Effects of Plagiorchis elegans (Trematoda: Plagiorchiidae) infection on the carbohydrate metabolism of fourth instar Aedes aegypti (Diptera: Culicidae).
Infection of fourth-instar Aedes aegypti (L.) with the entomopathogenic digenean Plagiorchis elegans (Rudolphi) alters the carbohydrate metabolism of the insect. Within 24 h of cercarial penetration, total body extracts of infected fourth instars exhibited decreased trehalase activity, increased trehalose-6-phosphatase activity, and a concomitant accumulation of trehalose when compared with uninfected larvae. The amounts of glucose, glycogen and lipids, and the activity of glycogen phosphorylase a were similar in extracts of infected and control larvae. The predominant fatty acids, in both control and infected larvae, were C 18:0, C 18:1, and C 18:3. There were no significant differences in the types or proportions of fatty acids found in control and infected larvae. Parasitic infection is discussed in terms of impaired trehalose metabolism.
Wallage
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HR
Department of Natural Resource Sciences, McGill University, Ste-Anne-de-Bellevue, QC, Canada.
Niven
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DF
Rau
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ME
D000330:Aedes / Q000378:metabolism* / Q000469:parasitology*; D000818:Animals; D050260:Carbohydrate Metabolism; D005947:Glucose / Q000378:metabolism; D006003:Glycogen / Q000378:metabolism; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D006005:Phosphorylases / Q000378:metabolism; D014198:Trehalase / Q000378:metabolism; D014199:Trehalose / Q000378:metabolism; D014200:Trematoda / Q000502:physiology*
D006003:Glycogen; D014199:Trehalose; D006005:Phosphorylases; C023178:trehalose-phosphatase; D010744:Phosphoric Monoester Hydrolases; D014198:Trehalase; D005947:Glucose