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Drug induced seizure

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https://www.readbyqxmd.com/read/28936791/nmda-receptors-and-no-cgmp-signaling-pathway-mediate-the-diazepam-induced-sensitization-to-withdrawal-signs-in-mice
#1
Sylwia Talarek, Joanna Listos, Jolanta Orzelska-Gorka, Anna Serefko, Jolanta Kotlińska
The goal of the present study was to examine the effects of N-methyl-aspartate (NMDA) receptor antagonists-memantine and ketamine and the drugs modifying the NO:cGMP pathway-NG-nitro-L-arginine methyl ester (L-NAME) and 7-nitroindazole (7-NI), the endogenous precursor of NO-L-arginine, and the guanylyl cyclase inhibitor-methylene blue (MB) on the development of sensitization to withdrawal signs precipitated after chronic, interrupted treatment with diazepam, a benzodiazepine receptor agonist, in mice. To develop the sensitization, the mice were divided into groups: continuously and sporadically (with two diazepam-free periods) treated with diazepam (15 mg/kg, sc)...
September 21, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28934547/multifunctional-hybrid-compounds-derived-from-2-2-5-dioxopyrrolidin-1-yl-3-methoxypropanamides-with-anticonvulsant-and-antinociceptive-properties
#2
Michał Abram, Mirosław Zagaja, Szczepan Mogilski, Marta Andres-Mach, Gniewomir Latacz, Sebastian Baś, Jarogniew J Łuszczki, Katarzyna Kieć-Kononowicz, Krzysztof Kamiński
The focused set of new pyrrolidine-2,5-diones as potential broad-spectrum hybrid anticonvulsants was described. These derivatives integrate on the common structural scaffold the chemical fragments of well-known antiepileptic drugs such as ethosuximide, levetiracetam, and lacosamide. Such hybrids demonstrated effectiveness in two of the most widely used animal seizure models, namely, the maximal electroshock (MES) test and the psychomotor 6 Hz (32 mA) seizure model. Compound 33 showed the highest anticonvulsant activity in these models (ED50 MES = 79...
September 21, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28932183/plant-polyphenols-and-exendin-4-prevent-hyperactivity-and-tnf-%C3%AE-release-in-lps-treated-in-vitro-neuron-astrocyte-microglial-networks
#3
Francesca Gullo, Michela Ceriani, Alessia D'Aloia, Enzo Wanke, Andrew Constanti, Barbara Costa, Marzia Lecchi
Increasing evidence supports a decisive role for neuroinflammation in the neurodegenerative process of several central nervous system (CNS) disorders. Microglia are essential mediators of neuroinflammation and can regulate a broad spectrum of cellular responses by releasing reactive oxygen intermediates, nitric oxide, proteases, excitatory amino acids, and cytokines. We have recently shown that also in ex-vivo cortical networks of neurons, astrocytes and microglia, an increased level of tumor necrosis factor-alpha (TNF-α) was detected a few hours after exposure to the bacterial endotoxin lipopolysaccharide (LPS)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28931433/role-of-gabaa-receptors-in-alcohol-use-disorders-suggested-by-chronic-intermittent-ethanol-cie-rodent-model
#4
REVIEW
Richard W Olsen, Jing Liang
GABAergic inhibitory transmission is involved in the acute and chronic effects of ethanol on the brain and behavior. One-dose ethanol exposure induces transient plastic changes in GABAA receptor subunit levels, composition, and regional and subcellular localization. Rapid down-regulation of early responder δ subunit-containing GABAA receptor subtypes mediating ethanol-sensitive tonic inhibitory currents in critical neuronal circuits corresponds to rapid tolerance to ethanol's behavioral responses. Slightly slower, α1 subunit-containing GABAA receptor subtypes mediating ethanol-insensitive synaptic inhibition are down-regulated, corresponding to tolerance to additional ethanol behaviors plus cross-tolerance to other GABAergic drugs including benzodiazepines, anesthetics, and neurosteroids, especially sedative-hypnotic effects...
September 20, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28926841/beneficial-combination-of-lacosamide-with-retigabine-in-experimental-animals-an-isobolographic-analysis
#5
Jarogniew J Luszczki, Mirosław Zagaja, Barbara Miziak, Maria W Kondrat-Wrobel, Katarzyna Zaluska, Paula Wroblewska-Luczka, Piotr Adamczuk, Stanislaw J Czuczwar, Magdalena Florek-Luszczki
BACKGROUND/AIM: To isobolographically determine the types of interactions that occur between retigabine and lacosamide (LCM; two third-generation antiepileptic drugs) with respect to their anticonvulsant activity and acute adverse effects (sedation) in the maximal electroshock-induced seizures (MES) and chimney test (motor performance) in adult male Swiss mice. METHODS: Type I isobolographic analysis for nonparallel dose-response effects for the combination of retigabine with LCM (at the fixed-ratio of 1:1) in both the MES and chimney test in mice was performed...
