The Unfolded-Protein Response Triggers the Arthropod Immune Deficiency Pathway.
The Unfolded-Protein Response Triggers the Arthropod Immune Deficiency Pathway.
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DOI:
10.1128/mbio.00703-22
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发表时间:
2022-08-30
期刊:
影响因子:
6.4
通讯作者:
Shaw, Dana K.
中科院分区:
文献类型:
--
作者:
Sidak-Loftis, Lindsay C.;Rosche, Kristin L.;Pence, Natasha;Ujczo, Jessica K.;Hurtado, Joanna;Fisk, Elis A.;Goodman, Alan G.;Noh, Susan M.;Peters, John W.;Shaw, Dana K.
关键词:
The insect immune deficiency (IMD) pathway is a defense mechanism that senses and responds to Gram-negative bacteria. Ticks lack genes encoding upstream components that initiate the IMD pathway. Despite this deficiency, core signaling molecules are present and functionally restrict tick-borne pathogens. The molecular events preceding activation remain undefined. Here, we show that the unfolded-protein response (UPR) initiates the IMD network. The endoplasmic reticulum (ER) stress receptor IRE1α is phosphorylated in response to tick-borne bacteria but does not splice the mRNA encoding XBP1. Instead, through protein modeling and reciprocal pulldowns, we show that Ixodes IRE1α complexes with TRAF2. Disrupting IRE1α-TRAF2 signaling blocks IMD pathway activation and diminishes the production of reactive oxygen species. Through in vitro, in vivo, and ex vivo techniques, we demonstrate that the UPR-IMD pathway circuitry limits the Lyme disease-causing spirochete Borrelia burgdorferi and the rickettsial agents Anaplasma phagocytophilum and A. marginale (anaplasmosis). Altogether, our study uncovers a novel linkage between the UPR and the IMD pathway in arthropods.
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DOI:
10.1098/rstb.2019.0066
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