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  • 1
    ISSN: 1420-908X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The release of the putative neurotransmitter histamine (HA) from rat brain cortex slices is under negative feedback control by an HA autoreceptor. This autoreceptor has been postulated to belong to a new class of HA receptors, H3. To verify this hypothesis we have developed an assay using superfused rat brain cortex slices. The HA transmitter pool is labelled by incubation of the slices with the precursor3H-histidine;3H-HA is estimated after separation by column chromatography. Release of HA was found both after K+-induced depolarization and electrical field stimulation. The latter resulted in higher and more reproducible HA release. Electrically induced HA release could be fully inhibited in a concentration dependent way by exogenous HA in the superfusion buffer. Nα-alkylated histamines also showed agonistic activity. The action of exogenous HA was totally blocked by the potent H2 agonist impromidine and some of its analogues.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Pharmacy world & science 17 (1995), S. 120-125 
    ISSN: 1573-739X
    Schlagwort(e): Alcohols ; Chemical synthesis ; Nitrates ; Pharmacology ; Structure-activity relationship ; Vasodilator agents
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract New organic nitrate esters, derived from structurally different (cyclo)aliphatic templates, were synthesized and pharmacologically investigated. Theirin vitro vascular smooth muscle relaxing activities and, occasionally,in vivo haemodynamic profiles were studied and compared to those of the clinically important nitrates, glyceryl trinitrate, isosorbide dinitrate and isosorbide-5-mononitrate. A number of compounds appeared to be even more potent than glyceryl trinitrate. Qualitative structure-activity relationships within the series of new compounds are discussed. In flexiblen-alkylene dinitrates, lipophilicity as well as chain length appears to affectin vitro activity. In semi-rigid cyclohexylene dinitrates, the number of atoms between and the configuration of the nitrate groups may play an important role. Finally, in cycloalkylene mononitrates neither the number of ring carbon atoms nor the lipophilicity clearly affects thein vitro activity. It is suggested that, apart from a limited involvement of compound lipophilicity, other factors such as differences in enzymatic conversion to a common putative bioactive species, nitric oxide, are responsible for the observed differences in activity.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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