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Dopamine's Role in Schizophrenia and Other Brain Disorders
Dopamine is a pivotal neurotransmitter regulating reward, motivation, movement, attention, emotion, sleep, and learning.
Key Pathways
- Mesolimbic – VTA to nucleus accumbens; reward, addiction. Hyperactivity linked to positive symptoms of schizophrenia (hallucinations, delusions).
- Mesocortical – VTA to prefrontal cortex; cognition, executive function. Hypoactivity linked to negative/cognitive symptoms.
- Nigrostriatal – Substantia nigra to striatum; motor control. Degeneration → Parkinson's disease.
- Tuberoinfundibular – Hypothalamus to pituitary; prolactin regulation.
Therapeutic Implications
- Antipsychotics: D2 antagonists (typical) or partial agonists (atypical) reduce mesolimbic dopamine.
- Parkinson's: Levodopa (precursor), dopamine agonists, MAO-B inhibitors.
- ADHD: Stimulants increase dopamine/norepinephrine in PFC.
For deeper reading: NIH Review on Dopamine and Schizophrenia.
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