Fatty acid synthesis promotes inflammasome activation through NLRP3 palmitoylation.
Cell Rep
; 43(8): 114516, 2024 Aug 27.
Article
em En
| MEDLINE
| ID: mdl-39024103
ABSTRACT
Despite its significance, the role of lipid metabolism in NLRP3 inflammasome remains elusive. Here, we reveal a critical role for fatty acid synthase (FASN) in NLRP3 inflammasome activation. We demonstrate that pharmacological or genetic depletion of FASN dampens NLRP3 activation in primary mouse and human macrophages and in mice. This disruption in NLRP3 activation is contingent upon FASN activity. Accordingly, abolishing cellular palmitoylation, a post-translational modification in which the FASN product palmitate is reversibly conjugated to cysteine residues of target proteins, blunts inflammasome signaling. Correspondingly, an acyl-biotin exchange assay corroborated NLRP3 palmitoylation. Mechanistically, Toll-like receptor (TLR) ligation introduces palmitoylation at NLRP3 Cys898, permitting NLRP3 translocation to dispersed trans-Golgi network (dTGN) vesicles, the site of inflammasome assembly, upon NLRP3 activation. Accordingly, the NLRP3 Cys898 mutant exhibits reduced palmitoylation, limited translocation to the dTGN compartment, and diminished inflammasome activation. These results underscore mechanistic insights through which lipid metabolism licenses NLRP3 inflammasome assembly and activation.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Lipoilação
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Inflamassomos
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Proteína 3 que Contém Domínio de Pirina da Família NLR
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article