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研究生: 高秋華
Chiu-Hua Kao
論文名稱: 數種植物性雌激素對代謝症候群的影響
The Effects of Several Phtoestrogens on Metabolic Syndrome
指導教授: 吳文惠
Wu, Wen-Huey
學位類別: 碩士
Master
系所名稱: 人類發展與家庭學系
Department of Human Development and Family Studies
論文出版年: 2008
畢業學年度: 96
語文別: 中文
論文頁數: 137
中文關鍵詞: 植物性雌激素脂肪酸代謝代謝症候群人類肝癌細胞株
英文關鍵詞: phytoestrogen, fatty acid metabolism, metabolic syndrome, human hepatocellular carcinoma cell (HepG2 cell)
論文種類: 學術論文
相關次數: 點閱:210下載:7
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  • 代謝症候群指具有腹部肥胖 (central obesity)、高血壓、高血糖、高血三酸甘油酯 (TG)、高密度脂蛋白膽固醇 (HDL-C) 過低並常伴隨脂肪肝等症狀,最終可能引發心血管疾病,而雌激素對於心血管疾病及代謝症侯群相關病灶具保護效應,但若使用雌激素治療可能會增加乳癌風險。本研究分別以動物及細胞實驗模式,探討具植物性雌激素之食材對於代謝症候群病灶之影響。
    實驗一、6週齡apoE剔除小鼠予以卵巢切除後分為2組,OVX組(n = 8) 給予高脂 (20% fat) 飼料、OVX+SE組(n = 8) 給予高脂飼料加0.5% sesamin,餵養11週後犧牲。結果顯示OVX+SE組第4及11週血液TC顯著高於OVX組34% ( p<0.05);血液TG、HDL-C及adiponectin兩組無顯著差異;OVX組主動脈弓與胸主動脈脂質堆積面積百分比高於OVX+SE組,達邊際顯著差異(p = 0.07)。
    實驗二、6週齡C57BL/6J小鼠分為4組,其中sham組施予假手術,其他三組予以卵巢切除,Sham(n = 5)及OVX組(n =11) 給予高脂 (20% fat) 飼料、OVX+ SE組(n=12)給予高脂飼料加0.5% sesamin、OVX+IS組(n=12) 給予高脂飼料加0.5% isoflavone,共餵養14週後犧牲。結果得知OVX+SE組及OVX+IS組第9週血液TC顯著高於OVX組,但到了實驗第14週,各組間無顯著差異。OVX+SE組血液HDL-C顯著高於OVX組27% ( p<0.05),無顯著影響肝臟TC及TG含量;OVX+IS組血糖、肝臟TG含量皆顯著低於OVX組( p<0.05),血液adiponectin顯著低於OVX組55% ( p<0.05);血液TG、insulin、NEFA、HOMA-IR各組間無顯著差異。
    實驗三、以50 nM T0901317或5 μl/ml intralipid兩種方式提高HepG2的TG含量,模擬脂肪肝的生成,並同時分別投予不同劑量之具植物性雌激素活性之食材:sesamin、genistein、enterolactone、苜蓿芽乙酸乙酯萃取物及山藥乙酸乙酯萃取物,共同培養48小時,之後分析細胞內TG含量以及脂肪酸生合成及氧化酵素之mRNA和蛋白質的表現量。結果發現,在LXR agonist模式中,sesamin、enterolactone 及genistein皆能顯著降低肝細胞內TG的含量,而山藥及苜蓿芽乙酸乙酯萃取物對肝細胞TG含量無顯著影響,Intralipid模式中,sesamin、enterolactone 及苜蓿乙酸乙酯萃物可顯著降低肝細胞內TG的含量;進一步發現sesamin、genistein、苜蓿乙酸乙酯萃物均能顯著下降FAS mRNA及蛋白質表現量,且轉錄因子sterol regulatory element binding proteins-1 (SREBP-1) mRNA的表現量也明顯被抑制,sesamin及苜蓿芽乙酸乙酯萃物亦能顯著上升肝細胞脂肪酸氧化酵素acyl-CoA oxidase (ACO) mRNA表現量;所有萃物皆無顯著影響glycerol 3-phosphate acyltransferase (GPAT) mRNA表現量。
    綜觀以上,在此實驗模式,sesamin可上升血液HDL-C,且有下降主動脈脂肪堆積潛力,但會增加腹部脂肪堆積,且不能改善肝脂堆積;isoflavone可下降體重及血糖,且減少腹部脂肪及肝臟脂肪堆積,具有抗肥胖及防治脂肪肝之功效;苜蓿芽乙酸乙酯萃物可下降肝細胞脂肪堆積,但山藥乙酸乙酯萃物無此能力。

