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Stress in Neonatal Rats with Different Maternal Care Backgrounds: Monoaminergic and Hormonal Responses
T P Henriques1, R E Szawka, L A Diehl
1Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Sarmento Leite, 500, Porto Alegre, Rio Grande do Sul, 90050-170, Brazil, henriques.tp@gmail.com.
Neurochemical Research
|September 28, 2014
Summary
High-quality maternal care in rats enhances oxytocin and hippocampal serotonin levels, influencing stress responses during early development. This highlights the critical impact of early life experiences on neurobiological outcomes.
Area of Science:
- Neuroscience
- Developmental Biology
- Endocrinology
Background:
- Early life in rats (first 2 weeks) is a stress hyporesponsive period, yet critical for development.
- Infant rats are susceptible to environmental factors like stress and maternal care quality.
- Early life events significantly shape long-term stress responsivity and adult phenotype.
Purpose of the Study:
- To investigate the impact of maternal care quality (high vs. low licking) and sex on rat pup responses to aversive stimuli.
- To analyze neurochemical changes in response to cold stress in early life.
Main Methods:
- Analysis of plasma corticosterone and oxytocin levels in 13-day-old rat pups.
- Assessment of central monoaminergic activity (dopamine, serotonin) in stressed pups.
- Comparison between pups from high licking (HL) and low licking (LL) mothers.
Main Results:
- Cold stress elevated plasma corticosterone and marginally decreased hypothalamic DOPAC/DA ratio.
- HL pups exhibited significantly higher plasma oxytocin levels compared to LL pups.
- Maternal care influenced hippocampal 5-HIAA/5-HT ratio, which was increased in HL pups, irrespective of sex and stress.
Conclusions:
- Maternal care quality significantly impacts early neuroendocrine and neurochemical profiles in rat pups.
- Enhanced maternal care is associated with higher oxytocin and altered hippocampal serotonin turnover.
- Understanding these early life influences is crucial for comprehending neurodevelopmental trajectories and potential psychopathology.
