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Identification of molecules potentially involved in mediating the in vivo actions of the corticotropin-releasing hormone receptor 1 antagonist, NBI30775 (R121919)

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Abstract

Rationale

The neuropeptide corticotropin-releasing hormone (CRH) plays a central role in the regulation of the hypothalamo–pituitary–adrenocortical (HPA) axis. The view that CRH hypersecretion underlies anxiety and mood disorders was recently supported by preclinical and clinical data obtained after application of the CRH receptor (CRH-R1) antagonist NBI30775 (R121919). Despite its therapeutic efficacy, there is only little information about its mechanisms of action on cellular and molecular targets.

Objective

To identify some of the intracellular substrates mediating the actions of NBI30775 after its acute administration in a stress-independent animal model.

Results

Of the different doses of NBI30775 tested (0.5, 1, 5 and 30 mg/kg), the 1-mg/kg dose proved behaviorally active insofar that it reduced anxiety-like behavior in mice under basal conditions. Subsequent analysis of brain tissues revealed NBI30775-induced increases in the nuclear translocation of glucocorticoid receptors (GR) and BAG-1, an upregulation of mRNA transcripts encoding GR, mineralocorticoid receptors (MR) and CRH-R1, and a suppression of the DNA-binding activity of the transcription factor AP-1. These changes were significant at a dose of 1 mg/kg of NBI30775.

Conclusion

NBI30775 reduces levels of anxiety in mice (under basal conditions) with a steep dose–response curve. Molecules such as GR, MR, BAG-1 and AP-1 have been identified as some of the drug’s intracellular targets; interestingly, changes in these molecules have also been seen in response to conventional antidepressants, showing that structurally and mechanistically unrelated anxiolytic and antidepressant drugs can influence common downstream pathways.

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Acknowledgements

We thank Dr. Ulrike Schmidt for help and advice with the BAG-1 measurements.

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Authors and Affiliations

  1. Max Planck Institute of Psychiatry, Kraepelinstrasse 10, 80804, Munich, Germany

    Anke Post, Frauke Ohl, Osborne F. X. Almeida, Elisabeth B. Binder, Monika Rücker, Sandra Welt, Elke Binder, Florian Holsboer & Inge Sillaber

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  1. Anke Post
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  2. Frauke Ohl
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  3. Osborne F. X. Almeida
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Correspondence to Osborne F. X. Almeida.

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Post, A., Ohl, F., Almeida, O.F.X. et al. Identification of molecules potentially involved in mediating the in vivo actions of the corticotropin-releasing hormone receptor 1 antagonist, NBI30775 (R121919). Psychopharmacology 180, 150–158 (2005). https://doi.org/10.1007/s00213-004-2134-x

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