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. 1993 Aug;109(4):1157–1163. doi: 10.1111/j.1476-5381.1993.tb13743.x

Ligand binding properties of putative beta 3-adrenoceptors compared in brown adipose tissue and in skeletal muscle membranes.

M N Sillence 1, N G Moore 1, G G Pegg 1, D B Lindsay 1
PMCID: PMC2175755  PMID: 8104645

Abstract

1. The beta-adrenoceptor population was characterized in membrane preparations from rat brown adipose tissue (BAT) and from soleus muscle by use of the radioligand [125I]-iodocyanopindolol ([125I]-ICYP). In addition, atypical binding sites for [125I]-ICYP found in both tissues were examined, and the relationship between these sites and the putative rat beta 3-adrenoceptor is discussed. 2. It was established that BAT membranes host a mixed population of beta 1- and beta 2-adrenoceptors. Of these two sites, 55% showed a high affinity for the beta 1-selective ligand CGP 20712A (pK 8.5), and 45% showed a high affinity for the beta 2-selective antagonist ICI 118551 (pK 8.6). Soleus muscle membranes were found to host a population of beta 2-adrenoceptors, characterized by a high affinity for ICI 118551 (pK 9.1), but beta 1-adrenoceptors could not be detected in this preparation. 5-Hydroxytryptamine receptors were not detected in either preparation. 3. In addition to beta 1- and beta 2-adrenoceptors, atypical binding sites were identified in both tissues using high concentrations of radioligand (0.5-0.6 nM) and in the presence of 1 microM (-)-propranolol. The atypical sites were abundant, representing 80 and 81% of the total [125I]-ICYP binding sites in BAT and soleus muscle respectively. When the pK values for 11 ligands were compared, the correlation coefficient for atypical sites in BAT and soleus muscle was 0.94.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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