Cited by 95Prenatal Substance Exposure EffectsPharmacological Effects and Toxicity StudiesBirth, Development, and Health

Prenatal cocaine and/or nicotine exposure in rats: Preliminary findings on long-term cognitive outcome and genital development at birth

Cutler, A·1996·Neurotoxicology and Teratology

Abstract

Prenatal cocaine or nicotine exposure is associated with a variety of teratogenic effects. The current study was conducted to determine their effects alone and in combination on cognitive function and sexual differentiation. Pregnant Long-Evans rats (N = 19) were exposed to either cocaine (15 mg/kg/dose b.i.d. SC on GD 8-20); nicotine (4 mg/kg/day continuous SC infusion on GD 4-20); both nicotine + cocaine; or vehicle only. Birth weight and anogenital distance (AGD) were measured in all pups at birth. Learning and memory were tested in the Morris water maze (MWM) during prepubertal and pubertal ages in five daily consecutive sessions and a sixth session 1 week later and in the radial-arm maze (RAM) during adulthood. In the RAM, a drug challenge of the beta-noradrenergic antagonist propranolol (10-20 mg/kg) was given after acquisition training. Maternal weight gain was reduced 13-42% and offspring birth weight was reduced by 7-12% in all three exposure groups compared to controls. Cocaine decreased the AGD of males (2.68 mm) compared to 2.88 mm in noncocaine-exposed male pups (p < 0.025). A sex-selective cocaine effect was also seen after adjustment of AGD measurements for body weight. With this measure cocaine-treated females showed significantly (p < 0.05) greater AGD than those not exposed to cocaine. In the MWM, there were two types of trials: cued reference memory trials and uncued spatial working memory trials. On cued reference memory trials significant cocaine-induced latency deficits were seen on only the first session. On spatial working memory trials cocaine-induced latency deficits were seen throughout daily training on sessions 1-5, but not the retention session 6, 1 week later. During RAM acquisition, there were no significant differences in choice accuracy between exposure groups. Following propranolol challenge, deficits in choice accuracy were demonstrated in rats prenatally exposed to cocaine or nicotine. These rats did not show any response to propranolol, whereas the controls slightly improved their choice accuracy. The results of this study indicated that prenatal cocaine exposure altered long-term cognitive function under basal conditions in the MWM and drug challenge in the RAM, birth weight, and genital development. Cocaine-induced cognitive deficits were predominately in working memory rather than reference memory or long-term retention. Prenatal nicotine exposure was only observed to alter birth weight and cognitive function in response to propranolol challenge in the RAM.

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Authors
Cutler, A.
Affiliations
Duke University (US)
Corresponding author
Cutler, A
Venue
Neurotoxicology and Teratology
Publisher
Elsevier BV
Published
1996-12
Volume
18
Issue
6
Pages
635-643
ISSN
0892-0362 (ISSN-L)
OpenAlex
W2030018755
Cited by
95
References
53
Citations by year
2025: 1 · 2024: 1 · 2022: 3 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 6 · 2016: 3 · 2015: 2 · 2014: 3 · 2013: 5 · 2012: 3
FWCI
4.16
Type
journal article
Language
en
Open access
closed
Locations
  • Neurotoxicology and Teratology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Prenatal Substance Exposure Effects
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Pharmacological Effects and Toxicity Studies
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Birth, Development, and Health
Keywords
prenatal cocaine exposure, prenatal nicotine exposure, teratogenicity, sexual differentiation, anogenital distance, birth weight, cognitive impairment, spatial working memory, reference memory, beta-adrenergic receptors, gestational weight gain, Long-Evans rats, learning and memory, radial maze, Morris water maze
MeSH terms
Abnormalities, Drug-Induced, Aging, Analysis of Variance, Animals, Anal Canal, Birth Weight, Cocaine, Cognition, Female, Litter Size, Male, Memory, Nicotine, Penis, Pregnancy, Prenatal Exposure Delayed Effects, Propranolol, Sex Differentiation, Sexual Maturation, Sex Ratio, Teratogens, Vagina, Maze Learning, Rats

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