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Excitatory role of the hyperpolarization-activated inward current in the electrical excitability of vasopressinergic supraoptic neurons after water deprivation

Grant number: 19/16765-2
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): November 01, 2019
Effective date (End): October 31, 2020
Field of knowledge:Biological Sciences - Physiology - Physiology of Organs and Systems
Principal researcher:Eduardo Colombari
Grantee:Elaine Fernanda da Silva
Supervisor abroad: Charles William Bourque
Home Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Research place: McGill University, Canada  
Associated to the scholarship:17/04649-2 - Experimental pathophysiology: role of central mechanisms of the cardiovascular and respiratory control changes induced by experimental hypertension and obesity, BP.PD

Abstract

Water deprivation (WD) activates vasopressinergic neurons located in the hypothalamic supraoptic nucleus (SON) increasing the levels of vasopressin (VP) into the blood, which acts promoting vasoconstriction and urinary water retention. Previous studies have shown that neurons of SON express members of the cyclic nucleotide-gated family of ion channels like the hyperpolarization-activated and nucleotide-gated cation (HCN) channel that contribute to their electrical excitability and VP release. However, the contribution of hyperpolarization-activated inward current (IH) for excitatory drive of vasopressinergic SON neurons after WD have not been studied previously. Therefore, we will evaluate the role of IH in the control of electrical activity of vasopressinergic SON neurons after WD. Electrophysiological recordings will be performed through the patch-clamp technique using transgenic rats expressing enhanced green fluorescent protein (eGFP) under the control of VP promoter (VP-eGFP rats). Control (euhydrated) rats will have continuous access to water and food, whereas WD rats will have the water but not food removed for 48 h before initiating the experiments. The IH will be evaluated using the IH blocker ZD 7288.

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