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Depression: Overview

Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...

Long-term Depression

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Long-term Depression

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Gut-Brain Axis

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Depressive Disorders: Etiology

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Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
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Brain Imaging

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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
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Major Depression and Brain-Derived Neurotrophic Factor.

Reiji Yoshimura^1,2

¹Emeritus Professor of University of Occupational and Environmental Health, Japan.

Journal of UOEH

|June 3, 2026

Summary

This summary is machine-generated.

Brain-derived neurotrophic factor (BDNF) shows promise as a biomarker for depression, with its levels and genetic variations linked to severity and treatment. Future research aims to integrate BDNF analysis for personalized depression care.

Keywords:

biomarker brain-derived neurotrophic factor major depression polymorphism precision medicine

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Area of Science:

Neuroscience
Psychiatry
Genetics

Background:

Depression exhibits significant biological and psychosocial heterogeneity, complicating biomarker identification.
Brain-derived neurotrophic factor (BDNF) is implicated in depression, with blood levels, genetic variations, and cerebrospinal fluid concentrations correlating with disease status and treatment outcomes.

Purpose of the Study:

To explore the role of BDNF and its related pathways in depression.
To investigate the potential of BDNF as a diagnostic and prognostic biomarker for depression.
To examine the influence of BDNF genetic polymorphisms and epigenetic modifications on treatment response.

Main Methods:

Analysis of blood levels, genetic polymorphisms, and cerebrospinal fluid concentrations of BDNF.
Assessment of the mBDNF/proBDNF ratio, p75NTR, and tropomyosin receptor kinase B.
Evaluation of the Val66Met polymorphism and epigenetic changes in the BDNF gene.

Main Results:

BDNF levels, genetic variations, and cerebrospinal fluid concentrations correlate with depression severity and treatment response.
Changes in the mBDNF/proBDNF ratio, p75NTR, and tropomyosin receptor kinase B are associated with neuroplasticity.
The Val66Met polymorphism and epigenetic modifications of the BDNF gene may affect treatment responsiveness.

Conclusions:

BDNF holds potential as a key biomarker in understanding and treating depression.
Personalized medicine for depression may be advanced through standardized BDNF measurement, AI analysis, and multifactorial integration.