• 沒有找到結果。

中國醫藥大學機構典藏 China Medical University Repository, Taiwan:Item 310903500/25105

N/A
N/A
Protected

Academic year: 2021

Share "中國醫藥大學機構典藏 China Medical University Repository, Taiwan:Item 310903500/25105"

Copied!
7
0
0

加載中.... (立即查看全文)

全文

(1)

腐植酸造成血栓/血液凝固或動脈硬化及機制之探討

計畫類別: 個別型計畫 計畫編號: NSC91-2320-B-039-015- 執行期間: 91 年 08 月 01 日至 92 年 07 月 31 日 執行單位: 中國醫藥大學營養學系 計畫主持人: 楊新玲 報告類型: 精簡報告 處理方式: 本計畫涉及專利或其他智慧財產權,2 年後可公開查詢

中 華 民 國 92 年 10 月 31 日

(2)

一、HA 誘導 LDL 聚集作用的分析

(1) 改變 HA 濃度 先將分光光度計開機且將溫度控制在 37℃,石英管內加入 140 mM NaCl 之 PBS 及不同濃度的 HA 混合後加入 200µg/ml protein LDL(此時總體積為 1ml) ,蓋上蓋子及封 parafilm 測 OD680nm,每隔 5min 測一次 。 (2) 改變 PBS 之 NaCl 濃度 先將分光光度計開機且將溫度控制在 37℃,石英管內加入不同濃度的 NaCl 之 PBS 及不同濃度的 HA 混合後加入 200µg/ml protein LDL(此時總體積為 1ml),蓋上蓋子及封 parafilm 測 OD680nm,每隔 5min 測一次。 (3) 添加砷 先將分光光度計開機且將溫度控制在 37℃,石英管內加入 140 mM NaCl 之 PBS 及 20µg/ml HA 和不同濃度砷混和液後加入 200µg/ml protein LDL(此時 總體積為 1ml),蓋上蓋子及封 parafilm 測 OD680nm,每隔 5min 測一次 。

二、負染法觀察 AgLDL 的分子大小

140 mM NaCl 之 PBS 分別加入 10、20µg/ml HA 及 200µg/ml protein LDL 混 合後,分別在 37℃反應 10min 及 40min ,反應結束後取 7.5 µl sample 滴在 formvar 的銅網上,5 min 後,用濾紙將過多的 sample 吸走,再加入 10 µl 的染劑

(10﹪phosphotungstic acid),分別在 30 及 60 秒時用濾紙將染劑吸乾,放入乾燥

(3)

一、HA 誘導 LDL 聚集作用的分析

HA 會誘導 LDL 聚集作用 (aggregation) ,利用波長 680nm 偵測 AgLDL 的程 度,其吸光值越高則表示 aggregation 程度越嚴重。由圖 1 及 2 可以知道隨著 HA 的濃度增加 LDL aggregation 的程度也逐漸增加,在反應大約 30 分鐘時已達 到飽和,其最高值可達到 1.4 (20 ug/ml HA)。改變 PBS 之 NaCl 濃度,對 LDL

aggregation 程度的影響,NaCl 在水溶液中會解離為 Na+ 、Cl -,Na+ 會和 HA 之 COO-結合,由圖 3 及 4 可以知道隨著 NaCl 濃度增加其吸光值逐漸下降。添加 As5+ 也 是有同樣的結果,由圖 5 及 6 可知隨著 As5+ 的濃度增加其吸光值逐漸下降,其下 降的最低值與未經 HA 處理的 LDL 相似。

二、負染法觀察聚集 LDL (AgLDL) 的分子大小

利用負染法觀察 AgLDL 的分子大小,選擇其中 200 個 LDL 分子測量他的直 徑。n-LDL 平均直徑大約為 22.4nm,經 HA 處理的 LDL 直徑隨著反應時間的增加 而增加,反應 10 分鐘及 40 分鐘的 AgLDL 分子平均直徑分別為 22.66nm、 25.27nm, 其中反應 40 分鐘的 AgLDL 分子最大為 100nm。由圖 7 可知隨著作用時間增加 LDL 分子直徑在 20~29nm 的數量逐漸減少,而大於 30 nm 的分子數量逐漸增加增加。

(4)

Fig.1.The aggregation of LDL (200 ug/ml) induced by HA as a function of timemonitored by the turbidity measurement at 680 nm at 37℃.

