Influence of handling or aversive stimulation during rats' neonatal or adolescence periods on oral cocaine self-administration and cocaine withdrawal

Behavioural Pharmacology
A R MarquardtH M T Barros

Abstract

Adverse early life events may influence vulnerability for drug intake. The influence of handling or aversive stimulation during neonatal or adolescent periods on adult cocaine oral self-administration and withdrawal were investigated. Neonatal or adolescent rats were exposed to a modified unpredictable stress paradigm or handling for 10 days. When adults, oral cocaine was offered through the two-bottle choice paradigm for 30 days. Rats were submitted to the forced swimming test after cocaine withdrawal. Overall, there was a significant increase of cocaine choice throughout the days of cocaine consumption and an interaction between interventions and cocaine daily choice. Control rats started cocaine intake at a lower level and increased cocaine choice over time, while animals submitted to neonatal interventions started cocaine intake at higher levels of choice, with less increase in cocaine intake during the period of cocaine exposure. Rats receiving aversive stimulation during adolescence also started taking cocaine solution at higher levels. Significantly higher immobility duration and shorter latency to immobility during the forced swimming were detected in these same adolescents that received unpredictable stress, when compa...Continue Reading

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Apr 8, 2021·The European Journal of Neuroscience·Sophia C LevisStephen V Mahler

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