Prenatal cocaine alters dopamine and sigma receptor binding in nucleus accumbens and striatum in dams and adolescent offspring

Abstract

Maternal cocaine abuse is a societal problem with serious impact on both mother and child. Few studies exist that study the mother/offspring dyad of neurological effects of maternal cocaine abuse. The present study was designed to study alterations in D 2, D 3 and sigma receptor density in nucleus accumbens and striatum of dams and male and female offspring following gestational cocaine. Long-Evans female rats were implanted with an intravenous (i.v.) access port prior to breeding and were administered saline or 3.0 mg/kg of cocaine from gestational day (GD) GD8–20 (1 injection/day-GD8–14, 2 injections/day-GD15–20). Offspring were raised by maternal dams and allowed to mature until postnatal days 31–35, at which time dams and offspring were sacrificed for assay of radioligand binding. In dams, decreased D 2 (24.6%) and D 3 (36.9%) binding was observed in striatum. Female offspring displayed no differences in receptor binding in either region. Male offspring displayed decreased D 2 receptor binding (27.1%) in nucleus accumbens and increased D 3 (75.2% and 33.5%) and sigma receptor binding (73.4% and 53.1%) in accumbens and striatum, respectively. Collectively, these data clearly demonstrate that male offspring exhibit significant alterations in D 2, D 3 and sigma receptor binding. These results suggest that dams and offspring display long-lasting alterations (5 weeks) in dopamine receptor binding. These alterations in dopamine and sigma receptor binding in offspring following prenatal cocaine and rearing by maternal dams are sex specific and could have profound effects on the development of behavior.