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利用匍枝根黴菌(

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利用匍枝根黴菌( Rhizopus stolonifer )細胞壁組成

(RHIZOCHITOSAN)結合血小板(RegenplexTM )作為創傷敷材

之探討

Combination of cell wall component of Rhizopus stolonifer with RegenplexTM to make a new wound dressing product

中文摘要

組織工程(Tissue engineering)為結合生物、化學及工程三方面的原則,來發 展具功能性的代替品,以便恢復、維持、或改善生物組織的功能。組織工程的基 本架構主要是由細胞(Cell)、支架(Scaffold)及信號(Signal)所結合而成。

本篇實驗之主要目的便是以組織工程的方式來發展出一個新的創傷敷料。首先,

在經過篩選數種真菌及生物醫材後,我們發現由匍枝根黴菌(Rhizopus

stolonifer)細胞壁所萃取出的 RHIZOCHITOSAN 最適合作為此敷材的支架。經由 電子顯微鏡的觀察後,發現此支架具有多性之特徵。另外,經過 Elson-Morgan 比色法亦證實,RHIZOCHITOSAN 為一種含有幾丁聚醣(Chitosan)成份的基質材 料,其含量約為 13.33%。而在物理特性的觀察方面,此材料的吸水能力比同來 源的 RHIZOCHITIN 好 2.4 倍且有一定的韌性。

再者,我們使用一 Platelet-rich-Plasma(PRP)的相關產品,RegenplexTM,

作為新敷材中的信號來源。 RegenplexTM 是一個富含生長因子(Growth factor)

的生物性材料,它主要的來源是把血液中的血小板加以濃縮再乾燥而製成。此材 料不但可以長時間保留生長因子的活性,更可以在常溫下長期保存,並且在使用 量很少情況之下對治療創傷便有不錯的效果。

根據上述兩者之特性所結合之複合材料,在經由電子顯微鏡觀察後已經發現 RegenplexTM 可以吸附在 RHIZOCHITOSAN 上面。而在測試生長因子的釋放活性實 驗中,觀察到 RegenplexTM 並不會受到 RHIZOCHITOSAN 的影響,並且以可以長期 釋放生長因子達一個月之久。另外在動物實驗中,我們觀察到 RHIZOCHITOSAN 與 RegenplexTM 的複合材,在前期對於老鼠背部的傷口癒合程度比起單獨使用或 是對照組的效果來得更好。而在 Zymography 的實驗中,RHIZOCHITOSAN、

RegenplexTM 與兩者之複合材皆可以在傷口癒合前期降低 MMP-9 的表現,但對 MMP-2 來說只有複合材料會使其在癒合後期大量表現。再者,在組織切片中,我 們也可以在第七天的時候就發現到實驗組的效果已比對照組好。

總而言之,在本研究中我們已經證實 RHIZOCHITOSAN 確實可以吸附 RegenplexTM 並可以穩定且長期地釋放生長因子。而此新的創傷敷材,也的確可以幫助老鼠傷 口的前期癒合並抑制 MMP-9 及刺激 MMP-2 的表現。

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英文摘要

RegenplexTM , a dry form of platelets and thrombin, produced growth factors when suspended in PBS. RegenplexTM is not only sustain to release growth factors for a long time, but also can stored in ambient environment. Nevertheless, because it’s cost too high to utilize on clinical directly. The main purpose of experiment is using the cell wall component isolated from Rhizopus stolonifer (RS-6) to combine with RegenplexTM and find a new wound dressing product. This new product provides a elastic mechanical support on which the adhered platelets were protected. In this way, it is possible for clinical-used and the growth factors releasing is not interfered.

After screening a lot of biomaterials, we suggest that the chitosan-rich component of Rhizopus stolonifer was an ideal scafford for this purpose. We also find that this new product is a sponge-like porous material with a strong ability to absorb water.

The ability of releasing growth factors and the enhancement of wound healing for this product is now under investigation.

參考文獻

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