September 20, 2017: Pharmacology
https://www.readbyqxmd.com/read/28924012/inhibition-of-il-1%C3%AE-signaling-normalizes-nmda-dependent-neurotransmission-and-reduces-seizure-susceptibility-in-a-mouse-model-of-creutzfeldt-jakob-disease
#6
Ilaria Bertani, Valentina Iori, Massimo Trusel, Mattia Maroso, Claudia Foray, Susanna Mantovani, Raffaella Tonini, Annamaria Vezzani, Roberto Chiesa
Creutzfeldt-Jakob disease (CJD) is a neurodegenerative disorder caused by prion protein (PrP) misfolding, clinically recognized by cognitive and motor deficits, electroencephalographic (EEG) abnormalities and seizures. Its neurophysiological bases are not known. To assess the potential involvement of N-methyl-D-aspartate receptor (NMDAR) dysfunction, we analyzed NMDA-dependent synaptic plasticity in hippocampal slices from Tg(CJD) mice, which model a genetic form of CJD. Because PrP depletion may result in functional upregulation of NMDARs, we also analyzed PrP knockout (KO) mice...
September 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28920921/increased-intracellular-proteolysis-reduces-disease-severity-in-an-er-stress-associated-dwarfism
#7
Lorna A Mullan, Ewa J Mularczyk, Louise H Kung, Mitra Forouhan, Jordan Ma Wragg, Royston Goodacre, John F Bateman, Eileithyia Swanton, Michael D Briggs, Raymond P Boot-Handford
The short-limbed dwarfism metaphyseal chondrodysplasia type Schmid (MCDS) is linked to mutations in type X collagen, which increase ER stress by inducing misfolding of the mutant protein and subsequently disrupting hypertrophic chondrocyte differentiation. Here, we show that carbamazepine (CBZ), an autophagy-stimulating drug that is clinically approved for the treatment of seizures and bipolar disease, reduced the ER stress induced by 4 different MCDS-causing mutant forms of collagen X in human cell culture...
September 18, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28919758/a-case-of-schizophrenia-comorbid-for-tetralogy-of-fallot-treated-with-clozapine-further-considerations-on-a-role-for-22q-11-2-in-the-proneness-for-seizures
#8
Hiroko Kashiwagi, Satoru Ikezawa, Tomiki Sumiyoshi, Atsuko Kadono, Kazuhiko Segawa, Kazuyoshi Takeda, Mayu Omori, Hisako Taguchi, Naotsugu Hirabayashi
We present a case of schizophrenia comorbid for tetralogy of Fallot, without chromosome 22q.11.2 deletion or duplication, treated successfully with a combination of clozapine and antiepileptic drugs. Although clozapine by itself initially triggered convulsive seizures, we continued it with co-administration of valproate and topiramate. This combined treatment did not affect cardiac function of the patient, who experienced a favorable clinical course in terms of symptomatology and functional outcomes. To our knowledge, we provide the first report on a patient with tetralogy of Fallot, in whom 22q...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28903847/dengue-hemorrhagic-fever-arare-cause-of-acute-liver-failure
#9
Aisha Nazeer, Ayesha Aslam Rai, Nasir Hassan Luck, Abbas Ali Yousuf Tasneem
Acute liver failure (ALF) is an acute medical emergency which carries high mortality without liver transplantation. Various hepatotropic viruses, drug induced liver injury, auto immune hepatitis, and metabolic liver diseases are the commonly implicated etiologic agents. Liver involvement in dengue hemorrhagic fever (DHF) is quite common, but acute liver failure is its rare complication. Neurological complications are also commonly seen in DHF. Ateenage girl presented with high grade fever and subconjunctival hemorrhage, and later developed jaundice due to acute liver failure...
August 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28898171/febrile-infection-related-epilepsy-syndrome-fires-a-literature-review-and-case-study
#10
Kristy Fox, Mary Ellen Wells, Michael Tennison, Bradley Vaughn
Febrile infection-related epilepsy syndrome (FIRES) is a catastrophic epileptic syndrome that strikes previously healthy children aged 3-15 years and has an unknown pathogenesis and few treatments. These children experience a nonspecific febrile illness that is followed by prolonged refractory status epilepticus. Although the etiology is unknown, FIRES has a biphasic presentation, with the acute phase beginning as seizure activity lasting 1-12 weeks, then followed by the chronic phase, which is characterized by refractory seizures that cluster every 2-4 weeks, and may continue to be multifocal and independent...
