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Schizophrenia: Basic and Clinical.

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Schizophrenia involves brain changes like cortical atrophy and synapse loss, impacting cognition and negative symptoms. Targeting NMDA receptor hypofunction shows promise for treating these debilitating aspects of schizophrenia.

Keywords:
CognitionCortical atrophyGABAergic interneuronsGlutamateNMDA receptorNegative symptomsPsychosisSchizophrenia

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Genetics

Background:

  • Schizophrenia is a chronic mental disorder with psychosis, cognitive, and social deficits.
  • Cortical volume loss and synaptic deficits, particularly glutamatergic, are key pathological features.
  • Current antipsychotics primarily manage psychosis, with limited efficacy for cognitive and negative symptoms.

Purpose of the Study:

  • To explore the pathophysiology of schizophrenia, focusing on NMDA receptor hypofunction.
  • To investigate the role of D-serine and serine racemase in schizophrenia-related pathology.
  • To identify potential therapeutic targets for cognitive and negative symptoms.

Main Methods:

  • Review of pharmacologic challenge studies, postmortem analyses, and genetic studies (GWAS, CNV).
  • Analysis of D-serine synthesis pathway and its impact on neuronal function.
  • Examination of mouse models with altered serine racemase activity.

Main Results:

  • NMDA receptor hypofunction is a significant pathophysiological feature of schizophrenia.
  • Reduced D-serine availability, due to serine racemase gene alterations, mimics schizophrenia pathology in mice.
  • This includes dendritic and GABAergic deficits and cognitive impairments.

Conclusions:

  • NMDA receptor hypofunction contributes to cognitive and negative symptoms in schizophrenia.
  • Strategies aimed at enhancing NMDA receptor function hold therapeutic potential.
  • Targeting the D-serine pathway offers a promising avenue for treating schizophrenia's persistent symptoms.