Psychopharmacology

, Volume 209, Issue 4, pp 303–311

Angiotensin IV elevates oxytocin levels in the rat amygdala and produces anxiolytic-like activity through subsequent oxytocin receptor activation

Authors

    • Pfizer Global Research and Development CN8000
    • Lohocla Research Corporation
    • Department of Pharmacology, School of MedicineUniversity of Colorado Denver
  • Jason M. Dwyer
    • Pfizer Global Research and Development CN8000
  • Brian J. Platt
    • Pfizer Global Research and Development CN8000
  • Sarah Neal
    • Pfizer Global Research and Development CN8000
  • Bin Luo
    • Pfizer Global Research and Development CN8000
  • Huai-Ping Ling
    • Pfizer Global Research and Development CN8000
  • Qian Lin
    • Pfizer Global Research and Development CN8000
  • Robert J. Mark
    • Pfizer Global Research and Development CN8000
  • Sharon Rosenzweig-Lipson
    • Pfizer Global Research and Development CN8000
  • Lee E. Schechter
    • Pfizer Global Research and Development CN8000
Original Investigation

DOI: 10.1007/s00213-010-1791-1

Cite this article as:
Beyer, C.E., Dwyer, J.M., Platt, B.J. et al. Psychopharmacology (2010) 209: 303. doi:10.1007/s00213-010-1791-1

Abstract

Introduction

The effects of angiotensin (Ang) IV result from binding to a constitutively active metallopeptidase known as the AT4 receptor (or oxytocinase/insulin-regulated membrane aminopeptidase). While in vitro evidence indicates that Ang IV inhibits the peptidase activity of AT4 receptors, leading to increases in the concentrations of several peptides, including oxytocin, the consequence of inhibiting AT4 peptidase activity in vivo remains unresolved.

Discussion

Microdialysis coupled to immunoassay techniques revealed that systemic and intra-amygdala injection of Nle-Ang IV, a metabolically stable derivative of Ang IV, significantly elevated extracellular levels of oxytocin in the rat amygdala. Based on earlier reports describing the anxiolytic-like effects of oxytocin, we investigated whether disrupting AT4 peptidase activity would yield similar responses. In the mouse four-plate test, acute treatment with either Nle-Ang IV or LVV-hemorphin-7, a related AT4 receptor ligand, elicited significant increases in the number of punished crossings. These behavioral responses were comparable to the anxiolytic-like effects of oxytocin and to the standard anxiolytic agent, chlordiazepoxide. Cotreatment with either the AT4 receptor antagonist, divalinal, or the selective oxytocin receptor antagonist, WAY-162720, reversed the anxiolytic-like effects of Nle-Ang IV, while combining ineffective doses of Nle-Ang IV and oxytocin increased the number of punished crossings in this assay. Conversely, Nle-Ang IV and LVV-hemorphin-7 were inactive in the mouse tail suspension test of antidepressant activity. These findings represent the first in vivo demonstration of the peptidase activity of AT4 receptors, confirm the anxiolytic-like properties of Ang IV, and reveal a unique and previously uncharacterized relationship between AT4 and oxytocin receptor systems.

Keywords

AT4 receptorsNle-angiotensin IVLVV-hemorphin-7DivalinalOxytocinAnxiety

Copyright information

© Springer-Verlag 2010