALT activities, hepatic thiobarbituric acid reactive substances (TBARS) levels, and hepatic tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, and IL-10 were significantly increased in E group.
In addition, hepatic histopathological analysis scores of inflammation, degeneration and necrosis, and fatty change in E group were significantly
higher. However, plasma AST activity, plasma and hepatic TBARS, and hepatic TNF-α, IL-1β, IL-6, and IL-10 levels were significantly decreased in EF25 and EF57 groups than those in E group. The histological changes were
also improved in EF25 and EF57 groups. The fecal Lactobacilli numbers in E group were significantly decreased than that in C group. However, the
fecal Lactobacilli numbers in EF25 group were significantly increased than that in E group. There was no change in intestinal permeability among
groups. In conclusion, suggested that fish oil substitution may prevent ethanol-induced liver damage by reducing inflammatory cytokines and improving the intestinal microbiota composition. |
