Didymin attenuates doxorubicin-induced cardiotoxicity by inhibiting oxidative stress

Objective: This study was designed to investigate the protective effects of didymin (Did) on doxorubicin (DOX)-induced cardiotoxicity. Methods: After pretreatment with Did (2, 4, 8 mg/kg intraperitoneal i.p.) for 7 d, the male C57 mice were injected with single dose of DOX (20 mg/kg i.p.). The cardioprotective effect of Did was observed on the 7th day after DOX treatment. Results: DOX delayed body growth and caused cardiac tissue injury, oxidative stress, and mitochondrial dysfunction. Similar experiments in H9C2 cardiomyocytes showed that DOX reduced cell viability, increased generation of reactive oxygen species (ROS) and fragmentation of DNA, decreased mitochondrial membrane potential, and induced cardiomyocyte apoptosis. However, all of these adverse effects were suppressed by Did pretreatment. Did increased protein expression of glutamate-L-cysteine ligase catalytic subunit (GCL), heme oxygenase 1 (HO-1), and nuclear factor erythroid 2-related factor 2 (Nrf2). Besides, Did also induced activation of PI3K/AKT. Conclusion: These findings indicated Did prevented DOX-induced cardiac injury and apoptosis via activating PI3K/AKT/Nrf2 signaling pathway.     

HPLC-MS/MS法同时测定薄荷药材中4种黄酮苷的含量

目的 建立HPLC-MS/MS同时测定薄荷药材中橙皮苷、香叶木苷、香蜂草苷、蒙花苷4种黄酮苷含量的方法.方法 采用Inertsil ODS-3色谱柱(4.6×150 mm,5μm),柱温30℃,流动相为甲醇-0.1％甲酸水,以0.5 mL/min的流速梯度洗脱,进样量2μL;质谱条件:采用电喷雾离子源进行正离子模式检测,多反应监测模式(MRM)用于定量测定.结果 薄荷药材中4种成分橙皮苷、香叶木苷、香蜂草苷和蒙花苷能完全分离;峰面积与浓度呈良好的线性关系.平均回收率(n=6)分别为99.40％、98.63％、99.08％、98.62％,RSD分别为2.5％、2.7％、2.6％、2.4％.结论 该方法简便、快速、准确、专属性高,适用于薄荷药材中橙皮苷、香叶木苷、香蜂草苷、蒙花苷含量的同时测定.