15 research outputs found
Familial Hemiplegic Migraine and Spreading Depression
How to Cite This Article: Kazemi H, Speckmann EJ, Gorji A. Familial Hemiplegic Migraine and Spreading Depression. Iran J Child Neurol. 2014 Summer;8(3): 6-11. AbstractObjectiveFamilial hemiplegic migraine (FHM) is an autosomal dominantly inherited subtype of migraine with aura, characterized by transient neurological signs and symptoms. Typical hemiplegic migraine attacks start in the first or second decade of life. Some patients with FHM suffer from daily recurrent attacks since childhood. Results from extensive studies of cellular and animal models have indicated that gene mutations in FHM increase neuronal excitability and reduce the threshold for spreading depression (SD). SD is a transient wave of profound neuronal and glial depolarization that slowly propagates throughout the brain tissue and is characterized by a high amplitude negative DC shift. After induction of SD, S218L mutant mice exhibited neurological signs highly reminiscent of clinical attacks in FHM type 1 patients carrying this mutation. FHM1 with ataxia is attributable to specific mutations that differ from mutations that cause pure FHM1 and have peculiar consequences on cerebellar Cav2.1 currents that lead to profound Purkinje cell dysfunction and neuronal loss with atrophy. SD in juvenile rats produced neuronal injury and death. Hormonal factors involved in FHM affect SD initiation and propagation. The data identify SD as a possible target of treatment of FHM. In addition, FHM is a useful model to explore the mechanisms of more common types of migraine. ReferencesRussell MB, Ducros A. Sporadic and familial hemiplegic migraine: pathophysiological mechanisms, clinical characteristics, diagnosis, and management. 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Neuroprotection by 21-aminosteroids: insights from latencies of anoxic terminal negativity in hippocampus slices of guinea pig
ATPase N-ethylmaleimide-sensitive Fusion Protein: A Novel Key Player for Causing Spontaneous Network Excitation in Human Temporal Lobe Epilepsy.
The molecular basis for onset, maintenance and propagation of excitation along neuronal networks in epilepsy is still poorly understood. Besides different neurotransmitter receptors that control signal transfer at the synapse, one key regulator involved in all of these processes is the ATPase N-ethylmaleimide-sensitive fusion protein (NSF). Therefore, we analyzed receptor subunits and NSF levels in tissues from the medial temporal gyrus (MTG) of patients with pharmaco-resistant focal temporal lobe epilepsy resected during epilepsy surgery and autopsy controls. The resected tissues were further characterized by field potential recordings into tissues with and without spontaneous sharp wave activity. We detected increased levels of NSF, NMDA 1.1, 2A and GABAAÎł2 receptor subunits associated with spontaneous sharp wave spiking activity. We further identified correlations between NSF, AMPA receptor subunit, metabotropic glutamate receptor and adenosine 1 receptor levels in the spontaneous sharp wave spiking tissues. Our findings suggest that NSF plays a key role in controlling spontaneous network excitation in epilepsy by two mechanisms of action: (1) directly via controlling transmitter release at the presynaptic side, and (2) indirectly via altering the function of possible receptor crosstalk and directing/integrating specific receptor compounds through/into the postsynaptic membrane
Directional spread of activity in synaptic networks of the human lateral amygdala.
Spontaneous epileptiform activity has previously been observed in lateral amygdala (LA) slices derived from patients with intractable-temporal lobe epilepsy. The present study aimed to characterize intranuclear LA synaptic connectivity and to test the hypothesis that differences in the spread of flow of neuronal activity may relate to spontaneous epileptiform activity occurrence. Electrical activity was evoked through electrical microstimulation in acute human brain slices containing the LA, signals were recorded as local field potentials combined with fast optical imaging of voltage-sensitive dye fluorescence. Sites of stimulation and recording were systematically varied. Following recordings, slices were anatomically reconstructed using two-dimensional unitary slices as a reference for coronal and parasagittal planes. Local spatial patterns and spread of activity were assessed by incorporating the coordinates of electrical and optical recording sites into the respective unitary slice. A preferential directional spread of evoked electrical signals was observed from ventral to dorsal, rostral to caudal and medial to lateral regions in the LA. No differences in spread of evoked activity were observed between spontaneously and non-spontaneously active LA slices, i.e. basic properties of evoked synaptic responses were similar in the two functional types of LA slices, including input-output relationship, and paired-pulse depression. These results indicate a directed propagation of synaptic signals within the human LA in spontaneously active epileptic slices. We suggest that the lack of differences in local and in systemic information processing has to be found in confined epileptiform circuits within the amygdala likely involving well-known 'epileptic neurons'