臺灣博碩士論文加值系統

Summary摘要
本研究利用電壓箝制術（Voltage clamp technique）測定木通萃取物對於青蛙腹部皮膜組織離子通道活動之影響。青蛙皮膜組織膜間電位差在穩定時平均值為-42.72± 13.12mV。以電壓箝制術使皮膜兩側電位維持在0 mV時，其短路電流( short circuit current，Isc )由黏膜側到漿膜側之平均值55.37± 8.43μA。當電壓箝制於10 mV，將木通萃取物施加於黏膜側後10分鐘內，其△Isc大幅上升至84.15± 10.31μA，且此時皮膜之電導值( conductance, Gi )由1.13μS上升至2.34μS，木通萃取液施加於漿膜側(serosal side)，產生的短路電流（Isc）並無明顯變異，推想在漿膜側可能不具木通作用之離子通道。
經過離子通道調控劑（ion channel modulator），amiloride(一種強烈鈉離子通道阻斷劑)於皮膜組織黏膜側處理10分鐘後，其短路電流由44.38± 8.57μA被抑制為4.13± 3.12μA。若再加入木通的萃取物其短路電流上升至25.41± 8.54μA；以電壓箝制術使膜電位上升10 mV，計算其Gi值。發現Gi值可由0.30μS上升至0.97μS。
將鈣離子通道阻斷劑( nifedipine )加入漿膜側之後，測得之△Isc為47.15± 5.49μA。以鈣離子通道阻斷劑處理之後再加入木通萃取物於黏膜側時之△Isc上升至78.39± 8.14μA，以電壓箝制術使膜電位上升10 mV，計算其Gi值，發現Gi值無顯著變化。
鈉鉀離子幫浦抑制劑（ouabain）在加入皮膜組織的漿膜側後使△Isc下降至36.58± 6.47μA，而以鈉鉀離子幫浦抑制劑處理之後加入木通萃取物於黏膜側則△Isc上升至56.43± 4.35μA，以電壓箝制術使膜電位上升10 mV，計算其Gi值，發現Gi值由1.07μS變成1.74μS。
依據上述結果可歸納出下列結論：
一、木通可作用於青蛙皮膜黏膜側使膜通透性大為提高。
二、木通造成之皮膜導電度(conductance)昇高，可能不是經由影響amiloride sensitive Na+ channel之通路造成；因木通造成之短路電流不能被amiloride 完全阻斷。
三、漿膜側 Na+-K+ pump受ouabain抑制時，仍可使木通加在黏膜側之皮膜Isc加大。除主動運輸之鈉離子之外，尚有其他非主動運輸離子流受木通之影響。
四、木通加在黏膜側所增高之Isc現象不受nifedipine (L-type Ca++ channel blocker )抑制，由此推論木通造成之短路電流不是由鈣離子所造成。可能是經由其他離子包括氯離子之流動而造成。

Summary
Clmatis Armandi has been used frequently in traditional Chinese medicine for the treatment of diuretic symptoms. The mechanism of its action is unclear. Possible action of this substance may involve alternation of electrolyte transport through the epithelia membranes. In this study，transepithelial conductance of frog skin was measured in vitro in voltage-clamped Ussing chambers. Adding Clematis Armandi extracts to apical surface induced a conductance increment of 1.21 μS and an apical to serosal Isc of 28.78 μA/cm2. The Isc can not be completely blocked by apical application of amiloride. Nifedipine and TEA had no effect on Clematis Armandi induced Isc decrease. These data indicate that frog skin is highly responsive to the concentrated Clematis Armandi extracts. The increase in Isc reflects changes in transepithelial transport of Na+ ions modulated at apical membrane. The enormous increase in transepithelial conductance suggests that in additional to enhancement of amiloride-sensitive Na+ channels, Clematis Armandi may also modulate other pathways, such as Cl- ion channel modulation, which needs further investigation.

目 錄
頁次
誌謝
中文摘要1
英文摘要3
目錄Ι
緒言5
研究目的14
材料與方法15
結果24
討論26
參考文獻30
圖30-42
表43-44
附圖46-48

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