Reduced isolation-induced aggressiveness in mice following NAALADase inhibition.
RATIONALE: Long-term individual housing increases aggressive behavior in mice, a condition termed isolation-induced aggression; this aggressiveness is reduced by some antidepressants and anxiolytics. NMDA antagonists also inhibit isolation-induced aggression in mice. The enzyme N-acetylated-alpha-linked acidic dipeptidase (NAALADase) hydrolyzes the neurotransmitter N-acetylaspartylglutamate (NAAG) to form glutamate and N-acetylaspartate; NAAG acts as a partial NMDA agonist as well as a full agonist at the presynaptic metabotropic glutamate receptor 3 (mGluR3), where it acts to reduce glutamate release. OBJECTIVE: We postulated that NAALADase inhibition would reduce isolation-induced aggression in mice. METHODS: We tested whether acute exposure to the NAALADase inhibitor 2-[[hydroxy[2,3,4,5,6-pentafluorophenyl)methyl]phosphinyl]methyl] pentanedioic acid (GPI-5232), administered 30 min prior to a social interaction test, would inhibit aggressive behavior in SJL mice that had been individually housed long term. RESULTS: Administration of GPI-5232 (30 mg/kg, IP) inhibited initiation of aggressive behavior, indicated by greater latencies to display tail-rattling, attack and biting, and by fewer mice initiating aggressive behavior, compared to mice that received vehicle. In addition, GPI-5232 treated mice had fewer tail-rattling responses to a non-aggressive conspecific. CONCLUSIONS: The effectiveness of GPI-5232 in this animal model suggests that NAALADase inhibition may be a novel therapeutic approach to reduce or inhibit heightened aggressiveness, and possibly to treat aggressive behavior associated with psychiatric disorders.[1]References
- Reduced isolation-induced aggressiveness in mice following NAALADase inhibition. Lumley, L.A., Robison, C.L., Slusher, B.S., Wozniak, K., Dawood, M., Meyerhoff, J.L. Psychopharmacology (Berl.) (2004) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg
