ABSTRACT
Rats with adjuvant arthritis (AA rats) show obvious inhibition of the local inflammation when steroids (DXM) are administered. But the contraction of thymic or adrenal atrophy, spleen hypertrophy, and reduction of activity of serum dipeptidyl aminopeptidase IV are recognized. In rats where Sokei-kakketsu-to or Yokuinin-to was administered, prominent anti-inflammatory effects like dexamethasone were not found; however the contraction of thymic or adrenal atrophy, spleen hypertrophy, and reduction of activity of serum dipeptidyl aminopeptidase IV was not recognized. In addition, after withdrawal of drugs, rebound in regional joints did not occurr as with steroids, and the reducing effect for arthrocele was prolonged. Therefore, it was concluded that those two formulations have an effect on the immune system —with anti-inflammatory effects for AA rats— and these action mechanisms are different from that of steroids (DXM).