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BEHAVIORAL PHARMACOLOGY

Maternal Separation and Handling Affects Cocaine Self-Administration in Both the Treated Pups as Adults and the Dams

Division of Neuroscience, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia (M.C.M., J.H., M.J.K.); Departments of Psychology and Public Health, University of California, Berkeley, California (D.F.); and Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana (S.P.S., W.I.D.)

Repeated maternal separation of pups from dams is often used as an early life stressor that causes profound neurochemical and behavioral changes in the pups that persist into adulthood. The effects of maternal separation on both the dams and the treated pups as adults on cocaine self-administration were examined using four separation conditions: 15- or 180-min separation (MS15 and MS180), brief handling without separation (MS0), and a nonhandled group (NH). The separations and handling occurred daily on postnatal days 2 to 15. The acquisition of cocaine self-administration (0.0625–1.0 mg/kg/infusion) was evaluated in the treated pups as adults. The MS180 group acquired cocaine self-administration at the lowest dose tested (0.0625 mg/kg/infusion), whereas the MS15s did not respond for cocaine at rates greater than that seen with saline administration. The NH group received the greatest number of infusions and intake at the highest doses. After self-administration, no differences were observed between groups in activity of two liver carboxylesterases involved in the inactivation of cocaine, ES10 and ES4. Maternal separation affected cocaine self-administration in the dams as well. Although there was an overall significant affect of treatment on cocaine self-administration, the length of separation (15 or 180 min) did not affect cocaine self-administration on the dams. The MS0 dams averaged a greater number of infusions per session than NH group during the 1st week of acquisition. These data suggest that in addition to the profound changes that occur in pups as result of maternal separation, the dams are also susceptible to alterations in behaviors.

Address correspondence to: Dr. Mark Moffett, Division of Neuroscience, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road NE, Atlanta, GA 30329. E-mail: mcmoffe{at}emory.edu

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