Stress, schizophrenia and bipolar disorder

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Stress is known to trigger psychotic episodes in schizophrenia and bipolar disorder.
• The underlying neurobiological mechanisms remain unclear.
• Neurodevelopmental models suggest early dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis and immune function contribute to psychosis vulnerability.

Purpose of the Study:

• To explore the neurobiological link between early life stress and psychosis development.
• To integrate findings from neurodevelopmental models, childhood trauma research, and epigenetics.
• To propose a revised model where stress exposure is a key factor in psychosis vulnerability.

Main Methods:

• Review of current neurodevelopmental models of psychosis.
• Examination of evidence linking childhood trauma to stress-regulating brain systems.
• Consideration of emerging epigenetic research on environmental effects on gene expression.

Main Results:

• Early dysfunction in HPA axis and immune systems due to stress impacts brain network development.
• Childhood trauma affects the development of stress-regulating brain systems.
• Epigenetic studies highlight how environmental factors influence gene expression relevant to psychosis.

Conclusions:

• Stress exposure during critical developmental periods is a significant factor in developing psychosis vulnerability.
• This vulnerability arises from stress-induced brain dysfunction, not just interaction with a pre-existing biological vulnerability.
• Converging evidence supports a model where early stress actively shapes the neurobiological underpinnings of psychosis.