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L J Way

Publications and source records attributed to L J Way.

8 recordsLinked to original sources
PubMed1993

Pairing of pre- and postsynaptic activities in hippocampal CA1 neurons induces long-term modifications of NMDA receptor-mediated synaptic potential.

An in vitro slice preparation of rat hippocampus was used to study the long-term modifications of pharmacologically isolated N-methyl-D-aspartate (NMDA) receptor-mediated excitatory postsynaptic potential (EPSPNMDA). Intracellular recordings were made from CA1 pyramidal cells in the presence of 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX; 10 microM) and picrotoxin (50 microM) which block non-NMDA and GABAA receptors, respectively. Pairing of low-frequency EPSPNMDA with postsynaptic depolarization induced a long-term depression (LTD) of EPSPNMDA. The maximal reduction of EPSPNMDA amplitude amounted to 81.3% of the control 1 min after the pairing. When low-frequency synaptic stimulation was paired with strong postsynaptic depolarization, a long-term potentiation (LTP) of EPSPNMDA could be induced. These results suggest that the induction of long-term modifications of EPSPNMDA has at least a postsynaptic component.

6-Cyano-7-nitroquinoxaline-2,3-dione↗
PubMed1993

Long-term enhancement of EPSP and NMDA receptor-mediated synaptic transmission in the amygdala.

An in vitro slice preparation of rat amygdala was used to study the long-term modifications of synaptic efficacy following high-frequency stimulation of the ventral endopyriform nucleus. Delivery of brief tetani to the afferent fibers led to a long-term potentiation (LTP) of the amplitude and the initial slope of excitatory postsynaptic potential (EPSP). Pretreatment the slices with DL-2-amino-5-phosphonovaleate (DL-APV, 50 microM) blocked the induction of LTP, indicating that N-methyl-D-aspartate (NMDA) receptor activation is required for induction. NMDA receptor-mediated component of synaptic response (EPSPNMDA) was isolated by application of a solution containing 6-cyano-7-nitro-quinoxaline-2,3-dione (CNQX, 10 microM) and bicuculline (20 microM). Tetanic stimulation led to a lasting potentiation of the EPSPNMDA. These results suggest that brief repetitive stimulation of afferent pathway produces forms of LTP that share many properties of LTP seen in the CA1 region of the hippocampus.

2-Amino-5-phosphonovalerate↗
PubMed1991

Clinical and electrophysiological assessment of cerebral malaria.

From January 1980 to December 1990, six cases of malaria were observed; three cases were caused by plasmodium (P.) vivax and three by P. falciparum. Following a malaria episode, two cases (33.3%), developed cerebral malaria. Both of them were infected by P. falciparum. Neurological and electrodiagnostic investigations were scheduled throughout their clinical course. The first case manifested as a grand mal seizure, followed by myoclonic jerk and a comatous state. A suppression burst EEG observed before anti-malarial therapy was initiated. In the second case, a manifestation of encephalo-myelo-neuropathy was confirmed clinically and electrophysiologically. Although both cases occurred suddenly and were extremely severe, early anti-malarial therapy resulted in good responses without sequelae. The complete reversibility of the pathological event depends on early recognition and comprehensive therapy. Further, electrophysiological assessment is recommended for the detection of regional involvement in cerebral malaria.

Adult↗
PubMed1990

Neuro-Behçet's disease: report of three cases with a review of the literature.

We report three cases of neuro-Behçet's disease, including one woman and two men (age range 52-56 years), who displayed symptoms of high fever, headache and confusion. The EEG showed generalized slowing in two cases, and periodic lateralized epileptiform discharges in one. Brain CT scans from two patients revealed cortical atrophy with multiple low density areas in one case, and focal contrast enhancement in the other. The CSF study revealed pleocytosis in all cases, but only one showed lymphophagocytosis. All of the patients responded dramatically to steroid therapy, although administration of the drug was somewhat delayed in two cases, during which initial management was aimed at the CNS infection of bacterial origin. Recurrent attacks of confusion or mental dullness were found in two patients, and high cortical dysfunction persisted on follow-up for some time. The clinical manifestations, laboratory findings, and neuroradiological features of neuro-Behçet's disease in the reported cases are reviewed.

Behcet Syndrome↗