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Epileptogenesis

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https://www.readbyqxmd.com/read/29447051/targeting-crosstalk-between-nuclear-factor-erythroid-derived-2-like-2-and-nuclear-factor-kappa-beta-pathway-by-nrf2-activator-dimethyl-fumarate-in-epileptogenesis
#1
Neha Singh, Sheekha Vijayanti, Lekha Saha
Epilepsy is a complex, chronic neurological disorder characterized by increased and abnormal synchronization of neuronal electrical activity, which is manifested as seizures. It is associated with many comorbid conditions such as depression, anxiety, sleep disorder, psychiatric disorder etc. which consequently causes higher mortality rate. The understanding of its cellular and molecular mechanism is partial, because of which it remains an ongoing health problem, despite the increasing availability of newer antiepileptic drugs...
February 15, 2018: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29442558/progression-of-convulsive-and-nonconvulsive-seizures-during-epileptogenesis-after-pilocarpine-induced-status-epilepticus
#2
Zachariah Z Smith, Alexander M Benison, Florencia M Bercum, F Edward Dudek, Daniel S Barth
Although convulsive seizures occurring during pilocarpine-induced epileptogenesis have received considerable attention, nonconvulsive seizures have not been closely examined, even though they may reflect the earliest signs of epileptogenesis and potentially guide research on antiepileptogenic interventions. The definition of nonconvulsive seizures based on brain electrical activity alone has been controversial. Here, we define and quantify electrographic properties of convulsive and nonconvulsive seizures in the context of the acquired epileptogenesis that occurs after pilocarpine-induced status epilepticus (SE)...
February 14, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29434572/stress-and-corticosteroids-aggravate-morphological-changes-in-the-dentate-gyrus-after-early-life-experimental-febrile-seizures-in-mice
#3
Jolien S van Campen, Ellen V S Hessel, Kirsten Bohmbach, Giorgio Rizzi, Paul J Lucassen, Sada Lakshmi Turimella, Eduardo H L Umeoka, Gideon F Meerhoff, Kees P J Braun, Pierre N E de Graan, Marian Joëls
Stress is the most frequently self-reported seizure precipitant in patients with epilepsy. Moreover, a relation between ear stress and epilepsy has been suggested. Although ear stress and stress hormones are known to influence seizure threshold in rodents, effects on the development of epilepsy (epileptogenesis) are still unclear. Therefore, we studied the consequences of ear corticosteroid exposure for epileptogenesis, under highly controlled conditions in an animal model. Experimental febrile seizures (eFS) were elicited in 10-day-old mice by warm-air induced hyperthermia, while a control group was exposed to a normothermic condition...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29432809/seizure-progression-and-inflammatory-mediators-promote-pericytosis-and-pericyte-microglia-clustering-at-the-cerebrovasculature
#4
Wendy Klement, Rita Garbelli, Emma Zub, Laura Rossini, Laura Tassi, Benoit Girard, Marine Blaquiere, Federica Bertaso, Julie Perroy, Frederic de Bock, Nicola Marchi
BACKGROUND: Cerebrovascular dysfunction and inflammation occur in experimental and clinical epilepsy. Here we asked whether pericytes, a pivotal cellular component of brain capillaries, undergo pathological modifications during experimental epileptogenesis and in human epilepsy. We evaluated whether pro-inflammatory cytokines, present in the brain during seizures, contribute to pericyte morphological modifications. METHODS: In vivo, unilateral intra-hippocampal kainic acid (KA) injections were performed in NG2DsRed/C57BL6 mice to induce status epilepticus (SE), epileptogenesis, and spontaneous recurrent seizures (SRS)...
February 9, 2018: Neurobiology of Disease
https://www.readbyqxmd.com/read/29431797/sustained-consumption-of-cocoa-based-dark-chocolate-enhances-seizure-like-events-in-the-mouse-hippocampus
#5
Ana Cicvaric, Tanja Bulat, Daniel Bormann, Jiaye Yang, Bastian Auer, Ivan Milenkovic, Maureen Cabatic, Radoslav Milicevic, Francisco J Monje
While the consumption of caffeine and cocoa has been associated with a variety of health benefits to humans, some authors have proposed that excessive caffeine intake may increase the frequency of epileptic seizures in humans and reduce the efficiency of antiepileptic drugs. Little is known, however, about the proconvulsant potential of the sustained, excessive intake of cocoa on hippocampal neural circuits. Using the mouse as an experimental model, we examined the effects of the chronic consumption of food enriched in cocoa-based dark chocolate on motor and mood-related behaviours as well as on the excitability properties of hippocampal neurons...
