[关键词]
[摘要]
目的 探讨丹参酮脂溶性成分自乳化释药系统(TC-SEDDS)的肠吸收特征。方法 采用大鼠在体单向肠灌流实验,以隐丹参酮、丹参酮I和丹参酮IIA 3个成分的吸收[吸收速率常数(Ka)和表观吸收系数(Papp)]为指标,研究其在十二指肠、空肠、回肠和结肠不同肠段的吸收情况;并考察不同药物质量浓度、P-糖蛋白(P-gp)抑制剂盐酸维拉帕米、多药耐药蛋白(MRP2)抑制剂丙磺舒和能量抑制剂2,4-二硝基苯酚对3个成分肠吸收的影响。结果 隐丹参酮、丹参酮I和丹参酮IIA在小肠全肠段均有吸收,且小肠上段(十二指肠)的吸收最佳;隐丹参酮和丹参酮I的吸收在实验质量浓度范围内(1.05~4.19 mg/L和1.22~5.56 mg/L)具有浓度依赖性,丹参酮IIA的吸收不受质量浓度(2.43~11.126 mg/L)影响;盐酸维拉帕米对隐丹参酮和丹参酮I的吸收无明显影响,却显著提高了丹参酮IIA的吸收;丙磺舒显著增加了隐丹参酮和丹参酮I的吸收,对丹参酮IIA的影响不显著;2,4-二硝基苯酚均能显著降低3个成分的吸收。结论 隐丹参酮和丹参酮I可能是MRP2的底物,不是P-gp底物。丹参酮IIA可能是P-gp底物,不是MRP2底物。3个成分的吸收均有能量的参与。隐丹参酮、丹参酮I和丹参酮IIA的吸收可能均有主动吸收过程。
[Key word]
[Abstract]
Objective To explore the intestinal absorption characteristics of tanshinone components self emulsifying drug delivery system (SEDDS). Methods In situ single-pass perfusion method was used to investigate the absorption characteristics of cryptonshinone, tanshinone I, and tanshinone IIA in rats. The absorption parameters (Ka, Papp) of cryptotanshinone, tanshinone I, and tanshinone IIA were used as indicators to study their optimum absorption site among duodenum, jejunum, ileum, and colon. The effects of verapamil hydrochloride (P-glycoprotein inhibitor, P-gp inhibitor), probenecid (multi-drug resistant protein MRP2), and 2, 4-dinitrophenol (energy inhibitor) on the absorption of cryptonshinone, tanshinone I, and tanshinone IIA were also studied, as well as the effects of their different concentration. Results Cryptonshinone, tanshinone I, and tanshinone IIA could be absorbed at all four intestinal segments, and the optimum absorption site was the upper segment of small intestine. The absorption of cryptotanshinone and tanshinone I were concentration-dependent at experimental concentration levels (1.05-4.19 mg/L and 1.22-5.56 mg/L), while tanshinone IIA was not affected obviously by its concentrations (2.43-11.12 mg/L). Verapamil hydrochloride had no significant influence on the absorption of cryptotanshinone or tanshinone I, while the absorption of tanshinone IIA was improved remarkably. Probenecid increased the absorption of cryptonshinone and tanshinone I apparently, while had no obvious effect on that of tanshinone IIA. 2,4-Dinitrophenol could decrease the absorption of cryptonshinone, tanshinone I, and tanshinone IIA apparently. Conclusion Cryptonshinone and tanshinone I are supposed to be the substrate of MRP2 instead of P-gp. Tanshinone IIA is supposed to be the substrate of P-gp, instead of MRP2. The energy participated in the absorption of cryptonshinone, tanshinone I, and tanshinone IIA. Active absorption maybe also involved in the absorption of cryptonshinone, tanshinone I, and tanshinone IIA.
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[基金项目]
九江学院课题(2015LGYB13);重庆市自然科学基金项目(cstc2012jjA1415);江西省教育厅课题(20173020)