alexa Opiate withdrawal in the fetal rat: a behavioral profile.


Journal of Addiction Research & Therapy

Author(s): Jones KL, Barr GA

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Abstract Offspring of women exposed to opiate drugs such as heroin and methadone during pregnancy have a high incidence of morbidity and mortality. Infants also show opiate withdrawal. In this study, we examined the behavioral effects of precipitated withdrawal in morphine-dependent fetal rats at gestational day (GD) 20. The dam was implanted on GD 14 with a pellet containing 75.0 mg of morphine. On GD 20, the dam underwent chemoyelotomy at L1/L2. The uterine horns were externalized and four subject fetuses were selected for behavioral observation, two from each uterine horn. The fetus was then injected subcutaneously with either saline or naltrexone (1.0 mg/kg) and the behaviors of the fetus recorded every 15 sec for 20 min. The results show that naltrexone injected fetuses that had been chronically exposed to morphine demonstrated increased limb and mouth movements, face wiping, and body curls, and spent less time quiet as compared with control fetuses. These results indicate that a morphine withdrawal-like syndrome occurs in the fetal rat.
This article was published in Pharmacol Biochem Behav and referenced in Journal of Addiction Research & Therapy

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