Prenatal vitamin D deficiency exposure leads to long-term changes in immune cell proportions

Area of Science:

• Immunology
• Developmental Biology
• Nutritional Science

Background:

• Vitamin D deficiency is prevalent globally, especially in women of reproductive age.
• Prenatal exposure to vitamin D deficiency can elevate offspring's risk for immune-related diseases later in life.
• Mechanisms by which the body 'remembers' developmental environmental exposures are not well understood.

Purpose of the Study:

• To investigate the long-term effects of prenatal vitamin D deficiency on offspring's immune cell composition.
• To explore the molecular pathways involved in the immune system's memory of prenatal vitamin D status.
• To correlate maternal vitamin D levels during pregnancy with cord blood immune cell profiles.

Main Methods:

• Utilized vitamin D deficient mice created through dietary manipulation to model prenatal deficiency.
• Analyzed immune cell proportions in offspring (both fetal and adult) from deficient dams.
• Examined gene expression changes downstream of vitamin D receptor signaling in hematopoietic stem and progenitor cells.
• Correlated maternal vitamin D levels in the second trimester with cord blood immune cell profiles in 75 human pregnancies.

Main Results:

• Prenatal vitamin D deficiency significantly altered immune cell proportions in offspring mice.
• These alterations were linked to changes in the transcriptional properties of genes regulated by vitamin D receptor signaling in hematopoietic stem and progenitor cells.
• Maternal vitamin D levels during the second trimester were significantly associated with specific immune cell proportions in term offspring.

Conclusions:

• Prenatal vitamin D deficiency can induce lasting changes in the developing immune system.
• Hematopoiesis differentiation properties may serve as a long-term memory of prenatal vitamin D exposure.
• Maintaining adequate maternal vitamin D levels during pregnancy is crucial for offspring immune health.