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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 Gastroenterol+Res+Pract
2018 ; 2018
(ä): 9050715
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Activation of Signal Transduction and Activator of Transcription 3 Signaling
Contributes to Helicobacter-Associated Gastric Epithelial Proliferation and
Inflammation
#MMPMID29849601
Ishii Y
; Shibata W
; Sugimori M
; Kaneta Y
; Kanno M
; Sato T
; Sue S
; Kameta E
; Kaneko H
; Irie K
; Sasaki T
; Kondo M
; Maeda S
Gastroenterol Res Pract
2018[]; 2018
(ä): 9050715
PMID29849601
show ga
BACKGROUND/AIM: Although IL-6-mediated activation of the signal transduction and
activator of transcription 3 (STAT3) axis is involved in inflammation and cancer,
the role of STAT3 in Helicobacter-associated gastric inflammation and
carcinogenesis is unclear. This study investigated the role of STAT3 in gastric
inflammation and carcinogenesis and examined the molecular mechanism of
Helicobacter-induced gastric phenotypes. METHODS: To evaluate the contribution of
STAT3 to gastric inflammation and carcinogenesis, we used wild-type (WT) and
gastric epithelial conditional Stat3-knockout (Stat3(?gec) ) mice. Mice were
infected with Helicobacter felis and euthanized at 18 months postinfection. Mouse
gastric organoids were treated with recombinant IL-6 (rIL-6) or rIL-11 and a JAK
inhibitor (JAKi) to assess the role of IL-6/STAT3 signaling in vitro. RESULTS:
Inflammation and mucous metaplasia were more severe in WT mice than in
Stat3(?gec) mice. The epithelial cell proliferation rate and STAT3 activation
were increased in WT mice. Application of rIL-6 and rIL-11 induced expression of
intestinal metaplasia-associated genes, such as Tff2; this induction was
suppressed by JAKi administration. CONCLUSIONS: Loss of STAT3 signaling in the
gastric mucosa leads to decreased epithelial cell proliferation, atrophy, and
metaplasia in the setting of Helicobacter infection. Therefore, activation of
STAT3 signaling may play a key role in Helicobacter-associated gastric
carcinogenesis.