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  • 1
    Digitale Medien
    Digitale Medien
    Effect of dalargin, a synthetic leu-enkephalin analogue on synaptic transmission in the Lorenzini ampullae of rays (1993)
    Springer
    Neurophysiology 25 (1993), S. 13-15 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Effects of dalargin, a synthetic leu-enkephalin analogue and its antagonist naloxone on synaptic transmission in afferent synapses of ray electroreceptors were investigated using an isolated preparation of Lorenzini ampullae from Black sea rays. It was shown that dalargin (10−6–10−10 mole liter) both decreased background activity and evoked activity of an afferent fiber in a dose-dependent manner. Naloxone (10−5 mole/liter) also inhibited afferent impulsation and completely blocked responses of the Lorenzini ampullae to dalargin application. L-glutamate-induced excitatory responses were reduced in the presence of dalargin. It is suggested that the modulatory action of dalargin on glutamatergic synaptic transmission in the Lorenzini ampullae is exerted via specific opiate receptors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01053627
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  • 2
    Digitale Medien
    Digitale Medien
    Activity of central neurons of the electroreceptor system ofGlyptosternum reticulatum (1983)
    Springer
    Neurophysiology 15 (1983), S. 95-100 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Two types of electroreceptive neurons — tonic and phasic — were found in acute experiments with extracellular recording of unit activity from the lateral lobes of the medulla in the Turkestan catfishGlyptosternum reticulatum. Tonic neurons were more sensitive to the potential gradient in water (the threshold for most neurons was 1–6 µV/cm) than phasic neurons, they possessed spontaneous activity (mean frequency 4–10 spikes/sec), and their response characteristics depended significantly on the intensity and duration of stimulation. Phasic neurons had no spontaneous activity; their sensitivity was about one order of magnitude lower than that of the tonic neurons, and the response was independent of the parameters of the stimuli. The probable mechanisms of differentiation of neurons into two types, with a possible link with the characteristics of the receptor formations or with the functional organization of the corresponding brain centers, are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01060119
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  • 3
    Digitale Medien
    Digitale Medien
    Electrophysiological study of central projections of ampullae of lorenzini in skates (1983)
    Springer
    Neurophysiology 15 (1983), S. 451-457 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The topical representation of individual electroreceptor organs (ampullae of Lorenzini) or groups of them on brain neurons of the thorny skate was investigated. The electroreceptor system was shown to be represented in the anterior lateral lobes of the medulla, the caudal portion of the auricles of the cerebellum, and the midbrain. In the medulla zones of representation of electroreceptors and mechanoreceptors are segregated. No precise somatotopic organization of electroreceptor representation was found in the anterior lateral lobe or in the auricles of the cerebellum. Connections of midbrain neurons with receptors on both ipsilateral and contralateral sides of the body were demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01066120
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  • 4
    Digitale Medien
    Digitale Medien
    Effects of some agonists of excitatory amino acids on synaptic transmission in the skate electroreceptors (ampullae of Lorenzini) (1988)
    Springer
    Neurophysiology 20 (1988), S. 330-335 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The effects on synaptic transmission of blockers of amino acids at postsynaptic receptors were investigated by means of external perfusion of the basal membrane of electroreceptor cells in ampullae of Lorenzini and by recording of spike activity from individual nerve fibers in the skateRaja clavata: glutamic acid diethyl ester (DEE-GLU), glutamic acid dimethyl ester (DME-GLU), D-α-aminoadipic acid (DAA), kynurenic acid (KYN), and cis-2,3-piperidine dicarboxylic acid (PDA). The most effective blocker was found to be DEE-GLU, producing reversible blockade of postsynaptic amino acid response. It was found that DAA did not change synaptic transmission in the electroreceptors, while PDA largely affected response produced by applying L-aspartic acid (L-ASP); KYN affected response produced by L-glutamic acid (L-GLU). It is deduced that L-GLU and L-ASP are the most effective agonists at the afferent synapse of ampullae of Lorenzini and that their excitatory effect is produced by activating quisqualate receptors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02198440
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  • 5
    Digitale Medien
    Digitale Medien
    Effects of quisqualate, N-methyl-D-aspartate, and some amino acid antagonists on synaptic transmission in ampullae of Lorenzini (1989)
    Springer
    Neurophysiology 21 (1989), S. 116-121 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The effects of quisqualic acid (QA), N-methyl-D-aspartate (NMDA), and a number of NMDA and non-NMDA receptor antagonists on background and induced activity in afferent nerve fibers were investigated in skates by means of bath application to the basal membrane of electroreceptors (ampullae of Lorenzini). Perfusion with physiological saline containing QA or NMDA (minimum concentrations required: 10−8 and 10−5 M respectively) was found to exert an excitatory effect on afferent activity. Aminoadipate and aminophosphonobutyrate had no effect on synaptic transmission, which was blocked by aminophosphonovalerate, however. Raising magnesium ion concentration (of 30 mM) led to blockade of NMDA-induced response without changing that produced by QA. Aminophosphonovalerate blocked NMDA response and partially reduced the effects of L-aspartic acid. Glutamyl glycine produced blockade of synaptic transmission. The findings obtained would point to synaptic sensitivity to the action of amino acid agonists (QA and NMDA) in the ampullae of Lorenzini.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01056968
