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Role of Nrf2 dysfunction in uremia-associated intestinal inflammation and epithelial barrier disruption.

Abstract：

BACKGROUND:Gut inflammation is prevalent in chronic kidney disease (CKD) and likely contributes to systemic inflammation via disruption of the epithelial tight junction with subsequent endotoxin and bacterial translocation. AIMS:To study the expression profile of inflammatory and tight junction proteins in the colon from CKD rats compared to healthy controls, and demonstrate the role of Nrf2 (transcription factor nuclear factor erythroid 2-related factor 2) using a potent Nrf2 activator. METHODS:CKD was induced via 5/6 nephrectomy in Sprague-Dawley rats, and dh404 (2 mg/kg/day) was used to study the effects of systemic Nrf2 activation. The experimental groups included sham, CKD and CKD+ dh404 rats. Blood and colon tissues were analyzed after a 10-week study period. RESULTS:Colon from CKD rats showed histological evidence of colitis, depletion of epithelial tight junction proteins, significant reduction of Nrf2 and its measured target gene products (NQO1, catalase, and CuZn SOD), activation of NFkB, and upregulation of pro-inflammatory molecules (COX-2, MCP-1, iNOS, and gp91(phox)). Treatment with dh404 attenuated colonic inflammation, restored Nrf2 activity and levels of NQO1, catalase and CuZn SOD, decreased NFkB and lowered expression of COX-2, MCP-1, iNOS, and gp91(phox). This was associated with restoration of colonic epithelial tight junction proteins (occludin and claudin-1). CONCLUSIONS:CKD rats exhibited colitis, disruption of colonic epithelial tight junction, activation of inflammatory mediators, and impairment of Nrf2 pathway. Treatment with an Nrf2 activator restored Nrf2 activity, attenuated colonic inflammation, and restored epithelial tight junction proteins.

journal_name

Dig Dis Sci

journal_title

Digestive diseases and sciences

authors

Lau WL,Liu SM,Pahlevan S,Yuan J,Khazaeli M,Ni Z,Chan JY,Vaziri ND

doi

10.1007/s10620-014-3428-4

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

1215-22

issue

5

eissn

0163-2116

issn

1573-2568

journal_volume

60

pub_type

杂志文章

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