Nitric oxide-mediated intestinal injury is required for alcohol-induced gut leakiness and liver damage.
Nitric oxide-mediated intestinal injury is required for alcohol-induced gut leakiness and liver damage.
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DOI：
10.1111/j.1530-0277.2009.00946.x
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发表时间：
2009-07
期刊：
影响因子：
--
通讯作者：
Keshavarzian A
中科院分区：
文献类型：
--
作者：
Tang Y;Forsyth CB;Farhadi A;Rangan J;Jakate S;Shaikh M;Banan A;Fields JZ;Keshavarzian A
Alcoholic liver disease (ALD) requires endotoxemia and is commonly associated with intestinal barrier leakiness. Using monolayers of intestinal epithelial cells as an in vitro barrier model, we showed that ethanol-induced intestinal barrier disruption is mediated by iNOS (inducible nitric-oxide synthase) upregulation, NO (nitric oxide) overproduction, and oxidation/nitration of cytoskeletal proteins. We hypothesized that iNOS inhibitors (L-NAME, L-NIL) in vivo will inhibit the above cascade and liver injury in an animal model of alcoholic steatohepatitis (ASH). Male Sprague-Dawley rats were gavaged daily with alcohol (6 g/kg/day) or dextrose for 10 weeks ± L-NAME, L-NIL or vehicle. Systemic and intestinal NO levels were measured by nitrites and nitrates in urine and tissue samples, oxidative damage to the intestinal mucosa by protein carbonyl and nitrotyrosine, intestinal permeability by urinary sugar tests, and liver injury by histological inflammation scores, liver fat, and myeloperoxidase activity. Alcohol caused tissue oxidation, gut leakiness, endotoxemia and ASH. L-NIL and L-NAME, but not the D-enantiomers, attenuated all steps in the alcohol-induced cascade including NO overproduction, oxidative tissue damage, gut leakiness, endotoxemia, hepatic inflammation and liver injury. The mechanism we reported for alcohol-induced intestinal barrier disruption in vitro – NO overproduction, oxidative tissue damage, leaky gut, endotoxemia and liver injury – appears to be relevant in vivo in an animal model of alcohol-induced liver injury. That iNOS inhibitors attenuated all steps of this cascade suggests that prevention of this cascade in alcoholics will protect the liver against the injurious effects of chronic alcohol and that iNOS may be a useful target for prevention of ALD.
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影响因子：
13.5
作者：
Aram, Ghazaleh;Potter, James J.;Mezey, Esteban
通讯作者：
Mezey, Esteban
影响因子：
5.5
作者：
Banan, A;Zhang, LJ;Keshavarzian, A
通讯作者：
Keshavarzian, A
影响因子：
2.3
作者：
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通讯作者：
MCDONOUGH, K
DOI：
10.1111/j.1365-2362.1996.tb02131.x
发表时间：
1996-10-01
影响因子：
5.5
作者：
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通讯作者：
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DOI：
10.1152/ajpgi.2001.280.6.g1234
发表时间：
2001-06-01
影响因子：
4.5
作者：
Banan, A;Fields, JZ;Keshavarzian, A
通讯作者：
Keshavarzian, A