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Full-Text Articles in Neuroscience and Neurobiology
Role Of Gluk1 Kainate Receptors In Seizures, Epileptic Discharges, And Epileptogenesis, Brita Fritsch, Janine Reis, Maciej Gasior, Rafal M. Kaminski, Michael A. Rogawski
Role Of Gluk1 Kainate Receptors In Seizures, Epileptic Discharges, And Epileptogenesis, Brita Fritsch, Janine Reis, Maciej Gasior, Rafal M. Kaminski, Michael A. Rogawski
Michael A. Rogawski
Kainate receptors containing the GluK1 subunit have an impact on excitatory and inhibitory neurotransmission in brain regions, such as the amygdala and hippocampus, which are relevant to seizures and epilepsy. Here we used 2-amino-3-(3-hydroxy-5-tert-butylisoxazol-4-yl) propanoic acid (ATPA), a potent and selective agonist of kainate receptors that include the GluK1 subunit, in conjunction with mice deficient in GluK1 and GluK2 kainate receptor subunits to assess the role of GluK1 kainate receptors in provoking seizures and in kindling epileptogenesis. We found that systemic ATPA, acting specifically via GluK1 kainate receptors, causes locomotor arrest and forelimb extension (a unique behavioral characteristic of GluK1 …
Role Of Gluk1 Kainate Receptors In Seizures, Epileptic Discharges, And Epileptogenesis, Brita Fritsch, Janine Reis, Maciej Gasior, Rafal M. Kaminski, Michael A. Rogawski
Role Of Gluk1 Kainate Receptors In Seizures, Epileptic Discharges, And Epileptogenesis, Brita Fritsch, Janine Reis, Maciej Gasior, Rafal M. Kaminski, Michael A. Rogawski
Michael A. Rogawski
Kainate receptors containing the GluK1 subunit have an impact on excitatory and inhibitory neurotransmission in brain regions, such as the amygdala and hippocampus, which are relevant to seizures and epilepsy. Here we used 2-amino-3-(3-hydroxy-5-tert-butylisoxazol-4-yl) propanoic acid (ATPA), a potent and selective agonist of kainate receptors that include the GluK1 subunit, in conjunction with mice deficient in GluK1 and GluK2 kainate receptor subunits to assess the role of GluK1 kainate receptors in provoking seizures and in kindling epileptogenesis. We found that systemic ATPA, acting specifically via GluK1 kainate receptors, causes locomotor arrest and forelimb extension (a unique behavioral characteristic of GluK1 …
The Intrinsic Severity Hypothesis Of Pharmacoresistance To Antiepileptic Drugs, Michael Rogawski
The Intrinsic Severity Hypothesis Of Pharmacoresistance To Antiepileptic Drugs, Michael Rogawski
Michael A. Rogawski
Pharmacoresistance to antiepileptic drugs (AEDs) is a barrier to seizure freedom for many persons with epilepsy. For nearly two decades, pharmacoresistance has been framed in terms of factors affecting the access of AEDs to their molecular targets in the brain or the actions of the drugs on these targets. Shortcomings in this prevailing view led to the formulation of the intrinsic severity hypothesis of pharmacoresistance to AEDs, which is based on the recognition that there are neurobiologic factors that confer phenotypic variation among individuals with etiologically similar forms of epilepsy and postulates that more severe epilepsy is more difficult to …
Neurosteroids—Endogenous Regulators Of Seizure Susceptibility And Role In The Treatment Of Epilepsy, Doodipala S. Reddy, Michael A. Rogawski
Neurosteroids—Endogenous Regulators Of Seizure Susceptibility And Role In The Treatment Of Epilepsy, Doodipala S. Reddy, Michael A. Rogawski
Michael A. Rogawski
Certain steroid hormone metabolites that have activity as modulators of GABA-A receptors but lack conventional hormonal effects—including allopregnanolone and allotetrahydrodeoxycorticosterone—are synthesized within the brain, predominantly in principle (excitatory) neurons, and also in peripheral tissues. At low concentrations, such neurosteroids potentiate GABA-A receptor currents, whereas at higher concentrations they directly activate the receptor; large magnitude effects occur on nonsynaptic delta subunit-containing GABA-A receptors that mediate tonic currents. GABA-A receptor modulatory neurosteroids confer seizure protection in diverse animal models, without tolerance during chronic administration. Endogenous neurosteroids may play a role in catamenial epilepsy, stress-induced changes in seizure susceptibility, temporal lobe epilepsy, and …
Revisiting Ampa Receptors As An Antiepileptic Drug Target, Michael A. Rogawski
Revisiting Ampa Receptors As An Antiepileptic Drug Target, Michael A. Rogawski
Michael A. Rogawski
In the 1990s there was intense interest in ionotropic glutamate receptors as therapeutic targets for diverse neurological disorders, including epilepsy. NMDA receptors were thought to play a key role in the generation of seizures, leading to clinical studies of NMDA receptor blocking drugs in epilepsy. Disappointing results dampened enthusiasm for ionotropic glutamate receptors as a therapeutic target. Eventually it became appreciated that another type of ionotropic glutamate receptor, the AMPA receptor, is actually the predominant mediator of excitatory neurotransmission in the central nervous system and moreover that AMPA receptors are critical to the generation and spread of epileptic activity. As …
Anticonvulsant And Proconvulsant Actions Of 2-Deoxy-D-Glucose, Maciej Gasior, Jessica Yankura, Adam L. Hartman, Amy French, Michael A. Rogawski
Anticonvulsant And Proconvulsant Actions Of 2-Deoxy-D-Glucose, Maciej Gasior, Jessica Yankura, Adam L. Hartman, Amy French, Michael A. Rogawski
Michael A. Rogawski
Purpose: 2-Deoxy-D-glucose (2-DG), a glucose analog that accumulates in cells and interferes with carbohydrate metabolism by inhibiting glycolytic enzymes, has anticonvulsant actions. Recognizing that severe glucose deprivation can induce seizures, we sought to determine whether acute treatment with 2-DG can promote seizure susceptibility by assessing its effects on seizure threshold. For comparison, we studied 3-methyl-glucose (3-MG), which like 2-DG accumulates in cells and reduces glucose uptake, but does not inhibit glycolysis. Methods: Mice were treated with 2-DG or 3-MG and the seizure threshold determined in the 6-Hz test, the mouse electroshock seizure threshold (MEST) test, and the intravenous pentylenetetrazol (i.v. …
Epilepsy: Mechanisms Of Drug Action And Clinical Treatment, William Theodore, Michael Rogawski
Epilepsy: Mechanisms Of Drug Action And Clinical Treatment, William Theodore, Michael Rogawski
Michael A. Rogawski
No abstract provided.
Neurosteroids: Endogenous Modulators Of Seizure Susceptibility, Michael A. Rogawski, Doodipala S. Reddy
Neurosteroids: Endogenous Modulators Of Seizure Susceptibility, Michael A. Rogawski, Doodipala S. Reddy
Michael A. Rogawski
No abstract provided.
Ampa Receptors In Epilepsy And As Targets For Antiepileptic Drugs, Michael A. Rogawski, Sean D. Donevan
Ampa Receptors In Epilepsy And As Targets For Antiepileptic Drugs, Michael A. Rogawski, Sean D. Donevan
Michael A. Rogawski
No abstract provided.