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In rats with adjuvant-induced arthritis, the effect of (+)-catechin (CA) and 0-(beta-hydroxyethyl) rutosides (HR) on the crosslinking of collagen was studied. Compared with controls the arthritic group showed an increase in the reversibility of neutral salt-soluble collagen gel, solubility of acid-insoluble collagen to denaturing agents and the ratio of alpha/beta subunits of neutral salt-soluble collagen. These results suggest an impaired maturation of collagen in arthritic animals. Administration of CA or HR to the arthritic animals caused a decrease in the reversibility of collagen gel and in the solubility of acid-insoluble collagen to denaturing agents and to pronase. In addition, the electrophoretic patterns of neutral salt-soluble collagen on SDS polyacrylamide gels also showed a decrease in the alpha/beta ratio. All these results may collectively indicate that both flavonoids promote the crosslinking of collagen in arthritic animals.
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Rao et al. (1983) studied this question.
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