Biomaterial Database

NMDA-dependent audiogenic seizures are differentially regulated by inferior colliculus subnuclei. 1994

V C Terra, and N Garcia-Cairasco

Department of Physiology, Ribeirão Preto School of Medicine, University of São Paulo, Brazil.

Wistar rats were classified as susceptible (S) and resistant (R) to audiogenic seizures (AS) by evaluation of their response to high intensity sound stimulation (110.3 dB). R rats usually do not respond with any convulsive behavior to sound stimulation, whereas S animals develop a complex wild running sequence plus tonic-clonic seizure patterns after sound stimulation. Thus, R rats were injected with phosphate buffer (PB; 0.2 microliter) or N-methyl-D-aspartate (NMDA) in three different doses (2.0 micrograms, 2.5 micrograms and 3.0 micrograms/0.2 microliter) into central ventral or cortical dorsal inferior colliculus (IC) nuclei. Dose-response curves were evaluated by means of an ethological method in which behavioral sequences typical of S and R animals were quantitated. Animals displayed more severe spontaneous audiogenic-like seizures with the dose of 2.5 micrograms/0.2 microliter NMDA, which were potentiated by the acoustic stimulus. Significant differences were apparent between central and cortical nuclei and more severe seizures were observed in IC cortical microinjected animals. These audiogenic seizures were blocked with microinjections of 2-amino-7-phosphono-heptanoate (AP7) applied just before 2.5 micrograms NMDA microinjections into central or cortical nuclei. In S rats, AP7 totally blocked AS when microinjected into the central IC and partially, but significantly, blocked AS when applied into the cortical IC nucleus. In the last case, wild running was still present in 100% of the animals after AP7 treatment. These data may suggest an NMDA-dependent differential participation of IC subnuclei in the development of AS.

