Oxidative stress and enhanced paracellular permeability in the small intestine of methotrexate-treated rats

被引:63
|
作者
Maeda, Tomoko [1 ]
Miyazono, Yuko [1 ]
Ito, Kousei [2 ]
Hamada, Kazuma [1 ]
Sekine, Shuichi [1 ]
Horie, Toshiharu [1 ]
机构
[1] Chiba Univ, Dept Biopharmaceut, Grad Sch Pharmaceut Sci, Chuo Ku, Chiba 2608675, Japan
[2] Univ Tokyo, Dept Pharm, Fac Med, Tokyo Univ Hosp,Bunkyo Ku, Tokyo 1138655, Japan
关键词
Methotrexate; Reactive oxygen species; Intestinal permeability; Chemiluminescence; N-Acetylcysteine; Glutathione; AGED GARLIC EXTRACT; PROSTAGLANDIN E-1; SYNTHETIC ANALOG; EPITHELIAL-CELLS; TIGHT JUNCTIONS; INDUCED DAMAGE; GROWTH-FACTOR; CHEMOTHERAPY; TOXICITY; CANCER;
D O I
10.1007/s00280-009-1119-1
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
We previously demonstrated the increase of reactive oxygen species (ROS) production and myeloperoxidase (MPO) activity in the small intestine of methotrexate (MTX)-treated rats. In the present study, we investigated the role of ROS modulating intestinal mucosal permeability in this damage. MTX (20 mg/kg body weight) was administered to rats intravenously. N-Acetylcysteine (NAC; 80 mg/kg body wt), an antioxidant and a precursor of glutathione (GSH) was administered to rats intraperitoneally to investigate the contribution of ROS to the intestinal permeability enhancement. Intestinal permeability was evaluated by determining that of a poorly absorbable marker, fluorescein isothiocyanate-labeled dextran (FD-4; average molecular mass, 4.4 kDa) using the in vitro everted intestine technique. The occurrence of oxidative stress in the small intestine was assayed by measuring chemiluminescence and thiobarbituric acid reactive substances (TBARS) productions in mucosal homogenates of the small intestine. The mucosal permeability of FD-4 significantly (p < 0.01) increased in MTX-treated rats compared with control rats, as demonstrated by a twofold increase of FD-4 permeation clearance. This suggests an increase in paracellular permeability. Interestingly, the ROS production was observed preceding the increase of paracellular permeability. Treatment with NAC prevented the MTX-induced ROS production and the increase of paracellular permeability. NAC protected the small intestine of rats from MTX-induced change in paracellular permeability, suggesting that ROS played an important role in the enhanced paracellular permeability.
引用
收藏
页码:1117 / 1123
页数:7
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