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The TLR4-TRIF-type 1 IFN-IFN-γ pathway is crucial for gastric MALT lymphoma formation after Helicobacter suis infection.

ABSTRACT: Helicobacter suis, a zoonotic infection-related bacterium, can induce gastric mucosa-associated lymphoid tissue (MALT) lymphoma in humans and animals. Recently, we reported that the formation of gastric MALT lymphoma after H. suis infection is induced by interferon (IFN)-γ activation. Here, we revealed that activation of the Toll-like receptor (TLR) 4-Toll/IL-1 receptor domain-containing adapter-inducing interferon-β (TRIF) pathway after H. suis infection is associated with the production of type 1 IFNs (IFN-α, IFN-β) by gastric epithelial cells. Additionally, these type 1 IFNs interact with type 1 IFN receptors on gastric B cells, facilitating the secretion of IFN-γ and the activation of which is enhanced by positive feedback regulation in B cells. These results suggest that the TLR4-TRIF-type 1 IFN-IFN-γ pathway is crucial in the development of gastric MALT lymphoma after H. suis infection and may, therefore, represent a therapeutic target for the prevention of this condition.

SUBMITTER: Yamamoto K

PROVIDER: S-EPMC8450267 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Deregulation of miRNA in Helicobacter pylori-Induced Gastric MALT Lymphoma: From Mice to Human.

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Proteomic and transcriptomic studies of BCG823 cells stimulated with Helicobacter pylori isolates from gastric MALT lymphoma

Project description:We performed both transcriptomic and proteomic analyses on gastric cancer cells infected by H. pylori isolates from GML patients and the gastric ulcer strain 26695 to investigate the differentially expressed molecular signatures that were induced by GML isolates. Transcriptomicd analysis revealed fifteen pathways, including the Wnt signaling pathway, the mTOR signaling pathway, the NOD-like receptor signaling pathway and the Hippo signaling pathway, were revealed to be related to GML isolates.

2020-04-07 | GSE148112 | GEO

Distinct methylated profiles in Helicobacter pylori dependent and independent gastric MALT lymphomas.

Project description:BACKGROUND:Gastric mucosa associated lymphoid tissue (MALT) lymphomas are clinically subdivided into Helicobacter pylori dependent and independent, according to H. pylori infection and the therapeutic course. In previous reports it has been suggested that H. pylori independent cases develop from H. pylori dependent cases, and sometimes transform into high grade diffuse large B cell lymphomas (DLBCLs). METHODS:To better understand the pathogenesis of H. pylori dependent and independent MALT lymphomas, we analysed the methylation profiles of eight independent CpG islands, including p15, p16, p73, hMLH1, death associated protein kinase, MINT1, MINT2, and MINT31 in H. pylori dependent and independent MALT lymphomas, DLBCLs, and H. pylori associated chronic gastritis. RESULTS:We first confirmed that H. pylori independent cases had a high incidence of t(11;18)(q21;q21) (4/8 cases) and aberrant BCL10 expression (7/8 cases) compared with H. pylori dependent cases and gastric DLBCLs. In the methylation pattern study, all 13 H. pylori dependent MALT lymphomas had more than four methylated loci while H. pylori independent cases had less than two. According to the previous criterion, all H. pylori dependent MALT lymphomas (13/13, 100%) and five of 10 (50%) DLBCLs were classified as CpG island methylator phenotype positive (CIMP+). In contrast, all H. pylori independent MALT lymphomas were CIMP-. CONCLUSION:The distinct methylation pattern together with lack of chromosomal translocation in H. pylori dependent MALT lymphomas suggest that H. pylori dependent and independent MALT lymphomas have a different pathogenesis.

| S-EPMC1773639 | biostudies-literature

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