February 12, 2018: Food & Function
https://www.readbyqxmd.com/read/29431274/differential-contributions-of-ca2-activated-k-channels-and-na-k-atpases-to-the-generation-of-the-slow-afterhyperpolarization-in-ca1-pyramidal-cells
#6
Manindra Nath Tiwari, Sandesh Mohan, Yoav Biala, Yoel Yaari
In many types of CNS neurons, repetitive spiking produces a slow afterhyperpolarization (sAHP), providing sustained, intrinsically generated negative feedback to neuronal excitation. Changes in the sAHP have been implicated in learning behaviors, in cognitive decline in aging, and in epileptogenesis. Despite its importance in brain function, the mechanisms generating the sAHP are still controversial. Here we have addressed the roles of M-type K+ current (IM ), Ca2+ -gated K+ currents (ICa(K) 's) and Na+ /K+ -ATPases (NKAs) current to sAHP generation in adult rat CA1 pyramidal cells maintained at near-physiological temperature (35°C)...
February 12, 2018: Hippocampus
https://www.readbyqxmd.com/read/29427088/effect-of-resveratrol-on-oxidative-stress-and-mitochondrial-dysfunction-in-immature-brain-during-epileptogenesis
#7
Jaroslava Folbergrová, Pavel Ješina, Hana Kubová, Jakub Otáhal
The presence of oxidative stress in immature brain has been demonstrated during the acute phase of status epilepticus (SE). The knowledge regarding the long periods of survival after SE is not unequivocal, lacking direct evidence. To examine the presence and time profile of oxidative stress, its functional effect on mitochondria and the influence of an antioxidant treatment in immature rats during epileptogenesis, status epilepticus (SE) was induced in immature 12-day-old rats by Li-pilocarpine and at selected periods of the epileptogenesis; rat pups were subjected to examinations...
February 9, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29425964/alterations-of-l-type-voltage-dependent-calcium-channel-alpha-1-subunit-in-the-hippocampal-ca3-region-during-and-after-pilocarpine-induced-epilepsy
#8
Jie Hua Xu, Hui Wang, Wen Zhang, Feng Ru Tang
Voltage-dependent calcium channels (VDCC) have been shown to regulate neuronal excitability and their antagonists have been used clinically for the control of seizures. While functional studies of VDCC in epileptogenesis in the CA1 area of hippocampus or the dentate gyrus have been done, few studies were carried out in the CA3 area. Given the bursting characteristics of the CA3 neurons, we speculated that VDCC in the CA3 area might play an important role in the epileptogenesis. In the present study in the mouse pilocarpine model of temporal lobe epilepsy, we investigated the alterations of alpha 1 subunits of L-type VDCC in the CA3 area of the hippocampus at different stages of epileptogenesis, i...
February 7, 2018: Neurochemistry International
https://www.readbyqxmd.com/read/29423336/myoclonic-jerks-exposure-to-many-cats-and-neurotoxoplasmosis-in-an-immunocompetent-male
#9
Antonio Jose Reyes, Kanterpersad Ramcharan, Stanley Lawrence Giddings, Samuel Aboh, Fidel Rampersad
Background: Myoclonic jerks are due to sudden, brief, involuntary muscle contractions, positive myoclonus, or brief cessation of ongoing muscular activity, negative myoclonus, and may be difficult to recognize. Case Report: We describe an immunocompetent, adult, male patient with sleep-related, multifocal, myoclonic jerks and neurotoxoplasmosis with abnormal cerebrospinal fluid but normal brain imaging. There was complete resolution of the myoclonus with antitoxoplasmosis therapy after 1 week, and no relapse after 1 year...
2018: Tremor and Other Hyperkinetic Movements
https://www.readbyqxmd.com/read/29413716/proteomic-profiling-of-epileptogenesis-in-a-rat-model-focus-on-cell-stress-extracellular-matrix-and-angiogenesis
#10
Michael Keck, Roelof Maarten van Dijk, Cornelia A Deeg, Katharina Kistler, Andreas Walker, Eva-Lotta von Rüden, Vera Russmann, Stefanie M Hauck, Heidrun Potschka
Information about epileptogenesis-associated changes in protein expression patterns is of particular interest for future selection of target and biomarker candidates. Bioinformatic analysis of proteomic data sets can increase our knowledge about molecular alterations characterizing the different phases of epilepsy development following an initial epileptogenic insult. Here, we report findings from a focused analysis of proteomic data obtained for the hippocampus and parahippocampal cortex samples collected during the early post-insult phase, latency phase, and chronic phase of a rat model of epileptogenesis...
