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  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 26 (1999), S. 0 
    ISSN: 1600-079X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: We have used the cystic fibrosis transmembrane conductance regulator (CFTR) CI- channel as a model system to study the cAMP signal transduction pathways coupled to the Xenopus melatonin receptor. During forskolin (Fsk) stimulation, melatonin reduced the amplitude of the CFTR currents in oocytes injected with in vitro transcribed cRNAs for the Xenopus melatonin receptor and CFTR. Pertussis toxin (Ptx) treatment eliminated melatonin inhibition of Fsk stimulated CFTR currents. In oocytes injected with cRNA for melatonin receptors, serotonin receptors (5-HT7). and CFTR CI− channels, application of melatonin together with serotonin (5-HT) activated an additional inward current showing potentiation of adenylyl cyclases by melatonin receptors. Subthreshold activation of 5-HT7 receptors was sufficient and necessary to permit activation of CFTR channels by melatonin. Preexposure to melatonin desensitized the melatonin receptor mediated response. Therefore, based on this model system, the effects of melatonin in vivo could be either positive or negative modulation of other neuronal inputs, depending on the mode of adenylyl cyclase stimulation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1573-6903
    Schlagwort(e): Excitotoxicity ; Lathyrism ; NMDA receptor ; strychnine-insensitive glycine receptor ; β-N-oxalyl-α,β-diaminopropanoic acid ; glutamate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Lathyrism is a non-progressive motor neuron disease produced by consumption of the excitatory amino acid, 3-N-oxalyl-L-2,3-diaminopropanoic acid (β-ODAP). To learn more about the mechanisms underlying Lathyrism three structural analogs of β-ODAP were synthesized. Carboxymethyl-α,β-diaminopropanoic acid (CMDAP) evoked inward currents which were antagonized by APV (30 μM), but not by CNQX (10 μM). N-acetyl-α,β-diaminopropanoic acid (ADAP) evoked no detectable ionic currents but potentiated N-methyl-D-aspartate (NMDA)-activated currents. The potentiation of NMDA currents by ADAP was blocked by 7-chlorokynurenic acid. Carboxymethylcysteine (CMC) did not activate any detectable ionic currents. None of the three β-ODAP analogs produced visible symptoms of toxicity in day old chicks when administered for 2–3 consecutive days. Ligand binding studies demonstrated that all the three compounds were effective to in displacing [3H]glutamate. The maximum inhibition was 92% for CMDAP, 61% for ADAP, 65% for CMC and 99% for β-ODAP. These data indicate that analogs of β-ODAP may interact with glutamate receptors without producing neurotoxicity.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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