Central relationship between oestradiol and Giot1 in osmotic regulation of ovariectomised rats

• Grant number: 16/19051-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2016
• End date: August 31, 2020
• Field of knowledge: Biological Sciences - Physiology - Physiology of Organs and Systems
• Principal Investigator: José Antunes Rodrigues
• Grantee: Ana Luíza Romero Terra dos Santos
• Host Institution: Faculdade de Medicina de Ribeirão Preto (FMRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
• Associated scholarship(s): 19/21616-6 - The role of hypothalamic Growth Hormone Receptor (GHR)-expressing neurons in glycemic control, BE.EP.IC

Abstract

Recent studies have shown that the water deprivation (WD) induces an increase in the abundance of the gonadotropin inducible ovarian transcription factor 1 (Giot1) mRNA expression in the supraoptic nucleus (SON) of hypothalamus involved on hydromineral homeostasis. It's wide knowledge that, for example water deprivation, activates hypothalamic neurons inducing the production and release of vasopressin (AVP) and oxytocin (OT), as well as increasing drink ingestion. Interestingly, AVP and OT release in response to WD was further increased after oestradiol (E2) replacement in female ovariectomized rats. Moreover, oestradiol also reduce water intake in WD, showing that E2 participates in hydromineral regulation. In addition, data from literature shows that, centrally E2 acts in specific hypothalamic pathways, but the E2 mechanisms involved on AVP and OT secretion are still unknown. In these context, this project proposes evaluate the relationship between oestradiol and Giot1 in CNS. To investigate the role of Giot1 on the hormonal release and water/saline intake, we will use ovariectomized rats with E2 replacement, summited to water deprivation. Furthermore, a lentiviral vector will be used to knockdown Giot1 in SON and PVN nuclei. In this set of animals, hormonal and behavioral parameters will be evaluate, as well as the central RNAm expression of various neuromodulators involved on hydromineral homeostasis.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ROMERO TERRA DOS SANTOS, ANA LUIZA; REIS, WAGNER LUIS; QUIROS-COGNUCK, SUSANA; LIMA, JULIANA BEZERRA; DOMINGUES, JULIANA TONIETTO; DE ARAUJO, LEONARDO DOMINGUES; GREENWOOD, MICHAEL PAUL; GREENWOOD, MINGKWAN; KAGOHARA ELIAS, LUCILA LEICO; MURPHY, DAVID; et al. Effects of gonadotropin inducible ovarian transcription factor 1 in the paraventricular nucleus on fluid intake after dehydration of ovariectomized female rats. Experimental Physiology, v. 106, n. 12, NOV 2021. (16/19051-2)