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The long persistence of pyrrolizidine alkaloid-derived pyrrole-protein adducts in vivo: Kinetic study following multiple exposures of a pyrrolizidine alkaloid containing extract of Gynura japonica
Toxicology Letters ( IF 2.9 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.toxlet.2020.01.021
Yan Chen 1 , Fen Xiong 1 , Weiqian Wang 1 , Kaiyuan Jiang 1 , Xuanling Ye 1 , Gang Deng 1 , Changhong Wang 2 , Li Yang 2 , Aizhen Xiong 2 , Zhengtao Wang 2
Affiliation  

Gynura japonica (also named Tusanqi in Chinese) is used as a folk herbal medicine for treating blood stasis or traumatic injury. However, hundreds of hepatic sinusoidal obstruction syndrome (HSOS) cases have been reported after consumption of preparations made from G. japonica because it contains large amounts of hepatotoxic pyrrolizidine alkaloids (PAs). To date, blood pyrrole-protein adducts (PPAs) are suggested as biomarkers for the diagnosis of PA-induced HSOS in clinics. However, the concentration of PPAs in the blood is greatly affected by several factors including the amount of PA exposure, herb intake period, and blood sampling time after the last exposure. In present study, the kinetic characters of PPAs in serum and liver as well as other potential target organs were studied systematically and comprehensively following multiple exposures of PAs in G. japonica extract (GJE). As results, PPAs content reached to a plateau both in serum and liver after the mice were treated with GJE for 2 weeks on daily basis. PPAs cleared significantly slower in liver (T1/2ke∼184.6 h, ∼7.7 days) than in serum (T1/2ke∼95.8 h, ∼4.0 days). Although more than 90% PPAs were removed 2 weeks after the last dosing, PPAs still persisted in the liver until the end of the experiment, i.e. 8 weeks after the last dosing. The results would be of great help for understanding the importance of PPAs for PA-induced toxicity and its detoxification.

中文翻译:

吡咯里西啶生物碱衍生的吡咯-蛋白质加合物在体内的长期持久性:多次暴露含有 Gynura japonica 提取物的吡咯里西啶生物碱后的动力学研究

Gynura japonica(中文又名土三七)是一种民间草药,用于治疗瘀血或外伤。然而,在食用由 G. japonica 制成的制剂后,已有数百例肝窦阻塞综合征 (HSOS) 病例报告,因为它含有大量的肝毒性吡咯里西啶生物碱 (PA)。迄今为止,血液吡咯蛋白加合物 (PPA) 被建议作为临床诊断 PA 诱导的 HSOS 的生物标志物。然而,血液中 PPA 的浓度受多种因素影响很大,包括 PA 暴露量、草药摄入时间和最后一次暴露后的采血时间。在目前的研究中,在多次暴露于 G. japonica 提取物 (GJE) 中后,系统全面地研究了 PPAs 在血清和肝脏以及其他潜在靶器官中的动力学特征。结果,每天用 GJE 治疗小鼠 2 周后,血清和肝脏中的 PPA 含量均达到稳定水平。PPAs 在肝脏(T1/2ke~184.6 小时,~7.7 天)中的清除速度明显慢于血清(T1/2ke~95.8 小时,~4.0 天)。尽管在最后一次给药后 2 周内去除了超过 90% 的 PPA,但 PPA 仍然存在于肝脏中直到实验结束,即在最后一次给药后 8 周。该结果将有助于理解 PPA 对 PA 诱导的毒性及其解毒的重要性。每天用 GJE 治疗小鼠 2 周后,PPAs 含量在血清和肝脏中均达到稳定水平。PPAs 在肝脏(T1/2ke~184.6 小时,~7.7 天)中的清除速度明显慢于血清(T1/2ke~95.8 小时,~4.0 天)。尽管在最后一次给药后 2 周内去除了超过 90% 的 PPA,但 PPA 仍然存在于肝脏中直到实验结束,即在最后一次给药后 8 周。该结果将有助于理解 PPA 对 PA 诱导的毒性及其解毒的重要性。每天用 GJE 治疗小鼠 2 周后,PPAs 含量在血清和肝脏中均达到稳定水平。PPAs 在肝脏(T1/2ke~184.6 小时,~7.7 天)中的清除速度明显慢于血清(T1/2ke~95.8 小时,~4.0 天)。尽管在最后一次给药后 2 周内去除了超过 90% 的 PPA,但 PPA 仍然存在于肝脏中直到实验结束,即在最后一次给药后 8 周。该结果将有助于理解 PPA 对 PA 诱导的毒性及其解毒的重要性。最后一次给药后 8 周。该结果将有助于理解 PPA 对 PA 诱导的毒性及其解毒的重要性。最后一次给药后 8 周。该结果将有助于理解 PPA 对 PA 诱导的毒性及其解毒的重要性。
更新日期:2020-05-01
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