Antinociceptive and anti-inflammatory effects of 4-(arylchalcogenyl)-1H-pyrazoles containing selenium or sulfur

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4-(Arylchalcogenyl)-1H-pyrazoles containing selenium or sulfur (0.001–50 mg/kg) were investigated regarding the intragastric route effect (ig) administration on nociception in mice. In this study, nociception and inflammation were induced by chemical agents such as formalin (0.92%), sodium l-glutamate 1-hydrate (20 μmol), croton oil (2.5%), acetic acid (1.6%) and thermic model with a hot plate test.


Compounds 1ac had the ability to reduce licking time in both phases (neurogenic and inflammatory) of the formalin test and glutamate. Only compounds 1a and 1b had the ability to reduce the number of abdominal writhes caused by acetic acid. The same was observed with the positive control celecoxib. To evaluate the possible anti-inflammatory activity of compounds 1a–c, the induction of paw edema by formalin and ear edema by croton oil was performed. For the inflammation induced by formalin, significant effects were observed from the dose of 0.1 mg/kg (1a–b) and 10 mg/kg (1c). In the ear edema test, it can be observed that only compound 1a had a significant effect. In the hotplate test, all the compounds had the ability to reduce the latency time.


The results demonstrated that acute antinociceptive and anti-inflammatory effects of 4-(arylchalcogenyl)-1H-pyrazoles 1a is better than compared with the compound 1b and 1c in mice. This resulted in these molecules attracting the interest of researchers to perform future studies to develop new drugs to treat pain and inflammatory clinical conditions.

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This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001, FAPERGS (PRONEM 16/2551-0000240-1 and PqG 17/2551-00011046-9) and CNPq. CNPq is also acknowledged for the fellowship to D.A, R.J. and L.S. is recipients.

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Correspondence to Lucielli Savegnago.

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Oliveira, D.H., Sousa, F.S.S., Birmann, P.T. et al. Antinociceptive and anti-inflammatory effects of 4-(arylchalcogenyl)-1H-pyrazoles containing selenium or sulfur. Pharmacol. Rep (2020).

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  • Antinociceptive
  • Anti-inflammatory
  • Organochalcogens
  • Pyrazole