青蒿琥酯与萘酚喹联用延缓恶性疟原虫抗性实验研究

目的 探讨青蒿琥酯与萘酚喹联用是否能延缓恶性疟原虫抗性。方法 用青蒿琥酯与萘酚喹联用(A组)和单用青蒿琥酯(B组)间断刺激体外连续培养的恶性疟原虫，在接触药物前后不同时间用Reickmann体外微量测定恶性疟原虫的敏感性，同时观察每次接触药物后恶性疟原虫恢复正常生长时间。结果 A组用药前及用药后65d青蒿琥酯／萘酚喹的ID50分别为2．42／37．81、1．70／26．73nmol／L。B组用药前及用药后68、129d青蒿琥酯的ID50分别为9．60、30．61nmol／L和85．10nmol／L。A组接触药物后恶性疟原虫第1、2次恢复正常生长时间分别为24、37d，第3次接触药物后连续观察90d，疟原虫未能恢复正常生长。B组疟原虫平均恢复正常生长时间为16．7d。结论 可用体外间断药物刺激培育抗青蒿琥酯恶性疟原虫；青蒿琥酯与萘酚喹联用能有效延缓恶性疟原虫抗性。

STUDY ON ARTESUNATE COMBINED WITH NAPHTHOQUINE DELAYING RESISTANCE OF PLASMODIUM FALCIPARUM TO ARTESUNATE IN LABORATORY

Objective To understand whether or not artesunate (Art. ) combined with naphtho-quine (Nap. ) can delay the resistance of Plasmodium falciparum to Art. Methods In Group A, P. falciparum was cultured in culture medium and was stimulated by Art/Nap disconnectedly, and in Group B, stimulated by Art disconnectedly. When P. falciparum recovered to normal growth level, the changes of sensitivity (ID50) to the drugs were compared between the two groups after P. falciparum touched on the drug. Results In Group A, the times P. falciparum recovered to normal growth level were 24, 37 d respectively when it contacted the drugs in the first and second times; P. falciparum didn't recover to normal growth level in 90 d when it contacted the drugs in the third time. In Group B, the times P. falciparum recovered to normal growth level were 16. 7 d (15-20) on average. ID50(s) of Art/Nap were 2.42/37.81, 1. 70/26.30 nmol/L before and 65 d after contacting the drugs in Group A; ID50(s) of Art were 9. 60, 30. 61, 85.12 nmol/L before and 68 and 129 d after contacting the drug in Group B. Conclusion Artesunate-resistant P. falciparum can be cultured by touching artesunate at intervals in vitro; Artesunate combined with naph-thoquine may delay the resistance of P. falciparum to artesunate in vitro.