Involvement of the 5-HT1A receptor of the cuneiform nucleus in the regulation of cardiovascular responses during normal and hemorrhagic conditions

Mohebbati, Reza and Hosseini, Mahmoud and Khazaei, Majid and Khajavirad, Abolfazl and Shafei, Mohammad Naser (2020) Involvement of the 5-HT1A receptor of the cuneiform nucleus in the regulation of cardiovascular responses during normal and hemorrhagic conditions. Iranian Journal of Basic Medical Sciences, 23 (7). pp. 858-864.

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Abstract

Objective(s): The 5-hydroxytryptamine1A (5-HT1A) receptor is one of the serotonin receptors in the brain, which regulates cardiovascular responses, especially in hemorrhage. Presence of this receptor in the cuneiform nucleus (CnF) has been shown. The present study evaluates the cardiovascular effect of this receptor of the CnF in normal and hypotensive hemorrhagic rats.Materials and Methods: Agonist (8-OH-DPAT) and antagonist (WAY-100635) of 5-HT1A microinjected into the CnF in basal and hemorrhagic conditions and cardiovascular responses were evaluated. Hemorrhage induced by blood withdrawal from the femoral artery and 2 min after that drugs microinjected. Time course and peak changes (∆) of the mean arterial pressure (MAP), systolic blood pressure (SBP) and heart rate (∆HR) were obtained and compared to the control and hemorrhage groups.Results: In basal condition, 8-OH-DPAT significantly decreased ∆SBP, ∆MAP and ∆HR compared to the control (P<0.05-P<0.01), while way-100635 did not have a significant effect. Hypotension and tachycardia induced by hemorrhage ameliorated by agonist (P<0.05-P<0.01), while antagonist deteriorated hypotension (P<0.05) but attenuated tachycardia (P<0.01).Conclusion: This study shows that 5-HT1A receptor of the CnF involves in regulation of the cardiovascular responses. However, this effect in basal and hemorrhage conditions is different.

Item Type: Article
Uncontrolled Keywords: Hemorrhage,Mean arterial pressure,Medullary nucleus,Serotonin receptor,Systolic blood pressure
Subjects: QT physiology
Divisions: Journals > Iranian J Basic Medical Sciences
Depositing User: ijbms ijbms
Date Deposited: 16 Jun 2020 07:38
Last Modified: 16 Jun 2020 07:38
URI: http://eprints.mums.ac.ir/id/eprint/19299

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