中国寄生虫学与寄生虫病杂志 ›› 2005, Vol. 23 ›› Issue (6): 10-427.

• 论著 • 上一篇    下一篇

中华硬蜱血小板集聚抑制剂的分离纯化与活性研究

刘勇厚1,2,徐春花3,刘至刚4,梁建国3,赖仞1,3*   

  1. 1 中国科学院昆明动物研究所,昆明650223;2 沈阳骨科医院,沈阳110044;3 南京农业大学生命科学学院,南京210095;4 深圳大学生命科学学院,深圳518060
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2005-12-30 发布日期:2005-12-30

Isolation and Purification of an Inhibitor on PlateletAggregation from Ixodes sinensis

LIU Yong-hou,XU Chun-hua,LIU Zhi-gang,LIANG Jian-guo,LAI Ren*   

  1. Kunming Institute of Zoology,Chinese Academy of Sciences, Kunming 650223,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-12-30 Published:2005-12-30

摘要: 目的 研究蜱类抗血小板集聚的生物活性成分,了解其与其宿主相互作用的分子机制。 方法 用葡聚糖Sephadex G?鄄50凝胶过滤及高效液相从半饱吸血的中华硬蜱(Ixodes sinensis)唾液腺中分离纯化具有血小板集聚抑制活性的蛋白质,用飞行质谱测定该抑制剂的分子量,并用兔富血小板血浆研究其血小板集聚抑制活性。 结果 通过液相分离,从中华硬蜱唾液腺中得到了一种血小板集聚抑制剂,用飞行质谱测定该抑制剂的相对分子质量(Mr )为8 065。该抑制剂对二磷酸腺苷(ADP)诱导的血小板集聚表现强烈的抑制活性,在浓度为10 μg/mL时,可以抑制90%以上的血小板集聚。 结论 首次分离获得中华硬蜱唾液腺血小板集聚抑制剂,该抑制剂对硬蜱顺利获取宿主血餐至关重要。

关键词: 中华硬蜱, 血小板集聚抑制剂, 丝氨酸蛋白酶, 活性, 血餐

Abstract:

Objective To study the bioactive components in ticks which inhibit platelet aggregation, and to understand the molecular mechanism of tick-host interaction. Methods Sephadex G-50 gel filtration and high performance liquid chromatography (HPLC) were used to purify the platelet aggregation inhibitor from Ixodes sinensis. Its molecular weight and purity were checked by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. Platelet-rich plasma (PRP) of rabbit was used to examine the function of platelet aggregation inhibitor. Results A purified platelet aggregation inhibitor was identified from I.sinensis with a molecular weight of 8 065. It inhibited platelet aggregation induced by ADP with strong potency. The inhibition of platelet aggregation reached over 90% under a concentration of 10 μg/ml. Conclusion An inhibitor of platelet aggregation from I.sinensis was identified, which may play an important role for ticks to successfully get blood meal from their hosts.

Key words: Ixodes sinensis, Platelet aggregation inhibitor, Serine protease, Activity, Blood meal