Proconvulsant effects of sildenafil citrate on pilocarpine-induced seizures: Involvement of cholinergic, nitrergic and pro-oxidant mechanisms
| Autor: | Michele Albuquerque Jales de Carvalho, Klistenes Alves de Lima, Emiliano Ricardo Rios Vasconcelos, Marta Maria de França Fonteles, Francisca Cléa Florenço de Souza, João Victor Souza Oliveira, Danielle Silveira Macêdo, Mariana Lima Feitosa, Denia Alves Albuquerque de Souza, Camila Nayane de Carvalho Lima, Alana Gomes de Souza, Adriano José Maia Chaves-Filho |
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| Rok vydání: | 2019 |
| Předmět: |
Male
0301 basic medicine medicine.drug_mechanism_of_action Sildenafil Nitric Oxide Synthase Type II Pharmacology Nitric Oxide Hippocampus Sildenafil Citrate Nitric oxide Mice 03 medical and health sciences chemistry.chemical_compound Epilepsy 0302 clinical medicine Seizures Muscarinic acetylcholine receptor medicine Animals Cyclic GMP Seizure threshold business.industry General Neuroscience Pilocarpine Phosphodiesterase 5 Inhibitors medicine.disease respiratory tract diseases 030104 developmental biology chemistry Acetylcholinesterase cardiovascular system Cholinergic Reactive Oxygen Species business Phosphodiesterase 5 inhibitor 030217 neurology & neurosurgery medicine.drug |
| Zdroj: | Brain Research Bulletin. 149:60-74 |
| ISSN: | 0361-9230 |
| DOI: | 10.1016/j.brainresbull.2019.04.008 |
| Popis: | Sildenafil is a phosphodiesterase 5 inhibitor used for the treatment of erectile dysfunction and pulmonary hypertension. Proconvulsant effect is a serious adverse event associated with sildenafil use. Here, we investigated the possible proconvulsant effects of sildenafil in pilocarpine (PILO)-induced seizures model, which mimics some aspects of temporal lobe epilepsy. We also evaluated sildenafil’s effects on hippocampal markers related to PILO-induced seizure, for instance, acetylcholinesterase (AChE) activity, oxidative stress and nitric oxide (NO) markers, namely nitrite, inducible NO synthase (iNOS) and neuronal NOS (nNOS). The influences of muscarinic receptors blockade on sildenafil proconvulsant effects and brain nitrite levels were also evaluated. Male mice were submitted to single or repeated (7 days) sildenafil administration (2.5, 5, 10 and 20 mg/kg). Thirty minutes later, PILO was injected and mice were further evaluated for 1 h for seizure activity. Sildenafil induced a dose- and time-progressive proconvulsant effect in PILO-induced seizures. Sildenafil also potentiated the inhibitory effect of PILO in AChE activity and induced a further increase in nitrite levels and pro-oxidative markers, mainly in the hippocampus. Repeated sildenafil treatment also increased the hippocampal expression of iNOS and nNOS isoforms, while the blockade of muscarinic receptors attenuated both sildenafil-induced proconvulsant effect and brain nitrite changes. Our data firstly demonstrated the proconvulsant effect of sildenafil in PILO-model of seizures. This effect seems to be related to an increased cholinergic-nitrergic tone and pro-oxidative brain changes. Also, our findings advert to caution in using sildenafil for patients suffering from neurological conditions that reduces seizure threshold, such as epilepsy. |
| Databáze: | OpenAIRE |
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