A Drosophila ortholog of Toll‐like receptors modulates c‐Jun N‐terminal kinase signaling and protects against tau‐mediated neurodegeneration independent of innate immune response

Innate immunity is dysregulated in aging and neurodegenerative diseases, and Toll‐like receptors (TLRs) play a central role in innate immune response. Nine Toll family receptors (Toll‐1 to Toll‐9) exist in Drosophila, and Toll‐9 is structurally most closely related to mammalian TLRs such as TLR1, 2, 6, 10. However, physiological roles of Toll‐9 in innate immunity and neurodegeneration are largely unknown. In this study, we examined roles of Toll‐9 in fly brains under neurodegenerative conditions.