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Mechanistically, DRD2 forms a complex with TLR4, initiating MAPK3-dependent CREB1 phosphorylation and subsequent ACOD1 transcription. Conversely, dopamine disrupts TLR4-MYD88 interaction via DRD2 without affecting the formation of the LPS-induced TLR4-MD2-CD14 complex. Enhanced ACOD1 expression induces CD274\/PD-L1 production independently of itaconate, precipitating inflammation-associated immunosuppression in sepsis. Delayed administration of pramipexole, a dopamine agonist, mitigates lethality in bacterial sepsis mouse models. Conversely, the dopamine antagonist aripiprazole exacerbates sepsis mortality. 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