硝喹对鼠约氏疟原虫红内期超微结构的影响

感染约氏疟原虫的小鼠,灌服单剂量的硝喹(1mg/kg)后30min到24h,用光镜和透射电镜动态观察了红内期疟原虫的形态变化。结果发现,在光镜下,有些晚期滋养体核大而不能分裂,有些原虫胞浆中有散在的圆形红色颗粒,这些红色颗粒可能是电镜中观察到的自噬泡或膜性残体。在电镜下,最早观察到的是原虫线粒体肿胀,基质空化,粗面内质网扩张和排列紊乱,核糖体脱落和解聚。随后原虫膜性结构增生,在胞浆中形成多层螺纹膜或髓鞘样结构,核膜肿胀,增生,核周间隙增宽。药物作用晚期,原虫结构瓦解,形成大量自噬泡。结果表明,硝喹干扰了疟原虫的膜系统,胞浆系统和细胞核的结构和功能,从多个环节发挥其抗疟效应。

The effects of nitroquine on the ultrastructures of nitraery-throcytic stage of Plasmodium yoelii in mice

After a single oral dosed mg/kg) of nitroquine to the mice infected with Plasmodium yoelii,the morphological changes of the parasites were studied with optical and electron microscopy.Enlarged nucleus and some red granules scattered over the cytoplasm in the late trophozoites were observed under optical microscope,which may correspond to the autophagocytic vacuo-les or membranous residual bodies seen under electron microscope.Thirty minutes after the drug administration,the number of mitochondria with matrix cavitation was increased,the endoplasmic reticulum dilated,and ribosomes separated,detached,or disaggregated.Then the pelliculous complex and nuclear membrane of the parasites proliferated to form multi-layered structure with spiral curv?s or myelin sheath-like structure in the cytoplasm.The nuclear membrane was swollen and proliferated and the perinuclear cisterna was widened.In the late stage of drug action,the structure of the parasites was broken down to form a large number of autophagocytes.The findings indicate that nitroquine interferes with the structure and function of the cell membrane,cytoplasm and nucleus of malaria parasites and exerts its anti-malarial effects from many aspects.