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Journal Article
Research Support, Non-U.S. Gov't
Gene expression and molecular characterization of a novel C-type lectin, encapsulation promoting lectin (EPL), in the rice armyworm, Mythimna separata.
Insect Biochemistry and Molecular Biology 2017 October
Insect cellular immune reactions differ depending on the target species. Phagocytosis is activated to scavenge microorganisms such as bacteria and fungi. On the other hand, larger invaders such as parasitoid wasps are eliminated by activation of encapsulation. In this study, we hypothesized that novel determinants regulate cellular immunities independent of surface molecular pattern recognition involving pattern recognition receptors (PRRs). Immune-related genes differentially expressed depending on the treated material size were screened in larval hemocytes of the rice armyworm, Mythimna separata. Consequently, we identified a novel C-type lectin gene up-regulated by injection of large beads but not small beads of identical material. Examination of in vitro effect of the recombinant protein on the immune reactions clarified that the protein activated encapsulation reaction, while it suppressed phagocytosis. These results suggest that this novel C-type lectin designated "encapsulation promoting lectin (EPL)" regulates cellular immunity by a novel immune target size-recognition mechanism.
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