From bioinformatics to anti-inflammation and immune regulation: ACT001 in lipopolysaccharide-induced lung injury
Main Article Content
Keywords
ACT001, acute lung injury, NLRP3, pyroptosis, single and spatial transcriptomics
Abstract
Background: ACT001 is a potent anti-inflammatory small-molecule drug. However, the single cell and spatial molecular basis of pyroptosis and whether ACT001 exerts a therapeutic effect by preventing pyroptosis on acute lung injury (ALI) remains unclear.
Methods: The bioinformatics approach was employed to identify single cell and spatial landscape of nucleotide-binding domains and leucine-rich repeat protein 3 (NLRP3)-dependent pyroptosis in lipopolysaccharide (LPS) and influenza virus-induced ALI. Molecular docking was performed to elucidate the relationship between ACT001 and NLRP3. LPS-induced ALI mice model was established. Histopathological analysis and bronchoalveolar lavage fluid collection were conducted to investigate the anti-inflammatory and protective effects. In vitro experiments were also performed on bone marrow–derived macrophages to explore the effect of ACT001 on the balance of mitochondrial fusion and fission protein.
Results: Single cell transcriptomic and spatial transcriptomic analysis predicted that NLRP3-dependent pyroptosis significantly correlated with the development of ALI both in single cell and spatial distribution. Molecular docking provided a stable and reliable docking between ACT001 and NLRP3. ACT001 improved the 7-day survival of mice by approximately 50% over the loading dose of LPS-induced ALI. ACT001 (5 uM) attenuated the disruption of mitochondrial integrity and reactive oxygen species. Further, ACT001 reduced the overexpression of the mitochondrial fission protein DRP1 without affecting fusion protein Mitofusin2 levels. Moreover, ACT001 exerted a similar protective effect of suppressing pyroptosis as the DRP1-inhibitor Mdivi-1.
Conclusions: Our study revealed that pyroptosis genes were highly expressed in single-cell and spatial mapping along the first week of ALI occurrence. ACT001 attenuates ALI by reducing the NLRP3-dependent pyroptosis and balancing mitochondrial fission and fusion.
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