2017: Neurodiagnostic Journal
https://www.readbyqxmd.com/read/28894217/the-faah-inhibitor-urb597-suppresses-hippocampal-maximal-dentate-afterdischarges-and-restores-seizure-induced-impairment-of-short-and-long-term-synaptic-plasticity
#11
Roberto Colangeli, Massimo Pierucci, Arcangelo Benigno, Giuseppe Campiani, Sefania Butini, Giuseppe Di Giovanni
Synthetic cannabinoids and phytocannabinoids have been shown to suppress seizures both in humans and experimental models of epilepsy. However, they generally have a detrimental effect on memory and memory-related processes. Here we compared the effect of the inhibition of the endocannabinoid (eCB) degradation versus synthetic CB agonist on limbic seizures induced by maximal dentate activation (MDA) acute kindling. Moreover, we investigated the dentate gyrus (DG) granule cell reactivity and synaptic plasticity in naïve and in MDA-kindled anaesthetised rats...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28890399/activated-brain-derived-neurotrophic-factor-trkb-signaling-in-rat-dorsal-and-ventral-hippocampi-following-10-day-electroconvulsive-seizure-treatment
#12
Shingo Enomoto, Kunio Shimizu, Masashi Nibuya, Eiji Suzuki, Kiyoshi Nagata, Takashi Kondo
Electroconvulsive therapy (ECT) is still the most effective strategy to treat severe and drug-resistant depressive disorders. Electroconvulsive seizure (ECS), which induces neuroplastic structural alterations and resilient behavioral changes in experimental animals, is the model of the ECT for human depression. ECT is typically administered three times per week for up to 4 weeks, while ECS treatments are administered daily for 10days. The increased expression of hippocampal brain-derived neurotrophic factor (BDNF) induced by antidepressive ECS treatment in experimental animals has been well documented...
September 7, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28886886/are-changes-in-excitability-in-the-hippocampus-of-adult-male-rats-induced-by-prenatal-methamphetamine-exposure-or-stress
#13
Klara Bernaskova, Simona Tomkova, Romana Slamberova
Prenatal stress and drug exposure induce permanent alterations of the brain. Even though different brain structures are involved, alterations almost always refer to the hippocampus. The aim of this study was to investigate the excitability of hippocampal slices in low-magnesium epilepsy model of prenatally methamphetamine (MA, 5mg/kg sc.) or saline (sc., stress model) exposed animals in adult male rats. The second aim was to investigate, if a low dose of MA (1ml/kgs.c.) administered in adulthood changes the hippocampal activity of these animals...
September 5, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28877036/recovery-from-ropivacaine-induced-or-levobupivacaine-induced-cardiac-arrest-in-rats-comparison-of-lipid-emulsion-effects
#14
Masashi Yoshimoto, Takashi Horiguchi, Tetsu Kimura, Toshiaki Nishikawa
BACKGROUND: Lipid emulsion treatment appears to have application in the treatment of local anesthetic-induced cardiac arrest. To examine whether the efficacy of lipid resuscitation in the treatment of local anesthetic-induced cardiac arrest is affected by lipophilicity, the effects of lipid infusions were compared between levobupivacaine-induced (high lipophilicity) and ropivacaine-induced (lower lipophilicity) rat cardiac arrest model. METHODS: A total of 28 female Sprague-Dawley rats were anesthetized using sevoflurane, which subsequently underwent tracheostomy, followed by femoral artery and vein cannulation...
