Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9894399 | Regulatory Peptides | 2005 | 7 Pages |
Abstract
The present experiment was designed to investigate the possible involvement of glutamate and taurine in the depressor response produced by angiotensin (Ang)-(1-7) at the caudal ventrolateral medulla (CVLM) in rats anesthetized with urethane and α-chloralose. Microinjection of Ang-(1-7) into the CVLM elicited a depressor response which was partially blocked by nonselective glutamate receptors antagonist kynurenic acid, whereas selective Ang-(1-7) antagonist Ang779 produced a pressor response which was significantly attenuated by taurine receptors antagonist 6-aminomethyl-3-methyl-4H-1,2,4-benzothiadiazine-1,1-dioxide. Release of glutamate and taurine in the CVLM was evaluated with microdialysis, and the contents of these amino acids were measured with high performance liquid chromatography-fluorescent detection. The depressor response to Ang-(1-7) was accompanied by an increased release of glutamate and a decrease of taurine at the CVLM, whereas the pressor response to Ang779 was associated with a decreased release of glutamate and an increase of taurine. These results suggest that Ang-(1-7) and its antagonist Ang779 modulate the release of glutamate and taurine at the CVLM, which in turn contributes at least in part to the blood pressure response to Ang-(1-7) and Ang779.
Keywords
Related Topics
Life Sciences
Biochemistry, Genetics and Molecular Biology
Biochemistry
Authors
Jin Wang, Ying-Jie Peng, Da-Nian Zhu,