E3 ligase c-Cbl regulates intestinal inflammation through suppressing fungi-induced noncanonical NF-κB activation.
E3 ligase c-Cbl regulates intestinal inflammation through suppressing fungi-induced noncanonical NF-κB activation.
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E3连接酶c-Cbl通过抑制真菌诱导的非典型NF-κB活化来调节肠道炎症。
DOI:
10.1126/sciadv.abe5171
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发表时间:
2021-05
期刊:
影响因子:
13.6
通讯作者:
Jia XM
中科院分区:
文献类型:
--
作者:
Duan JL;He HQ;Yu Y;Liu T;Ma SJ;Li F;Jiang YS;Lin X;Li DD;Lv QZ;Ma HH;Jia XM
c-Cbl suppresses RelB activation to facilitate protective benefits of commensal fungi and maintain intestinal homeostasis. Intestinal fungi are critical for modulating host immune homeostasis and underlying mechanisms remain unclear. We show that dendritic cell (DC)–specific deficiency of casitas B-lineage lymphoma (c-Cbl) renders mice susceptible to dextran sodium sulfate (DSS)–induced colitis. Mechanistically, we identify that c-Cbl functions downstream of Dectin-2 and Dectin-3 to mediate the ubiquitination and degradation of noncanonical nuclear factor κB subunit RelB. Thus, c-Cbl deficiency in DCs promotes α-mannan–induced activation of RelB, which suppresses p65-mediated transcription of an anti-inflammatory cytokine gene, il10, thereby aggravating DSS-induced colitis. Moreover, suppressing fungal growth with fluconazole or inhibition of RelB activation in vivo attenuates colitis in mice with DC-specific deletion of c-Cbl. We also demonstrate an interaction between c-Cbl and c-Abl tyrosine kinase and find that treatment with DPH, a c-Abl agonist, synergistically increases fungi-induced c-Cbl activation to restrict colitis. Together, these findings unravel a previously unidentified fungi-induced c-Cbl/RelB axis that sustains intestinal homeostasis and protects against intestinal inflammation.
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