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中国临床药理学与治疗学 ›› 2005, Vol. 10 ›› Issue (6): 709-712.

• 研究原著 • 上一篇    下一篇

新的核苷类似物β-L-D4A 的细胞内代谢与生物转化

吴金明, 林菊生1, 章金艳1, 梁扩寰1   

  1. 温州医学院附属第一医院, 温州325000, 浙江; 1华中科技大学同济医学院同济医院肝病研究所, 武汉430030, 湖北
  • 收稿日期:2005-03-25 修回日期:2005-04-28 出版日期:2005-06-26 发布日期:2020-11-12
  • 通讯作者: 吴金明, 男, 医学博士, 副教授, 研究方向:乙型肝炎的基础与临床。Tel:(0) 13587694167 E-mail: phdwu0003@yahoo.com.cn
  • 基金资助:
    国家自然科学基金资助项目(NO39970858)

Intracellular metabolism and bioconversion of β-L-D4A

WU Jin-ming, LIN Ju-sheng1, ZHANG Jin-yan1, LIANG Kuo-huan1   

  1. Department of Gastroenterology, the first Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, Zhejiang, China; 1Institute of Liver Disease, Tongji Hospital, TongjiMedical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, China
  • Received:2005-03-25 Revised:2005-04-28 Online:2005-06-26 Published:2020-11-12

摘要: 目的: 研究β-L-D4A 在2.2.15 细胞内的代谢情况, 以便为进一步明确其抗HBV 作用机制和动物体内实验及人体内试验研究其抗HBV 作用与药代动力学奠定基础。方法: 以2 μmol·L-1 [3H] β-LD4A或[3H] β-D-D4A 处理2.2.15 细胞2 、4 、8 、12 、24 h, 再以0.4 mol·L-1预冷的高氯酸(含0.08 mol·L-1磷酸三乙胺) 抽提, 离心后, 溶解于酸的上清液,直接进行HPLC 分离、相连的紫外检测器检测, 然后分析各个峰值。结果: 两化合物均出现4 峰, 且出现时间一致, 保留时间依次在6 、10 、19 、28 min, 24 h 处理后, β-L-D4A 细胞内代谢峰明显高于β-D-D4A 的代谢峰;β-L-D4A 于2.2.15 细胞内代谢进行了动态的检测, 发现细胞内代谢物的含量于加药后迅速增加, 以三磷酸形式增加最快, 至8 h 时, 达到最大值,以后开始缓慢降低;β-L-D4A 处理2.2.15 细胞24 h后, 换用不含药培养基继续培养, 停药后3 种磷酸化代谢物含量于前8 h 迅速减少, 继后16 h 降低缓慢, 于24 h 时, 仍有8 h 时35.6 %(0.32 0.9) 的三磷酸化合物存在。结论: β-L-D4A 较之β-D-D4A 更易被磷酸化代谢;一磷酸化过程可能为限速步骤;β-LD4A三磷酸化物在2.2.15 细胞内降解缓慢。

关键词: 核苷类似物, β-L-D4A, 乙型肝炎病毒, 2.2.15 细胞代谢, 生物转化

Abstract: AIM: To investigate the metabolism of β-L-D4A in 2.2.15 cells for further clarifying its anti-HBV mechanism and establishing a background on the studies of its anti-HBV effect and pharmacokinetics in animal model and human body. METHODS: 2.2.15 cells were treated with [3H] β-L-D4A or [3H] β-D-D4A at 2 μmol·L-1 concentrations for 2, 4, 8, 12 and 24 hours, then the cells were extracted by adding 0.4 mol·L-1 perchloric acid containing 0.08 mol·L-1 triethylammonium phosphate. Then it centrifuged at 1 000 ×g for 5 min, the acid-soluble supernatant were directly isolated immediately by HPLC and monitored by connected ultraviolet detector, then the peaks were analyzed. RESULTS: Both of the two compounds present 4 peaks of metabolites, and the emergence time of each corresponding metabolite peak were similar. The retention times for β-LD4A, mono-, di and triphosphates were 6, 10, 19 and 28 min, respectively. Peaks for β-L-D4A metabolites were significantly higher than that for β-D-D4A metabolites in 2.2.15 cells after treated with each of the compounds for 24 h. Rapid conversion of β-L-D4A to its phosphorylated forms could be seen, especially for triphosphorylated form.With the concentrations used, maximal metabolite formation was observed at 8 h, then the metabolites began to reduce gradually. After 24 h treatment, when β-L-D4A was withdrawn, the levels of mono-, di, and triphosphates dropped rapidly in the first 8 h. In the subsequent 16 h, the triphosphate was removed at a lower rate, with 35.6 %of the triphosphate still present at 24 h in comparison with the amounts at 8 h. CONCLUSION: β-LD4A can be more easily phosphated metabolism than β-DD4A in 2.2.15 cells. Monophosphorylation may be the rate-limiting step. Triphosphate of β-L-D4A is degraded at a lower rate in 2.2.15 cells, and it may have a longer half-life.

Key words: nucleoside, analogue, β-L-D4A, hepatitis B virus, 2.2.15 cells, metabolism, bioconversion

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