Dopamine is a neurotransmitter and hormone that plays essential roles in the central nervous system and periphery. In the brain, dopamine acts as a chemical messenger between nerve cells and is critical for motor control, motivation, reward, and cognitive functions. Outside the central nervous system, it functions as a local messenger. It is involved in various bodily functions, including regulating blood vessels, kidney function, insulin production, and gastrointestinal motility. Dopamine is synthesized from L-DOPA in the brain and kidneys, and also in plants and most animals. Dopamine imbalance is associated with several mental health and neurological conditions, including Parkinson's disease, schizophrenia, ADHD, and depression.
Recent research has challenged long-held beliefs about dopamine's role in movement. A 2025 McGill University study indicated that dopamine might not directly control the speed or force of movement but rather enables movement by providing necessary underlying support. This study suggested that restoring dopamine to normal levels could improve movement, potentially simplifying Parkinson's disease treatment. Another study in 2025, from the University of Colorado Anschutz Medical Campus, revealed that dopamine communicates with precision in the brain, acting like a "finely-tuned postal service" rather than a broad broadcast system. These findings offer new hope for treating dopamine-related disorders and mark a significant advancement in precision-based neuroscience and medicine.
