Comparison of Midgut Hemagglutination Activity in Three Different Geographical Populations of Anopheles stephensi

ABSTRACT

Lectins that agglutinate red blood cells [RBCs] were demonstrated in Anopheles stephensi mosquito midgut extracts using human [four groups A, B, AB and O, RH+] rat, sheep and rabbit blood cells. Only rabbit RBCs showed agglutination reaction against the midgut extracts. Significant differences in hemagglutinin titers and carbohydrate specifity were detected between male and female mosquitoes as well as among three different geographical populations of Anopheles stephensi from south of Iran. Overall agglutinin levels were increased following a blood meal. The highest hemagglintination titers were due to Kazerun population. All hemagglutination assays were versus rabbit RBCS. A significant difference was detected among the number of egg-float ridges. Iranshahr population was different from B and ar-abbas and Kazerun population in egg-float ridges number. B and r-abbas population was in the intermediate category. Iranshahr population fell between mysoransis and intermediate group and Kazerun population was between intermediate and type form. This study presents the first report on the occurrence of heterogeneous anti Rabbit RBC agglutinins in the midget extracts of the different geographical populations of An.stephensi with the sugar - binding specificities. The sugar- inhibition pattern was different between and within geographical population of An.stephensi