Causal relationships between immune cells, inflammatory factors, and preeclampsia: A two-step, two-sample mendelian...

Area of Science:

• Immunology
• Genetics
• Obstetrics

Background:

• Preeclampsia (PE) is a pregnancy disorder linked to immune system dysfunction.
• The precise roles of immune cells and inflammatory mediators in PE pathogenesis are not fully understood.

Purpose of the Study:

• To investigate the causal impact of immune cell traits on preeclampsia risk.
• To explore the potential mediation effects of inflammatory factors in this relationship.

Main Methods:

• Utilized a two-sample, two-step Mendelian randomization (MR) analysis.
• Employed the inverse-variance weighted method as the primary analytical approach.
• Assessed mediation effects of specific inflammatory factors.

Main Results:

• Identified 22 immune cell traits with protective effects and 19 with increased PE risk.
• Found four inflammatory factors potentially linked to PE.
• Mediation analysis indicated that the absolute count of CD33+ HLA-DR+ cells (including CD14- subset) causally relates to PE, partly mediated by STAM-binding protein levels.

Conclusions:

• Established a causal link between specific immune cells and PE.
• Highlighted the role of inflammatory factors, such as STAM-binding protein, in PE pathogenesis.
• Emphasized the need for further validation in diverse populations.