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2017 ; 8
(ä): 1131
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Chromofungin Ameliorates the Progression of Colitis by Regulating Alternatively
Activated Macrophages
#MMPMID28951733
Eissa N
; Hussein H
; Kermarrec L
; Grover J
; Metz-Boutigue ME
; Bernstein CN
; Ghia JE
Front Immunol
2017[]; 8
(ä): 1131
PMID28951733
show ga
Ulcerative colitis (UC) is characterized by a functional dysregulation of
alternatively activated macrophage (AAM) and intestinal epithelial cells (IECs)
homeostasis. Chromogranin-A (CHGA) secreted by neuroendocrine cells is implicated
in intestinal inflammation and immune dysregulation. CHGA undergoes proteolytic
processing to generate CHGA-derived peptides. Chromofungin (CHR: CHGA(47-66)) is
a short CHGA-derived peptide encoded by CHGA Exon-IV and is involved in innate
immune regulation, but the basis is poorly investigated. We investigated the
expression of CHR in colonic tissue of patients with active UC and assessed the
effects of the CHR in dextran sulfate sodium (DSS) colitis in mice and on
macrophages and human colonic epithelial cells. We found that mRNA expression of
CHR correlated positively with mRNA levels of AAM markers and gene expression of
tight junction (TJ) proteins and negatively with mRNA levels of interleukin
(IL)-8, IL-18, and collagen in patients with active UC. Moreover, AAM markers
correlated positively with gene expression of TJ proteins and negatively with
IL-8, IL-18, and collagen gene expression. Experimentally, intracolonic
administration of CHR protected against DSS-induced colitis by priming
macrophages into AAM, reducing colonic collagen deposition, and maintaining IECs
homeostasis. This effect was associated with a significant increase of AAM
markers, reduction of colonic IL-18 release and conservation of gene expression
of TJ proteins. In vitro, CHR enhanced AAM polarization and increased the
production of anti-inflammatory mediators. CHR-treated AAM conditioned medium
increased Caco-2 cell migration, viability, proliferation, and mRNA levels of TJ
proteins, and decreased oxidative stress-induced apoptosis and proinflammatory
cytokines release. Direct CHR treatments had the same effect. In conclusion, CHR
treatment reduces the severity of colitis and the inflammatory process via
enhancing AAM functions and maintaining IECs homeostasis. CHR is involved in the
pathogenesis of inflammation in experimental colitis. These findings provide
insight into the mechanisms of colonic inflammation and could lead to new
therapeutic strategies for UC.