April 2018: Neurobiology of Disease
https://www.readbyqxmd.com/read/29413315/prediction-of-late-seizures-after-ischaemic-stroke-with-a-novel-prognostic-model-the-select-score-a-multivariable-prediction-model-development-and-validation-study
#11
Marian Galovic, Nico Döhler, Barbara Erdélyi-Canavese, Ansgar Felbecker, Philip Siebel, Julian Conrad, Stefan Evers, Michael Winklehner, Tim J von Oertzen, Hans-Peter Haring, Anna Serafini, Giorgia Gregoraci, Mariarosaria Valente, Francesco Janes, Gian Luigi Gigli, Mark R Keezer, John S Duncan, Josemir W Sander, Matthias J Koepp, Barbara Tettenborn
BACKGROUND: Stroke is one of the leading causes of acquired epilepsy in adults. An instrument to predict whether people are at high risk of developing post-stroke seizures is not available. We aimed to develop and validate a prognostic model of late (>7 days) seizures after ischaemic stroke. METHODS: In this multivariable prediction model development and validation study, we developed the SeLECT score based on five clinical predictors in 1200 participants who had an ischaemic stroke in Switzerland using backward elimination of a multivariable Cox proportional hazards model...
February 2018: Lancet Neurology
https://www.readbyqxmd.com/read/29410648/status-epilepticus-behavioral-and-electroencephalography-seizure-correlates-in-kainate-experimental-models
#12
REVIEW
Shaunik Sharma, Sreekanth Puttachary, Achala Thippeswamy, Anumantha G Kanthasamy, Thimmasettappa Thippeswamy
Various etiological factors, such as head injury, chemical intoxication, tumors, and gene mutation, can induce epileptogenesis. In animal models, status epilepticus (SE) triggers epileptogenesis. In humans, convulsive SE for >30 min can be a life-threatening medical emergency. The duration and severity of convulsive SE are highly variable in chemoconvulsant animal models. A continuous video-electroencephalography (EEG) recording, and/or diligent direct observation, facilitates quantification of exact duration of different stages of convulsive seizures (Racine stages 3-5) to determine the severity of SE...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29408225/partial-trkb-receptor-activation-suppresses-cortical-epileptogenesis-through-actions-on-parvalbumin-interneurons
#13
Feng Gu, Isabel Parada, Tao Yang, Frank M Longo, David A Prince
Post-traumatic epilepsy is one of the most common and difficult to treat forms of acquired epilepsy worldwide. Currently, there is no effective way to prevent post-traumatic epileptogenesis. It is known that abnormalities of interneurons, particularly parvalbumin-containing interneurons, play a critical role in epileptogenesis following traumatic brain injury. Thus, enhancing the function of existing parvalbumin interneurons might provide a logical therapeutic approach to prevention of post-traumatic epilepsy...
February 2, 2018: Neurobiology of Disease
https://www.readbyqxmd.com/read/29399089/effects-of-ganoderic-acid-a-on-lipopolysaccharide-induced-proinflammatory-cytokine-release-from-primary-mouse-microglia-cultures
#14
Baojin Chi, Shuqiu Wang, Sheng Bi, Wenbo Qin, Dongmei Wu, Zhenguo Luo, Shiliang Gui, Dongwei Wang, Xingzhong Yin, Fangfang Wang
For several thousand years, Ganoderma lucidum (Ling-Zhi in Chinese and Reishi in Japanese) has been widely used as a traditional medication for the prevention and treatment of various diseases in Asia. Its major biologically active components, ganoderic acids (GAs), exhibit significant medicinal value due to their anti-inflammatory effects. Dysregulation of microglial function may cause seizures or promote epileptogenesis through release of proinflammatory cytokines, including interleukin (IL)-1β, IL-6 and tumor necrosis factor (TNF)-α...
January 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29393419/hmgb1-mediates-microglia-activation-via-the-tlr4-nf-%C3%AE%C2%BAb-pathway-in-coriaria-lactone-induced-epilepsy
#15
Yunbo Shi, Lingli Zhang, Junfang Teng, Wang Miao
Epilepsy is a chronic and recurrent disease of the central nervous system, with a complex pathology. Recent studies have demonstrated that the activation of glial cells serve an important role in the development of epilepsy. The objective of the present study was to investigate the role of high‑mobility group box‑1 (HMGB1) in mediating the activation of glial cells through the toll‑like receptor 4 (TLR4)/nuclear factor (NF)‑κB signaling pathway in seizure, and the underlying mechanism. The brain tissue of post‑surgery patients with intractable epilepsy after resection and the normal control brain tissue of patients with craniocerebral trauma induced intracranial hypertension were collected...
