Antinociceptive effect of Lonchocarpus araripensis lectin: activation of l-arginine/NO/cGMP/K+ATP signaling pathway


Objective and design

The involvement of nitric oxide pathway in the antinociceptive activity of Lonchocarpus araripensis lectin (LAL) was investigated in the model of carragenan-induced hypernociception.


Swiss mice received LAL (0.01–10 mg/kg; i.v.) 30 min before s.c. injection of carragenan in the paws. For the involvement of nociceptive pathways, animals were previously treated with the blockers: NOS (L-NAME, aminoguanidine, 7-nitroindazole); soluble guanylyl cyclase (ODQ); channels of ATP-dependent K+ (glibenclamide); L-type Ca2+ (nifedipine), or Ca2+-dependent Cl (niflumic acid). Participation of lectin domain was evaluated by injection of LAL associated with N-acetyl-glucosamine (GlcNAc). nNOS gene relative expression was evaluated in the paw tissues and nNOS immunostaining in dorsal root ganglia.


LAL at all doses inhibited carrageenan-induced hypernociception (4.12 ± 0.58 g), being maximal at 10 mg/kg (3 h: 59%), and reversed by GlcNAc. At this time, LAL effect was reversed by nifedipine (39%), niflumic acid (59%), L-NAME (59%), 7-nitroindazole (44%), ODQ (45%), and glibenclamide (34%), but was unaltered by aminoguanidine. LAL increased (95%) nNOS gene expression in mice paw tissues, but not its immunoexpression in the dorsal root ganglia.


The antinociceptive effect of Lonchocarpus araripensis lectin involves activation of the l-arginine/NO/GMPc/K+ATP pathway.

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The authors thank Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq, Fundação Cearense de Amparo a Pesquisa-FUNCAP and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-CAPES. Cavada BS and Assreuy AM are senior investigators of CNPq.

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Correspondence to Ana Maria S. Assreuy.

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Assreuy, A.M.S., Amorim, R.M.F., Martins, S.L. et al. Antinociceptive effect of Lonchocarpus araripensis lectin: activation of l-arginine/NO/cGMP/K+ATP signaling pathway. Inflammopharmacol (2020).

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  • Dalbergieae lectin
  • Hypernociception
  • nNOS
  • Nitric oxide