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| Title: | 雙酚類化合物對細菌性脂多醣刺激微小膠質細胞活化之影響
The effects of biphenol compounds on lipopolysaccharide-stimulated microglial cell activation |
| Authors: | 楊東冀
Yang, Dong Ji |
| Contributors: | 詹銘煥
Chan, Ming Huan
楊東冀
Yang, Dong Ji |
| Keywords: | 和厚朴酚
微小膠質細胞
抗氧化
抗發炎
ST-24
Honokiol
Microglial cells
Anti-oxidantion
Anti-inflammation
ST-24 |
| Date: | 2012 |
| Issue Date: | 2014-01-02 13:29:11 (UTC+8) |
| Abstract: | 微小膠質細胞在神經退化性疾病中所扮演的角色與機制，在目前許多研究中發現與氧化壓力和發炎反應有關。和厚朴酚 (honokiol)
[2-(4-hydroxy-3-prop-2-enylphenyl)-4-prop-2-enylphenol] 又稱異厚朴酚，為木蘭科植物厚朴 (Magnolia officinalis) 的主要活性成份之一，結構為具有雙丙烯基的多酚化合物 (C18H18O2,MW=266.33)，且具有抗氧化和抗發炎的作用。ST-24 化合物為和厚朴酚的衍生物，用和厚朴酚分子結構為主體修飾而成的化合物，本研究針對和厚朴酚與 ST-24 化合物在細菌性脂多醣刺激微小膠質細胞活化反應中的抗氧化與抗發炎能力作探討。實驗以 3-(4,5-dimethyl-2 thiazoyl)-2,5-diphenyl-tetrazolium bromide (MTT) 分析細胞粒線體的還原能力，藉此判斷細胞的存活率。吉爾任試劑 (Griess reagent) 用來測量藥物對活化後的微小膠質細胞產生活性氮自由基 (reactive nitrogen species, RNS) Nitric oxide (NO‧) 的影響。MTT 與吉爾任試劑分析結果顯示，和厚朴酚與 ST-24 在低濃度不會造成細胞死亡且具有減緩細菌性脂多醣刺激微小膠質細胞過度活化所產生的活性氮自由基。本論文的目標除了比較和厚朴酚與 ST-24 化合物的抗氧化及抗發炎能力外，也探討減緩微小膠質過度活化可能的分子機制。透過觀察細胞型態和西方墨點法，發現給予和厚朴酚與 ST-24 藥物可以減少微小膠質細胞因為 LPS 刺激所產生的偽足、iNOS 及 COX-2 蛋白質表現。而給予和厚朴酚與 ST-24 藥物，則會回復 iNOS 上游分子 PI3K/Akt 蛋白質表現。實驗結果顯示和厚朴酚與 ST-24 可能透過 PI3k/Akt 這個分子機制去調控微小膠質細胞過度活化，但仍需進一步的實驗確認。
The role and mechanisms of microglia cell in neurodegenerative diseases might be related to oxidative stress and inflammatory responses. Honokiol is one of the main constituents from Magnolia officinalis. The structure of honokiol possesses a biphenolic structure with two allyl groups (C18H18O2, MW=266.33) that has anti-oxidative and anti-inflammatory effects. In addition, the anti-oxidative and anti-inflammatory properties of honokiol and ST-24 compounds were explored as well as their inhibitory effect on over-activated microglial cells in this study. In the present study, the 3-(4,5-dimethyl-2 thiazoyl)-2,5-diphenyl-tetrazolium bromide (MTT) assay was used to assess mitochondrial activity, reflecting cell survival. The Griess reagent was used to detect the effects of (reactive nitrogen species, RNS) Nitric oxide (NO‧) in activated microglial cells with honokiol and ST-24.The results show that honokiol and ST-24 did not induce cell death in lower concentrations. Both biphenolic compounds attenuated nitric oxide free radical productions in LPS-stimulated over-activated microglial cells. Besides compared honokiol and ST-24 capability of anti-oxidation and anti-inflammation, this study also explored the biological molecular mechanisms of attenuating over-activated microglial cells. By observation of cell morphology and Western blot, we found that honokiol and ST-24 can reduce pseudopodia, and increases in iNOS and COX-2 protein expression induced by LPS in microglia .Honokiol and ST-24 could restore the upstream molecular PI3K/Akt protein expression. The results suggested that honokiol and ST-24 regulated excessive activation of microglia through PI3K/Akt pathway. |
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2.書籍論文
顏正華, “中藥學(上)”, 知音出版社, 民國八十三年二月初版二刷, 320頁。
莊朝欽。(2009)。和厚朴酚抑制巨噬細胞中細菌內毒素所誘發之細胞激素表現。國立台灣海洋大學食品科學系碩士論文。
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3.網路資源
中藥知識學習網 |
| Description: | 碩士
國立政治大學
神經科學研究所
99754009
101 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0099754009 |
| Data Type: | thesis |
| Appears in Collections: | [神經科學研究所] 學位論文
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