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Brain-corticosteroid hormone dialogue: slow and persistent

E R de Kloet1, N Y Rots, A R Cools

  • 1Division of Medical Pharmacology, Leiden/Amsterdam Center for Drug Research (LACDR), Leiden University, The Netherlands.

Cellular and Molecular Neurobiology
|June 1, 1996
PubMed
Summary

Early life stress and genetics shape the stress response system. Maternal deprivation in rats impacts dopamine, corticosterone receptors, and neuroendocrine regulation, influencing adult behavior and psychopathology risk.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Behavioral Science

Background:

  • The stress response system is influenced by both genetic predisposition and early life experiences.
  • Neonatal life events, particularly maternal deprivation, can have lasting effects on stress system development.
  • Corticosterone (CORT) is a key hormone in mediating endocrine and behavioral adaptations to stress, acting via mineralocorticoid (MR) and glucocorticoid receptors (GR).

Purpose of the Study:

  • To investigate the interplay between genetic factors and early life experiences on the stress response system.
  • To examine the long-term consequences of neonatal maternal deprivation on dopamine phenotype, CORT receptor dynamics, and neuroendocrine regulation.
  • To establish a framework for understanding dopamine-related psychopathology in the context of genetic and environmental influences.

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Main Methods:

  • Utilized rat lines selectively bred for extreme dopamine phenotypes.
  • Exposed infant rats to prolonged maternal deprivation (24 hours) to disrupt the stress hyporesponsive period.
  • Assessed the impact of these factors on corticosterone receptor dynamics and neuroendocrine regulation in adult life.

Main Results:

  • Neonatal maternal deprivation disrupts the stress hyporesponsive period and leads to inappropriate corticosterone elevation.
  • Early life exposure to corticosterone and sensory stimulation has long-lasting organizational effects on the stress response system.
  • Mother-pup interactions critically influence dopamine phenotype, corticosterone receptor regulation, and neuroendocrine function in adulthood.

Conclusions:

  • Genetic background and early life events, specifically maternal care, are crucial determinants of adult stress system function.
  • These findings provide a conceptual model for studying the neurobiological underpinnings of psychopathology, integrating genetic, environmental, and hormonal factors.
  • Understanding these interactions is vital for developing targeted interventions for stress-related disorders.