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R. M. Wallace and J. M. Young, “Temperature Dependence of the Binding of [3H]Mepyramine and Related Compounds to the Histamine H1 Receptor,” Molecular Pharmacology, Vol. 23, No. 1, 1983, pp. 60-66.

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• TITLE: Evidence for a Non-β2-Adrenoceptor Binding Site in Human Lung Tissue for a Subset of β2-Adrenoceptor Agonists

  AUTHORS: Robert J. Slack

  KEYWORDS: β2-Adrenoceptor; Radioligand Binding; Human Lung; Tissue Binding Site

  JOURNAL NAME: Pharmacology & Pharmacy, Vol.5 No.1, January 9, 2014

  ABSTRACT: The aim of this study was to compare the binding profile of a range of β2-adrenoceptor (β2-AR) agonists and antagonists in human lung tissue. Radioligand saturation and competition binding experiments were performed by filtration with a β2-AR antagonist ([3H]propranolol) or agonist ([3H]vilanterol) radioligand and membrane fragments generated from lung parenchyma in the presence of 100 μM guanosine 5’-[β,γ-imido]triphosphate (Gpp(NH)p). In membranes prepared from human lung parenchyma, carmoterol, formoterol, ICI118551, propranolol and salbutamol resulted in inhibition of [3H]vilanterol binding to levels that were significantly different from indacaterol, salmeterol and vilanterol (ANOVA, Bonferroni post-test, P 3H]vilanterol binding to levels that were not significantly different from vilanterol (ANOVA, Bonferroni post-test, P > 0.05). Indacaterol, salmeterol and vilanterol resulted in full inhibition of [3H]propranolol binding to levels not significantly different from ICI118551 (ANOVA, Bonferroni post-test, P > 0.05). Indacaterol, salmeterol and vilanterol bind to an additional site in human lung parenchyma membranes that is distinct from the β2-AR.