TY - JOUR AU - Park, Soyi AU - Jo, Yong Hun AU - Park, Ki Beom AU - Ko, Hye Jin AU - Kim, Chang Eun AU - Bae, Young Min AU - Kim, Bobae AU - Jun, Sung Ah AU - Bang, In Seok AU - Lee, Yong Seok AU - Kim, Yu Jung AU - Han, Yeon Soo PY - 2019 M3 - Original Research TI - TmToll-7 Plays a Crucial Role in Innate Immune Responses Against Gram-Negative Bacteria by Regulating 5 AMP Genes in Tenebrio molitor JO - Frontiers in Immunology UR - https://www.frontiersin.org/articles/10.3389/fimmu.2019.00310 VL - 10 SN - 1664-3224 N2 - Although it is known that the Drosophila Toll-7 receptor plays a critical role in antiviral autophagy, its function in other insects has not yet been reported. Here, we have identified a Toll-like receptor 7 gene, TmToll-7, in the coleopteran insect T. molitor and examined its potential role in antibacterial and antifungal immunity. We showed that TmToll-7 expression was significantly induced in larvae 6 h after infection with Escherichia coli and Staphylococcus aureus and 9 h after infection with Candida albicans. However, even though TmToll-7 was induced by all three pathogens, we found that TmToll-7 knockdown significantly reduced larval survival to E. coli, but not to S. aureus, and C. albicans infections. To understand the reasons for this difference, we examined the effects of TmToll-7 knockdown on antimicrobial peptide (AMP) gene expression and found a significant reduction of E. coli-induced expression of AMP genes such as TmTenecin-1, TmDefensin-1, TmDefensin-2, TmColeoptericin-1, and TmAttacin-2. Furthermore, TmToll-7 knockdown larvae infected with E. coli showed significantly higher bacterial growth in the hemolymph compared to control larvae treated with Vermilion dsRNA. Taken together, our results suggest that TmToll-7 plays an important role in regulating the immune response of T. molitor to E. coli. ER -