Dopamine News and Research

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Dopamine is a hormone and 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 has many functions in the brain, including important roles in behavior and cognition, motor activity, motivation and reward, inhibition of prolactin production (involved in lactation), sleep, mood, attention, and learning. Dopaminergic neurons (i.e., neurons whose primary neurotransmitter is dopamine) are present chiefly in the ventral tegmental area (VTA) of the midbrain, substantia nigra pars compacta, and arcuate nucleus of the hypothalamus.

Rifampicin can prevent the formation of protein fibrils associated with Parkinson's disease

Researchers at the University of California, Santa Cruz, have shown that rifampicin, an antibiotic used to treat leprosy and tuberculosis, can prevent the formation of protein fibrils associated with the death of brain cells in people with Parkinson's disease. The drug also dissolved existing fibrils in laboratory tests.

29 Nov 2004

Discovery of gene mutation in fruit flies that alters sensitivity to crack cocaine

Researchers at the University of California, San Francisco (UCSF) and New York University have discovered a gene mutation in fruit flies that alters sensitivity to crack cocaine and also regulates their internal body clock.

23 Nov 2004

The brain's dopamine system is key to alcoholism

Among the many genes that may contribute to an individual's susceptibility to alcoholism, those in the dopamine system are of special interest because addictive substances can activate this system.

14 Nov 2004

New strain of mice to study nicotine addiction

A team of investigators supported by the National Institute on Drug Abuse (NIDA), National Institutes of Health, has created a strain of mice scientists can use to study nicotine addiction and its associated behaviors.

9 Nov 2004

Dopamine in the brain plays a key role in how we make choices

Researchers at the University of Colorado at Boulder studying Parkinson's disease patients found strong evidence that dopamine in the brain plays a key role in how people implicitly learn to make choices that lead to good outcomes, while avoiding bad ones.

8 Nov 2004

Body's 'internal marijuana': A new target for treatment of schizophrenia, Parkinson's?

“Endocannabinoids” is an impressive word that sounds like the name for a group of tribal warriors or an ancient people. Actually, it is the scientific term for beneficial molecules produced in the brain that act as “a sort of internal marijuana in our system

4 Nov 2004

alpha4 may prove to be useful target for smoking addiction therapies

Nicotine is responsible for more than four million smoking-related deaths each year. Yet people still smoke. Why? One reason is the stranglehold of addiction, started when nicotine enhances the release of a neurotransmitter called dopamine

4 Nov 2004

Smoking and coffee combined have a greater harmful effect on arteries and blood flow

Smoking and coffee often go together. But the combination appears to have a harmful effect on arteries and blood flow that is greater than would be expected from simply combining the effects of each practice.

2 Nov 2004

Marijuana-like compounds may aid Parkinson's disease, pain and obesity

No longer a pipe dream, new animal research now indicates that marijuana-like compounds can aid a bevy of debilitating conditions, ranging from brain disorders such as amyotrophic lateral sclerosis (ALS) and Parkinson's disease, to pain and obesity.

28 Oct 2004

Smoking shown to quell painful sensations and heighten positive emotions

Smokers often say that lighting up a cigarette can calm their nerves, satisfy their craving and help them relax.

28 Oct 2004

Evidence links cellular iron deficiency to restless legs syndrome

Iron-deficient cells in the brain are mixing up central nervous system signals to the legs and arms causing the irresistible urges to move and creepy-crawly sensations that characterize restless legs syndrome (RLS), a Penn State College of Medicine study reports.

25 Oct 2004

Exercise protects brain cells affected by Parkinson's

In an animal model of Parkinson's, exercise prevents degeneration of nerve cells that are normally impaired or destroyed by the disease, according to University of Pittsburgh researchers.

24 Oct 2004

Gene mutation causes Parkinson's disease in some families

An international research team, led by scientists at the National Institute on Aging (NIA), has discovered a gene, which when mutated, causes Parkinson's disease in some families.

22 Oct 2004

Researchers have found two areas of the brain that appear to compete for control over behavior

You walk into a room and spy a plate of gooey doughnuts dripping with chocolate frosting. But wait: You were saving your sweets allotment for a party later today. If it feels like one part of your brain is battling another, it probably is, according to a newly published study.

18 Oct 2004

Dietary iron imbalances increase the odds of developing Parkinson's disease

You might want to toss those iron-fortified vitamins, because absent a diagnosed deficiency too much of a good thing can be bad.

12 Oct 2004

Cocaine addicts experience a decrease in D2 receptors affecting brain regions involved with movement, as well as motivation

A new study builds on previous research showing that cocaine-addicted people have a low expression of specific dopamine receptors—D2 receptors—in a portion of the brain called the striatum.

6 Oct 2004

Approval of Abilify (aripiprazole) for the treatment of acute bipolar mania

Bristol-Myers Squibb and Otsuka Pharmaceutical have announced that the U.S. Food and Drug Administration (FDA) has approved Abilify (aripiprazole) for the treatment of acute bipolar mania, including manic and mixed episodes associated with bipolar disorder.

4 Oct 2004

Study to test the effectiveness of anti-depressants in treating symptoms of Parkinson’s disease

While Parkinson’s disease typically brings to mind symptoms such as tremors and slow movement, researchers have found that nearly half of all Parkinson’s patients also suffer from depression. While it might seem natural that someone who has a disease such as Parkinson’s might become depressed, it’s not so simple, says neurologist Irene Richard, M.D., who leads the study.

27 Sep 2004

Discovery of dopamine terminal injury in brains of people with HIV dementia

Scientists at the U.S. Department of Energy’s Brookhaven National Laboratory have discovered a key mechanism in the brains of people with human immunodeficiency virus (HIV) dementia.

20 Sep 2004

First indication that Parkinson’s disease can be caused by a defect in a protein

The findings of Finnish scientists with their multinational collaborators shed light to the mechanisms of Parkinson’s disease and early menopause.

8 Sep 2004