Summary
A radioreceptor assay (RRA) recently developed in this laboratory for beta-adrenoceptor antagonists in plasma was evaluated in normal volunteers and compared with a radioimmunoassay (RIA) for propranolol. The RRA depends upon the ability of beta-adrenoceptor antagonists to compete with a radiolabelled ligand for beta-adrenoceptor binding sites on lung membranes. Unlike other assays, it measures biologically active drugs including active metabolites of the parent compound. In volunteers given a single oral dose of (±)-propranolol, considerable differences between the two assay methods were demonstrated. In other experiments this difference was shown to relate to the RIA's sensitivity to the inactive (+)-isomer of propranolol and possibly to inactive metabolites. The facility of the RRA in measuring plasma levels of several other non-selective beta-adrenoceptor antagonists was also demonstrated. By employing (−)-propranolol as the standard in the RRA, all of these drugs can be directly compared with a single and relatively simple assay technique.
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References
Barnett DB, Rugg E, Nahorski SR (1978) Direct evidence for two types of beta-adrenoceptor binding sites in lung tissue. Nature 273:166–167
Bylund DB, Snyder SH (1976) β-Adrenergic receptor binding in membrane preparations from mammalian brain. Mol Pharmacol 12:568–580
Creese I, Snyder SH (1977) A simple and sensitive radioreceptor assay for antischizophrenic drugs in blood. Nature 270:180–182
Innis RB, Bylund DB, Snyder SH (1978) A simple and sensitive and specific radioreceptor assay for β-adrenergic antagonist drugs. Life Sci 23:2031–2038
Johnsson G, Regardh CG (1976) Clinical pharmacokinetics of β-adrenoceptor blockings drugs. Clin Pharmacokinet 1:233–263
Kates RE, Jones CL (1977) Rapid GLC determination of propranolol in human plasma samples. J Pharm Sci 66:1490–1496
Kawashima K, Levy A, Spector S (1976) Stereospecific radioimmunoassay for propranolol isomers. J Pharmacol Exp Ther 196:517–524
Nahorski SR (1978) Biochemical consequences of adrenoceptor stimulation. In: Szabadi E, Bradshaw CM, Bevan P (eds) Recent advances in the pharmacology of adrenoceptors. Elsevier/North-Holland Biomedical Press, Amsterdam, pp 163–166
Nahorski SR (1978) Heterogeneity of cerebral beta-adrenoceptor binding sites in various vertebrate species. Eur J Pharmacol 51:199–209
Nahorski SR, Batta MI, Barnett DB (1978) Measurement of β-adrenoceptor antagonists in biological fluids using a radioreceptor assay. Eur J Pharmacol 52:393–396
Routledge PA, Shand DG (1979) Clinical pharmacokinetics of propranolol. Clin Pharmacokinet 4:73–90
Rugg EL, Barnett DB, Nahorski SR (1978) Co-existence of beta1 and beta2 adrenoceptors in mammalian lung: evidence from direct binding studies. Mol Pharmacol 14:996–1005
Shand DG, Nuckolls EM, Dates JA (1970) Plasma propranolol levels in adults with observations in four children. Clin Pharmacol Ther 11:112–120
Walle T (1974) GLC determination of propranolol, other β-blocking drugs and metabolites in biological fluids and tissues. J Pharm Sci 63:1885–1892
Walle T, Conradi EC, Walle UK, Gaffney TE (1978) O-Methylated catechol-like metabolites of propranolol in man. Drug Metab Dispos 6:481–487
Wood AJ, Carr K, Vestal RE, Belcher S, Wilkinson GR, Shand DG (1978) Direct measurement of propranolol bioavailability during accumulation to steady state. Br Clin Pharmacol 6:345–350
Yamamura HI, Enna SJ, Kuhar MJ (1978) Neurotransmitter receptor binding. Raven Press, New York
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Barnett, D.B., Batta, M., Davies, B. et al. Evaluation of a radioreceptor assay for beta-adrenoceptor antagonists in plasma. Eur J Clin Pharmacol 17, 349–354 (1980). https://doi.org/10.1007/BF00558447
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DOI: https://doi.org/10.1007/BF00558447