Abstract
Oral administration of methotrexate (MTX) to mice causes the damage of small intestine. The permeability of poorly absorbable compound fluorescein isothiocyanate (FITC)-labeled dextran (average molecular weight, 4,400) through the small intestine was studied in vitro using everted segments of the small intestine. The permeability of FITC-dextran increased remarkably in the MTX-treated mice and oral administration of docosahexaenoic acid ethyl ester (DHA) protected the small intestine from the increase in the small intestinal permeability induced by the MTX treatment. The MTX treatment decreased retinol concentration in plasma of mice and the coadministration of DHA maintained its concentration to the level of control mice. The present study showed that DHA protected the small intestine of mice from the MTX-induced damage.
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