Journal: Critical Care
Article Title: ApoA1/HDL and sepsis-associated vascular endothelial injury: a narrative review
doi: 10.1186/s13054-025-05668-1
Figure Lengend Snippet: Mechanism by which ApoA1 Inhibits Vascular Endothelial Inflammation. Lipid-free ApoA1 protein or its mimetic peptides interact with the ABCA1 receptor (a 12-transmembrane protein located in non-raft membrane domains, which has poor cholesterol) on macrophages. Concurrently, ApoA1 within (r)HDL interacts with the scavenger receptor SR-B1 (located in cholesterol-rich lipid raft domains). Both interactions promote the efflux of free cholesterol from macrophages to ApoA1 (indicated by a yellow straight arrow). Notably, the cholesterol efflux regulatory protein AIBP (ApoA1-Binding Protein) enhances the binding of ApoA1 to the ABCA1 receptor. Pathway ①: Inhibition of TLR4 consequently suppresses its downstream pro-inflammatory signaling pathways. Pathways ② and ③: Signaling pathways that inhibit inflammation, initiated respectively by the binding of ApoA1 to the ABCA1 receptor and HDL to the SR-B1 receptor. Pathway ④: Reconstituted HDL (rHDL) inhibits LPS-stimulated activation of the NLRP3 inflammasome. Created with BioGDP.com
Article Snippet: APOA1 mimetic peptide 4 F , In vivo , Sprague - Dawley rats , 10 mg/kg; i.p. , CLP , , IL-6↓;HDL↑; survival rate↑ , [ ] .
Techniques: Membrane, Binding Assay, Inhibition, Protein-Protein interactions, Activation Assay