The corticotropin-releasing factor1 receptor antagonist R121919 attenuates the behavioral and endocrine responses to stress

David A. Gutman, Michael J. Owens, Kelly H. Skelton, K. V. Thrivikraman, Charles B. Nemeroff

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


Corticotropin-releasing factor (CRF) is the major physiological regulator of the hypothalamic-pituitary-adrenal (HPA) axis and serves to coordinate the mammalian endocrine, autonomic, and behavioral responses to stress. Considerable literature from clinical and preclinical data suggests that hypersecretion of hypothalamic and/or extrahypothalamic CRF systems is a major factor in the pathogenesis of affective and anxiety disorders. Based on this premise, a CRF1 receptor antagonist has been hypothesized to possess anxiolytic and/or antidepressant properties. In this study, an acute dose of the lipophilic CRF1 receptor antagonist 3-[6-(dimethylamino)-4-methyl-pyrid-3-yl]-2,5-dimethyl-N,N-dipropyl- pyrazolo[2,3-a]pyrimidin-7-amine (R121919), administered i.v. to rats with surgically implanted jugular cannula 60 min before a 5-min restraint stress, dose dependently attenuated peak plasma adrenocorticopin hormone (ACTH) and corticosterone concentrations by 91 and 75%, respectively. In a second study, acute administration of R121919 reduced measures of anxiety in a rodent defensive withdrawal paradigm. R121919 dose dependently decreased latency to exit the tube, and total time spent in the tube 60 min after a single subcutaneous administration. In addition, the ACTH and corticosterone response to novelty was decreased by 82 and 97%, respectively, at the 10-mg/kg dose of R121919. In another study, this dose was associated with approximately an 85% occupancy of the CRF1 receptor in the cortex measured 75-min postsubcutaneous injection. These data confirm that R121919 acts as a CRF1 receptor antagonist in vivo, attenuates HPA axis responsivity, and possesses anxiolytic properties.

Original languageEnglish (US)
Pages (from-to)874-880
Number of pages7
JournalJournal of Pharmacology and Experimental Therapeutics
Issue number2
StatePublished - Feb 1 2003
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology


Dive into the research topics of 'The corticotropin-releasing factor1 receptor antagonist R121919 attenuates the behavioral and endocrine responses to stress'. Together they form a unique fingerprint.

Cite this