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. 1993 Jun;109(2):344–352. doi: 10.1111/j.1476-5381.1993.tb13576.x

Characterization of propranolol-resistant (-)-[125I]-cyanopindolol binding sites in rat soleus muscle.

S J Roberts 1, P Molenaar 1, R J Summers 1
PMCID: PMC2175712  PMID: 8102926

Abstract

1. The characteristics of a propranolol-resistant (-)-[125I]-cyanopindolol (CYP) binding site in rat soleus muscle were determined. 2. Saturation studies performed on homogenates of rat soleus muscle showed two phases of (-)-[125I]-CYP binding, a high affinity site (KD1 30.5 +/- 16.3 pM, Bmax 9.4 +/- 1.38 fmol mg-1 protein) and a lower affinity site (KD2 522.5 +/- 29.1 pM, Bmax 62.19 +/- 11.76 fmol mg-1 protein, n = 4). 3. In rat soleus muscle homogenates labelled with (-)-[125I]-CYP (500 pM), (-)-propranolol competition curves were biphasic with pKD values of 8.30 +/- 0.19, and 5.33 +/- 0.08, n = 7. 4. Competition between (-)-[125I]-CYP (500 pM) and (+/-)-tertatolol, (+/-)-nadolol, (+/-)-alprenolol, (+/-)-CYP, and (-) and (+)-pindolol showed that these compounds competed for binding at the propranolol-resistant site with affinities lower than those displayed at typical beta-adrenoceptors. The atypical beta-adrenoceptor agonists BRL 37344, SR58611A and ICI D7114 and the partial agonist (+/-)-CGP 12177 also competed for (-)-[125I]-CYP binding. 5. Stereoselectivity was demonstrated for the stereoisomers of alprenolol and tertalolol. The (-)-isomers of alprenolol and tertalolol had higher affinity than their corresponding (+)-isomers (3.1 and 2.6 fold respectively). These low stereoselectivity values are a characteristic of atypical beta-adrenoceptors. 6. The beta-adrenoceptor agonists, (-)-adrenaline, (-)-isoprenaline and (-)-noradrenaline, all showed lower affinity than the atypical beta-adrenoceptor agonists and competition curves appeared biphasic in nature.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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