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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Related Experiment Video

Updated: Dec 31, 2025

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T-cell defects and postpartum depression.

Lauren M Osborne1, Janneke Gilden2, Astrid M Kamperman2

  • 1Department of Psychiatry & Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Gynecology & Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Brain, Behavior, and Immunity
|January 12, 2020
PubMed
Summary

Women with postpartum depression show reduced T-cell activity compared to healthy controls. This study highlights potential immune system differences in postpartum mood disorders, warranting further investigation into T-cell function.

Keywords:
DepressionImmuneMoodPostpartumPregnancyT cells

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Area of Science:

  • Immunology
  • Neuroscience
  • Women's Health

Background:

  • Perinatal mood disorders are often linked to immune system changes.
  • Previous research on non-perinatal mood disorders suggests T-cell defects.
  • This study specifically investigates T-cell subtypes in postpartum depression.

Purpose of the Study:

  • To characterize T-cell subtype proportions in women experiencing postpartum depression.
  • To compare T-cell profiles between women with postpartum depression, healthy postpartum controls, and non-postpartum controls.

Main Methods:

  • Flow cytometry was used to analyze blood samples.
  • Participants included 21 women with postpartum depression, 39 healthy postpartum controls, and 114 non-postpartum controls.
  • Statistical analyses, including linear regression, were performed to identify differences in T-cell populations.

Main Results:

  • Healthy postpartum women exhibited significantly increased T-cell counts (CD3+, CD4+, CD8+) compared to non-postpartum controls.
  • These increases in healthy women were attributed to elevated TH1 and T regulatory cells.
  • Women with postpartum depression did not display the same physiological T-cell enhancements, with some populations showing decreases.

Conclusions:

  • The postpartum period is characterized by heightened T-cell activity in healthy women.
  • Women with postpartum depression lack this typical postpartum T-cell immune response.
  • Further research is required to understand the causes and implications of these T-cell differences in postpartum depression.