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The conjugate  8  was obtained as a result of condensation of 3-hydroxyiminooleanolic acid morfolide  (7)  and aspirin in dioxane. Analgesic effect of OAO-ASA  (8)  for the range of doses 0.3–300.0 mg/kg ( p.o .) was performed in mice using a  hot-plate  test. Anti-inflammatory activity was assessed on carrageenan-induced paw edema in rats for the same range of doses. The conjugate OAO-ASA  (8)  did not significantly change locomotor activity of mice, therefore sedative properties of the compound should be excluded. The compound  8  proved a simple, proportional, dose-dependent analgesic action and expressed strong anti-inflammatory activity showing a reversed U-shaped, dose-dependent relation with its maximum at 30.0 mg/kg. After its combined administration with morphine (MF, 5.0 mg/kg,  s.c .) the lowering of antinociceptive activity was found; however, the interaction with naloxone (NL, 3.0 mg/kg,  s.c .) did not affect the antinociceptive effect of OAO-ASA  (8) , therefore its opioid mechanism of action should be rather excluded. After combined administration with acetylsalicylic acid (ASA, 300.0 mg/kg,  p.o. ) in  hot-plate  test, the examined compound  8  enhanced the antinociceptive activity in significant way. It also shows that rather the whole molecule is responsible for the antinociceptive and anti-inflammatory effect of the tested compound  8 , however, it cannot be excluded that the summarizing effect is produced by ASA released from the compound  8  and the rest of triterpene derivative. The occurrence of tolerance for triterpenic derivative  8  was not observed, since the analgesic and anti-inflammatory effects after chronic administration of the conjugate OAO-ASA  (8)  was on the same level as after its single treatment. It seemed that the anti-inflammatory mechanism of action of OAO-ASA  (8)  is not simple, even its chronic administration lowered both blood concentration of IL-6 and mRNA IL-6 expression. However, the effects of the conjugate OAO-ASA  (8)  on TNF-α level and mRNA expression were opposite. Moreover, compound  8  did not change unequivocally mRNA TLR1, and TLR3 expression. Concluding, the obtained results regarding the antinociceptive and anti-inflammatory activity of new conjugate of oleanolic acid oxime and acetylsalicylic acid (OAO-ASA  8 ) are very interesting, but for explanation of its mechanism of action, more detailed studies are necessary.

Strong and Long-Lasting Antinociceptive and Anti-inflammatory Conjugate of Naturally Occurring Oleanolic Acid and Aspirin