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Related Concept Videos

Biological Causes of Schizophrenia01:29

Biological Causes of Schizophrenia

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Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
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Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders01:27

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Schizophrenia is a neurodevelopmental disorder whose origins are rooted in complex genetic components. Despite our burgeoning understanding, the pathophysiology of this disorder remains incompletely deciphered.
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Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
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Peripheral BDNF Levels in Individuals at Ultra-High Risk for Psychosis: A Systematic Review.

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  • 1Escuela de Medicina, Facultad de Medicina, Universidad de Chile, Santiago 8380453, Chile.

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Summary
This summary is machine-generated.

Peripheral Brain-Derived Neurotrophic Factor (BDNF) levels in individuals at ultra-high risk for psychosis show inconsistent results. Current evidence does not support its use as a prognostic biomarker due to heterogeneity and small sample sizes.

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brain-derived neurotrophic factorfirst-episode psychosisperipheral biomarkersschizophreniaultra-high risk

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Biomarker Research

Background:

  • Brain-derived neurotrophic factor (BDNF) is crucial for brain function, with altered levels linked to psychotic disorders.
  • Peripheral BDNF levels in individuals at ultra-high risk (UHR) for psychosis require further investigation due to inconsistent findings.
  • This review examines BDNF levels in UHR populations compared to healthy controls (HC), first-episode psychosis (FEP), and chronic schizophrenia (CS).

Purpose of the Study:

  • To synthesize evidence on peripheral BDNF levels in UHR individuals.
  • To compare BDNF levels across UHR, HC, FEP, and CS groups.
  • To assess BDNF's potential as a biomarker for psychosis risk and clinical course.

Main Methods:

  • Systematic literature search of PubMed, Scopus, and Web of Science.
  • Inclusion of 8 studies reporting baseline peripheral BDNF levels.
  • Narrative synthesis of findings due to clinical and methodological heterogeneity.

Main Results:

  • Inconsistent findings regarding peripheral BDNF levels in UHR individuals compared to control groups.
  • Some studies reported lower BDNF in UHR, while others found no difference or higher levels.
  • Longitudinal analyses did not consistently demonstrate prognostic value for BDNF.

Conclusions:

  • Current evidence on peripheral BDNF in UHR individuals is inconsistent and limited by small sample sizes and methodological heterogeneity.
  • Peripheral BDNF is not currently supported as a prognostic biomarker for psychosis.
  • Larger, standardized studies are needed to clarify BDNF's potential role in a biomarker framework for psychosis risk.