title: Modulation of anxiety-like behavior and morphine dependence in CREB-deficient mice.
abstract: The transcription factor cAMP-responsive element binding protein (CREB) has been shown to regulate different physiological responses including drug addiction and emotional behavior. Molecular changes including adaptive modifications of the transcription factor CREB are produced during drug dependence in many regions of the brain, including the locus coeruleus (LC), but the molecular mechanisms involving CREB within these regions have remained controversial. To further investigate the involvement of CREB in emotional behavior, drug reward and opioid physical dependence, we used two independently generated CREB-deficient mice. We employed the Cre/loxP system to generate mice with a conditional CREB mutation restricted to the nervous system, where all CREB isoforms are lacking in the brain (Crebl(NesCre)). A genetically defined cohort of the previously described hypomorphic Crebl(alphadelta) mice, in which the two major transcriptionally active isoforms (alpha and delta) are disrupted throughout the organism, were also used. First, we investigated the responses to stress of the CREB-deficient mice in several paradigms, and we found an increased anxiogenic-like response in the both Creb1 mutant mice in different behavioral models. We investigated the rewarding properties of drugs of abuse (cocaine and morphine) and natural reward (food) using the conditioned place-preference paradigm. No modification of motivational responses of morphine, cocaine, or food was observed in mutant mice. Finally, we evaluated opioid dependence by measuring the behavioral expression of morphine withdrawal and electrophysiological recordings of LC neurons. We showed an important attenuation of the behavioral expression of abstinence and a decrease in the hyperactivity of LC neurons in both Creb1 mutant mice. Our results emphasize the selective role played by neuronal CREB in emotional-like behavior and the somatic expression morphine withdrawal, without participating in the rewarding properties induced by morphine and cocaine.
authors.affiliation: Laboratori de Neurofarmacologia, Facultat de Ciènces de la Salut i de la Vida, Universitat Pompeu Fabra, Barcelona, Spain.
authors.forename: Olga
authors.initials: O
authors.lastname: Valverde
authors.forename: Theo
authors.initials: T
authors.lastname: Mantamadiotis
authors.forename: María
authors.initials: M
authors.lastname: Torrecilla
authors.forename: Luisa
authors.initials: L
authors.lastname: Ugedo
authors.forename: Joseba
authors.initials: J
authors.lastname: Pineda
authors.forename: Susanne
authors.initials: S
authors.lastname: Bleckmann
authors.forename: Peter
authors.initials: P
authors.lastname: Gass
authors.forename: Oliver
authors.initials: O
authors.lastname: Kretz
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Mitchell
authors.forename: Günther
authors.initials: G
authors.lastname: Schütz
authors.forename: Rafael
authors.initials: R
authors.lastname: Maldonado
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001007:Anxiety / Q000378:metabolism / Q000503:physiopathology*; D001522:Behavior, Animal; D003216:Conditioning, Operant / Q000502:physiology; D017362:Cyclic AMP Response Element-Binding Protein / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D005106:Exploratory Behavior / Q000502:physiology; D007150:Immunohistochemistry / Q000379:methods; D008125:Locus Coeruleus / Q000378:metabolism; D018782:Maze Learning / Q000502:physiology; D051379:Mice; D018345:Mice, Knockout; D009021:Morphine Dependence / Q000503:physiopathology*; D009043:Motor Activity / Q000235:genetics / Q000502:physiology; D020033:Protein Isoforms / Q000172:deficiency / Q000235:genetics; D011930:Reaction Time; D013037:Spatial Behavior / Q000502:physiology; D013997:Time Factors
chemical_list: D017362:Cyclic AMP Response Element-Binding Protein; D020033:Protein Isoforms