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Related Experiment Videos

Developmental consequences of oxytocin.

C Sue Carter1

  • 1Department of Psychiatry, Brain-Body Center, University of Illinois at Chicago, Chicago, IL 60612, USA. scarter@psych.uic.edu

Physiology & Behavior
|September 5, 2003
PubMed
Summary
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Early exposure to oxytocin (OT) in neonates has lifelong effects on social behaviors and stress responses. These developmental impacts of OT are often sexually dimorphic, influencing adult pair bonding and parental care.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Endocrinology

Background:

  • Oxytocin (OT) is a key neuropeptide in adult mammals, regulating social behaviors, stress responses, and the hypothalamic-pituitary-adrenal (HPA) axis.
  • Neonates can be exposed to maternal hormones, but the influence of these peptides on infant development is not fully understood.
  • Endogenous oxytocin synthesis begins in the early postnatal period in rodents, with largely unknown functions at this stage.

Purpose of the Study:

  • To investigate the developmental effects of oxytocin (OT) in neonatal mammals.
  • To determine if early-life OT exposure has lasting consequences on social behaviors and HPA axis reactivity.
  • To explore potential sex differences in the effects of neonatal OT exposure.

Main Methods:

Related Experiment Videos

  • Experiments were conducted on neonatal prairie voles.
  • Administration of oxytocin (OT) and OT receptor antagonists to neonates.
  • Assessment of long-term effects on social behaviors (pair bonding, parental care) and HPA axis reactivity in adulthood.
  • Analysis of sexually dimorphic outcomes.

    • Main Results:

    • Neonatal exposure to OT and OT receptor antagonists resulted in immediate and lifelong changes in social behaviors.
    • These effects included alterations in adult pair bonding and parental behaviors.
    • HPA axis reactivity was also significantly impacted, with most observed effects showing sexual dimorphism.
    • Possible mechanisms involve long-lasting alterations in oxytocin and vasopressin systems.

    Conclusions:

    • Early-life oxytocin signaling critically influences the development of social behaviors and stress regulation.
    • The effects of neonatal oxytocin are profound, leading to enduring changes into adulthood.
    • Sexual dimorphism plays a significant role in mediating the long-term consequences of early oxytocin exposure.