Prenatal Coca Paste Exposure Impairs Hippocampal Neuronal Development and Recognition Memory in Offspring

Area of Science:

• Neuroscience
• Developmental Psychology
• Public Health

Background:

• Illicit psychostimulant use during pregnancy poses significant public health risks.
• Prenatal exposure to crack cocaine and coca paste (CP) is linked to neurodevelopmental impairments in children.
• Specific neurodevelopmental consequences of prenatal CP exposure are not well understood.

Purpose of the Study:

• To investigate the effects of prenatal exposure to street-grade coca paste (CP) on hippocampal development and function in a rat model.
• To assess impacts on neuronal structure, synaptogenesis, and hippocampus-dependent memory.

Main Methods:

• Rats were exposed to CP daily from gestational day 8 to 21.
• Hippocampal neurons from neonates were analyzed for survival, neurite outgrowth, and dendritic complexity.
• Synaptic vGlut1 abundance was measured.
• Recognition memory was assessed using the novel object recognition task in juvenile offspring.

Main Results:

• Prenatal CP exposure led to reduced neuronal survival, impaired neurite outgrowth, and decreased dendritic complexity in hippocampal neurons.
• Reduced synaptic vGlut1 abundance was observed.
• Offspring exhibited significant deficits in recognition memory.

Conclusions:

• Prenatal CP exposure disrupts hippocampal development and function, resulting in cognitive deficits.
• The findings underscore the severe neurodevelopmental risks associated with prenatal CP exposure.
• Preventive strategies for drug use during pregnancy are crucial.