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AbstractBackground and aimsCholinergic agents cause antinociception by mimicking the release of acetylcholine (ACh) from spinal cholinergic nerves. PhKv is a peptide isolated from the venom of the armed spider Phoneutria nigriventer. It has an antiarrythmogenic activity that involves the enhanced release of acetylcholine. The aim of this study was to investigate whether PhKv had an antinociceptive action in mice.MethodsMale albino Swiss mice (25–35 g) were used in this study. The PhKv toxin was purified from a PhTx3 fraction of the Phoneutria nigriventer spider’s venom. Because of its peptide nature, PhKv is not orally available and it was delivered directly into the central nervous system by an intrathecal (i.t.) route. PhKV on the thermal and mechanical sensitivity was evaluated using plantar test apparatus and the up-and-down method. The analgesic effects of PhKv were studied in neuropathic pain (CCI) and in the peripheral capsicin test. In order to test whether PhKv interfered with the cholinergic system, the mice were pre-treated with atropine (5mg/kg, i.p.) or mecamylamine (0.001 mg/kg, i.p.) and the PhKv toxin (30 pmol/site i.t.) or neostigmine (100 pmol/site) were applied 15 min before the intraplantar capsaicin (1 nmol/paw) administrations. To investigate PhKv action on the AChE activities, was performed in vitro and ex vivo assay for AChE. For the in vitro experiments, mice spinal cord supernatants of tissue homogenates (1 mg/ml) were used as source of AChE activity. The AChE assay was monitored at 37 °C for 10 min in a FlexStation 3 Multi-Mode Microplate Reader (Molecular Devices) at 405 nm.ResultsPhKv (30 and 100pmol/site, i.t.) had no effect on the thermal or mechanical sensitivity thresholds. However, in a chronic constriction injury model of pain, PhKv (10pmol/site, i.t.) caused a robust reduction in mechanical withdrawal with an antinociceptive effect that lasted 4 h. A pretreatment in mice with PhKv (30pmol/site, i.t.) or neostigmine (100pmol/site, i.t.) 15min before an intraplantar injection of capsaicin (1 nmol/paw) caused a maximal antinociceptive effect of 69.5 ± 4.9% and 85 ± 2.5%, respectively. A pretreatment in mice with atropine; 5 mg/kg, i.p. or mecamylamine 0.001 mg/kg, i.p. inhibited a neostigimine and PhKv-induced antinociception, suggesting a cholinergic mechanism. Spinal acetylcholinesterase was inhibited by PhKv with ED50 of 7.6 (4.6–12.6 pmol/site, i.t.). PhKv also inhibited the in vitro AChE activity of spinal cord homogenates with an EC50 of 20.8 (11.6–37.3 nM), shifting the Km value from 0.06 mM to 18.5 mM, characterizing a competitive inhibition of AChE activity by PhKv.ConclusionsOur findings provide, to our knowledge, the first evidence that PhKv caused inhibition of AChE, it increased the ACh content at the neuronal synapses, leading to an activation of the cholinergic system and an antinociceptive response.ImplicationsStudies regarding the nociceptive mechanisms and the identification of potential targets for the treatment of pain have become top priorities. PhKv, by its action of stimulating the cholinergic receptors muscarinic and nicotinic system, reduces pain it may be an alternative for controlling the pain processes.
Scandinavian Journal of Pain – de Gruyter
Published: Oct 1, 2017
Keywords: PhKv; Pain; Antinociception; Muscarinic receptors; Nicotinic receptors; Acetylcholinesterase
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