Involvement of both GABAA and GABAB receptors in tonic inhibitory control of blood pressure at the rostral ventrolateral medulla of the rat
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- Amano, M. & Kubo, T. Naunyn-Schmiedeberg's Arch Pharmacol (1993) 348: 146. doi:10.1007/BF00164791
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The rostral ventrolateral medulla (RVLM) contains vasopressor neurons which increase vasomotor tone. Endogenous GABA is suggested to be involved in mediation of the tonic inhibition of vasopressor neurons in the RVLM. To obtain more precise information about GABAergic mechanisms in the RVLM, we microinjected GABA agonists and antagonists unilaterally into the RVLM and examined their effects on blood pressure and heart rate. In addition, involvement of the other inhibitory amino acids glycine, β-alanine and taurine in blood pressure regulation in the rat RVLM was also investigated. Male Wistar rats were anesthetized with urethane, paralyzed and artificially ventilated. The GABAA agonist muscimol (3–30 pmol) and the GABAB agonist baclofen (10–100 pmol) microinjected into the RVLM produced a decrease in blood pressure. The GABAA antagonist bicuculline (300 pmol) abolished the depressor response to muscimol (10 pmol) but not to baclofen (30 pmol) whereas the GABAB antagonist 2-hydroxysaclofen (1 nmol) abolished the depressor response to baclofen (30 pmol) but not to muscimol (10 pmol). Either bicuculline or 2-hydroxysaclofen alone produced a pressor response. Both antagonists inhibited depressor response to nipecotic acid (7.7 nmol)and GABA (0.3 nmol). Glycine (0.13 – 4.0 nmol), β-alanine (0.11 – 3.4 nmol) and taurine (0.08 – 2.4 nmol) microinjected into the RVLM also produced decreases in blood pressure. The glycine antagonist strychnine (0.58 nmol) abolished the depressor response to glycine, β-alanine and taurine but not to GABA. The taurine antagonist (6-aminomethyl-3-methyl-4-H-1,2,4-benzothiadiazine-1,1-diox-ide) (1.3 nmol) inhibited the depressor response to β-alanine and taurine but not to glycine and GABA. These results show that in the rat RVLM there exist GABAA and GABAB receptors, and that endogenous GABA tonically stimulates both GABAA and GABAB receptors to decrease arterial pressure. It seems unlikely that glycine and taurine are involved in mediation of the tonic inhibition of vasopressor neurons in the rat RVLM.