Myeloid differentiation primary response gene (MyD) 88 signalling is not essential for intestinal fibrosis development

Sci Rep. 2017 Dec 15;7(1):17678. doi: 10.1038/s41598-017-17755-7.

Abstract

Dysregulation of the immune response to microbiota is associated with inflammatory bowel disease (IBD), which can trigger intestinal fibrosis. MyD88 is a key component of microbiota signalling but its influence on intestinal fibrosis has not been clarified. Small bowel resections from donor-mice were transplanted subcutaneously into the neck of recipients C57BL/6 B6-MyD88tm1 Aki (MyD88-/-) and C57BL/6-Tg(UBC-green fluorescence protein (GFP))30Scha/J (GFP-Tg). Grafts were explanted up to 21 days after transplantation. Collagen layer thickness was determined using Sirius Red stained slides. In the mouse model of fibrosis collagen deposition and transforming growth factor-beta 1 (TGF-β1) expression was equal in MyD88+/+ and MyD88-/-, indicating that MyD88 was not essential for fibrogenesis. Matrix metalloproteinase (Mmp)9 expression was significantly decreased in grafts transplanted into MyD88-/- recipients compared to MyD88+/+ recipients (0.2 ± 0.1 vs. 153.0 ± 23.1, respectively, p < 0.05), similarly recruitment of neutrophils was significantly reduced (16.3 ± 4.5 vs. 25.4 ± 3.1, respectively, p < 0.05). Development of intestinal fibrosis appears to be independent of MyD88 signalling indicating a minor role of bacterial wall compounds in the process which is in contrast to published concepts and theories. Development of fibrosis appears to be uncoupled from acute inflammation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Collagen / metabolism
  • Disease Models, Animal
  • Fibrosis / metabolism*
  • Fibrosis / pathology
  • Inflammation / metabolism
  • Inflammation / pathology
  • Intestinal Mucosa / metabolism*
  • Intestines / pathology
  • Matrix Metalloproteinase 9 / metabolism
  • Mice
  • Mice, Inbred C57BL
  • Myeloid Differentiation Factor 88 / metabolism*
  • Neutrophils / metabolism
  • Neutrophils / pathology
  • Signal Transduction / physiology*
  • Transforming Growth Factor beta1 / metabolism

Substances

  • Myd88 protein, mouse
  • Myeloid Differentiation Factor 88
  • Transforming Growth Factor beta1
  • Collagen
  • Matrix Metalloproteinase 9