Summary
The muscarinic acetylcholine receptor was solubilized from rat brain cortex by the zwitter-ionic detergent, 3-((3-cholamidopropyl)dimethylamino)1-propane sulfonate (CHAPS). The supernatant, after centrifugation at 100,000 × g, was shown to contain molecules with binding sites for both3H-pirenzepine (3H-PZ) and3H-(-) quinuclidinyl benzilate (3H-QNB). Maximum binding values for3H-PZ and3H-QNB binding to solubilized receptors were approximately 176±24 pmol/g and 370±53 pmol/g of protein, respectively. The Kd values for3H-PZ and3H-QNB binding to solubilized receptors were 27±6.3nM and 0.17±0.03 nM, respectively. The rank order of potencies of muscarinic drugs, in terms of their ability to inhibit binding of either3H-PZ or3H-QNB, was atropine > pirenzepine > oxotremorine > carabachol. Pirenzepine inhibited3H-QNB binding with a Hill coefficient of 0.77, but inhibited3H-PZ with a Hill coefficient of 0.94. Hill coefficients for agonists were less than 1. These findings indicate that muscarinic receptors solubilized from rat brain cortex retain their abilities to interact selectively with muscarinic receptor agonists and antagonists.
Similar content being viewed by others
References
Baron B, Gavish M, Sokolovsky M (1985) Heterogeneity of solubilized muscarinic cholinergic receptors: Binding and hydrodynamic properties. Arch Biochem Biophys 249: 281–296
Berrie CP, Birdsall NJM, Hulme EC, Keen M, Stockton JM (1985) Solubilization and characterization of high and low affinity pirenzepine binding sites from rat cerebral cortex. Br J Pharmacol 85: 697–703
Birdsall NJM, Burgen ASV, Hulme EC (1978) The binding of agonists to brain muscarinic receptors. Mol Pharmacol 14: 723–736
Birdsall NJM, Burgen ASV, Hulme EC (1979) A study of the muscarinic receptor by gel electrophoresis. Br J Pharmacol 66: 337–342
Birdsall NJM, Hulme EC (1983) Muscarinic receptor subclasses. Trends Pharmacol Sci 4: 459–463
Bruns RF, Lawson-Wendling K, Pugsley TA (1983) A rapid filtration assay for soluble receptor using polyethyleneimine-treated filters. Anal Biochem 132: 74–81
Carson S (1982) Cholate-salt solubilization of bovine brain muscarinic receptors. Biochem Pharmacol 31: 1806–1809
Gavish M, Sokolovsky M (1982) Solubilization of muscarinic acetylcholine receptor by Zwitter ionic detergent from rat brain cortex. Biochem Biophys Res Commun 109: 819–824
Goyal RK, Rattan S (1978) Neurohormonal, hormonal and drug receptors for the lower esophagal sphincter. Prog Gastroenterol 74: 598–619
Hammer R, Berrie CP, Birdsall NJM, Burgen ASV, Hulme EC (1980) Pirenzepine distinguishes between different subclasses of muscarinic receptors. Nature 283: 90–92
Hammer R, Giachetti A (1983) Muscarinic receptor subtypes: M1 and M2 biochemical and functional characterization. Life Sci 31: 2991–2998
Harden TK, Meeker RB, Martin MW (1983) Interaction of a radiolabelled agonist with cardiac muscarinic cholinergic receptors. J Pharmacol Exp Ther 227: 570–577
Hjemeland LM (1980) A non denaturing Zwitterionic detergent for membrane biochemistry: design and synthesis. Proc Natl Acad Sci USA, 77: 6368–6370
Lowry OH, Rosebrough NJ, Farr AL, Randal RJ (1951) Protein measurement with the folin phenol reagent. J Biol Chem 193: 265–275
Luthin GR, Wolfe BB (1984) Comparison of3H-pirenzepine and3H-quinuclidinylbenzilate binding to muscarinic cholinergic receptors in rat brain. J Pharmacol Exp Ther 228: 648–655
Luthin GR, Wolfe BB (1985) Characterization of (3H)pirenzepine binding to muscarinic cholinergic receptors solubilized from rat brain. J Pharmacol Exp Ther 234: 37–44
Regan JW, Roeske WR, Malick JB, Yamamura SH, Yamamura HI (1981) Gamma aminobutyric acid enhancement of CL 218, 872 affinity and evidence of benzodiazepine receptor heterogenrity. Mol Pharmacol 20: 477–483
Roeske WR, Venter JC (1984) The differential loss of3H-pirenzepine vs3H(−) quinuclidinylbenzilate binding to soluble rat brain muscarinic receptors indicates that pirenzepine binds to an allosteric state of the muscarinic receptor. Biochem Biophys Res Commun 118: 950–957
Potter LT, Flynn DD, Hanchett HE, Kalinoski DL, Luber-Narod J, Mash DC (1984) Independent M1 and M2 receptors: ligands, autoradiography and functions. Trends Pharmacol Sci [Suppl]: 22–31
Watson M, Roeske WR, Yamamura HI (1982)3H-pirenzepine selectivity identifies a high affinity population of muscarinic cholinergic receptors in the rat cerebral cortex. Life Sci 31: 2019–2023
Watson M, Yamamura HI, Roeske WR (1983) A unique regulatory profile and regional distribution of3H-pirenzepine binding in the rat provide evidence for distinct M1 and M2 muscarinic receptor subtypes. Life Sci 32: 3001–3011
Watson M, Roeske WR, Yamamura HI (1986)3H-Pirenzepine and (−)-3H-quinuclidinyl benzilate binding to rat cerebral cortical and cardiac muscarinic cholinergic sites. II. Characterization and regulation of antagonist binding to putative muscarinic subtypes. J Pharmacol Exp Ther 237: 419–427
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Adem, A., Sabbagh, M. & Nordberg, A. Characterization of agonist and antagonist binding to muscarinic cholinergic receptors solubilized from rat cerebral cortex. J. Neural Transmission 72, 11–18 (1988). https://doi.org/10.1007/BF01244628
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01244628