Prenatal Cocaine Exposure: Long-Term Deficits in Learning and Motor Performance^a

Area of Science:

• Neuroscience
• Developmental Biology
• Pharmacology

Background:

• Prenatal exposure to drugs of abuse can impact offspring neurodevelopment.
• The anterior cingulate cortex (ACC) plays a crucial role in cognitive functions.
• Understanding long-term effects of prenatal cocaine exposure is vital.

Purpose of the Study:

• To establish a rabbit model for studying in utero cocaine exposure.
• To investigate the effects of prenatal cocaine on brain development and behavior.
• To characterize learning and motor deficits in cocaine-exposed offspring.

Main Methods:

• Rabbits received twice-daily intravenous cocaine injections from gestational days 8-29.
• Offspring were assessed for physical characteristics, brain development, and behavioral performance.
• Neurochemical and structural analyses of the anterior cingulate cortex were performed.

Main Results:

• No significant differences in maternal or offspring physical characteristics were observed.
• Cocaine-exposed offspring exhibited abnormal structural and neurochemical development of the ACC.
• Adult rabbits showed impaired motor function, associative learning, and discrimination learning.

Conclusions:

• Prenatal cocaine exposure leads to persistent abnormalities in the anterior cingulate cortex.
• These brain alterations correlate with significant deficits in motor control and learning.
• Attentional process deficits contribute to impaired discrimination learning in cocaine progeny.