2014年7月29日 訊 /生物谷BIOON/ --癌症的放療往往就是將患者或者腫瘤部位直接暴露於電離輻射下,比如伽瑪射線或X射線等,放療方法可以永久性地損傷癌細胞;但是不幸的是,放療往往對健康組織也有具有傷害作用,尤其是對腫瘤部位外部的皮膚組織,所以這種癌症療法往往使得患者面臨脫髮、皮膚病甚至皮膚癌的風險,因此開發使得患者能夠免於放療引發的副作用的新型策略一直是科學家們感興趣的領域。
近日,刊登在國際雜誌Int. J. Low Radiation上的一篇研究論文中,來自阿曼尼茲瓦大學等處的研究人員通過研究揭示了,三種普遍存在的植物天然衍生物保護患者免於放療伽瑪射線引發的皮膚損傷的分子機制。
文章中,研究者在非毒性濃度下檢測了有機的抗氧化物咖啡酸(CA)、羅丹酚酸(RA)以及反式肉桂酸(TCA)對患者的有益作用,研究者檢測了這些化合物抵禦伽瑪射線降低皮膚細胞產生活性氧的水平及保護性效應,結果顯示,利用上述三種抗氧化物均可以有效保護患者的皮膚細胞免於伽瑪射線的毒性傷害,保護的效率分別為40%(CA)、20%(RA)和15%(TCA)。
研究者表示,保護性效應的產生是因為這些抗氧化物可以「吞掉」活性氧並且化學性地對其滅活,與此同時還可以增強機體DNA的修復機制。
最後研究者建議,這些化合物或許可以被用於化療或放療期間患者的皮膚保護劑來使用,未來研究中研究人員將會通過進行更為深入的臨床試驗來檢測上述三種抗氧化物的潛在性能。(生物谷Bioon.com)
An in vitro evidence for caffeic acid, rosmarinic acid and trans cinnamic acid as a skin protectant against γ-radiation
Faruck Lukmanul Hakkim; Miwa Miura; Naoki Matsuda; Ahmed Suleiman Alharassi; Gilles Guillemin; Motohiro Yamauchi; Girija Arivazhagan; Hyuk Song
Ionising radiation (γ or X-rays) is the mandatory tool to treat cancer despite its detrimental effects in particular on skin cells which lead to severe dermatological diseases and carcinogenesis. Natural antioxidants caffeic acid (CA), rosmarinic acid (RA), trans cinnamic acid (TCA), p-coumaric acid (PCA), and hydroxyphenyllactic acid (HPA) acid are known to be potent anticancer and antioxidant agents. Current study is designed to provide experimental evidence as these compounds offer radiation protection for skin cells. Non-toxic concentrations of CA, RA, TCA, PCA, and HPA were tested for radiation protection, γ-radiation induced intracellular reactive oxygen species (ROS) by flow cytometry and DNA double strand break in human keratinocytes (HaCaT cells) by immunocytochemistry. CA, RA and TCA pre-treatment can protect the HaCaT cells by 40%, 20%, 15% respectively through scavenging γ-radiation induced ROS and decreasing number of post irradiation 53bp1 foci. Inclusion of these compounds in chemo-radiotherapy could facilitate to achieve multiple target protection (i.e. anti-cancer and skin radio protectant).