Immunomodulatory Effects of Transfusions on Maternal Immunity in Pregnancy
Pregnancy represents a unique immunological state where maternal immune adaptations play a pivotal role insupporting fetal development while maintaining tolerance to the semi-allogeneic fetus. Blood transfusions, oftennecessary during pregnancy for various medical conditions, present an intriguing avenue for understandingalterations in maternal immunity. This comprehensive review aims to elucidate the intricate immunomodulatoryeffects of blood transfusions on maternal immunity during pregnancy. Beginning with an exploration of normalimmunological changes in pregnancy, this review navigates through the immunomodulatory challenges posed byblood transfusions. The impact of donor factors, transfusion-related immunological components, and their influence on the maternal immune system are scrutinized. Mechanistic insights into altered cytokine responses, adaptiveimmune changes, and the role of regulatory T cells post-transfusion form critical focal points. Clinically, discerningthe implications of altered maternal immunity on fetal, neonatal health, and obstetric outcomes is essential.Assessing risks and benefits associated with transfusions in pregnancy further underscores the clinical relevance ofunderstanding these immunomodulatory effects. Despite advancements, this review acknowledges research gapsand limitations, highlighting the need for future investigations. Recommendations for prospective studies andpotential clinical implications conclude this review, emphasizing the significance of comprehendingimmunomodulation in maternal immunity post-transfusion for optimizing maternal-fetal health. In conclusion, thisreview encapsulates current knowledge, challenges, and future directions in comprehending the complex interplaybetween blood transfusions and maternal immune responses during pregnancy, offering valuable insights into acrucial aspect of perinatal medicine.Keywords: blood transfusions; maternal immunity; pregnancy; immunomodulation; cytokines; alloimmunization;inflammation; transplacental immunomodulation