TY - JOUR
T1 - The STING1-MYD88 complex drives ACOD1/IRG1 expression and function in lethal innate immunity
AU - Chen, Feng
AU - Wu, Runliu
AU - Liu, Jiao
AU - Kang, Rui
AU - Li, Jinbao
AU - Tang, Daolin
N1 - Funding Information:
We thank Dave Primm (Department of Surgery, University of Texas Southwestern Medical Center) for his critical reading of the article. J.L. is supported by a grant from the National Natural Science Foundation of China ( 81830048 ).
Publisher Copyright:
© 2022 The Author(s)
PY - 2022/7/15
Y1 - 2022/7/15
N2 - ACOD1 (also known as IRG1) has emerged as a regulator of immunometabolism that operates by producing metabolite itaconate. Here, we report a key role of STING1 (also known as STING and TMEM173) in mediating ACOD1 expression in myeloid cells in response to toll-like receptor (TLR) signaling. The activation of STING1 through exogenous cyclic dinucleotides (e.g., 3′3′-cGAMP) or endogenous gain-of-function mutation (e.g., V155M) enhances lipopolysaccharide-induced ACOD1 expression and itaconate production in macrophages and monocytes, whereas the deletion of STING1 blocks this process. The adaptor protein MYD88, instead of DNA sensor cyclic GMP-AMP synthase (CGAS), favors STING1-dependent ACOD1 expression. Mechanistically, MYD88 directly blocks autophagic degradation of STING1 and causes subsequent IRF3/JUN-mediated ACOD1 gene transcription. Consequently, the conditional deletion of STING1 in myeloid cells fails to produce ACOD1 and itaconate, thereby protecting mice against endotoxemia and polymicrobial sepsis. Our results, therefore, establish a direct link between TLR4 signaling and ACOD1 expression through the STING1-MYD88 complex during septic shock.
AB - ACOD1 (also known as IRG1) has emerged as a regulator of immunometabolism that operates by producing metabolite itaconate. Here, we report a key role of STING1 (also known as STING and TMEM173) in mediating ACOD1 expression in myeloid cells in response to toll-like receptor (TLR) signaling. The activation of STING1 through exogenous cyclic dinucleotides (e.g., 3′3′-cGAMP) or endogenous gain-of-function mutation (e.g., V155M) enhances lipopolysaccharide-induced ACOD1 expression and itaconate production in macrophages and monocytes, whereas the deletion of STING1 blocks this process. The adaptor protein MYD88, instead of DNA sensor cyclic GMP-AMP synthase (CGAS), favors STING1-dependent ACOD1 expression. Mechanistically, MYD88 directly blocks autophagic degradation of STING1 and causes subsequent IRF3/JUN-mediated ACOD1 gene transcription. Consequently, the conditional deletion of STING1 in myeloid cells fails to produce ACOD1 and itaconate, thereby protecting mice against endotoxemia and polymicrobial sepsis. Our results, therefore, establish a direct link between TLR4 signaling and ACOD1 expression through the STING1-MYD88 complex during septic shock.
KW - Biological sciences
KW - Immune response
KW - Immunology
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U2 - 10.1016/j.isci.2022.104561
DO - 10.1016/j.isci.2022.104561
M3 - Article
C2 - 35769880
AN - SCOPUS:85132857394
SN - 2589-0042
VL - 25
JO - iScience
JF - iScience
IS - 7
M1 - 104561
ER -