Diosmin reduces chronic constriction injury-induced neuropathic pain in mice

Autor(es)

Bertozzi, Mariana M. ; Rossaneis, Ana C. ; Fattori, Victor ; Longhi-Balbinot, Daniela T. ; Freitas, Andressa ; Cunha, Fernando Q. ; Alves-Filho, Jose C. ; Cunha, Thiago M. ; Casagrande, Rubia ; Verri, Jr., Waldiceu A.

• Tipo de documento: Artigo Científico
• Fonte: Chemico-Biological Interactions; v. 273, p. 180-189, AUG 1 2017.
• Citações Web of Science: 8

Resumo

Injury or dysfunction of somatosensory system induces a complex syndrome called neuropathic pain, which still needs adequate pharmacological control. The current pharmacological treatments were in part developed from natural compounds. Flavonoids are natural polyphenolic molecules presenting varied biological activities and low toxicity. The flavonoid diosmin is a safe compound with good tolerability and low toxicity. This study evaluated the antinociceptive effect of diosmin in the sciatic nerve chronic constriction injury (CCI)-induced neuropathic pain model. Male Swiss mice were submitted to CCI and 7 days after, diosmin at 1 or 10 mg/kg was administrated intraperitoneally. Mechanical (electronic analgesimeter) and thermal (hot plate) hyperalgesia were evaluated 1-24 h after treatment. The role of the NO/cGMP/PKG/KATP channel signaling pathway in the analgesic effect of diosmin was evaluated using the pretreatment with L-NAME (an inhibitor of NOS), ODQ (an inhibitor of soluble guanylate cyclase), KT5823 (an inhibitor of PKG), or glibenclamide (an ATP-sensitive K+ channels blocker). Single treatment with diosmin inhibited in a dose-dependent manner CCI-induced mechanical and thermal hyperalgesia by activating the NO/cGMP/PKG/KATP channel signaling pathway and inhibiting spinal cord cytokine (Il-1 beta and Il-33/St2) and glial cells activation (microglia-Iba-1, oligodendrocytes - Olig2) mRNA expression markers. Daily treatment during 7 days with diosmin inhibited CCI-induced mechanical and thermal hyperalgesia by inhibiting spinal cord cytokine (Il-1 beta, Tnf alpha, and Il-33/St2) and glial cells activation (astrocytes - Gfap, Iba-1, and Olig2) markers mRNA expression. In conclusion, diosmin inhibits neuropathic spinal cord nociceptive mechanisms suggesting this flavonoid as a potential therapeutic molecule to reduce nerve lesion-induced neuropathic pain. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/08216-2 - CPDI - Centro de Pesquisa em Doenças Inflamatórias
• Beneficiário: Fernando de Queiroz Cunha
• Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 11/19670-0 - Mecanismos envolvidos na fisiopatologia da artrite reumatóide, dor e sepse
• Beneficiário: Fernando de Queiroz Cunha
• Linha de fomento: Auxílio à Pesquisa - Temático