l-Carnitine: therapeutic strategy for metabolic encephalopathy |
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Authors: | C.S. Kim D.R. Dorgan C.R. Roe |
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Affiliation: | 1. Biological Sciences Research Center, University of North Carolina of Medicine, USA;2. Department of Neurology, University of North Carolina School of Medicine, USA;3. Dental Research Center, School of Dentistry, University of North Carolina, Chapel Hill, NY 27514, USA;4. Division of Metabolism and Genetics, Department of Pediatrics, Duke University Medical Center, Durham, NC 27710 U.S.A. |
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Abstract: | The effects of 4-aminopyridine (4-AP) on membrane electrical properties and synaptic transmission in neurons of the isolated rabbit superior cervical ganglion were investigated. 4-AP (0.03-0.1 mM) increased the amplitude of the fast excitatory postsynaptic potential (f-EPSP) without affecting appreciably either the acetylcholine (ACh) depolarization induced by iontophoresis of ACh or the passive and active membrane properties of the neurons. At concentrations of 1-5 mM, 4-AP reversibly depressed the amplitude of the f-EPSP as well as the ACh depolarization; a slight to moderate prolongation of the action potential duration was observed. In addition to the effects on evoked synaptic potentials, 4-AP induced spontaneous discharges which were abolished reversibly by curare, low Ca solution or Co. The results indicate that 4-AP at low concentrations facilitated evoked as well as spontaneous release of ACh by a presynaptic mechanism, whereas at higher concentrations it exerted a curare-like effect on the postsynaptic membrane. |
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Keywords: | carnitine octanoate octanoylcarnitine metabolic encephalopathy choroid plexus 5-hydroxyindoleacetic acid ultrastructure |
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