    Metabolic syndrome includes central obesity, hypertention, hyperglycemia, hypertriglyceridemia, and low serum level of high density lipoprotein-cholesterol (HDL-C), and is usually associated with cardiovascular diseases and fatty liver. The prevalence of metabolic syndrome increases after menopause due to estrogen deficiency, but estrogen therapy increases the risk of breast cancer. This study was to investigate the effects of some phytoestrogens on atherosclerosis, metabolic syndrome, and fatty liver using ovariectomized (OVX) C57BL/6J mice, OVX apoE-/- mice and HepG2 cells, respectively.

    In experiment 1, 6-wk-old OVX apoE-/- mice were assigned to 2 groups, fed the high fat (20%, w/w) diet (OVX, n = 8) or the high fat diet supplemented with 0.5% sesamin (OVX+SE, n = 8). After 11 wk of feeding, the mice were sacrificed to collect blood and aorta. The results showed that OVX+SE group had a higher serum level of total cholesterol (TC) in wk 4 and 11 (p<0.05), a higher serum level of enterolactone (p<0.05), and a slightly lower percent of aortic lesion areas (p = 0.07) in wk 11. There were no significant differences in serum levels of TG, HDL-C, and adiponectin between the two groups.

    In experiment 2, 6-wk-old female C57BL/6J mice were randomly divided into 4 groups and fed different diets. Sham group (n = 5) and OVX group (n =11) were fed high fat diet; OVX+SE group (n = 12) was fed high fat diet supplemented with 0.5% sesamin; OVX+IS group (n = 12) was fed high fat diet supplemented with 0.5% isoflavones. After 14 wk of feeding, the mice were sacrificed to collect blood and liver. The OVX+SE and the OVX+IS groups had a higher serum levels of TC in wk 9 (p<0.05), but not in wk 14, as compared with the OVX. The OVX+SE group had a higher level of serum HDL-C than the OVX groups (27% increase, p<0.05). Levels of hepatic TC and TG were not significantly different between the OVX and OVX+SE groups. The OVX+IS group had a significantly lower levels of fasting serum glucose, adiponectin (55% reduction, p<0.05) and hepatic TG than the OVX group (p<0.05). There were no significant difference in serum levels of TG, insulin, non-esterified fatty acid, and HOMA-IR among OVX, OVX+SE and OVX+IS group.

    In experiment 3, HepG2 cell was treated with LXR agonist, 50 nM T090137, or 5 μl /ml intralipid to induce intracellular TG accumulation and co-treated with several phytoestrogens for 48 h. Cellular TG and protein contents were determined. mRNA and protein expression of lipogenic and fatty acid oxidation enzymes were evaluated by reverse transcriptase-PCR and Western immunoblot analyses, respectively. The results showed that sesamin, enterolactone or genistein significantly decreased intracellular TG (p<0.05) in LXR agonist model, but yam ethylacetate extracts (EAE) and alfalfa EAE did not. In intralipid model, sesamin, enterolactone or alfalfa EAE significantly decreased intracellular TG (p<0.05). Sesamin, genistein or alfalfa EAE significantly decreased mRNA and protein expression of fatty acid synthase (p<0.05), and significantly down-regulated mRNA expression of sterol regulatory element binding proteins-1 (p<0.05). Sesamin and genistein also decreased acetyl-CoA carboxylase mRNA expression (p<0.05). Besides, sesamin and alfalfa EAE up-regulated mRNA expression of acyl-CoA oxidase, a key enzyme of peroxisomal β-oxidation. But none of the phytoestrogens tested affected the mRNA expression of glycerol 3-phosphate acyltransferase.

    In conclusion, this study shows that sesamin increases serum HDL-C, potentially decreases aorta lesion, but can not improve central obesity or fatty liver; isoflavones can reduce central obesity and reduce the risk of fatty liver; alfalfa EAE may have the potency to reduce the risk of fatty liver.

