NWPF

News ArchivesRead News

Scientists Identify Brain Circuitry Associated with Addictive, Depressive Behaviors

Monday April 30, 2012

Discovery Has Implications for Neurodegenerative and Psychiatric Disorders
Anne Holden

UCSF.edu/news - cientists at the UCSF-affiliated Gladstone Institutes have determined how specific circuitry in the brain controls not only body movement, but also motivation and learning, providing new insight into neurodegenerative disorders such as Parkinson’s disease — and psychiatric disorders such as addiction and depression.


Previously, researchers in the laboratory of Gladstone Investigator Anatol Kreitzer, PhD, discovered how an imbalance in the activity of a specific category of brain cells is linked to Parkinson’s.

Now, in a paper published online today in Nature Neuroscience, Kreitzer, who is also an assistant professor of physiology at UCSF, and his team used animal models to demonstrate that this imbalance may also contribute to psychiatric disorders. These findings also help explain the wide range of Parkinson’s symptoms — and mark an important step in finding new treatments for those who suffer from addiction or depression.

“The physical symptoms that affect people with Parkinson’s —including tremors and rigidity of movement — are caused by an imbalance between two types of medium spiny neurons in the brain,” said Kreitzer, whose lab studies how Parkinson’s disease affects brain functions. “In this paper we showed that psychiatric disorders — specifically addiction and depression —might be caused by this same neural imbalance.”

Normally, two types of medium spiny neurons, or MSNs, coordinate body movements. One type, called direct pathway MSNs (dMSNs), acts like a gas pedal. The other type, known as indirect pathway MSNs (iMSNs), acts as a brake. And while researchers have long known about the link between a chemical in the brain called dopamine and Parkinson’s, Gladstone researchers recently clarified that dopamine maintains the balance between these two MSN types.

But abnormal dopamine levels are implicated not only in Parkinson’s, but also in addiction and depression. Kreitzer and his team hypothesized that the same circuitry that controlled movement might also control the process of learning to repeat pleasurable experiences and avoid unpleasant ones—and that an imbalance in this process could lead to addictive or depressive behaviors.

Kreitzer and his team genetically modified two sets of mice so that they could control which specific type of MSN was activated. They placed mice one at a time in a box with two triggers — one that delivered a laser pulse to stimulate the neurons and one that did nothing. They then monitored which trigger each mouse preferred.

“The mice that had only dMSNs activated gravitated toward the laser trigger, pushing it again and again to get the stimulation — reminiscent of addictive behavior,” said Alexxai Kravitz, PhD, Gladstone postdoctoral fellow and a lead author of the paper. “But the mice that had only iMSNs activated did the opposite. Unlike their dMSN counterparts, the iMSN mice avoided the laser stimulation, which suggests that they found it unpleasant.” These findings reveal a precise relationship between the two MSN types and how behaviors are learned. They also show how an MSN imbalance can throw normal learning processes out of whack, potentially leading to addictive or depressive behavior.

“People with Parkinson’s disease often show signs of depression before the onset of significant movement problems, so it’s likely that the neural imbalance in Parkinson’s is also responsible for some behavioral changes associated with the disease,” said Kreitzer, who is also an assistant professor of physiology at UCSF.. “Future research could discover how MSNs are activated in those suffering from addiction or depression—and whether tweaking them could reduce their symptoms and improve their quality of life.

Graduate student Lynne Tye was also a lead author on this paper. Funding came from a variety of sources, including the W.M. Keck Foundation, the Pew Biomedical Scholars Program, the McKnight Foundation and the National Institutes of Health.

Gladstone is an independent and nonprofit biomedical-research organization dedicated to accelerating the pace of scientific discovery and innovation to prevent, treat and cure cardiovascular, viral and neurological diseases.

UCSF is a leading university dedicated to promoting health worldwide through advanced biomedical research, graduate-level education in the life sciences and health professions, and excellence in patient care.

http://www.ucsf.edu/news/2012/04/11959/scientists-identify-brain-circuitry-associated-addictive-depressive-behaviors

Recent News

Oct 17 - Scientists Identify Structure of PINK1, Key Parkinson’s-protective Protein
Oct 17 - Diabetes drug cuts Parkinson's risk by 28 percent, study finds
Oct 10 - Advances in Brain Pacemaker Reduces Tremors, Helps Parkinson's Sufferers Live a More Normal Life
Oct 10 - Medical History Could Help Predict Parkinson's Disease Risk Long Before Diagnosis
Oct 3 - Changes in Olfactory Bulb Explain Loss of Smell in Early Stages of Parkinson’s Disease, Study Finds
Oct 3 - Sleep Disturbances May Worsen Motor Symptoms in Parkinson’s Disease, Study Suggests
Sep 12 - Australian Researchers Develop New Diagnostic Tool to Spot Early Signs of Parkinson’s
Sep 11 - GeneFo Webinar to Focus on Using Humor to Manage Parkinson’s Disease
Sep 6 - Parkinson’s and the ‘D’ word
Sep 6 - Compounds in Asthma Drugs Might Be Used as Parkinson’s Treatment
Sep 5 - AstraZeneca Joins Takeda, Berg to Advance Development of Parkinson’s Disease Therapies
Sep 1 - Stem Cell Transplant Trial in Parkinson’s Patients Planned After Test in Japan Succeeds in Monkeys
Sep 1 - Titan to Start Phase 1/2 Study of Subdermal Implant to Deliver Requip to Parkinson’s Patients
Aug 30 - FDA Refuses Acorda’s Inbrija New Drug Application Due to Manufacturing Questions
Aug 23 - Support Groups: Are They for You?
Aug 22 - Internet Visits with Parkinson’s Specialist Can Be as Effective as In-person Visits, Trial Finds
Aug 21 - Cavion’s New CMO to Lead Cav3 Platform Development for Neurological Diseases
Aug 15 - Singing Helps Early-stage Parkinson’s Patients Retain Speech, Respiratory Control, Studies Show
Aug 14 - 16 Tips to Increase Your Mobility Confidence While Living With Parkinson’s Disease
Aug 10 - Boxers are fighting back against Parkinson’s