September 2, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28874764/natural-%C3%A2-9-thc-and-synthetic-jwh-018-cannabinoids-induce-seizures-by-acting-through-the-cannabinoid-cb1-receptor
#15
Olga Malyshevskaya, Kosuke Aritake, Mahesh K Kaushik, Nahoko Uchiyama, Yoan Cherasse, Ruri Kikura-Hanajiri, Yoshihiro Urade
Natural cannabinoids and their synthetic substitutes are the most widely used recreational drugs. Numerous clinical cases describe acute toxic symptoms and neurological consequences following inhalation of the mixture of synthetic cannabinoids known as "Spice." Here we report that an intraperitoneal administration of the natural cannabinoid Δ(9)-tetrahydrocannabinol (10 mg/kg), one of the main constituent of marijuana, or the synthetic cannabinoid JWH-018 (2.5 mg/kg) triggered electrographic seizures in mice, recorded by electroencephalography and videography...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28870844/inhibitory-synapse-deficits-caused-by-familial-%C3%AE-1-gabaa-receptor-mutations-in-epilepsy
#16
Xiumin Chen, Nela Durisic, Joseph W Lynch, Angelo Keramidas
Epilepsy is a spectrum of neurological disorders with many causal factors. The GABA type-A receptor (GABAAR) is a major genetic target for heritable human epilepsies. Here we examine the functional effects of three epilepsy-causing mutations to the α1 subunit (α1(T10'I), α1(D192N) and α1(A295D)) on inhibitory postsynaptic currents (IPSCs) mediated by the major synaptic GABAAR isoform, α1β2γ2L. We employed a neuron - HEK293 cell heterosynapse preparation to record IPSCs mediated by mutant-containing GABAARs in isolation from other GABAAR isoforms...
September 1, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28867572/pharmacokinetic-and-pharmacodynamic-interaction-of-hydroalcoholic-extract-of-ocimum-sanctum-with-valproate
#17
Sudhir Chandra Sarangi, Dipesh Joshi, Ritesh Kumar, Thomas Kaleekal, Yogendra Kumar Gupta
For effective control of seizures, antiepileptic drugs (AEDs) are administered at higher dose which is associated with several adverse effects. This study envisaged antiepileptic and neuroprotective potential of Tulsi, a commonly used herb for its immunomodulatory property. The optimal dose of Ocimum sanctum hydroalcoholic extract (OSHE) was determined using maximal electroshock seizure (MES)- and pentylenetetrazol (PTZ)-induced seizure models in Wistar rats (200-250g) after administering OSHE (200-1000mg/kg) orally for 14days...
August 31, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28833459/persistent-seizure-control-in-epileptic-mice-transplanted-with-gaba-progenitors
#18
Mariana L Casalia, MacKenzie A Howard, Scott C Baraban
Objective A significant proportion of the more than 50 million people world-wide currently suffering with epilepsy are resistant to antiepileptic drugs (AEDs). As an alternative to AEDs, novel therapies based on cell transplantation offer an opportunity for long-lasting modification of epileptic circuits. To develop such a treatment requires careful preclinical studies in a chronic epilepsy model featuring unprovoked seizures, hippocampal histopathology, and behavioral comorbidities. Methods Transplantation of progenitor cells from embryonic medial or caudal ganglionic eminence (MGE, CGE) were made in a well-characterized mouse model of status epilepticus-induced epilepsy (systemic pilocarpine)...
August 18, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28833036/treatment-with-lacosamide-impedes-generalized-seizures-in-a-rodent-model-of-cortical-dysplasia
#19
Ashley D Nemes, Rebecca O'Dwyer, Imad M Najm, Zhong Ying, Jorge Gonzalez-Martinez, Andreas V Alexopoulos
OBJECTIVE: Epilepsy is a common neurologic disorder resulting in spontaneous, recurrent seizures. About 30-40% of patients are not responsive to pharmacologic therapies. This may be due to the differences between individual patients such as etiology, underlying pathophysiology, and seizure focus, and it highlights the importance of new drug discovery and testing in this field. Our goal was to determine the efficacy of lacosamide (LCM), a drug approved for the treatment of focal seizures, in a model of generalized epilepsy with cortical dysplasia (CD)...
August 20, 2017: Epilepsia
https://www.readbyqxmd.com/read/28832001/acquired-epileptic-opercular-syndrome-related-to-a-heterozygous-deleterious-substitution-in-grin2a
#20
Claudine Sculier, Anne-Sophie Tilmant, Xavier De Tiège, Sanda Giurgea, Philippe Paquier, Gabrielle Rudolf, Gaetan Lesca, Patrick Van Bogaert
Epileptic encephalopathies with continuous spike-and-waves during sleep (CSWS) are characterized by cognitive or language impairment, and are occasionally associated with pathogenic variants of the GRIN2A gene. In these disorders, speech dysfunction could be either related to cerebral dysfunction caused by the GRIN2A deleterious variant or intense interictal epileptic activity. Here, we present a patient with apraxia of speech, clearly linked to severity of epilepsy, carrying a GRIN2A variant. A 6-year-old boy developed acute regression of expressive language following epileptic seizures, leading to complete mutism, at which time EEG revealed CSWS...
August 23, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
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