Researchers found potential causal relationships between different leukocyte subsets of the maternal immune system and neonatal disorders, including hemolytic disease of the fetus and newborn (HDFN), according to a Mendelian randomization study recently published in Mediators of Inflammation.
These disorders, driven by immune cell dysregulation, showed a significant connection to preterm birth. The researchers studied 446 leukocyte features and subsets, or a group of white blood cells that share similar characteristics.
A “successful pregnancy” depends on the delicate equilibrium of the maternal immune system, with the concomitant guarantee of tolerance to the semi-allogeneic fetus and adequate protection from pathogenic invasion. In order to sustain this balance, coordinated changes in a variety of leukocyte subsets must occur.
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In the current two-sample Mendelian randomization study, the researchers sought “to explore whether exposure demonstrates a causal association with disease occurrence.” Results of the study revealed significant causal associations between a total of 301 leukocyte subsets and seven adverse fetal outcomes:
- Fetal growth restriction (FGR)
- Preterm birth (PTB)
- Neonatal jaundice (NNJ)
- Digestive system disorders of the fetus and newborn
- HDFN
- Respiratory distress of the newborn
- Transitory disorders of metabolism specific to the fetus and newborn
The study also underscored the possibility of pathogenic mechanisms underlying the mutual causality among neonatal disorders. Mendelian randomization findings denoted FGR as a robustly correlated risk factor for PTB and NNJ. Further, a reciprocal causal relationship between NNJ and FGR was observed. In addition, PTB was identified as a risk factor for HDFN.
“Offering a comprehensive perspective on the impact of the immune system during maternal pregnancy on neonatal diseases, the study provided fresh insights for the early diagnosis and treatment of related conditions,” the authors concluded.
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