Cross-Generational Effect
of Prenatal Morphine Exposure on Neurobehavioral Development of
Rat Pups
R. ŠLAMBEROVÁ1, 3, M.A. RILEY2, I. VATHY1, 2
Departments of 1Psychiatry and Behavioral Sciences,
2Neuroscience, Albert Einstein College of Medicine, Bronx, NY,
USA and 3Department of Normal, Pathological and Clinical
Physiology, Third Faculty of Medicine, Charles University,
Prague, Czech Republic
Received November 30, 2004
Accepted February 2, 2005
On-line available February 16, 2005
Summary
Prenatal exposure to opiates can have devastating effects on the
development of human fetuses and may induce long-term physical
and neurobehavioral changes during postnatal maturation. The
present study was aimed at identifying cross-generational
effects of prenatal morphine exposure in Sprague-Dawley rats.
Pregnant rats were injected subcutaneously with either saline or
morphine (10 mg/kg) twice daily during gestational days 11-18.
Litter size, percentage of males and females, anogenital
distances (AGDs), righting reflex, and body weight were assessed
in prenatally morphine-exposed pups (first generation) and their
offspring (second generation). Both prenatally morphine-exposed
pups and offspring of prenatally morphine-exposed dams exhibited
an increased latency to right. Additionally, second generation
pups were slower in righting than first generation pups. During
the early postnatal period the second generation pups weighed
less than the first generation regardless of drug exposure. The
AGDs of second generation male pups were decreased relative to
the first generation. Our data provide important novel
information about the trans-generational effects of maternal
opiate abuse that may be useful for understanding/evaluating the
teratogenic effects of prenatal opiate exposure.
Key words
Prenatal morphine exposure • Generational difference •
Neurobiological development
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