Iron homeostasis during pregnancy.

Area of Science:

• Obstetrics and Gynecology
• Hematology
• Nutritional Science

Background:

• Pregnancy significantly increases iron demands for fetal development and maternal physiological changes.
• Iron homeostasis during pregnancy relies on dietary absorption and mobilization from stores, regulated by hepcidin.
• Maternal hepcidin is suppressed in the second and third trimesters, but the mechanism remains unclear.

Purpose of the Study:

• To review current knowledge on gestational changes in hematologic and iron variables.
• To explore regulatory aspects of maternal, fetal, and placental iron homeostasis during pregnancy.
• To identify gaps in understanding hepcidin's role in pregnancy-related iron metabolism.

Main Methods:

• Literature review of studies on pregnancy, iron metabolism, and hepcidin.
• Analysis of hepcidin regulation by known stimuli (iron, erythropoiesis, inflammation) during gestation.
• Examination of maternal, fetal, and placental iron transfer mechanisms.

Main Results:

• Maternal hepcidin concentrations are suppressed in mid-to-late pregnancy, facilitating iron availability.
• Hepcidin regulation by established factors appears preserved despite pregnancy.
• Inappropriately high hepcidin can hinder iron transfer and supplementation efficacy.

Conclusions:

• The suppression of maternal hepcidin during pregnancy is essential for adequate iron supply but its mechanism is unknown.
• Fetal hepcidin's role in placental iron transfer requires further investigation.
• Understanding these regulatory aspects is vital for managing iron status in pregnant individuals.