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Updated: Jun 2, 2025

Behavioral and Network Pharmacology-Based Analyses for the Traditional Mongolian Medicine Zadi-5 in a Rat Model of Depression
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Behavioral and Network Pharmacology-Based Analyses for the Traditional Mongolian Medicine Zadi-5 in a Rat Model of Depression

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Unusual Phospholipids from Morganella morganii Linked to Depression

Sunghee Bang1, Yern-Hyerk Shin1, Sung-Moo Park2,3

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School and Blavatnik Institute, Boston, Massachusetts 02115, United States.

Journal of the American Chemical Society
|January 17, 2025
PubMed

Insights

Gut bacteria Morganella morganii may cause major depressive disorder (MDD) through unusual phospholipids. These compounds trigger inflammatory responses, potentially linking gut health to mental well-being.

Area of Science:

  • Microbiology
  • Immunology
  • Neuroscience

Background:

  • The gut microbiome composition is increasingly linked to various health conditions, including mental disorders.
  • Specific bacterial species and their metabolites are being investigated for their role in host immune system modulation.

Purpose of the Study:

  • To investigate the potential causal link between Morganella morganii in the gut and major depressive disorder (MDD).
  • To identify bacterial metabolites responsible for pro-inflammatory immune responses associated with MDD.

Main Methods:

  • A multifactorial association study was conducted to explore the connection between M. morganii prevalence and MDD incidence.
  • Bioassay-guided fractionation was employed to isolate and characterize bacterial metabolites.
  • Immune response assays, including TLR2/TLR1 activation and cytokine production (IL-6), were performed.

Main Results:

  • A probable causal link was found between M. morganii gut colonization and MDD.
  • Unusual phospholipids, termed chimeric cardiolipins, were identified as key bacterial metabolites.
  • These metabolites activate TLR2/TLR1 receptors, inducing pro-inflammatory cytokine production, particularly IL-6, similar to conventional cardiolipins.

Conclusions:

  • The identified chimeric cardiolipins produced by M. morganii are potent immune activators.
  • These findings suggest a novel molecular mechanism connecting gut dysbiosis and MDD through specific bacterial metabolites.
  • The study has broader implications for understanding inflammatory conditions beyond MDD.

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