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2015 ; 2015
(ä): 986075
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Elevation of HO-1 Expression Mitigates Intestinal Ischemia-Reperfusion Injury and
Restores Tight Junction Function in a Rat Liver Transplantation Model
#MMPMID26064429
Chi X
; Yao W
; Xia H
; Jin Y
; Li X
; Cai J
; Hei Z
Oxid Med Cell Longev
2015[]; 2015
(ä): 986075
PMID26064429
show ga
Aims. This study was aimed at investigating whether elevation of heme oxygenase-1
(HO-1) expression could lead to restoring intestinal tight junction (TJ) function
in a rat liver transplantation model. Methods. Intestinal mucosa injury was
induced by orthotopic autologous liver transplantation (OALT) on male
Sprague-Dawley rats. Hemin (a potent HO-1 activator) and zinc-protoporphyrin
(ZnPP, a HO-1 competitive inhibitor), were separately administered in selected
groups before OALT. The serum and intestinal mucosa samples were collected at 8
hours after the operation for analysis. Results. Hemin pretreatment significantly
reduced the inflammation and oxidative stress in the mucosal tissue after OALT by
elevating HO-1 protein expression, while ZnPP pretreatment aggravated the OALT
mucosa injury. Meanwhile, the restriction on the expression of tight junction
proteins zonula occludens-1 and occludin was removed after hemin pretreatment.
These molecular events led to significant improvement on intestinal barrier
function, which was proved to be through increasing nuclear translocation of
nuclear factor-E2-related factor 2 (Nrf2) and reducing nuclear translocation of
nuclear factor kappa-B (NF-?B) in intestinal injured mucosa. Summary. Our study
demonstrated that elevation of HO-1 expression reduced the OALT-induced
intestinal mucosa injury and TJ dysfunction. The HO-1 protective function was
likely mediated through its effects of anti-inflammation and antioxidative
stress.