Side-stream smoking reduces intestinal inflammation and increases expression of tight junction proteins.

Abstract:

AIM:To investigate the effect of side-stream smoking on gut microflora composition, intestinal inflammation and expression of tight junction proteins. METHODS:C57BL/6 mice were exposed to side-stream cigarette smoking for one hour daily over eight weeks. Cecal contents were collected for microbial composition analysis. Large intestine was collected for immunoblotting and quantitative reverse transcriptase polymerase chain reaction analyses of the inflammatory pathway and tight junction proteins. RESULTS:Side-stream smoking induced significant changes in the gut microbiota with increased mouse intestinal bacteria, Clostridium but decreased Fermicutes (Lactoccoci and Ruminococcus), Enterobacteriaceae family and Segmented filamentous baceteria compared to the control mice. Meanwhile, side-stream smoking inhibited the nuclear factor-κB pathway with reduced phosphorylation of p65 and IκBα, accompanied with unchanged mRNA expression of tumor necrosis factor-α or interleukin-6. The contents of tight junction proteins, claudin3 and ZO2 were up-regulated in the large intestine of mice exposed side-stream smoking. In addition, side-stream smoking increased c-Jun N-terminal kinase and p38 MAPK kinase signaling, while inhibiting AMP-activated protein kinase in the large intestine. CONCLUSION:Side-stream smoking altered gut microflora composition and reduced the inflammatory response, which was associated with increased expression of tight junction proteins.

journal_name

World J Gastroenterol

authors

Wang H,Zhao JX,Hu N,Ren J,Du M,Zhu MJ

doi

10.3748/wjg.v18.i18.2180

subject

Has Abstract

pub_date

2012-05-14 00:00:00

pages

2180-7

issue

18

eissn

1007-9327

issn

2219-2840

journal_volume

18

pub_type

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