Analysis of acquired immunity system in insects

昆虫具有先天免疫系统，其特点是与非特异性因素的免疫反应。虽然已知昆虫缺乏具有免疫记忆的获得性免疫，但昆虫是否具有免疫记忆仍存在争议。在这项研究中，我们发现用大肠杆菌注入家蚕可增加大肠杆菌再接种体中活的大肠杆菌细胞的清除率。此外，我们指出这种清除率的升高不是由体液免疫反应的激活引起的，而可能是由细胞反应的激活引起的。

Insects possess an innate immunity system that is characterized as immune reactions with non-specific factors. Although insects are known to lack an acquired immunity with immunological memory, it is still controversy whether insects have an immunological memory or not. In this study, we found that priming silkworm with E. coli increased clearance of living E. coli cells in the E. coli-reinoculated body. Furthermore, we indicated that the elevation of this clearance was not caused by activation of the humoral immune reactions, but probably by activation of the cellular reactions.