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Updated: Aug 6, 2026
Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale
Published on: August 25, 2014
Caffeine: effects of acute and chronic exposure on the behavior of neonatal rats
Insights
Neonatal rats exposed to caffeine showed increased activity and disrupted behaviors. These findings highlight the use of behavioral assessments for detecting early-life exposure to toxic substances.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Neonatal behavioral responses are crucial indicators of development.
- Assessing the impact of early-life exposure to stimulants like caffeine is important for understanding potential long-term effects.
- Standardized behavioral tests in neonatal rodents can reveal subtle neurodevelopmental changes.
Purpose of the Study:
- To investigate the behavioral effects of caffeine, a central nervous system stimulant, on 1- and 10-day-old rat pups.
- To determine if caffeine exposure during gestation or early lactation alters neonatal behavior and responses to acute caffeine challenges.
- To evaluate the utility of specific neonatal behaviors for detecting chemically induced alterations.
Main Methods:
- Behavioral responses of 1- and 10-day-old rat pups to acute caffeine administration were observed.
- Key behaviors assessed included activity levels, attachment latencies, weight gain, and suckling frequencies.
- Long-term effects of gestational or lactational caffeine exposure were examined, along with responses to subsequent acute caffeine challenges.
- Theophylline was used as a control to confirm caffeine-specific effects.
Main Results:
- Caffeine increased activity and attachment latencies while decreasing weight gain and attachment frequencies in both age groups.
- Home orientation was disrupted in 10-day-old pups exposed to caffeine.
- Long-term caffeine exposure altered baseline activity levels and the response to acute caffeine challenges.
- Theophylline did not produce similar behavioral changes, indicating caffeine-specific effects.
Conclusions:
- Biologically relevant behaviors in neonatal rats are sensitive indicators of prenatal and early postnatal exposure to toxic substances like caffeine.
- Behavioral assessments provide a valuable method for evaluating the neurodevelopmental impact of early-life chemical exposures.
- Caffeine exposure during critical developmental windows can lead to persistent alterations in behavior and reactivity.
Abstract:
The behavioral responses of 1- and 10-day-old rats to caffeine, a central nervous system stimulant, were determined using several behaviors readily exhibited by the neonatal rat. In pups of both ages activity as well as attachment latencies in the on-nipple suckling test increased, while weight gain and attachment frequencies in on-mother and on-nipple suckling tests decreased. In addition, the home orientation of 10-day-old rats was disrupted. Similar effects were found in 1-day-old pups exposed to theophylline. Long term exposure to caffeine during gestation (1-day-old pups) or on days 1--9 of lactation (10-day-old pups) increased the pups' activity levels and altered the activity increase observed following an acute caffeine challenge. The absence of a differential response to theophylline indicated these changes were specific to caffeine. These results indicate that biologically relevant behaviors can be used to assess behavioral alterations in the neonate which arise from prenatal or early postnatal exposure to toxic substances.
