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In a previous study, we demonstrated that oral immunization using  Autographa californica  baculovirus driving the expression of the Gal-lectin LC3 fragment (AcNPV-LC3) of  Entamoeba histolytica  conferred protection against ALA development in hamsters. In this study, we determined the ability of AcNPV-LC3 to protect against ALA by the intramuscular route as well as the liver immune response associated with protection. Results showed that 55% of hamsters IM immunized with AcNPV-LC3 showed sterile protection against ALA, whereas other 20% showed reduction in the size and extent of abscesses, resulting in some protection in 75% of animals compared to the sham control group. Levels of protection showed a linear correlation with the development and intensity of specific antiamoeba cellular and humoral responses, evaluated in serum and spleen of hamsters, respectively. Evaluation of the Th1/Th2 cytokine patterns expressed in the liver of hamsters showed that sterile protection was associated with the production of high levels of IFN γ  and IL-4. These results suggest that the baculovirus system is equally efficient by the intramuscular as well as the oral routes for ALA protection and that the Gal-lectin LC3 fragment is a highly protective antigen against hepatic amoebiasis through the local induction of IFN γ  and IL-4.

biomed research international

Protection against Amoebic Liver Abscess in Hamster by Intramuscular Immunization with an<i>Autographa californica</i>Baculovirus Driving the Expression of the Gal-Lectin LC3 Fragment

Protection against Amoebic Liver Abscess in Hamster by Intramuscular Immunization with anAutographa californicaBaculovirus Driving the Expression of the Gal-Lectin LC3 Fragment