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Addiction to morphine and heroin can be blocked, according to research released on Wednesday which could prove a major breakthrough in treating addicts and in pain relief treatments. Researchers at the University of Adelaide in Australia worked with colleagues at the University of Colorado in the United States to pinpoint a key mechanism in the body's immune system that amplifies addiction to opioid drugs.

 

"Our studies have shown conclusively that we can block addiction via the immune system of the brain, without targeting the brain's wiring," said Mark Hutchinson from Adelaide's School of Medical Sciences.

 

"Both the central nervous system and the immune system play important roles in creating addiction, but our studies have shown we only need to block the immune response in the brain to prevent cravings for opioid drugs."

 

The results, to be published Thursday in the Journal of Neuroscience, reveal that laboratory studies showed that the drug known as plus-naloxone, which is not yet in clinical use, will selectively block the immune-addiction response.

The researchers said that opioid drugs such as morphine and heroin bind to immune receptors in the brain known as TLR4 which then act as amplifiers for addiction, ramping up the "reward" effect of drugs of abuse to a high degree.

The new drug automatically shuts this effect down, Hutchinson said.

 

"It really reduces the reward level down to the equivalent of food, sex, and hugs," he told AFP.

 

Professor Linda Watkins, from the Center for Neuroscience at the University of Colorado, said the work fundamentally changed understanding about opioids, reward and addiction. --- Keep reading this story

BLOCKING

HEROIN

Addiction to heroin can be blocked, research says.