ANTINOCICEPTIVE AND ANTI-INFLAMMATORY ACTIVITIES OF THE AQUEOUS EXTRACT OF MIKANIA LINDLEYANA IN RODENTS

Mikania lindleyana is a plant widely distributed in Brazilian Amazonia, popularly known as “sucuriju” and largely used in folk medicine to treat inflammation, chronic ulcers and pain. In the present study, we identified the secondary metabolites of the aqueous extract of M. lindleyana (AEML) and investigate its effects on several models of inflammation and nociception in rodents. Phytochemical screening of the AEML showed the presence of saponins, proteins, amino acids, phenols, tannins, organic acids and flavonoids. Oral pretreatment of mice with AEML significantly (P < 0.05) reduced the abdominal constrictions evoked by acetic acid injection and the licking time in both first and second phases in the formalin test but has no significant effect on hot plate test. In rats, AEML inhibited the edema formation induced by carrageenan and croton oil while has no significant effects on the edema induced by dextran. AEML inhibited the carrageenaninduced neutrophil migration as well as the rolling and the adhesion of leukocytes. The present study shows for the first time that AEML displays antinociceptive and anti-inflammatory activities which could be attributed respectively to a possible opioid mechanism and to an inhibition of the adhesion molecules by interference on pro-inflammatory cytokines. These results support the widespread use of M. lindleyana in popular medicine to treat inflammation and pain.