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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(39
): 26847-26858
Nephropedia Template TP
Zhang L
; Zhang Y
; Zhong W
; Di C
; Lin X
; Xia Z
J Biol Chem
2014[Sep]; 289
(39
): 26847-26858
PMID25112868
show ga
Inflammatory bowel disease (IBD), including ulcerative colitis and Crohn's
disease, is a group of autoimmune diseases characterized by nonspecific
inflammation in the gastrointestinal tract. Recent investigations suggest that
activation of Th17 cells and/or deficiency of regulatory T cells (Treg) is
involved in the pathogenesis of IBD. Heme oxygenase (HO)-1 is a protein with a
wide range of anti-inflammatory and immune regulatory function, which exerts
significantly protective roles in various T cell-mediated diseases. In this
study, we aim to explore the immunological regulation of HO-1 in the dextran
sulfate sodium-induced model of experimental murine colitis. BALB/c mice were
administered 4% dextran sulfate sodium orally; some mice were intraperitoneally
pretreated with HO-1 inducer hemin or HO-1 inhibitor stannum protoporphyrin IX.
The results show that hemin enhances the colonic expression of HO-1 and
significantly ameliorates the symptoms of colitis with improved histological
changes, accompanied by a decreased proportion of Th17 cells and increased number
of Tregs in mesenteric lymph node and spleen. Moreover, induction of HO-1
down-regulates retinoic acid-related orphan receptor ?t expression and IL-17A
levels, while promoting Treg-related forkhead box p3 (Foxp3) expression and IL-10
levels in colon. Further study in vitro revealed that up-regulated HO-1 switched
the naive T cells to Tregs when cultured under a Th17-inducing environment, which
involved in IL-6R blockade. Therefore, HO-1 may exhibit anti-inflammatory
activity in the murine model of acute experimental colitis via regulating the
balance between Th17 and Treg cells, thus providing a possible novel therapeutic
target in IBD.