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Correlations between major depressive disorder, splenic morphology, and immune function.

Zouqing Lin1, Xiaoyan Xu2, Kai Zhang3

  • 1The Affiliated Mental Health Center of Jiangnan University, Wuxi Central Rehabilitation Hospital, Wuxi, 214151, China. 34619599@qq.com.

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Summary

Major Depressive Disorder (MDD) patients show higher MICB levels and splenic volume. (S)-ketamine treatment reduced these markers, suggesting a role for spleen function in MDD pathogenesis.

Keywords:
(S)-ketamineMICBMajor depressive disorderSplenic morphology

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Area of Science:

  • Immunology
  • Neuroscience
  • Psychiatry

Background:

  • Major Depressive Disorder (MDD) is a complex psychiatric condition with debated underlying mechanisms.
  • Emerging research suggests a link between immune system dysregulation and MDD.
  • Morphological and functional changes in immune organs like the spleen may contribute to MDD pathophysiology.

Purpose of the Study:

  • To investigate the relationship between plasma MICB, ULBP1 levels, and splenic volume in patients with MDD.
  • To explore the effects of (S)-ketamine treatment on these parameters in MDD patients.
  • To elucidate the role of splenic immune mechanisms in MDD pathogenesis and treatment response.

Main Methods:

  • Recruitment of patients with first-episode or recurrent MDD and age/gender-matched healthy controls.
  • Baseline measurement of plasma MICB, ULBP1, and splenic volume.
  • Random assignment of MDD patients to (S)-ketamine or saline treatment groups.
  • Post-treatment assessment of MICB, ULBP1, and splenic volume after 4 weeks.

Main Results:

  • Patients with MDD exhibited significantly higher baseline plasma MICB and splenic volume compared to healthy controls.
  • A positive correlation was found between MICB levels and splenic volume in the MDD group.
  • (S)-ketamine administration led to a significant decrease in elevated splenic volume and MICB levels.

Conclusions:

  • Abnormal MICB expression and splenic morphology are implicated in the pathogenesis of MDD.
  • (S)-ketamine treatment may alleviate MDD symptoms by reducing inflammation and improving splenic function.
  • These findings highlight the spleen's role in MDD and suggest potential therapeutic targets.