title: Corticotropin-releasing hormone activates ERK1/2 MAPK in specific brain areas.
abstract: Corticotropin-releasing hormone (CRH) coordinates hormonal and behavioral responses to stress. The mitogen-activated protein kinase extracellular signal-related kinase 1/2 (ERK1/2) mediates several functions in different forebrain structures and recently has been implicated in CRH signaling in cultured cells. To study in vivo CRH-mediated activation of central ERK1/2, we investigated the expression pattern of the phosphorylated ERK1/2(p-ERK1/2) in the mouse brain after intracerebroventricular CRH injections. As shown by immunohistochemistry and confocal microscopy analysis, CRH administration increased p-ERK1/2 levels specifically in the CA3 and CA1 hippocampal subfields and basolateral complex of the amygdala, both structures related to external environmental information processing and behavioral aspects of stress. Other regions such as hypothalamic nuclei and the central nucleus of the amygdala, also related to central CRH system but involved in the processing of the ascending visceral information and neuroendocrine-autonomic response to stress, did not show CRH-mediated ERK1/2 activation. To dissect the involvement of CRH receptor 1 (CRHR1) and CRHR2, we used conditional knockout mice in which Crhr1 is inactivated in the anterior forebrain and limbic structures. The conditional genetic ablation of Crhr1 inhibited the p-ERK1/2 increase, underlining the involvement of CRHR1 in the CRH-mediated activation. These findings underscore the fact that CRH activates p-ERK1/2 through CRHR1 only in selected brain regions, pointing to a specific role of this pathway in mediating behavioral adaptation to stress.
authors.affiliation: Departamento Fisiología y Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Laboratorio de Fisiología y Biología Molecular, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina.
authors.forename: Damián
authors.initials: D
authors.lastname: Refojo
authors.forename: Carlos
authors.initials: C
authors.lastname: Echenique
authors.forename: Marianne B
authors.initials: MB
authors.lastname: Müller
authors.forename: Johannes M H M
authors.initials: JM
authors.lastname: Reul
authors.forename: Jan M
authors.initials: JM
authors.lastname: Deussing
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wurst
authors.forename: Inge
authors.initials: I
authors.lastname: Sillaber
authors.forename: Marcelo
authors.initials: M
authors.lastname: Paez-Pereda
authors.forename: Florian
authors.initials: F
authors.lastname: Holsboer
authors.forename: Eduardo
authors.initials: E
authors.lastname: Arzt
mesh_terms: D000818:Animals; D001921:Brain / Q000201:enzymology*; D003346:Corticotropin-Releasing Hormone / Q000494:pharmacology*; D004789:Enzyme Activation; D007031:Hypothalamus / Q000201:enzymology; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D018613:Microscopy, Confocal; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism*; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism*; D009928:Organ Specificity; D016548:Prosencephalon / Q000201:enzymology
chemical_list: D003346:Corticotropin-Releasing Hormone; D048052:Mitogen-Activated Protein Kinase 3; D020929:Mitogen-Activated Protein Kinase Kinases