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Related Experiment Videos

5'-Monodeiodinase activity in developing human cerebral cortex

M G Karmarkar1, D Prabarkaran, M M Godbole

  • 1Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi.

The American Journal of Clinical Nutrition
|February 1, 1993
PubMed
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Fetal brain development relies on thyroid hormones. Iodine deficiency alters enzymes in the fetal brain, potentially impacting thyroxine (T4) to triiodothyronine (T3) conversion during neurogenesis.

Area of Science:

  • Endocrinology
  • Developmental Biology
  • Neuroscience

Background:

  • Thyroid hormones are crucial for fetal brain development.
  • Iodine is essential for thyroid hormone synthesis.
  • The fetal brain's ability to regulate thyroid hormone levels is critical during neurogenesis.

Purpose of the Study:

  • To investigate the impact of iodine status on fetal thyroid hormone levels and metabolism in the brain.
  • To determine how maternal and fetal iodine status affects fetal cerebral cortex thyroid hormone content and enzyme activity.
  • To understand the adaptive mechanisms of the fetal brain to varying iodine availability.

Main Methods:

  • Assessed iodine status in aborted fetuses (11-25 weeks gestation) using maternal thyroid status and urinary iodine excretion.

Related Experiment Videos

  • Measured thyroxine (T4), 3,5,3'-triiodothyronine (T3), and reverse T3 (rT3) content in fetal cerebral cortex.
  • Quantified the activity of 5' and 5-monodeiodinase enzymes in the fetal cerebral cortex.

    • Main Results:

    • Fetal cerebral T4 and T3 peaked at 15-18 weeks gestation and declined in iodine sufficiency.
    • Mild iodine deficiency maintained higher T3 levels until week 22, but still lower than controls.
    • 5' and 5-monodeiodinase activities increased with gestation; 5' activity was enhanced in mild/moderate iodine deficiency, while 5-monodeiodinase activity decreased in moderate deficiency.

    Conclusions:

    • Fetal cerebral cortex enzyme activities are modulated by iodine deficiency to potentially enhance T3 production from T4.
    • These adaptations occur during neuroblastogenesis, suggesting a mechanism to support brain development under iodine stress.
    • The findings highlight the importance of adequate iodine status for optimal fetal brain development and thyroid hormone regulation.