    表目錄 V 圖目錄 VI 第一章 緒論 1 第二章 文獻回顧 3 第一節 代謝症候群 (Metabolic Syndrome) 3 壹、代謝症候群之命名、定義及其診斷標準 3 貳、代謝症候群之病理機轉及基礎研究 7 参、停經後對於代謝症候群之影響 12 第二節 脂肪組織中之重要因子及細胞激素 15 壹、Leptin 15 貳、Adiponectin 15 第三節 PPARs及LXRs對於脂質代謝的角色 17 壹、PPARs與LXRs 17 貳、PPARα與脂質代謝、肥胖、動脈粥狀硬化的相關性 19 参、LXRs與體內代謝恆定之關係 21 第四節 實驗動物模式 23 壹、ApoE knockout mice 23 貳、卵巢切除誘發肥胖之動物模式 25 第五節 植物性雌激素 (phytoestrogen) 26 壹、植物性雌激素之生理作用 26 貳、植物性雌激素分類及來源 27 参、植物性雌激素與抗代謝症侯群之相關研究 30 第三章 芝麻素對動脈粥狀硬化之影響 34 第一節 前言 34 第二節 材料與方法 35 壹、實驗設計及流程 35 貳、動物飼養、飼料製備、組織取樣及樣品前處理 36 叁、血液脂質分析 38 肆、血清adiponectin分析 40 伍、血清中enterolactone含量測定 41 陸、血管縱切與脂肪堆積染色 41 柒、統計分析 42 第三節 結果 43 壹、攝食及生長情形 43 貳、組織器官相對及絕對重量 43 叁、血液脂質濃度 43 肆、血液adiponectin濃度 44 伍、血液enterolactone(ENL)濃度 44 陸、主動脈脂肪堆積 44 第四節 討論與結論 51 壹、sesamin對於血脂及動脈損傷之影響 51 貳、sesamin代謝產物ENL之效用 53 叁、結論 54 第四章 芝麻素及異黃酮對代謝症候群之影響 55 第一節 前言 55 第二節 材料與方法 56 壹、實驗設計及檢測項目 56 貳、動物飼養、飼料製備、組織取樣及樣品前處理 57 参、血液脂質分析 60 肆、血液細胞激素(cytokines)含量分析 61 伍、血清insulin分析 61 陸、血清中enterolactone含量測定 62 柒、肝臟脂質分析 62 捌、統計分析 63 第三節 結果 64 壹、攝食及生長情形 64 貳、組織器官相對及絕對重量 64 叁、血液脂質濃度 64 肆、血液glucose濃度 65 伍、血液insulin濃度及HOMA-IR 65 陸、血液adiponectin濃度 65 柒、血液enterolactone濃度 65 捌、肝臟脂質濃度 66 第四節 討論與結論 76 壹、卵巢切除後誘發更年期後引起之代謝症候群 76 貳、芝麻素及異黃酮對肥胖之影響 77 叁、芝麻素及異黃酮對adiponectin及胰島素阻抗之影響 79 肆、芝麻素及異黃酮對血脂及心血管疾病之影響 81 伍、芝麻素及異黃酮對肝脂之影響 82 陸、結論 83 第五章 具植物性雌激素之食材對肝細胞脂肪酸代謝之影響 84 第一節 前言 84 第二節 材料與方法 85 壹、實驗設計 85 貳、研究材料 85 参、樣品製備及取得 86 肆、細胞存活率分析 (MTT assay) 87 伍、細胞內蛋白質濃度測定 87 陸、細胞內三酸甘油酯含量測定 88 柒、細胞mRNA表現量 88 捌、西方墨點法 (Western Blotting)分析細胞內蛋白質表現 92 玖、統計分析 94 第三節 結果 95 壹、具植物性雌激素食材之樣本對HepG2細胞存活率之影響 95 貳、具植物性雌激素食材之樣本對HepG2細胞內三酸甘油酯含量之影響 95 叁、具植物性雌激素食材之樣本對HepG2細胞內脂肪酸代謝酵素mRNA表現量之影響 96 肆、具植物性雌激素食材之樣本對HepG2細胞內FAS表現量之影響 98 第四節 討論與結論 108 