alexa Beta-adrenergic receptor subtypes mediating lipolysis in porcine adipocytes. Studies with BRL-37344, a putative beta3-adrenergic agonist.
Physicaltherapy & Rehabilitation

Physicaltherapy & Rehabilitation

Journal of Sports Medicine & Doping Studies

Author(s): Mills S

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Abstract The beta3-selective adrenergic receptor ligand BRL 37344 (BRL) was used to differentiate the presence and functional role of beta-adrenergic receptor (betaAR) subtypes in pig tissues. BRL did not stimulate adenylyl cyclase in membrane preparations or increase lipolysis from pig adipocytes. In contrast to some species, BRL appears to be a poor agonist for the pig betaAR and is not a useful betaAR ligand. Based on displacement of [3H]dihydroalprenolol binding, BRL exhibited a 100-fold selectivity for pig betaAR subtypes in adipose and skeletal muscle membranes. The high affinity site was proposed to be the beta2AR. When used as an antagonist, BRL blockade of the high affinity site did not interfere with isoproterenol-stimulated lipolysis but did inhibit adenylyl cyclase activation. Results indicate that the high affinity betaAR (betaAR) is not linked to lipolysis, possibly due to intracellular compartmentalization. Therefore, betaAR subtypes may have function-specific effects.
This article was published in Comp Biochem Physiol C Toxicol Pharmacol and referenced in Journal of Sports Medicine & Doping Studies

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