January 25, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29377096/delayed-myelination-and-neurodevelopment-in-male-seizure-prone-versus-seizure-resistant-rats
#16
Pragati Sharma, Kim L Powell, Mary E Wlodek, Terence J O'Brien, Krista L Gilby
OBJECTIVE: Aberrant myelination and developmental delay have been reported in epilepsy. However, it is unclear whether these are linked to intrinsic mechanisms that support a predisposition toward seizures and the development of epilepsy. Thus, we compared rates of myelination and neurodevelopment in male rats selectively bred for enhanced susceptibility to kindling epileptogenesis (FAST) with male rats bred for resistance (SLOW). METHODS: Myelin-specific gene expression was compared in the brainstem, cerebellum, and cerebral hemisphere of FAST and SLOW rats on postnatal days (PNDs) 5, 11, 17, 23, and 90 to determine strain-specific myelination rates...
January 28, 2018: Epilepsia
https://www.readbyqxmd.com/read/29372545/prospects-of-cannabidiol-for-easing-status-epilepticus-induced-epileptogenesis-and-related-comorbidities
#17
REVIEW
Dinesh Upadhya, Olagide W Castro, Raghavendra Upadhya, Ashok K Shetty
The hippocampus is one of the most susceptible regions in the brain to be distraught with status epilepticus (SE) induced injury. SE can occur from numerous causes and is more frequent in children and the elderly population. Administration of a combination of antiepileptic drugs can abolish acute seizures in most instances of SE but cannot prevent the morbidity typically seen in survivors of SE such as cognitive and mood impairments and spontaneous recurrent seizures. This is primarily due to the inefficiency of antiepileptic drugs to modify the evolution of SE-induced initial precipitating injury into a series of epileptogenic changes followed by a state of chronic epilepsy...
January 25, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29364511/-18-f-ge180-positron-emission-tomographic-imaging-indicates-a-potential-double-hit-insult-in-the-intrahippocampal-kainate-mouse-model-of-temporal-lobe-epilepsy
#18
Mirjam Brackhan, Pablo Bascuñana, Tobias L Ross, Frank M Bengel, Jens P Bankstahl, Marion Bankstahl
OBJECTIVE: Accumulating evidence suggests that brain inflammation, elicited by epileptogenic insults, is involved in epilepsy development. Noninvasive nuclear imaging of brain inflammation in animal models of epileptogenesis represents a diagnostic in vivo approach with potential for direct translation into the clinic. Here, we investigated up-regulation of the translocator protein (TSPO) indicative of microglial activation by serial [18 F]GE180 positron emission tomographic (PET) imaging in a mouse model of temporal lobe epilepsy...
January 24, 2018: Epilepsia
https://www.readbyqxmd.com/read/29338461/mtor-dysregulation-and-tuberous-sclerosis-related-epilepsy
#19
Paolo Curatolo, Romina Moavero, Jackelien van Scheppingen, Eleonora Aronica
The mammalian target of rapamycin (mTOR) pathway has emerged as a key player for proper neural network development, and it is involved in epileptogenesis triggered by both genetic or acquired factors. Areas covered. The robust mTOR signaling deregulation observed in a large spectrum of epileptogenic developmental pathologies, such as focal cortical dysplasias and tuberous sclerosis complex (TSC), has been linked to germline and somatic mutations in mTOR pathway regulatory genes, increasing the spectrum of 'mTORopathies'...
January 27, 2018: Expert Review of Neurotherapeutics
https://www.readbyqxmd.com/read/29329108/cracking-novel-shared-targets-between-epilepsy-and-alzheimer-s-disease-need-of-the-hour
#20
Nitika Garg, Rupa Joshi, Bikash Medhi
Epilepsy and Alzheimer's disease (AD) are interconnected. It is well known that seizures are linked with cognitive impairment, and there are various shared etiologies between epilepsy and AD. The connection between hyperexcitability of neurons and cognitive dysfunction in the progression of AD or epileptogenesis plays a vital role for improving selection of treatment for both diseases. Traditionally, seizures occur less frequently and in later stages of age in patients with AD which in turn implies that neurodegeneration causes seizures...
January 12, 2018: Reviews in the Neurosciences
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