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Innate mechanism of mucosal barrier erosion in the pathogenesis of acquired colitis.


ABSTRACT: The colonic mucosal barrier protects against infection, inflammation, and tissue ulceration. Composed primarily of Mucin-2, proteolytic erosion of this barrier is an invariant feature of colitis; however, the molecular mechanisms are not well understood. We have applied a recurrent food poisoning model of acquired inflammatory bowel disease using Salmonella enterica Typhimurium to investigate mucosal barrier erosion. Our findings reveal an innate Toll-like receptor 4-dependent mechanism activated by previous infection that induces Neu3 neuraminidase among colonic epithelial cells concurrent with increased Cathepsin-G protease secretion by Paneth cells. These anatomically separated host responses merge with the desialylation of nascent colonic Mucin-2 by Neu3 rendering the mucosal barrier susceptible to increased proteolytic breakdown by Cathepsin-G. Depletion of Cathepsin-G or Neu3 function using pharmacological inhibitors or genetic-null alleles protected against Mucin-2 proteolysis and barrier erosion and reduced the frequency and severity of colitis, revealing approaches to preserve and potentially restore the mucosal barrier.

SUBMITTER: Yang WH 

PROVIDER: S-EPMC10518488 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature

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Innate mechanism of mucosal barrier erosion in the pathogenesis of acquired colitis.

Yang Won Ho WH   Aziz Peter V PV   Heithoff Douglas M DM   Kim Yeolhoe Y   Ko Jeong Yeon JY   Cho Jin Won JW   Mahan Michael J MJ   Sperandio Markus M   Marth Jamey D JD  

iScience 20230909 10


The colonic mucosal barrier protects against infection, inflammation, and tissue ulceration. Composed primarily of Mucin-2, proteolytic erosion of this barrier is an invariant feature of colitis; however, the molecular mechanisms are not well understood. We have applied a recurrent food poisoning model of acquired inflammatory bowel disease using <i>Salmonella enterica</i> Typhimurium to investigate mucosal barrier erosion. Our findings reveal an innate Toll-like receptor 4-dependent mechanism a  ...[more]

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