Evaluation of antinociceptive and anti-inflammatory activity of new derivatives N-acilidrazônicos (NAH) pyrazine. / Avaliação da atividade antinociceptiva e antiinflamatória de novos derivados N-acilidrazônicos (NAH) pirazínicos.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

A new series of derivatives N-acihidrazone (NAH) pirazinic was rationally planned be applied the strategy of simplification molecular on the unit quinoxalinic of prototype LASSBio-1018, identified as a potent anti-inflammatory and analgesic in LASSBio designed by application the biososterism of rings on LASSBio-319. The new series of 21 derivatives were synthesized and subjected to experiments to determine the antinociceptive and anti-inflammatory activity. Were used mice of swiss line, of both sexes (20 to 35 g) and rats Wistar of both sexes (100-220 g). The substances were administered by p.o. (100 μmol/kg), except morphine which was administered pathway i.p. (15 μmol/kg). The indomethacin, celecoxib, thalidomide and morphine were used as standart drugs. For evaluation antinociceptive were performed the constriction abdominal assay, hyperalgesia induced-formalin and hot plate test. The anti-inflammatory action were investigated by the assay capsaicin-induced ear edema, peritonitis zymosan A-induced and assay of induction of syndrome arthritis experimental. On the constriction abdominal assay all compounds inhibited the constriction significantly standing out the prototypes LASSBio-1181 e LASSBio-1188 (97% and 86%) (p <0,01), respectively. On the formalin assay the LASSBio-1186 was able to significantly modulate the antinociceptive response in the neurogenic phase (average latency of 12 s). In first phase thirteen prototypes inhibited the inflammatory response and the LASSBio-1181 LASSBio-1256 and the most active time. On the Capsaicin-induced ear edema of six prototypes showed statistically significant inhibition, highlighting the LASSBio- 1181 (69%) and LASSBio-1182 (63%) among the most active. On the assay of zymosan Ainduced peritonitis of the LASSBio-1180 inhibition of 56.95% of the response. On the assay of arthritis the LASSBio-1181 and thalidomide were capable reduce of swelling in the paw several days of treatment. On the hot plate test of any of the prototypes was active. Considering these data we can conclude that the prototypes were able to modulate the antinociceptive response in both models of nociception (formalin and constriction abdominal), demonstrating a great potential antinociceptive and that may not involve core components, is seen, all the derivatives present no inhibition in hot plate test. The second phase of the formalin model were identified several prototypes with anti-inflammatory action that can be confirmed by testing of ear edema. These results infer that the prototypes are capable of modulating the response peripheral antinociceptive and anti-inflammatory.

ASSUNTO(S)

activity anti-inflammatory n-acihidrazone pirazinic ciencias da saude activity antinociceptive atividade antiinflamatória atividade antinociceptiva n-acilidrazônicos (nah) pirazínicos

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