Fig.2.Graph showing the dependence of turbidity change (△O.D. 680 nm) as a function of concentration of HA. The concentration of LDL was 200 ug/ml.

time (mine) T u rb id it y (O .D .68 0n m ) 0.0 0.4 0.8 1.2 5 ug/ml HA 7.5 ug/ml HA 10 ug/ml HA 12.5 ug/ml 15 ug/mlHA 17.5 ug/ml HA 20 ug/ml HA HA conc. (ug/ml) 0 5 10 15 20 ∆ A680nm 0.0 0.4 0.8 1.2 1.6

(5)

NaCl conc. (mM) 0 100 200 300 400 500 ∆ A68 0nm 0.0 0.4 0.8 1.2 1.6

Fig.3.The aggregation of LDL (200 ug/ml) induced by HA (20 ug/ml) as a function of time at different concentrations of NaCl monitored by the turbidity measurement at 680 nm at 37℃.

Fig.4.Graph showing the dependence of turbidity change (△O.D. 680 nm) as a function of concentration of NaCl . The concentration of LDL and HA was 200 ug/ml and 20 ug/ml.

time (min) 0 10 20 30 40 50 Tu rb id ity (O .D. 680nm ) 0.0 0.4 0.8 1.2 360 mM NaCl 400 mM NaCl 440 mM NaCl 500 mM NaCl

(6)

Fig.5.The aggregation of LDL (200 ug/ml) induced by HA (20 ug/ml) as a function of time at different concentrations of As5+ monitored by the turbidity measurement at 680 nm at 37℃.

Fig.6.Graph showing the dependence of turbidity change (△O.D. 680 nm) as

a function of concentration of As5+. The concentration of LDL and HA was

200 ug/ml and 20 ug/ml.

time (min) 0 10 20 30 40 50 Tur b id it y ( O .D .68 0nm ) 0.0 0.4 0.8 1.2 1.6 0 mM As5+ 10 mM As5+ 20 mM As5+ 30 mM As5+ 60 mM As5+ 90 mM As5+ 100 mM As5+ 200 mM As5+ 300 mM As5+ A s5+ conc. (m M ) 0 50 10 0 150 200 250 300 350 400 450 ∆ A 6 80nm 0.0 0.4 0.8 1.2

(7)

L D L 1 0~ 1 9 2 0~ 29 30~ 39 40~ 49 50~ 59 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 nu m b er s i z e ( n m ) (B) L D L + 2 0 u g / m l H A 1 0 m i n s i z e ( n m ) 10~1 9 20~2 9 30~3 9 40~4 9 50~5 9 60~6 9 un m b er 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 (C) L D L + 2 0 u g / m l H A 4 0 m i n s i z e ( n m ) 1 0~1 9 2 0~2 9 3 0~ 3 9 4 0~ 4 9 5 0~5 9 6 0~ 6 9 7 0~ 7 9 8 0~ 8 9 9 0~ 9 9 1 00 ¡ ô nu m b e r 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0

Fig.7. Electron microscopic analysis of HA treated LDL particles. LDL (200ug

protein/ml) was incubated at 37℃ for 10 min and 40 min with 20ug/ml HA. The LDL particles were examined by electron microscopy after negative staining, and size distributions of the negatively stained particles were determined.(A) native LDL; (B) HA treat LDL incubator 10min; (c) HA treat LDL incubator40min.

參考文獻

相關文件

臺大機構典藏NTUR (National Taiwan University 二 Repository, http://ntur.lib.ntu.edu.tw) 經驗與協助推 動臺灣學術機構典藏TAIR (Taiwan Academic Institutional Repository,

The properties of the raw and the purified CNTs were examined by thermal gravimetric analysis (TGA), Raman spectroscopy, nitrogen adsorption, field emission scanning electron

The prepared nanostructured titania were applied for the photoanodes of dye-sensitized solar cell.. The photoanodes were prepared by the doctor blade technique and the area

By correcting for the speed of individual test takers, it is possible to reveal systematic differences between the items in a test, which were modeled by item discrimination and

The existence of cosmic-ray particles having such a great energy is of importance to astrophys- ics because such particles (believed to be atomic nuclei) have very great

Loss of vascular content, increase of fat in the bone marrow cavity, and fibrosis showed a linear relation with time after radiation and were considered the end stage of

The chairman/representative director, and at least 2/3 of the board of directors of a limited company or a company limited by shares providing the above services shall be the Republic

The encoding complexity of our BIBD codes is extremely low and is basically determined by the size of a cyclic difference family upon which a block design is based, or by the