Va. Molina et al., THE BEHAVIORAL-RESPONSE TO STRESS IS ALTERED IN ADULT-RATS EXPOSED PRENATALLY TO COCAINE, Physiology & behavior, 55(5), 1994, pp. 941-945
The behaviors displayed during and following acute stress exposure wer
e investigated in rats prenatally exposed to cocaine. Offspring from S
prague-Dawley rat dams given SC injections of 40 mg/kg/3 cc cocaine HC
l (C40) daily from gestational days 8-20, pair-fed dams injected daily
with saline (PF), and untreated control dams (LC) were examined. Adul
t male rats 60 days old (P60) from the three prenatal groups were give
n either a 5-min forced swim test (FS), 10 min of intermittent foot sh
ock exposure, or were not exposed to either acute stressor. Amount of
immobility or inactivity during acute stress exposure was recorded. On
e day later, all animals were given a 5-min open field test. During bo
th of the acute stressors, C40 offspring exhibited significantly less
immobility than PF and LC control offspring. Whereas prior foot shock
experience enhanced the amount of immobility shown by LC and PF offspr
ing in the open field, similar immobility scores were observed between
shocked and nonstressed C40 rats. In contrast, prior foot shock exper
ience reduced locomotion in all prenatal treatment groups. These findi
ngs suggest that prenatal cocaine exposure results in altered behavior
al reactivity in terms of the immediate and delayed response to stress
ful experiences.