Journals / Gülhane Tıp Dergisi / 2016 / Cilt: 58 - Sayı: 3

The Effects of Methylene Blue and Tadalafil in Pentylenetetrazole Induced Convulsion Model

Pentilentetrazol ile oluşturulan konvülziyon modelinde metilen mavisi ve tadalafilin etkileri

Pages
286–290
DOI
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Spike wave discharges were decreased in 5 and 10 mg/kg MB groups and increased in 10 mg/kg tadalafil group when compared with saline group.The proconvulsant properties of all the agents may be taken into consideration, especially when prescribing PDE5 inhibitors

📌 3 Key Takeaways

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Objective & Hypothesis:L-arginine (L-ARG)-nitric oxide (NO)-cGMP (cyclic guanosine monophosphate) cycle has been determined in various studies to be associated with epilepsy.
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Key Findings & Data:Tadalafil is a potent inhibitor of phosphodiesterase 5 (PDE5) and increases the level of cGMP.
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Conclusion & Impact:Spike wave discharges were decreased in 5 and 10 mg/kg MB groups and increased in 10 mg/kg tadalafil group when compared with saline group.The proconvulsant properties of all the agents may be taken into consideration, especially when prescribing PDE5 inhibitors
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

L-arginine (L-ARG)-nitric oxide (NO)-cGMP (cyclic guanosine monophosphate) cycle has been determined in various studies to be associated with epilepsy. Tadalafil is a potent inhibitor of phosphodiesterase 5 (PDE5) and increases the level of cGMP. Methylene blue (MB) is a lipophilic agent regulating intracellular electron flow as well as increasing the mitochondrial effectiveness. It also decreases cGMP levels by directly inhibiting guanylate cyclase.The aim of the present study was to evaluate the effects of MB and tadalafil on pentylenetetrazol-induced seizures. MB and tadalafil were administered 30 min prior to PTZ (70 mg/kg, i.p.) injection and the dose-response ratio was determined. Racine's Convulsion Scale and first myoclonic jerk (FMJ) onset time was used to evaluate seizures. Besides, drugs were administered 30 min prior to pentylenetetrazol (35 mg/kg, i.p.) injection and EEG was recorded from cortex and the spike wave discharges was determined in EEG. Plasma cGMP levels were measured in all groups. 5 and 10 mg/kg MB decreased Racine convulsion stage, increased FMJ onset time and decreased cGMP levels when compared with saline. 10 mg/kg tadalafil increased cGMP levels and Racine convulsion stage but decreased FMJ onset time compared with saline. Spike wave discharges were decreased in 5 and 10 mg/kg MB groups and increased in 10 mg/kg tadalafil group when compared with saline group.The proconvulsant properties of all the agents may be taken into consideration, especially when prescribing PDE5 inhibitors

Özet

L-Arjinin (L-ARG) -nitrik oksid (NO) -cGMP (siklik guanozin monofosfat) döngüsünün epilepsideki rolünü gösteren bazı çalışmalar vardır. Tadalafil, fosfodiesteraz-5 (PDE5) 'in güçlü bir inhibitörüdür ve cGMP'nin etkisini artırır. Metilen mavisi, hücre içi elektron akışını düzenleyen ve mitokondriyal etkinliğini artıran lipofilik bir ajandır. Aynı zamanda guanilat siklazı doğrudan inhibe ederek cGMP düzeylerini azaltır.Bu çalışmanın amacı metilen mavisi (MM) ve tadalafilin, pentilentetrazolle oluşturulan nöbetlere olan etkilerinin araştırılmasıdır. MM ve tadalafil, PTZ (70 mg/kg, i.p.) enjeksiyonundan 30 dk önce uygulanmıştır ve doz cevap oranları gösterilmiştir. Racine Konvülziyon Ölçeği (RKÖ) ve ilk myoklonik kasılmanın başlama zamanı (MKBZ), nöbetleri değerlendirmek için kullanılmıştır. Ayrıca ilaçlar pentilentetrazol (35 mg/kg, i.p.) enjeksiyonundan 30 dk önce uygulanarak korteksten EEG kayıtları alınmıştır ve EEG'deki diken yüzde değerleri ölçülmüştür. Tüm gruplarda plazma cGMP düzeyleri ölçülmüştür. 5 and 10 mg/kg MM verilen grupta salin grubuyla karşılaştırıldığında RKÖ değerleri ve cGMP düzeyleri azalırken , MKBZ artmıştır. 10 mg/kg tadalafil verilen grupta salin grubuna göre cGMP ve RKÖ değerleri artarken MKBZ azalmıştır. Diken dalga oranları salin grubuyla karşılaştırıldığında, 5 ve 10 mg/kg MM verilen grupta azalırken 10 mg/kg tadalafil grupta artmıştır. Özellikle PDE 5 inhibitörleri kullanılırken bu ajanların prokonvülzan özellikleri gözönünde bulundurulmalıdır

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Cite This Article

SOLMAZ, V., AKSOY, D., YURTOĞULLARI, Ş., SEMİZ, M., AYDEMİR, E., ERBAS, O. (2016). The Effects of Methylene Blue and Tadalafil in Pentylenetetrazole Induced Convulsion Model. Gülhane Tıp Dergisi, Cilt: 58 - Sayı: 3, 286–290. https://ajindex.com/articles/195087

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