壹、兩種模式促進HepG2細胞內TG含量 108 貳、具植物性雌激素之食材對於HepG2細胞內脂肪酸生合成作用(lipogenesis)之影響 108 叁、具植物性雌激素之食材對於HepG2細胞內脂肪酸氧化作用(-oxidation)之影響 109 肆、ENL的效用 111 伍、研究限制 111 陸、結論 111 第六章 綜合討論及總結 113 第一節 綜合討論 113 第二節 總結及未來建議 117 第七章 參考文獻 120 表目錄 表2-1 代謝症候群之定義及診斷標準 5 表2-2 雌激素在脂肪組織的效用 13 表2-3 LXRS及PPARS主要表現之組織及其生理作用 18 表3-1 實驗期飼料之組成 37 表3-2 APOE剔除且卵巢切除之小鼠餵食實驗飼料11週體重增加量、平均攝食量及攝食效應 45 表 3-3 APOE剔除且去卵巢之小鼠餵食實驗飼料11週後組織絕對及相對重量 46 表 3-4 APOE剔除且予以去除卵巢之小鼠餵食實驗飼料11週實驗期間血液總膽固醇、三酸甘油酯及ENTEROLACTONE濃度 47 表4-1 實驗期飼料之組成 59 表4-2 假手術或卵巢切除小鼠餵食實驗飼料14週體重增加量、平均攝食量及攝食效應 67 表4-3 假手術或卵巢切除小鼠餵食實驗飼料14週後組織絕對及相對重量 68 表4-4假手術及卵巢切除小鼠餵食實驗飼料14週實驗期間血液參數值 69 表 4-5假手術及卵巢切除小鼠餵食實驗飼料14週後肝臟中總膽固醇及三酸甘油酯濃度 70 表6-1 芝麻素及異黃酮對於代謝症候群之影響 118 表6-2 具植物性雌激素之食材對於脂肪肝的影響 119 圖目錄 圖2-1 在胰島素阻抗的狀態下,三酸甘油酯堆積在肝臟中可能的代謝機轉 11 圖2-2 PPARS及LXRS轉錄機轉 17 圖 2-3 LXRS對於體內脂質恆定的調節機轉 22 圖 2-4 GENISTEIN在細胞模式上的作用機轉 33 圖3-1 APOE剔除並予以卵巢切除之小鼠餵食實驗飼料11週生長曲線 48 圖3-2 APOE剔除小鼠予以卵巢切除餵食實驗飼料11週後血液HDL-C及ADIPONECTIN濃度 49 圖3-3 卵巢切除之APOE剔除小鼠餵食實驗飼料11週後主動脈損傷情形 50 圖4-1假手術或卵巢切除之小鼠餵食實驗飼料14週生長曲線 71 圖4-2 假手術或卵巢切除之小鼠餵食實驗飼料14週後血液HDL-C濃度 72 圖4-3卵巢切除之C57BL/6J小鼠餵食實驗飼料14週後血液游離脂肪酸濃度 73 圖4-4卵巢切除之C57BL/6J小鼠餵食實驗飼料14週後血液INSULIN及GLUCOSE濃度 74 圖4-5卵巢切除之C57BL/6J小鼠餵食實驗飼料14週後血液ADIPONECTIN濃度 75 圖5-1 T0901317、INTRALIPID及具植物性雌激素食材樣本對肝細胞存活率之影響 99 圖5-2 具植物性雌激素之食材對肝細胞內三酸甘油酯含量的影響 100 圖5-3具植物性雌激素之食材對T0901317誘導之肝細胞內FAS MRNA表現量的影響 101 圖5-4具植物性雌激素之食材對T0901317誘導之肝細胞內ACC MRNA表現量的影響 102 圖5-5具植物性雌激素之食材對T0901317誘導之肝細胞內SREBP-1 MRNA表現量的影響 103 圖5-6具植物性雌激素之食材對T0901317誘導之肝細胞內GPAT MRNA表現量的影響 104 圖5-7具植物性雌激素之食材對T0901317誘導之肝細胞內ACO MRNA表現量的影響 105 圖5-8具植物性雌激素之食材對INTRALIPID誘導之肝細胞內ACO MRNA表現量的影響 106 圖5-9具植物性雌激素之食材對T0901317誘導之肝細胞內FAS蛋白質表現量的影響 107

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