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Updated: Feb 25, 2026

A Simple Cell-based Immunofluorescence Assay to Detect Autoantibody Against the N-Methyl-D-Aspartate NMDA Receptor in Blood
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A Simple Cell-based Immunofluorescence Assay to Detect Autoantibody Against the N-Methyl-D-Aspartate NMDA Receptor in Blood

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Pathogen-mediated NMDA receptor autoimmunity and cellular barrier dysfunction in schizophrenia

G Kannan1,2, K L Gressitt3, S Yang3

  • 1Department of Psychiatry, Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Translational Psychiatry
|August 2, 2017
PubMed

Insights

Toxoplasma gondii infection is linked to N-methyl-D-aspartate receptor (NMDAR) antibodies and impaired barriers in schizophrenia. This association correlates with cognitive deficits, suggesting a specific disease subgroup.

Area of Science:

  • Neuroimmunology
  • Infectious Disease Immunology
  • Psychiatric Research

Background:

  • Autoantibodies targeting N-methyl-D-aspartate receptors (NMDAR) are implicated in schizophrenia's cognitive dysfunction.
  • Neurotropic pathogens can induce systemic inflammation and barrier defects, potentially triggering autoimmune responses.

Purpose of the Study:

  • To investigate the link between Toxoplasma gondii infection, NMDAR autoantibodies, and barrier integrity in schizophrenia.
  • To determine if T. gondii exposure and NMDAR antibodies contribute to cognitive impairment in schizophrenia.

Main Methods:

  • Utilized mouse models to assess the impact of T. gondii infection on NMDAR antibodies and barrier function (blood-gut, blood-brain).
  • Analyzed human cohorts for NMDAR IgG, T. gondii exposure, and barrier permeability markers, comparing schizophrenia patients with controls.
  • Assessed cognitive function, specifically delayed memory, in relation to T. gondii and NMDAR antibody seropositivity.

Main Results:

  • T. gondii infection in mice led to sustained NMDAR IgG and compromised blood-gut and blood-brain barriers.
  • In humans, T. gondii exposure and NMDAR IgG were associated with schizophrenia, independent of medication.
  • Schizophrenia patients with combined T. gondii and NMDAR antibody positivity exhibited greater cognitive impairment.

Conclusions:

  • T. gondii infection may contribute to schizophrenia pathophysiology through NMDAR autoantibody induction and barrier disruption.
  • Identifying NMDAR-related subgroups is crucial for targeted schizophrenia treatments.
  • These findings help reconcile conflicting reports on the role of NMDAR autoantibodies in schizophrenia.

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