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New knowledge on the pharmacology of dopamine stabilizers
Date:2/24/2012

A study from Karolinska Institutet in Sweden shows that a new drug for Huntington's disease pridopidine or dopamine stabiliser ACR16 might operate via previously unknown mechanisms of action. Researchers have found that at very low concentrations, ACR16 binds to the sigma-1 receptor, a protein in the brain important to neuronal function and survival. This new knowledge can be used to develop future treatments for schizophrenia, involuntary Parkinsonian tremors and neurodegenerative diseases.

"It's conceivable that some of the beneficial effects of dopamine stabilisers are mediated via the sigma-1 receptor," says principal investigator Daniel Marcellino of the Department of Neuroscience. "Our results suggest a formerly overlooked aspect of dopamine stabiliser pharmacology."

Dopamine stabilisers are a new class of drug substance originally developed by Swedish Nobel laureate Professor Arvid Carlsson. In clinical trials, these substances have revealed promising results against neurological and neuropsychiatric conditions that currently lack suitable treatment, such as schizophrenia and the dyskinesia (involuntary tremors) caused as an adverse effect of Parkinson's drugs.

Pridopidine or dopamine stabiliser ACR16 (also known as Huntexil), is in an advanced phase of clinical trials (phase III) for the relief of the motor symptoms of Huntington's disease, an incurable disease caused by neuronal degeneration in certain parts of the brain. The disease, which is hereditary, is characterised by motor and subsequent psychiatric disorders, leading to a protracted death. There is currently only one drug registered for the relief of Huntington's symptoms, but as it has several adverse effects there is a strong demand for alternative treatment options.

Dopamine stabilisers are thought to exert their beneficial effects primarily via the dopamine D2 receptor, which is a well-known site of action for drugs for Parkinson's disease and schiz
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Contact: Katarina Sternudd
katarina.sternudd@ki.se
46-852-483-895
Karolinska Institutet
Source:Eurekalert

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