不同劑量SEC與SMC之抗氧化作用-糖尿病動物模式之研究

糖尿病是台灣地區重要的慢性病之ㄧ，且其併發症的複雜使得該疾病難以控制。本研究是在探討來自大蒜的水溶性含硫化合物S-methyl cysteine（SMC）及S-ethyl cysteine（SEC）對於糖尿病老鼠的保護作用。採用Balb/c雄鼠，經尾靜脈注射Streptozotocin（STZ；200mg/kg）誘發糖尿病，確認糖尿病誘發成功後，再於Balb/c老鼠飲水中分別加入2 g/L（高劑量，H）、1 g/L（中劑量，M）和0.5 g/L（低劑量，L）的SMC及2 g/L（高劑量）、1 g/L（中劑量）的SEC，其組別分別為（1）Control（2）DM-Water（3）DM-SMCH（4）DM-SMCM（5）DM-SMCL（6）DM-SECH（7）DM-SECM，期間採自由飲食、飲水的方式。經餵食四週後犧牲。實驗分析血漿中的葡萄糖、胰島素、麩胱苷肽過氧化酶、纖維網狀蛋白、肌酸酐、C-反應蛋白、血尿素氮等含量變化、蛋白激酶C以及轉化生長因子-β1的活性及脂質過氧化程度。結果顯示，飲用SMC與SEC的糖尿病小白鼠不論高中低劑量皆會使血糖顯著性的下降（p＜0.05），飲用SMC之特殊飲水可延緩糖尿病所引起的纖維網狀蛋白。抗氧化方面，麩胱苷肽過氧化酶活性有顯著增加（p＜0.05）。在腎臟保護方面，飲用高中低劑量之SMC與SEC均顯著降低其血中尿素氮（p＜0.05）；而轉化生長因子-β1則以中低劑量的SMC下降較顯著（p＜0.05）。由上述結果顯示出，飲水中添加大蒜的水溶性含硫化合物S-methyl cysteine及S-ethyl cysteine皆有助於改善糖尿病併發症的發生。

Diabetes is one of the major chronic diseases in Taiwan. It is hardly controlled because of its complications. This study was to examine the protection from S-methyl cysteine (SMC) and S-ethyl cysteine (SEC), two sulfur compounds derived from garlic, against diabetic deterioration in streptozotocin-induced diabetic mice. These agents were added at 2 g/L (high dose, H), 1 g/L (medium dose, M), and 0.5 g/L(low dose, L) in drinking water for 4 weeks supplementation. Blood levels of glucose, insulin, glutathione peroxidase, fibronectin, caretinine, blood urea nitrogen, c-reactive protein, transforming growth factor-beta and lipid oxidation were analyzed. Results showed that the intake of both agents could significantly decrease blood glucose and BUN (p<0.05), and increase GPX activity (p<0.05). The intake of SMC could significantly suppress fibronectin level and TGF-β (p<0.05). These results indicated that the intake of SEC and/or SMC could alleviate diabetic deterioration.