Molecular cloning, expression and characterization of cDNA encoding a mouse alpha1a-adrenoceptor

Area of Science:

• Molecular Biology
• Pharmacology
• Neuroscience

Background:

• Alpha1a-adrenoceptors play crucial roles in regulating various physiological processes.
• Understanding the specific characteristics of mouse alpha1a-adrenoceptors is essential for comparative studies and drug development.

Purpose of the Study:

• To clone, express, and characterize the mouse alpha1a-adrenoceptor gene.
• To confirm the identity and functional properties of the expressed mouse alpha1a-adrenoceptor.

Main Methods:

• Oligonucleotide primers were designed based on rat sequences for RT-PCR amplification of mouse cDNA from cerebral cortex, liver, and kidney.
• The amplified cDNA was cloned into a mammalian expression vector and expressed in COS-1 cells.
• Pharmacological characterization involved radioligand binding assays and functional assays measuring inositol phosphate production.

Main Results:

• The mouse cDNA sequence showed high identity to known alpha1a-adrenoceptors from other species, encoding a 466-amino acid peptide.
• The expressed protein exhibited high affinity for [3H]-prazosin and a similar antagonist affinity profile to the rat alpha1a-adrenoceptor.
• Functional assays demonstrated that the expressed receptor mediates noradrenaline-stimulated inositol phosphate production, indicating coupling to phospholipase C.

Conclusions:

• The cloned cDNA represents the mouse alpha1a-adrenoceptor.
• The expressed mouse alpha1a-adrenoceptor possesses pharmacological and functional properties consistent with its known roles.
• This study provides a valuable resource for further research into adrenoceptor function and signaling pathways.