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2015 ; 57
(2
): 113-20
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Repressed TGF-? signaling through CagA-Smad3 interaction as pathogenic mechanisms
of Helicobacter pylori-associated gastritis
#MMPMID26388668
Nguyen TT
; Kim SJ
; Park JM
; Hahm KB
; Lee HJ
J Clin Biochem Nutr
2015[Sep]; 57
(2
): 113-20
PMID26388668
show ga
Helicobacter pylori (H. pylori) infection causes chronic gastric inflammation,
peptic ulceration, and gastric carcinogenesis, in which H. pylori
cytotoxin-associated gene A (CagA) plays major pathogenic action. Since
transforming growth factor-? (TGF-?) and its signaling also are principally
implicated in either modulating gastric mucosal inflammatory responses or causing
carcinogenesis and are attenuated after H. pylori infection, we hypothesized that
dysregulated Smad signaling and repressed TGF-? might be core pathogenic
mechanism for H. pylori-associated gastritis or carcinogenesis. Until now, no
precise underlying mechanism how deranged TGF-? signaling developed after H.
pylori infection relevant to various clinical manifestations remains unclear. In
this study, we examined the molecular mechanism about the inhibition of TGF-?
signaling by H. pylori CagA protein. H. pylori CagA significantly suppressed
TGF-?/Smad transcriptional responses through critical inhibition of Smad3, though
CagA interacted constitutively with Smad2, Smad3, and Smad4. CagA inhibited
TGF-?-induced suppression of proinflammatory chemokines, such as IL-8, CXCL1 and
CXCL3, as well as TGF-?-induced transcription of target genes. In conclusion,
repressed TGF-? signaling associated with CagA-positive H. pylori infection could
be an important determinant for the outcome of H. pylori infection. Therefore,
TGF-? signaling is one of the important determinants to avoid from H. pylori CagA
pathogenicity.