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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 639 (1991), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 277 (1979), S. 32-36 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The mechanism of β-adrenergic relaxation was investigated in isolated smooth muscle cells. β-adrenergic agents stimulate cyclic AMP-dependent phosphorylation, enhance Na+/K+ transport and induce relaxation. The stimulation of ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 339 (1989), S. 145-151 
    ISSN: 1432-1912
    Keywords: Smooth muscle ; Muscarinic receptors ; G Proteins ; Selective antagonists
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The interaction of cholinergic agonists and antagonists with smooth muscle muscarinic receptors has been investigated by measurement of displacement of the muscarinic antagonist [3H]QNB (quinuclidinyl benzilate) in membranes prepared from toad stomach. The binding of [3H]QNB was saturable, reversible and of high affinity (K D = 423 pM). The muscarinic receptor subtypes present in gastric smooth muscle were classified by determining the relative affinities for the selective antagonists pirenzepine (M1), AF-DX 116 (M2) and 4-DAMP (M3). The results from these studies indicate the presence of a heterogeneous population of muscarinic receptor subtypes, with a majority (88%) exhibiting characteristics of M3 receptors and a much smaller population (12%) exhibiting characteristics of M2 receptors. The binding curve for the displacement of [3H]QNB binding by the agonist oxotremorine was complex and was consistent with presence of two affinity states: 24% of the receptors had a high affinity (K D = 4.7 nM) for oxotremorine and 76% displayed nearly a 1,000-fold lower affinity (K D = 4.4 μM). When oxotremorine displacement of [3H]QNB binding was determined in the presence GTPγS, high affinity binding was abolished, indicating that high affinity agonist binding may represent receptors coupled to G proteins. Moreover, pertussis toxin pretreatment of membranes also abolished high affinity agonist binding, indicating that the muscarinic receptors are coupled to pertussis toxin-sensitive G proteins. Reaction of smooth muscle membranes with pertussis toxin in the presence [32P]NAD caused the [32P]-labelling of a 40 kD protein that may represent the α subunit(s) of G proteins that are known to be NAD-ribosylated by the toxin. We conclude that both M3 and M2 receptors may be coupled to G proteins in a pertussis-sensitive manner.
    Type of Medium: Electronic Resource
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