Skip to main content
Intellect

Flipping the brain’s addiction switch without drugs

  • The researchers flipped the brain's addiction switch in rats with a naturally occuring protein delivered to the brain's pleasure center
  • The advance may suggest ways to medically counteract drug addiction
  • Two undergraduates co-authored the paper with their faculty mentor in one of the top two scientific journals

When someone becomes dependent on drugs or alcohol, the brain’s pleasure center gets hijacked, disrupting the normal functioning of its reward circuitry.
Researchers investigating this addiction “switch” have now implicated a naturally occurring protein, a dose of which allowed them to get rats hooked with no drugs at all.

The research is published in the journal Science, one of the top two scientific journals in the world.

“If we can understand how the brain’s circuitry changes in association with drug abuse, it could potentially suggest ways to medically counteract the effects of dependency,” said Scott Steffensen, a neuroscientist at Brigham Young University who co-authored the study with two of his undergraduate students, one of his grad students, and a team of researchers at the University of Toronto.

Chronic drug users, as noted by previous research, can experience an increase of a naturally-occurring protein called BDNF (brain-derived neurotrophic factor) in the brain’s reward circuitry, a region scientists call the ventral tegmental area. In this study, the researchers took the drugs out of the equation and directly infused extra BDNF onto this part of the brain in rats.

The Toronto team noted that a single injection of BDNF made rats behave as though they were dependent on opiates (which they had never received). Though rats instinctively prefer certain smells, lighting and texture, these rats left their comfort zone in search of a fix.

"This work may reveal a mechanism that underlies drug addiction," said lead author Hector Vargas-Perez, a neurobiologist at the University of Toronto.

The BYU team confirmed that the protein is a critical regulator of drug dependency. After the BDNF injection, specific chemicals that normally inhibit neurons in this part of the brain instead excited them, a “switch” known to occur when people become dependent on drugs.

Steffensen, who teaches in BYU’s psychology department, says this work suggests that BDNF is crucial for inducing a drug dependent state, one important aspect of drug addiction.

BYU undergrad and study co-author Micah Hansen researched in Steffensen’s neuroscience lab from his freshman year through his graduation one month ago.

Fellow student co-author Christine Walton completed her bachelor's degree last August. She now works with a team of researchers studying cocaine addiction for the National Institutes of Health in Bethesda, Md.

“As a lab, we are interested in what changes occur in the brain of an addict,” Walton said.

David Allison, a neuroscience graduate student at BYU, is also a co-author.

Related Articles
data-content-type="article"
May 04, 2021
They may be tiny weapons, but BYU’s holography research group has figured out how to create lightsabers — green for Yoda and red for Darth Vader, naturally — with actual luminous beams rising from them.
overrideBackgroundColorOrImage= overrideTextColor= overrideTextAlignment= overrideCardHideSection=false overrideCardHideByline=false overrideCardHideDescription=false overridebuttonBgColor= overrideButtonText= overrideTextAlignment=
data-content-type="article"
April 30, 2021
A recent mega-study co-authored by a BYU professor showed that sending patients text message reminders to get a flu shot at their routine appointments increased vaccination rates by up to 11%, enough to make a significant impact in national immunity.
overrideBackgroundColorOrImage= overrideTextColor= overrideTextAlignment= overrideCardHideSection=false overrideCardHideByline=false overrideCardHideDescription=false overridebuttonBgColor= overrideButtonText= overrideTextAlignment=
data-content-type="article"
April 25, 2021
New BYU study finds that night shift functions don’t actually improve sleep.
overrideBackgroundColorOrImage= overrideTextColor= overrideTextAlignment= overrideCardHideSection=false overrideCardHideByline=false overrideCardHideDescription=false overridebuttonBgColor= overrideButtonText= overrideTextAlignment=
overrideBackgroundColorOrImage= overrideTextColor= overrideTextAlignment= overrideCardHideSection=false overrideCardHideByline=false overrideCardHideDescription=false overridebuttonBgColor= overrideButtonText=