EFFECT OF MOSQUITO MIDGUT TRYPSIN ACTIVITY ON DENGUE-2 VIRUS INFECTION AND DISSEMINATION IN AEDES AEGYPTI

ALVARO MOLINA-CRUZ Department of Microbiology, Immunology and Pathology, and the Arthropod-borne and Infectious Diseases Laboratory, Colorado State University, Fort Collins, Colorado; Laboratory of Malaria and Vector Research, Medical Entomology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland

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LALITA GUPTA Department of Microbiology, Immunology and Pathology, and the Arthropod-borne and Infectious Diseases Laboratory, Colorado State University, Fort Collins, Colorado; Laboratory of Malaria and Vector Research, Medical Entomology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland

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JASON RICHARDSON Department of Microbiology, Immunology and Pathology, and the Arthropod-borne and Infectious Diseases Laboratory, Colorado State University, Fort Collins, Colorado; Laboratory of Malaria and Vector Research, Medical Entomology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland

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KRISTINE BENNETT Department of Microbiology, Immunology and Pathology, and the Arthropod-borne and Infectious Diseases Laboratory, Colorado State University, Fort Collins, Colorado; Laboratory of Malaria and Vector Research, Medical Entomology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland

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WILLIAM BLACK IV Department of Microbiology, Immunology and Pathology, and the Arthropod-borne and Infectious Diseases Laboratory, Colorado State University, Fort Collins, Colorado; Laboratory of Malaria and Vector Research, Medical Entomology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland

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CAROLINA BARILLAS-MURY Department of Microbiology, Immunology and Pathology, and the Arthropod-borne and Infectious Diseases Laboratory, Colorado State University, Fort Collins, Colorado; Laboratory of Malaria and Vector Research, Medical Entomology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland

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The effect of mosquito midgut trypsins in dengue serotype 2 flavivirus (DENV-2) infectivity to Aedes aegypti was studied. Addition of soybean trypsin inhibitor (STI) in a DENV-2 infectious blood meal resulted in a 91–97% decrease in midgut DENV-2 RNA copies (qRT-PCR analysis). STI treatment also resulted in slower DENV-2 replication in the midgut, less DENV-2 E protein expression, and decreased dissemination to the thorax and the head. A second uninfected blood meal, 7 days after the STI-treated infectious meal, significantly increased DENV-2 replication in the midgut and recovered oogenesis, suggesting that the lower viral infection caused by STI was in part due to a nutritional effect. Mosquitoes fed DENV-2 digested in vitro with bovine trypsin (before STI addition) exhibited a transient increase in midgut DENV-2 4 days postinfection. Blood digestion and possibly DENV-2 proteolytic processing, mediated by midgut trypsins, influence the rate of DENV-2 infection, replication, and dissemination in Ae. aegypti.

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