Amuc_1100 pretreatment alleviates acute pancreatitis in a mouse model through regulating gut microbiota and inhibiting inflammatory infiltration
Amuc_1100 is a membrane protein from Akkermansia muciniphila , which has been found to play a role in host immunological homeostasis in the gastrointestinal tract by activating TLR2 and TLR4. In this study we investigated the effects and underlying mechanisms of Amuc_1100 on acute pancreatitis (AP)...
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Veröffentlicht in: | Acta pharmacologica Sinica 2024-03, Vol.45 (3), p.570-580 |
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Sprache: | eng |
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Zusammenfassung: | Amuc_1100 is a membrane protein from
Akkermansia muciniphila
, which has been found to play a role in host immunological homeostasis in the gastrointestinal tract by activating TLR2 and TLR4. In this study we investigated the effects and underlying mechanisms of Amuc_1100 on acute pancreatitis (AP) induced in mice by intraperitoneal injection of caerulein and lipopolysaccharide (LPS). The mice were treated with the protein Amuc_1100 (3 μg, i.g.) for 20 days before caerulein injection. Cecal contents of the mice were collected for 16S rRNA sequencing. We found that pretreatment with Amuc_1100 significantly alleviated AP-associated pancreatic injury, reduced serum amylase and lipase. Amuc_1100 pretreatment significantly inhibited the expression of proinflammatory cytokines (TNF-α, IL-1β, IFN-γ and IL-6) in spleen and pancreas through inhibiting NF-κB signaling pathway. Moreover, Amuc_1100 pretreatment significantly decreased the inflammatory infiltration, accompanied by the reduction of Ly6C
+
macrophages and neutrophils in the spleen of AP mice. Gut microbiome analysis showed that the abundance of
Bacteroidetes
,
Proteobacteria
,
Desulfobacterota
and
Campilobacterota
was decreased, while the proportion of
Firmicutes
and
Actinobacteriota
was increased in AP mice pretreated with Amuc_1100. We further demonstrated that Amuc_1100 pretreatment restored the enrichment of tryptophan metabolism, which was mediated by intestinal flora. These results provide new evidence that Amuc_1100 lessens the severity of AP through its anti-inflammatory properties with a reduction of macrophages and neutrophil infiltration, as well as its regulation of the composition of intestinal flora and tryptophan metabolism. |
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ISSN: | 1671-4083 1745-7254 |
DOI: | 10.1038/s41401-023-01186-4 |