UI	MeSH Term	Description	Entries
D007245	Inferior Colliculi	The posterior pair of the quadrigeminal bodies which contain centers for auditory function.	Colliculus, Inferior,Brachial Nucleus of the Inferior Colliculus,Caudal Colliculus,Colliculus Inferior,Inferior Colliculus,Posterior Colliculus,Colliculi, Inferior,Colliculus Inferiors,Colliculus, Caudal,Colliculus, Posterior,Inferior, Colliculus,Inferiors, Colliculus
D009435	Synaptic Transmission	The communication from a NEURON to a target (neuron, muscle, or secretory cell) across a SYNAPSE. In chemical synaptic transmission, the presynaptic neuron releases a NEUROTRANSMITTER that diffuses across the synaptic cleft and binds to specific synaptic receptors, activating them. The activated receptors modulate specific ion channels and/or second-messenger systems in the postsynaptic cell. In electrical synaptic transmission, electrical signals are communicated as an ionic current flow across ELECTRICAL SYNAPSES.	Neural Transmission,Neurotransmission,Transmission, Neural,Transmission, Synaptic
D009474	Neurons	The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM.	Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D001931	Brain Mapping	Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.	Brain Electrical Activity Mapping,Functional Cerebral Localization,Topographic Brain Mapping,Brain Mapping, Topographic,Functional Cerebral Localizations,Mapping, Brain,Mapping, Topographic Brain
D004830	Epilepsy, Tonic-Clonic	A generalized seizure disorder characterized by recurrent major motor seizures. The initial brief tonic phase is marked by trunk flexion followed by diffuse extension of the trunk and extremities. The clonic phase features rhythmic flexor contractions of the trunk and limbs, pupillary dilation, elevations of blood pressure and pulse, urinary incontinence, and tongue biting. This is followed by a profound state of depressed consciousness (post-ictal state) which gradually improves over minutes to hours. The disorder may be cryptogenic, familial, or symptomatic (caused by an identified disease process). (From Adams et al., Principles of Neurology, 6th ed, p329)	Epilepsy, Grand Mal,Epilepsy, Major,Grand Mal Seizure Disorder,Major Motor Seizure Disorder,Seizure Disorder, Tonic Clonic,Convulsions, Grand Mal,Cryptogenic Tonic-Clonic Epilepsy,Epilepsy, Tonic-Clonic, Cryptogenic,Epilepsy, Tonic-Clonic, Familial,Epilepsy, Tonic-Clonic, Symptomatic,Familial Tonic-Clonic Epilepsy,Seizure Disorder, Grand Mal,Seizure Disorder, Major Motor,Symptomatic Tonic-Clonic Epilepsy,Tonic Clonic Convulsions,Tonic-Clonic Convulsion Disorder,Tonic-Clonic Convulsion Syndrome,Tonic-Clonic Seizure Disorder,Tonic-Clonic Seizure Syndrome,Convulsion Disorder, Tonic-Clonic,Convulsion Disorders, Tonic-Clonic,Convulsion Syndrome, Tonic-Clonic,Convulsion Syndromes, Tonic-Clonic,Convulsion, Grand Mal,Convulsion, Tonic Clonic,Convulsions, Tonic Clonic,Cryptogenic Tonic Clonic Epilepsy,Cryptogenic Tonic-Clonic Epilepsies,Disorder, Tonic-Clonic Convulsion,Disorder, Tonic-Clonic Seizure,Disorders, Tonic-Clonic Convulsion,Disorders, Tonic-Clonic Seizure,Epilepsies, Cryptogenic Tonic-Clonic,Epilepsies, Familial Tonic-Clonic,Epilepsies, Symptomatic Tonic-Clonic,Epilepsies, Tonic-Clonic,Epilepsy, Cryptogenic Tonic-Clonic,Epilepsy, Familial Tonic-Clonic,Epilepsy, Symptomatic Tonic-Clonic,Epilepsy, Tonic Clonic,Familial Tonic Clonic Epilepsy,Familial Tonic-Clonic Epilepsies,Grand Mal Convulsion,Grand Mal Convulsions,Grand Mal Epilepsy,Major Epilepsies,Major Epilepsy,Seizure Disorder, Tonic-Clonic,Seizure Disorders, Tonic-Clonic,Seizure Syndrome, Tonic-Clonic,Seizure Syndromes, Tonic-Clonic,Symptomatic Tonic Clonic Epilepsy,Symptomatic Tonic-Clonic Epilepsies,Syndrome, Tonic-Clonic Convulsion,Syndrome, Tonic-Clonic Seizure,Syndromes, Tonic-Clonic Convulsion,Syndromes, Tonic-Clonic Seizure,Tonic Clonic Convulsion,Tonic Clonic Convulsion Disorder,Tonic Clonic Convulsion Syndrome,Tonic Clonic Seizure Disorder,Tonic Clonic Seizure Syndrome,Tonic-Clonic Convulsion Disorders,Tonic-Clonic Convulsion Syndromes,Tonic-Clonic Epilepsies,Tonic-Clonic Epilepsies, Cryptogenic,Tonic-Clonic Epilepsies, Familial,Tonic-Clonic Epilepsies, Symptomatic,Tonic-Clonic Epilepsy,Tonic-Clonic Epilepsy, Cryptogenic,Tonic-Clonic Epilepsy, Familial,Tonic-Clonic Epilepsy, Symptomatic,Tonic-Clonic Seizure Disorders,Tonic-Clonic Seizure Syndromes
