A novel paraprobiotic strain, Lentilactobacillus hilgardii H-50 enhances intestinal IgA production via TLR2-dependent IL-6 induction driven by its cell surface components

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ID: 319320
2026
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Abstract
Lactic acid bacteria enhance intestinal immunoglobulin A (IgA) secretion; however, the underlying mechanisms are often strain specific. In this study, we found a novel strain, Lentilactobacillus hilgardii H-50, that enhanced intestinal IgA production among L. hilgardii strains. Heat-killed H-50 strain increased IgA secretion from mouse Peyer's patch cells and elevated faecal IgA levels in vivo. Although this strain also induced the secretion of interleukin-6 (IL-6) and IL-10, IL-6 was essential for IgA production, whereas IL-10 less contributed to it. Cell surface components, including cell wall components and S-layer protein, but not nucleic acids, enhanced IL-6 induction and IgA production. Furthermore, H-50 exhibited TLR2 ligand activity, and blockade of TLR2 signalling abolished IL-6 induction and IgA production. These results indicate that H-50 enhances intestinal IgA production via a TLR2-dependent, IL-6-mediated mechanism. This strain can potentially be used as a paraprobiotics.
Reference Key
openalex_W7166826015 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Yoshinari Yamamoto, Rina Kanazawa, Yoshihiro Sambongi, Takuya Suzuki
Journal bioscience biotechnology and biochemistry
Year 2026
DOI
10.1093/bbb/zbag098
URL
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