猴耳环的化学成分及其对T淋巴细胞增殖的影响

目的研究猴耳环Pithecellobium clypearia Benth枝叶的化学成分及其免疫活性。方法采用多种色谱学方法进行分离纯化,利用波谱学方法进行结构鉴定;并通过ConA诱导的T淋巴细胞增殖试验考察各化合物的免疫活性。结果从中分离并鉴定了8个化合物,分别为（-）-表没食子儿茶素（1）,（-）-5,7,3′,4′,5′-五羟基黄烷（2）,（-）-表没食子儿茶素-7-没食子酸酯（3）,（-）-5,3′,4′,5′-四羟基黄烷-7-没食子酸酯（4）,槲皮素-3-O-α-L-吡喃鼠李糖苷（5）,杨梅树皮素-3-O-α-L-吡喃鼠李糖苷（6）,没食子酸（7）,没食子酸乙酯（8）。结论化合物3和8为首次从该属植物中分离得到,化合物1为首次从该种植物中分离得到;化合物3能显著抑制ConA诱导的T淋巴细胞增殖,其IC50为4.4μmol·L^-1。

Chemical constituents from Pithecellobium clypearia and their effects on T lymphocytes proliferation

Aim To investigate the chemical constituents from the twigs and leaves of Pithecellobium clypearia Benth and their immunomodulatory effects. Methods The constituents were separated and purified by various chromatographic methods and their structures were identified on the basis of spectral analysis. The immufiomodulatory effects of all the compounds were examined by a Con A-induced T lymphocytes proliferation assay. Results Eight compounds were isolated and identified as （-）- epigallocatechin （1）, （-）-5, 7, 3′, 4′, 5′-pentahydroxyflavan （2）, （-）-epigallocatechin-7-gallate （3）, （-）-5, 3′, 4′, 5′-tetrahydroxyfiavan- 7-gallate （4）, quercitin-3-O-α-L-rhamnpyranoside （5）, myricitin-3-O-α-L-rhamnpyranoside （6）, gallic acid （7）, and ethyl gallate （8）, respectively. Conclusion Compounds 3 and 8 were isolated from this genus for the first time, and compound 1 was isolated from this species for the first time. Compound 3 exhibited a strong inhibition on the T lymphocytes proliferation induced by Con A with an IC50 of 4.4 μmol·L^-1.