D000161	Acoustic Stimulation	Use of sound to elicit a response in the nervous system.	Auditory Stimulation,Stimulation, Acoustic,Stimulation, Auditory
D000596	Amino Acids	Organic compounds that generally contain an amino (-NH2) and a carboxyl (-COOH) group. Twenty alpha-amino acids are the subunits which are polymerized to form proteins.	Amino Acid,Acid, Amino,Acids, Amino
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D000927	Anticonvulsants	Drugs used to prevent SEIZURES or reduce their severity.	Anticonvulsant,Anticonvulsant Drug,Anticonvulsive Agent,Anticonvulsive Drug,Antiepileptic,Antiepileptic Agent,Antiepileptic Agents,Antiepileptic Drug,Anticonvulsant Drugs,Anticonvulsive Agents,Anticonvulsive Drugs,Antiepileptic Drugs,Antiepileptics,Agent, Anticonvulsive,Agent, Antiepileptic,Agents, Anticonvulsive,Agents, Antiepileptic,Drug, Anticonvulsant,Drug, Anticonvulsive,Drug, Antiepileptic,Drugs, Anticonvulsant,Drugs, Anticonvulsive,Drugs, Antiepileptic
D012640	Seizures	Clinical or subclinical disturbances of cortical function due to a sudden, abnormal, excessive, and disorganized discharge of brain cells. Clinical manifestations include abnormal motor, sensory and psychic phenomena. Recurrent seizures are usually referred to as EPILEPSY or "seizure disorder."	Absence Seizure,Absence Seizures,Atonic Absence Seizure,Atonic Seizure,Clonic Seizure,Complex Partial Seizure,Convulsion,Convulsions,Convulsive Seizure,Convulsive Seizures,Epileptic Seizure,Epileptic Seizures,Generalized Absence Seizure,Generalized Tonic-Clonic Seizures,Jacksonian Seizure,Myoclonic Seizure,Non-Epileptic Seizure,Nonepileptic Seizure,Partial Seizure,Seizure,Seizures, Convulsive,Seizures, Focal,Seizures, Generalized,Seizures, Motor,Seizures, Sensory,Tonic Clonic Seizure,Tonic Seizure,Tonic-Clonic Seizure,Atonic Absence Seizures,Atonic Seizures,Clonic Seizures,Complex Partial Seizures,Convulsion, Non-Epileptic,Generalized Absence Seizures,Myoclonic Seizures,Non-Epileptic Seizures,Nonepileptic Seizures,Partial Seizures,Petit Mal Convulsion,Seizures, Auditory,Seizures, Clonic,Seizures, Epileptic,Seizures, Gustatory,Seizures, Olfactory,Seizures, Somatosensory,Seizures, Tonic,Seizures, Tonic-Clonic,Seizures, Vertiginous,Seizures, Vestibular,Seizures, Visual,Single Seizure,Tonic Seizures,Tonic-Clonic Seizures,Absence Seizure, Atonic,Absence Seizure, Generalized,Absence Seizures, Atonic,Absence Seizures, Generalized,Auditory Seizure,Auditory Seizures,Clonic Seizure, Tonic,Clonic Seizures, Tonic,Convulsion, Non Epileptic,Convulsion, Petit Mal,Convulsions, Non-Epileptic,Focal Seizure,Focal Seizures,Generalized Seizure,Generalized Seizures,Generalized Tonic Clonic Seizures,Generalized Tonic-Clonic Seizure,Gustatory Seizure,Gustatory Seizures,Motor Seizure,Motor Seizures,Non Epileptic Seizure,Non Epileptic Seizures,Non-Epileptic Convulsion,Non-Epileptic Convulsions,Olfactory Seizure,Olfactory Seizures,Partial Seizure, Complex,Partial Seizures, Complex,Seizure, Absence,Seizure, Atonic,Seizure, Atonic Absence,Seizure, Auditory,Seizure, Clonic,Seizure, Complex Partial,Seizure, Convulsive,Seizure, Epileptic,Seizure, Focal,Seizure, Generalized,Seizure, Generalized Absence,Seizure, Generalized Tonic-Clonic,Seizure, Gustatory,Seizure, Jacksonian,Seizure, Motor,Seizure, Myoclonic,Seizure, Non-Epileptic,Seizure, Nonepileptic,Seizure, Olfactory,Seizure, Partial,Seizure, Sensory,Seizure, Single,Seizure, Somatosensory,Seizure, Tonic,Seizure, Tonic Clonic,Seizure, Tonic-Clonic,Seizure, Vertiginous,Seizure, Vestibular,Seizure, Visual,Seizures, Generalized Tonic-Clonic,Seizures, Nonepileptic,Sensory Seizure,Sensory Seizures,Single Seizures,Somatosensory Seizure,Somatosensory Seizures,Tonic Clonic Seizures,Tonic-Clonic Seizure, Generalized,Tonic-Clonic Seizures, Generalized,Vertiginous Seizure,Vertiginous Seizures,Vestibular Seizure,Vestibular Seizures,Visual Seizure,Visual Seizures