Changes of prophenoloxidase in the midguts of Anopheles stephensi and Anopheles dirus before and after infection with Plasmodium yoelii
- VernacularTitle:约氏疟原虫感染斯氏按蚊与大劣按蚊前后中肠前酚氧化酶的变化
- Author:
Zongwen QIU
;
Xilin ZHANG
;
Wenyue XU
;
Ying WANG
;
- Publication Type:Journal Article
- Keywords:
Plasmodium yoelii;
Anopheles stephensi;
Anopheles dirus;
midgut;
prophenoloxidase
- From:Journal of Third Military Medical University
1988;0(06):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the relationship between the immune defence reaction against Plasmodium infection and the prophenoloxidase (PPO) of the midgut by comparative analysis of the distributions and the changes of PPO in the midgut of Anopheles stephensi and Anopheles dirus before and after infection with Plasmodium yoelii . Methods Midguts were dissected out from both Anopheles stephensi and Anopheles dirus at 3, 5, 7, 11 and 15 d before and after infection with Plasmodium yoelii . Immunohistochemistry and Western blotting were performed respectively on the collected midguts using Manduca Sexta PPO IgG polyantibody. Results PPO in the midguts from both Anopheles stephensi and Anopheles dirus was mainly located in the circulation conduit of midgut before infection with Plasmodium yoelii , but aggregated and distributed at the interspace of midguts as pieced or/and stripped forms after infection. Furthermore, PPO in the midgut of Anopheles dirus was more concentrated than that of Anopheles stephensi . Western blotting revealed that the PPO band with about molecular weight of 67?10 3 was detected in the midguts of both Anopheles stephensi and Anopheles dirus before and after Plasmodium yoelii infection. There was significant difference before and after infection, and the PPO band was obviously enhanced after infection. PPO bands in the midgut of Anopheles dirus were more prominent than those of Anopheles stephensi . Conclusion PPO in the midgut of Anopheles mosquitoes may come from the hemolymph by the circulation conduit before Plasmodium yoelii infection. However, the different distributions and changes of PPO in the midguts resulted from the Anopheles mosquitoes infected with Plasmodia may be closely correlated with Plasmodia infection, which may be of important physiological significance and may be involved in the immune defensive reaction against Plasmodium .
