Betulinic acid 是一種天然的五環(huán)三萜類化合物，為真核細(xì)胞拓?fù)洚悩?gòu)酶 I (topoisomerase I) 的抑制劑，IC50 值為 5 μM，具有抗炎，抗瘧疾，抗艾滋病和抗腫瘤等活性。
Betulinic acid is a eukaryotic topoisomerase I inhibitor, with an IC50 of 5 μM, and prevents topoisomerase I-DNA interaction[1]. Betulinic acid (10, 20, 40, 80, and 160 μM) significantly suppresses MDA-MB-231 cell viability in a time- and dose-dependent manner after treatment for 24 or 48 h. Betulinic acid (20, 40 μM) causes decrease in Bcl-2 expression of MDA-MB-231 cells. Betulinic acid also induces morphological changes of MDA-MB-231 cells at 20 μM, and leads to ultrastructure changes of MDA-MB-231 cells at 40 μM[2]. Betulinic acid shows anti-HIV activities, with an EC50 of 1.4 μM in acutely infected H9 lymphocytes[4].
Betulinic acid (10 and 30 mg/kg, p.o.) significantly abrogates colon shortening, and reduces malondialdehyde (MDA) and lipid hydroperoxide levels in dextran sulfate sodium (DSS)-induced colitis in mice. Betulinic acid (30 mg/kg, p.o.) restores superoxide dismutase (SOD), catalase activity and glutathione (GSH) content to control levels in DSS-induced colitis in mice. Betulinic acid (30 mg/kg, p.o.) also inhibits the DSS-induced increase in inflammatory markers. Betulinic acid (3, 10, 30 mg/kg, p.o.) suppresses acetic acid-induced writhing responses and mustard oil (MO)-induced visceral nociception in mice[3].
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