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The beta-adrenoceptor antagonist (-)-3-[125I]iodocyanopindolol ([125I]ICYP) binds with high affinity and in saturable way to membranes of guinea pig alveolar macrophages. The equilibrium dissociation constant for [125I]ICYP is 24.3 +/- 1.2 pM, and the number of binding sites is 166.3 +/- 13.7 fmol/mg protein (N = 4, +/- SEM). Displacement studies with selective antagonists showed that [125I]ICYP labels beta 2-adrenoceptors on guinea pig alveolar macrophages.

Identification ofβ 2-adrenoceptors on guinea pig alveolar macrophages using (−)-3-[125I]iodocyanopindolol