Molecular cloning and functional expression of the guinea pig alpha(1a)-adrenoceptor.

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Gonzalez-Espinosa C, Romero-Avila MT, Mora-Rodriguez DM, Gonzalez-Espinosa D, Garcia-Sainz JA

Molecular cloning and functional expression of the guinea pig alpha(1a)-adrenoceptor.

Eur J Pharmacol. 2001 Aug 31;426(3):147-55.

PubMed ID

11527538 [ View in PubMed

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Abstract

In the present paper, the cloning and expression of the guinea pig alpha(1A)-adrenoceptor is presented. The nucleotide sequence had an open reading frame of 1401 bp that encoded a 466 amino-acid protein with an estimated molecular mass of approximately 51.5 kDa. When the clone was expressed in Cos-1 cells, specific high-affinity binding of [(3)H]prazosin and [(3)H]tamsulosin was observed. Chloroethylclonidine treatment of membranes slightly decreased the total binding with both radioligands. Binding competition experiments using [(3)H]tamsulosin showed the following potency order: (a) for agonists: oxymetazoline >>epinephrine>norepinephrine>methoxamine, and (b) for antagonists: prazosin> or 5-methyl-urapidil=benoxathian>phentolamine>>BMY 7378 (8-[2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl]-8-azaspiro[4,5]decane-7,9-dione). Photoaffinity labeling using [(125)I-aryl]azido-prazosin revealed a major broad band with a molecular mass between 70 and 80 kDa. The receptor was functional, as evidenced by an epinephrine-increased production of [(3)H]inositol phosphates that was blocked by prazosin.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Oxymetazoline	Alpha-1A adrenergic receptor	Protein	Humans	Yes	Partial agonist	Details