We evaluated the effects of a casein hydrolysate (CH) prepared from Aspergillus oryzae protease on rat adjuvant arthritis, a model of human rheumatoid arthritis. CH was administered orally once a day to the animals for 22 d after the adjuvant injection. CH suppressed swelling in the adjuvant-uninjected hind paws, and a higher dose of CH suppressed the increase in arthritic score and swelling of the adjuvant-injected hind paws. A histopathological examination revealed evidence that the higher dose of CH suppressed the articular changes in the rats. In addition, CH suppressed the production of nitric oxide and prostaglandin E(2) in the plasma of the rats. These results suggest that CH had a suppressive effect on adjuvant arthritis by inhibiting the acute and chronic inflammatory reactions.
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HATORI et al. (2008) studied this question.
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