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• W2091266567 abstract "Mortality in the host armyworm larvae Pseudaletia separata parasitized by the parasitic wasp Cotesia kariyai was dramatically increased when they were simultaneously infected by the entomopathogen Serratia marcescens . Previous studies have shown that this strong insecticidal effect is due to a metalloprotease‐like insecticide (MPLI) released from S. marcescens enterobacter. This study was conducted to elucidate the exact cause of the mortality resulting from MPLI. Injection of MPLI caused a sharp increase in hemolymph dopamine concentration followed by elevated levels of brain dopamine in armyworm larvae. [ 3 H]Dopamine injected into the hemocoel, was incorporated into the brains of MPLI‐injected larvae to a level eight times greater than in BSA‐injected control larvae. Transmission electron microscopy showed an obvious decrease in thickness and density of the brain sheath in insects injected with MPLI. This was probably due to the MPLI‐induced elevation of hemocyte metalloprotease activities. Further, electron microscopic and TUNEL staining analyses showed a significant increase in apoptotic cells in the brain 12 h after the injection. Injection of 3‐iodotyrosine (a tyrosine hydroxylase inhibitor) before MPLI completely prevented the increase in hemolymph dopamine in test larvae and their following death. From these observations, we conclude that MPLI‐injected larvae may have suffered mortal damage through increased apoptosis of brain cells caused by an influx of dopamine from the hemolymph." @default.
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• W2091266567 date "2003-07-29" @default.
• W2091266567 modified "2023-10-17" @default.
• W2091266567 title "Cause of mortality in insects under severe stress" @default.
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• W2091266567 doi "https://doi.org/10.1046/j.1432-1033.2003.03745.x" @default.
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