title: Regulation of TRH neurons and energy homeostasis-related signals under stress.
abstract: Energy homeostasis relies on a concerted response of the nervous and endocrine systems to signals evoked by intake, storage, and expenditure of fuels. Glucocorticoids (GCs) and thyroid hormones are involved in meeting immediate energy demands, thus placing the hypothalamo-pituitary-thyroid (HPT) and hypothalamo-pituitary-adrenal axes at a central interface. This review describes the mode of regulation of hypophysiotropic TRHergic neurons and the evidence supporting the concept that they act as metabolic integrators. Emphasis has been be placed on i) the effects of GCs on the modulation of transcription of Trh in vivo and in vitro, ii) the physiological and molecular mechanisms by which acute or chronic situations of stress and energy demands affect the activity of TRHergic neurons and the HPT axis, and iii) the less explored role of non-hypophysiotropic hypothalamic TRH neurons. The partial evidence gathered so far is indicative of a contrasting involvement of distinct TRH cell types, manifested through variability in cellular phenotype and physiology, including rapid responses to energy demands for thermogenesis or physical activity and nutritional status that may be modified according to stress history.
authors.affiliation: Departamento de Genética del Desarrollo y Fisiología MolecularInstituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), A.P. 510-3, Cuernavaca, Morelos 62250, Mexico joseph@ibt.unam.mx.
authors.forename: Patricia
authors.initials: P
authors.lastname: Joseph-Bravo
authors.affiliation: Departamento de Genética del Desarrollo y Fisiología MolecularInstituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), A.P. 510-3, Cuernavaca, Morelos 62250, Mexico.
authors.forename: Lorraine
authors.initials: L
authors.lastname: Jaimes-Hoy
authors.affiliation: Departamento de Genética del Desarrollo y Fisiología MolecularInstituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), A.P. 510-3, Cuernavaca, Morelos 62250, Mexico.
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Charli
mesh_terms: D000818:Animals; D004734:Energy Metabolism / Q000502:physiology*; D006706:Homeostasis; D006801:Humans; D007030:Hypothalamo-Hypophyseal System / Q000502:physiology; D009474:Neurons / Q000378:metabolism*; D010913:Pituitary-Adrenal System / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology; D013312:Stress, Physiological / Q000502:physiology*; D013973:Thyrotropin-Releasing Hormone / Q000378:metabolism / Q000502:physiology*
chemical_list: D013973:Thyrotropin-Releasing Hormone
keywords: HPA; HPT; metabolism; stress