Prenatal alcohol treatment attenuated postnatal cocaine-induced elevation of dopamine concentration in nucleus accumbens: a preliminary study.
Prenatal alcohol exposure has been shown to damage the developing central nervous system (CNS) in a variety of ways, including neuroanatomical anomalies, neurochemical imbalance, and neuropharmacological dysfunction. The present study investigated one of the functional aspects of dopaminergic system in neonatal rats exposed prenatally to a binge-like alcohol paradigm by measuring dopamine concentrations following a single postnatal cocaine challenge. Pregnant Sprague-Dawley rats were given daily intragastric intubations of 5.1 g/kg alcohol solution from embryonic day (E) 1 to 20. Pair-fed and ad lib-fed animals served as controls. On E33 (usually postnatal day 10), offspring from all groups were given injections (IP) of either 0, 20, or 40 mg/kg cocaine. Animals were sacrificed and the substantia nigra/ventral tegmental area (SN/VTA) and nucleus accumbens (NAc) were dissected for the determination of dopamine concentrations using HPLC. Basal dopamine levels (0 mg/kg cocaine group) did not alter as a function of prenatal alcohol treatment in either region. However, acute cocaine injection increased the dopamine content in NAc, but not in SN/VTA, in ad lib-fed animals, and this elevation in dopamine level was significantly attenuated by prenatal alcohol treatment in both female and male animals, and by prenatal pair-fed treatment in male animals. Taken together, these results indicate that there appears to be a regional difference in acute cocaine-induced dopamine elevation, and prenatal binge-like alcohol exposure significantly alters the functional responsiveness of dopaminergic system in NAc. Furthermore, these data suggest that male offspring may be more sensitive to stress-associated or nutritional influences during gestation.
Chen
W J
WJ
Department of Human Anatomy & Medical Neurobiology, College of Medicine, Texas A&M University Health Science Center, College Station 77843-1114, USA.
Maier
S E
SE
West
J R
JR
D000818:Animals; D000831:Animals, Newborn; D001835:Body Weight / Q000187:drug effects; D003042:Cocaine / Q000037:antagonists & inhibitors*; D004298:Dopamine / Q000378:metabolism*; D018765:Dopamine Uptake Inhibitors / Q000037:antagonists & inhibitors*; D004353:Drug Evaluation, Preclinical; D000431:Ethanol / Q000097:blood / Q000506:poisoning*; D005260:Female; D008297:Male; D009714:Nucleus Accumbens / Q000187:drug effects* / Q000378:metabolism; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D013378:Substantia Nigra / Q000187:drug effects / Q000378:metabolism; D017557:Ventral Tegmental Area / Q000187:drug effects / Q000378:metabolism
D018765:Dopamine Uptake Inhibitors; D000431:Ethanol; D003042:Cocaine; D004298:Dopamine