Design, synthesis and antitumor activities of chlorin p6 ether derivatives as photosensitizer for photodynamic therapy
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摘要: 目的 基于前期研究表明二氢卟吩f的3-乙烯基成醚修饰具有更强的光敏抗肿瘤活性而设计合成二氢卟吩p6醚类光敏剂（ 1 ），研究其初步体外光动力抗癌活性。 方法 以蚕沙叶绿素a粗提物酸水解产物脱镁叶绿酸a（ 5 ）经碱及空气氧化降解制得的紫红素-18（ 4 ）为先导物，通过碱水解和CH2N2甲基化制得二氢卟吩p6三甲酯（ 2 ）， 2 与33% HBr加成后再和烷氧醇发生亲核取代反应生成目标化合物（ 1 ），并评价其对黑色素瘤B16-F10细胞的光动力杀伤效应。 结果 6个目标化合物 1a - 1f 对黑色素瘤B16-F10细胞的体外光动力抗癌活性均优于同类阳性对照药他拉泊芬和维替泊芬，其结构经电喷雾质谱（ESI-MS）、氢谱（1H NMR）、碳谱（13C NMR）及电喷雾高分辨质谱（ESI-HRMS）确证。 结论 二氢卟吩p6醚类光敏剂具有光动力抗癌活性强、治疗指数（暗毒/光毒比）高等优点，值得进一步开发研究。Abstract: Objective To designe, synthesize a series of chlorin p6 ether photosensitizers and preliminarily investigate their photodynamic antitumor activity based on previous research results that alkoxyl ether derivatives of 3-vinyl on chlorin f exhibited stronger photosensitive antitumor activity than parent compound. Methods Purpurin-18 ( 4 ) was obtained by oxidative degradation with air and alkali on pheophorbide a ( 5 ) which was prepared through acid hydrolysis of chlorophyll a from crude chlorophyll extracts in Chinese traditional herb named Silkworm excrement. Then, chlorin p6 trimethylester ( 2 ) were formed via basic hydrolysis of internal anhydride ring for lead compound 3 and following immediately methylation with CH2N2. The intermediate 2 reacted with 33% HBr, following nucleophilic substitution with various alkoxyl alcohol to get six title compounds ( 1 ). All title compounds were subjected to photodynamic antitumor activity screening for melanoma B16-F10 cell in vitro. Results All title compounds showed much higher phototoxicity against melanoma B16-F10 cells than talaporfin and verteporfin. Their structures were confirmed by 1H-NMR, 13C-NMR, ESI-MS and ESI-HRMS spectra. Conclusion Chlorin p6 ether compounds were promising candidate photosensitizers for PDT applications due to theirs high dark toxicity/phototoxicity ratio and excellent phototoxicity, which were worthy of further research and development.
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Key words:
- photodynamic therapy (PDT) /
- photosensitizer /
- chlorine p6 /
- ether derivatives /
- antitumor
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