GABAB receptors are expressed in human aortic smooth muscle cells and regulate the intracellular Ca2+ concentration

Wang, Xu-Ping, Cheng, Zhen-Ying, & Schmid, Katrina L. (2015) GABAB receptors are expressed in human aortic smooth muscle cells and regulate the intracellular Ca2+ concentration. Heart And Vessels, 30(2), pp. 249-257.

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Abstract

The aim of this study was to investigate the expression of GABAB receptors, a subclass of receptors to the inhibitory neurotransmitter gamma-aminobutyric acid (GABAB), in human aortic smooth muscle cells (HASMCs), and to explore if altering receptor activation modified intracellular Ca(2+) concentration ([Ca(2+)]i) of HASMCs. Real-time PCR, western blots and immunofluorescence were used to determine the expression of GABABR1 and GABABR2 in cultured HASMCs. Immunohistochemistry was used to localize the two subunits in human left anterior descending artery (LAD). The effects of the GABAB receptor agonist baclofen on [Ca(2+)]i in cultured HASMCs were demonstrated using fluo-3. Both GABABR1 and GABABR2 mRNA and protein were identified in cultured HASMCs and antibody staining was also localized to smooth muscle cells of human LAD. 100 μM baclofen caused a transient increase of [Ca(2+)]i in cultured HASMCs regardless of whether Ca(2+) was added to the medium, and the effects were inhibited by pre-treatment with CGP46381 (selective GABAB receptor antagonist), pertussis toxin (a Gi/o protein inhibitor), and U73122 (a phospholipase C blocker). GABAB receptors are expressed in HASMCs and regulate the [Ca(2+)]i via a Gi/o-coupled receptor pathway and a phospholipase C activation pathway

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ID Code: 78857
Item Type: Journal Article
Refereed: Yes
Keywords: GABA, smooth muscle, aorta
DOI: 10.1007/s00380-014-0499-2
ISSN: 0910-8327
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CARDIOVASCULAR MEDICINE AND HAEMATOLOGY (110200) > Cardiovascular Medicine and Haematology not elsewhere classified (110299)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2014 Springer
Deposited On: 21 Nov 2014 01:53
Last Modified: 18 Jun 2015 01:32

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