Neuroscience in pictures: Bipolar disorder

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Bipolar disorder is a chronic mood illness with recurrent mania and depression.
• It affects approximately 2.4% of the global population.
• Pathophysiology involves complex interactions of genetic, developmental, and environmental factors.

Purpose of the Study:

• To explore the pathophysiology of bipolar disorder.
• To examine the case of a young individual with a first manic episode with psychotic features.
• To review interconnected pathophysiological mechanisms.

Main Methods:

• Pictorial review approach.
• Case study analysis of a young patient.
• Literature review of genetic, neurodevelopmental, and environmental factors.
• Examination of neurobiological mechanisms including circuit dysfunction, neuroinflammation, and neuroplasticity.

Main Results:

• Bipolar disorder arises from a convergence of high heritability (70-90%), neurodevelopmental vulnerability, and environmental triggers like sleep restriction and antidepressants.
• Key mechanisms include fronto-limbic and reward circuit dysfunction, catecholaminergic-cholinergic imbalance, neuroinflammation, disrupted synaptic plasticity (BDNF-mediated), axis dysregulation (HPA, thyroid, gonadal), and circadian rhythm disturbance.
• Recurrent episodes may lead to progressive, heterogeneous brain changes.

Conclusions:

• Early intervention and adherence are crucial due to potentially modifiable progressive brain changes.
• Emerging biomarkers and phase-specific treatments are advancing personalized, multimodal care.
• Treatment integrates mood stabilization with chronobiological and psychosocial optimization.