Distress vocalizations in maternally separated mouse pups: modulation via 5-HT1A, 5-HT1B and GABA(A) receptors

Rationale: Young rodents emit ultrasonic vocalizations (USVs) when separate d from their dams and littermates. Pharmacological agents that act on GABA, and/or 5-HT receptors and that alleviate anxiety in humans reduce the emis sion of these calls. Objectives: 1) to investigate specific 5-HT1 receptor subtypes that modulate maternal separation-induced USVs in mice; 2) to asse ss the behavioral specificity of these effects; and 3) to compare 5-HT1 ago nists with a positive neurosteroid modulator of the GABA(A) receptor comple x. Methods: Seven-day old CFW mouse pups were isolated from their littermat es and placed onto a 20 degrees C surface for 4 min. USVs between 30 and 80 kHz, grid crossing, and rectal temperature were measured in separate group s of mouse pups following subcutaneous administration of 5-HT1A and 5-HT1B receptor agonists and antagonists, the neurosteroid allopreg-nanolone, or t he benzodiazepine midazolam. Results: The 5-HT1A agonists (+)8-OH-DPAT (0.0 1-0.1 mg/kg) and flesinoxan (0.3-1.0 mg/kg), the selective 5-HT1B agonist C P-94,253 (0.03-30.0 mg/kg), and the mixed 5-HT1B/2C receptor agonist TFMPP (0.1-10.0 mg/kg) dose-dependently reduced USVs. These effects were reversed by the 5-HT1A receptor antagonist WAY 100,635 (0.1 mg/kg) or the 5-HT1B/D receptor antagonist GR 127935 (0.1 mg/kg). The effects of TFMPP were biphas ic; low doses (i.e. 0.01 and 0.03 mg/kg) increased the rate of vocalization . Midazolam and allopregnanolone also reduced USVs. The highest doses of fl esinoxan, (+)8-OH-DPAT, and allopregnanolone suppressed locomotion, whereas CP-94,253, TFMPP, and midazolam stimulated motor activity. Conclusions: Th ese experiments confirm that agonists at the 5-HT1 receptors and a positive allosteric modulator of the GABA(A) receptor complex decrease maternal sep aration-induced USVs in mice, with 5-HT1B manipulations dissociating the ef fects on vocalizations from sedative effects.