Navigation Links
Brain Region Tied to Amphetamine Addiction
Date:10/25/2007

When the insula was switched off, rats lost the craving, scientists say

THURSDAY, Oct. 25 (HealthDay News) -- A specific brain region may be crucial to drug addiction, according to a new study conducted with amphetamine-addicted rats.

"This work in rats lines up nicely with new findings in humans involved with drug-seeking behavior," said one outside expert, Dr. Robert Vorel, a fellow at Columbia University Medical Center's division of drug abuse in New York City.

The brain segment, called the insular cortex, "may be a key structure in decision-making by informing the executive prefrontal cortex of our needs -- as in the case of drug abuse," study lead author Dr. Fernando Torrealba, a neuroscientist at the Pontifical Catholic University of Chile, in Santiago, said in a statement.

The insular cortex, also known as the insula, is part of the sensory system that monitors the body's perception of physical states and needs. The new study shows that the insula "may guide behavior in humans," Torrealba said.

Prior studies done in humans looked at the role of the insula in nicotine craving. They revealed insula activity in smokers exposed to tobacco fumes, Vorel said.

And he added that other work has studied people who suffered brain injuries. They showed that smokers who had strokes that damaged the insula were most likely to give up smoking. "That raised a lot of attention," Vorel said.

The new Chilean work on amphetamines and the insula, "probably confirms what is already known in humans," Vorel said.

The Chilean researchers worked with amphetamine-addicted rats. In one series of studies, insular cortex activity was silenced by injections of a drug that inactivated brain cells in the area. When that happened, the rats stopped seeking amphetamines and returned to their normal behaviors -- for example, going to a dark compartment rather than the brighter region they favored while taking amphetamines. However, their craving for amphetamines returned when the insula went back into action.

In a second experiment, the rats received injections of lithium, a drug used to treat mood disorders that can cause gastrointestinal discomfort. The malaise promptly appeared under normal conditions but not when the rats' insulas were inactivated just before the lithium shots.

The Chilean researchers said they plan human trials to confirm what has been seen in the animal studies. They also plan more animal work to see if they can prevent amphetamine craving for longer periods and perhaps alleviate other distressing symptoms of amphetamine addiction.

More information

There's more on drug addiction at the U.S. National Institute on Drug Abuse.



SOURCES: Robert Vorel, M.D., Ph.D, fellow, division of drug abuse, Columbia University Medical Center, New York; Oct. 26, 2007, Science


'/>"/>
Copyright©2007 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Use of Cellular Phones associated with Increased risk of Brain Tumors
2. Brain death – How to cope with it
3. Multi billion-dollar suit filed against cell phone firm for causing brain tumours
4. “Brain fingerprinting”- The new lie detectr
5. Nasal Spray Could Take Drugs Direct to Brain.
6. Two doctors suspended for wrong brain surgery
7. The brain loves a surprise
8. Virus Combats Brain Tumour
9. Increase in sugar...decrease in brain function!!!
10. Alcohol shrinks brain
11. Roller coaster takes brain for a big ride!!
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/19/2017)... ... August 19, 2017 , ... Praeclarus Press ... mothers. These illustrations show the diversity of the breastfeeding mothers, using bright ... range of sizes. These illustrations are also available on tote bags, notepads, smartphone ...
(Date:8/18/2017)... ... August 19, 2017 , ... Mr. Noppadon Pakprot, Deputy ... Amazing Thailand Health and Wellness Tourism Showcase 2017 yesterday, which unveiled the latest ... for Tourism Products and Business at TAT said, “Thailand has long been recognized ...
(Date:8/18/2017)... ... August 18, 2017 , ... August ... “Vision & Hearing,” advocating for active, healthy lifestyles and highlighting the importance of ... individuals with hearing impairments and shares the latest innovations in hearing aid technology. ...
(Date:8/18/2017)... (PRWEB) , ... August 18, 2017 , ... ... consulting services and asset protection assistance to communities in North-Central West Virginia, is ... critical services to at-risk boys in the area. , The Chestnut Mountain Ranch ...
(Date:8/18/2017)... ... 2017 , ... The Golseth Agency, a Texas based insurance management and financial ... regional charity campaign organized to provide support to Christina Upchurch and her two children ... and her children returned from out of town to find her husband passed away ...
Breaking Medicine News(10 mins):
(Date:8/15/2017)... Aug. 15, 2017   Mostyn Law and Gulf Coast ... Houston, Texas . The Mostyn Law family has ... years. That is why Mostyn Law is partnering with ... to show its appreciation. Blood supplies are running low. ... short of hospital needs in August. That is why the blood ...
(Date:8/15/2017)... N.C. , Aug. 15, 2017  Axium Pharmaceuticals Inc., the creator ... rumored to be in the beginning stages of an IPO. ... on epilepsy medications with the average cost of a prescription epilepsy drug ... ... Another staggering figure is the fact ...
(Date:8/15/2017)... , Aug. 15, 2017  AOTI Inc. announced today that its ... Inc., has recently opened a New York City Office in ... of its unique Topical Wound Oxygen (TWO 2 ) homecare therapy. ... Accreditation Commission for Health Care (ACHC) under the company,s DMEPOS accreditation ... ...
Breaking Medicine Technology: