A study published on 26 May 2017 in the Journal of Allergy and Clinical Immunology has found that taking Vitamin D supplements in pregnancy can positively modify the immune system of the newborn baby, which could help to protect against asthma and respiratory infections, a known risk factor for developing asthma in childhood.
The team of researchers from King’s College London looked at the effect that taking a supplement of 4,400 IU vitamin D3 per day during the second and third trimesters of pregnancy versus the recommended daily intake (RDI) of 400 IU/day, had on the immune system of the newborn.
Participants were randomised at 10 – 18 weeks of pregnancy to high or low doses of vitamin D supplements. The team then took umbilical cord bloods from 51 pregnant women to test the responsiveness of the newborn’s innate immune system, which form the body’s first line of defence to infection, and T lymphocyte responses, which provide longer-lasting protection.
They found that blood samples from babies born to mothers supplemented with higher vitamin D3 responded to mimics of pathogen stimulation by greater innate cytokine responses and greater IL-17A production in response to T lymphocyte stimulation. Both types of response are predicted to improve neonatal defence to infection. Given the evidence for strong immune responses in early life being associated with decreased development of asthma, the team believe the effect will likely lead to improved respiratory health in childhood.
‘The majority of all asthma cases are diagnosed in early childhood implying that the origin of the disease stems in foetal and early life,’ said lead researcher, Professor Catherine Hawrylowicz from King’s College London.