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Related Experiment Video

Updated: Jan 9, 2026

Generating a Reproducible Model of Mid-Gestational Maternal Immune Activation using PolyI:C to Study Susceptibility and Resilience in Offspring
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Causal Relationship between Immune Cells and Postpartum Depression: A Bidirectional Two-Sample Mendelian

Yingjia Zhu1, Feng Cheng2, Wenhui Wang3

  • 1Department of Gynecology, Hangzhou Women's Hospital, Hangzhou, Zhejiang, 310000, China.

Iranian Journal of Public Health
|December 8, 2025
PubMed
Summary
This summary is machine-generated.

Genetic analysis reveals 28 immune cell types causally linked to postpartum depression (PPD). Some immune cells increase PPD risk, while others offer protection, guiding future PPD treatments.

Keywords:
Causal inferenceGenetic variationImmune cellsMendelian randomizationPostpartum depression

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Area of Science:

  • Immunology
  • Genetics
  • Psychiatry

Background:

  • Postpartum depression (PPD) is influenced by immune factors, with a particular focus on immune cells.
  • The precise causal relationship between specific immune cells and PPD remains unclear.

Purpose of the Study:

  • To investigate the causal relationship between immune cell characteristics and the risk of developing postpartum depression (PPD).
  • To identify specific immune cell types that may influence PPD susceptibility through genetic analysis.

Main Methods:

  • Utilized bidirectional two-sample Mendelian randomization (TSMR) analysis.
  • Employed the inverse variance weighted (IVW) method as the primary analytical approach.
  • Conducted comprehensive sensitivity analyses to assess result robustness, heterogeneity, and potential horizontal pleiotropy.

Main Results:

  • Identified 28 immune cell phenotypes causally associated with PPD onset, predominantly within B cell and regulatory T (Treg) cell populations.
  • Found that 13 immune cell types promote PPD development, while 15 immune cell types exhibit a protective effect.
  • Established a causal link between PPD incidence and CD62L expression on granulocytes (OR: 1.183, P=0.012).

Conclusions:

  • The study establishes a genetic basis for the causal link between immune cells and postpartum depression susceptibility.
  • Findings offer novel insights for developing targeted therapies and precision medicine approaches for PPD treatment.