Neuroscience

Brain stimulation shows promise in treating drug addiction

Today, neurostimulation is used to treat a variety of human disorders, including Parkinson's disease, tremor, obsessive-compulsive disorder and Tourette syndrome. A Mayo Clinic neurosurgeon and his colleagues believe one ...

Neuroscience

Dopamine production is not behind vulnerability to cocaine abuse

Why do some people who try drugs struggle with substance abuse while others don't? This question has long puzzled scientists. A team from the University of Geneva (UNIGE) explored the complex interplay between personality ...

Diseases, Conditions, Syndromes

SARS-CoV-2 can infect dopamine neurons causing senescence

A new study reported that SARS-CoV-2, the virus that causes COVID, can infect dopamine neurons in the brain and trigger senescence—when a cell loses the ability to grow and divide. The researchers from Weill Cornell Medicine, ...

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Dopamine

Dopamine is a neurotransmitter occurring in a wide variety of animals, including both vertebrates and invertebrates. In the brain, this phenethylamine functions as a neurotransmitter, activating the five types of dopamine receptors — D1, D2, D3, D4, and D5, and their variants. Dopamine is produced in several areas of the brain, including the substantia nigra and the ventral tegmental area. Dopamine is also a neurohormone released by the hypothalamus. Its main function as a hormone is to inhibit the release of prolactin from the anterior lobe of the pituitary.

Dopamine can be supplied as a medication that acts on the sympathetic nervous system, producing effects such as increased heart rate and blood pressure. However, because dopamine cannot cross the blood-brain barrier, dopamine given as a drug does not directly affect the central nervous system. To increase the amount of dopamine in the brains of patients with diseases such as Parkinson's disease and dopa-responsive dystonia, L-DOPA (levodopa), which is the precursor of dopamine, can be given because it can cross the blood-brain barrier.

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