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Related Experiment Videos

Adrenal and thyroid axis function in preterm ventilated baboons.

Alan H Jobe1, Susan M Scott, Daniel H Polk

  • 1Division of Pulmonary Biology, Cincinnati Children's Hospital, Cincinnati, Ohio 45229-3039, USA. alan.jobe@chmcc.org

Biology of the Neonate
|March 28, 2003
PubMed
Summary
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Preterm baboons show immature hypothalamic-pituitary-adrenal (HPA) axis function, with cortisol responses delayed until 11 days after birth. Thyroid hormone (T4) treatment suppressed these cortisol responses and subsequent T4 levels.

Area of Science:

  • Endocrinology
  • Neonatal Physiology
  • Comparative Medicine

Background:

  • Cortisol and thyroid hormones are vital for fetal development and neonatal adaptation.
  • Preterm birth often leads to abnormal hormone levels and responses.
  • Understanding hormonal responses in preterm neonates is crucial for clinical management.

Purpose of the Study:

  • To assess the hypothalamic-pituitary-adrenal (HPA) and thyroid axes' response to stimulation in preterm baboons.
  • To evaluate hormonal responses independent of uncontrolled antenatal events.
  • To investigate the impact of antenatal betamethasone and postnatal thyroxine (T4) treatment.

Main Methods:

  • Preterm baboons delivered at 125 days gestation underwent ACTH, CRH, and TRH stimulation tests.

Related Experiment Videos

  • Animals received surfactant treatment and ventilation for up to 14 days.
  • Hormonal responses (cortisol, T4) were measured following various stimulation protocols.

    • Main Results:

    • Baseline cortisol levels were elevated, indicating stress, by day 5.
    • Consistent cortisol increase occurred only after 11 days in response to high-dose CRH or ACTH.
    • Postnatal T4 treatment suppressed cortisol responses and lowered baseline T4 levels.

    Conclusions:

    • The HPA axis is immature in preterm baboons, showing unresponsiveness to standard stimulation until 11 days of age.
    • Thyroxine treatment can influence both the HPA axis and thyroid hormone levels in preterm neonates.
    • This study provides insights into hormonal development and response in a preterm primate model.