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  • 6
    Digitale Medien
    Digitale Medien
    Some morphological and functional properties of the lateral line system of the dwarf catfish (1975)
    Springer
    Neurophysiology 7 (1975), S. 160-164 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The peripheral and central portions of the lateral line system of the dwarf catfish were studied by morphological and electrophysiological methods. The posterior lateral line nerve, innervating the electro- and mechanoreceptors of the trunk, was shown to consist of poorly myelinated fibers 2–9 µ in diameter. The conduction velocity in this nerve varied from 10 to 15 m/sec. The lateral line nerves end in the medial nucleus of the acoustico-lateral region, which consists of dorsal and medial parts. The former is composed of circular and triangular cells measuring 6–14 µ, the second part by circular cells measuring 4–6 µ. These parts of the medial nucleus are most sharply differentiated in the region of entry of the auditory nerve. Responses to stimulation of the lateral line electro- and mechanoreceptors were recorded over the whole of the acousticolateral region in the caudal-rostral direction. The neurons studied were located at depths of 400–800 µ in the region of the medial nucleus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01062863
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  • 7
    Digitale Medien
    Digitale Medien
    Central representation of the anterior lateral line nerve in the catfish (1981)
    Springer
    Neuroscience and behavioral physiology 11 (1981), S. 505-509 
    Details
    ISSN: 1573-899X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01182806
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  • 8
    Digitale Medien
    Digitale Medien
    Investigation of mechanisms of synaptic transmission in ampullae of Lorenzini in the skate (1981)
    Springer
    Neurophysiology 13 (1981), S. 213-219 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The effect of magnesium ions, L-glutamate (L-GLU), and the diethyl ester of glutamic acid (DEE-GLU) on temperature and electrical sensitivity of the ampullae of Lorenzini in skates was studied by the method of perfusion of the basal membrane of electroreceptor cells and recording spike activity from single nerve fibers. Addition of 10−4–10−5 M L-GLU to the solution was shown to cause an increase in the spontaneous discharge frequency of receptors with low initial level of activity (8–20 spikes/sec) and a decrease in receptors with spontaneous activity of 22–42 spikes/sec. In solution with an increased magnesium ion concentration (15–50 mM) both spontaneous and evoked receptor activity was blocked, Under these conditions the addition of L-GLU to the solution caused partial recovery of spontaneous receptor activity. Reversible blocking of spontaneous and evoked receptor activity was observed in a solution containing 10−4–10−3 M DEE-GLU. It is suggested that L-GLU is the synaptic transmitter in the ampullae of Lorenzini of the skate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01065112
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  • 9
    Digitale Medien
    Digitale Medien
    Effects of glutamic acid diethylester on synaptic transmission in the skate ampullae of Lorenzini (1987)
    Springer
    Neurophysiology 19 (1987), S. 236-239 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The effects on synaptic transmission of glutamic acid diethylester (GDEE), a glutamate receptor blocker, were investigated by recording spike activity from single nerve fibers in the electroreceptor cells of the skate (Raja clavata) ampullae of Lorenzini. It was found that adding GDEE to the bathing medium led to a concentration-dependent reduction in or complete blockade of background and evoked receptor activity; 10−6 M GDEE was the minimum effective concentration. It was also shown that GDEE reversibly blocked postsynaptic response produced by excitatory amino acids: L-glutamate (L-GLU) and L-asparate (L-ASP). Findings suggest the involvement of L-GLU or a related substance in synaptic transmission in the ampullae of Lorenzini.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01056622
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  • 10
    Digitale Medien
    Digitale Medien
    Influence of L-serine-O-phosphate on synaptic transmission in afferent synapses of the ampullae of Lorenzini of skates (1991)
    Springer
    Neurophysiology 23 (1991), S. 279-282 
    Details
    ISSN: 1573-9007
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The method of superfusion of the basal membranes of the ampullae of Lorenzini of skates was used to investigate the influence of L-serine-O-phosphate (SOP) on the background and evoked activity of afferent nerve fibers, as well as on the effects of application of agonists: exciting amino acids — L-glutamate (L-GLU), kainate (KA), quisqualte (Q), and N-methyl-D-aspartate (NMDA). It was found that SOP (threshold concentration 10−7 M) had an inhibiting effect on the background and evoked activity of the nerve fibers; depending on the concentration it decreased the stimulatory effects of L-GLU and NMDA and did not change the responses due to application of KA and Q. The data obtained suggest that the effects of SOP observed in the ampullae of Lorenzini are associated with its interaction with NMDA-type amino acid receptors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01052557
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