RATIONALE: Corticotropin-releasing factor (CRF) is the primary physiologic regulator of the hypothalamic-pituitary-adrenal (HPA) axis and serves to globally coordinate the mammalian stress response. Hyperactivity of central nervous system CRF neurotransmission, acting primarily via the CRF(1) receptor, has been strongly implicated in the pathophysiology of depression and anxiety. Furthermore, there is evidence of enhanced CRF transcription, release, and neuronal activity after the administration of and withdrawal from several drugs of abuse, including cannabis, cocaine, ethanol, and morphine. Treatment with CRF antagonists has been demonstrated to reduce the severity of certain drug withdrawal symptoms, implicating a specific role for activation of CRF neurons in mediating the anxiogenic and stress-like reactions observed after abrupt drug discontinuation. OBJECTIVES/ METHODS: To extend these findings, we investigated whether pretreatment with the selective CRF(1) receptor antagonist R121919 decreases the behavioral and neuroendocrine activation observed after the precipitation of benzodiazepine (BZ) withdrawal in BZ-dependent rats. RESULTS: Pretreatment with R121919 attenuated the subsequent HPA axis activation, behavioral measures of anxiety, and expression of the CRF gene in the paraventricular nucleus of the hypothalamus, as measured by CRF heteronuclear RNA, which occurs after flumazenil-precipitation of withdrawal from the BZ, lorazepam. CONCLUSIONS: These results indicate that the activation of CRF neuronal systems may be a common neurobiological mechanism in withdrawal from drugs of abuse and moreover, that the CRF(1) receptor subtype plays a major role in mediating the effects of CRF on neuroendocrine and behavioral responses during BZ withdrawal. Therefore, CRF(1) receptor antagonists may be of therapeutic utility in the treatment of drug withdrawal syndromes.
RATIONALE: Corticotropin-releasing factor (CRF) is the primary physiologic regulator of the hypothalamic-pituitary-adrenal (HPA) axis and serves to globally coordinate the mammalian stress response. Hyperactivity of central nervous system CRF neurotransmission, acting primarily via the CRF(1) receptor, has been strongly implicated in the pathophysiology of depression and anxiety. Furthermore, there is evidence of enhanced CRF transcription, release, and neuronal activity after the administration of and withdrawal from several drugs of abuse, including cannabis, cocaine, ethanol, and morphine. Treatment with CRF antagonists has been demonstrated to reduce the severity of certain drug withdrawal symptoms, implicating a specific role for activation of CRF neurons in mediating the anxiogenic and stress-like reactions observed after abrupt drug discontinuation. OBJECTIVES/ METHODS: To extend these findings, we investigated whether pretreatment with the selective CRF(1) receptor antagonist R121919 decreases the behavioral and neuroendocrine activation observed after the precipitation of benzodiazepine (BZ) withdrawal in BZ-dependent rats. RESULTS: Pretreatment with R121919 attenuated the subsequent HPA axis activation, behavioral measures of anxiety, and expression of the CRF gene in the paraventricular nucleus of the hypothalamus, as measured by CRF heteronuclear RNA, which occurs after flumazenil-precipitation of withdrawal from the BZ, lorazepam. CONCLUSIONS: These results indicate that the activation of CRF neuronal systems may be a common neurobiological mechanism in withdrawal from drugs of abuse and moreover, that the CRF(1) receptor subtype plays a major role in mediating the effects of CRF on neuroendocrine and behavioral responses during BZ withdrawal. Therefore, CRF(1) receptor antagonists may be of therapeutic utility in the treatment of drug withdrawal syndromes.
Authors: D W Schulz; R S Mansbach; J Sprouse; J P Braselton; J Collins; M Corman; A Dunaiskis; S Faraci; A W Schmidt; T Seeger; P Seymour; F D Tingley; E N Winston; Y L Chen; J Heym Journal: Proc Natl Acad Sci U S A Date: 1996-09-17 Impact factor: 11.205
Authors: G W Smith; J M Aubry; F Dellu; A Contarino; L M Bilezikjian; L H Gold; R Chen; Y Marchuk; C Hauser; C A Bentley; P E Sawchenko; G F Koob; W Vale; K F Lee Journal: Neuron Date: 1998-06 Impact factor: 17.173
Authors: Walter Francesconi; Fulvia Berton; Vez Repunte-Canonigo; Kazuki Hagihara; David Thurbon; Dusan Lekic; Sheila E Specio; Thomas N Greenwell; Scott A Chen; Kenner C Rice; Heather N Richardson; Laura E O'Dell; Eric P Zorrilla; Marisela Morales; George F Koob; Pietro Paolo Sanna Journal: J Neurosci Date: 2009-04-29 Impact factor: 6.167
Authors: Raúl Pastor; Carrie S McKinnon; Angela C Scibelli; Sue Burkhart-Kasch; Cheryl Reed; Andrey E Ryabinin; Sarah C Coste; Mary P Stenzel-Poore; Tamara J Phillips Journal: Proc Natl Acad Sci U S A Date: 2008-07-01 Impact factor: 11.205