title: Estrogen receptors ERα and ERβ participation in hypothalamus-pituitary-adrenal axis activation by hemorrhagic stress.
abstract: The sympato-adrenal-system and hypothalamus-pituitary-adrenal (HPA) axis are anatomically and functionally connected with participation of several brain areas that express estrogen receptors (ERα and ERβ). We assessed the neuronal activity of these areas for FOS expression and the action of PPT (ERα agonist) or DPN (ERβ agonist) in HPA axis activity during hemorrhagic stress. Ovariectomized Wistar rats treated with vehicle (DMSO) or ER agonists were catheterized for blood collection. Animals received (control) or not (hemorrhagic) immediate reposition with the same volume of saline. Immunohistochemistry was performed for FOS, tyrosine hydroxylase (TH) and corticotropin releasing hormone (CRH) in the brain areas. In vehicle-treated animals, hemorrhage enhanced: plasma corticosterone (CORT), oxytocin (OT) and vasopressin (AVP) measured by radioimmunoassay; the expression of TH-FOS co-localized neurons in ventrolateral medulla (A1C1) and FOS expression in medial parvocellular paraventricular nucleus (mpPVN). In controls, PPT decreased: plasma CORT; FOS expression at locus coeruleus (LC); FOS and CRH-FOS at mpPVN, compared to vehicle. After hemorrhage, PPT decreased: plasma CORT; FOS expression at LC and mpPVN; TH-FOS at LC, solitary tract nucleus (NTS), A1C1; CRH-FOS at mpPVN, compared to vehicle. After hemorrhage DPN decreased: plasma CORT; FOS expression at LC and mpPVN; TH-FOS at LC, A1C1; CRH-FOS at mpPVN, compared to vehicle. PPT blocked the increase of OT secretion and increased AVP secretion, after hemorrhage. DPN reduced OT and increased AVP levels, regardless hemorrhage. In hemorrhagic stress, ERα and ERβ reduced the HPA axis activation and neuronal activity in brain areas involved in the HPA axis control.
authors.affiliation: Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirão Preto - SP, Brazil.
authors.forename: Luana Maria
authors.initials: LM
authors.lastname: Silva-Alves
authors.affiliation: Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirão Preto - SP, Brazil.
authors.forename: Procópio Cleber Gama de
authors.initials: PC
authors.lastname: Barcelos Filho
authors.affiliation: Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirão Preto - SP, Brazil. Electronic address: crfranci@fmrp.usp.br.
authors.forename: Celso Rodrigues
authors.initials: CR
authors.lastname: Franci
mesh_terms: D000818:Animals; D003346:Corticotropin-Releasing Hormone / Q000378:metabolism; D047628:Estrogen Receptor alpha / Q000378:metabolism*; D047629:Estrogen Receptor beta / Q000378:metabolism*; D005260:Female; D006470:Hemorrhage / Q000378:metabolism; D007030:Hypothalamo-Hypophyseal System / Q000378:metabolism*; D010286:Paraventricular Hypothalamic Nucleus / Q000378:metabolism; D010913:Pituitary-Adrenal System / Q000378:metabolism*; D017208:Rats, Wistar; D011960:Receptors, Estrogen / Q000378:metabolism; D013312:Stress, Physiological / Q000502:physiology*
chemical_list: D047628:Estrogen Receptor alpha; D047629:Estrogen Receptor beta; D011960:Receptors, Estrogen; D003346:Corticotropin-Releasing Hormone
keywords: ERα; ERβ; FOS; HPA axis; hemorrhage; tyrosine hydroxylase