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Better Approach for Depression?

Better Approach for Depression? Using an animal model, researchers have discovered how a key receptor in the brain influences the effectiveness of serotonin-related antidepressants, such as Prozac.

University of Michigan scientists say the knowledge may result in a more targeted treatment of depression and anxiety with fewer side effects.

Depressive disorders change a person’s mood, emotions and physical well-being and can co-occur with anxiety disorders and substance abuse.

“There are big drawbacks in the current therapies for depression,” says senior author John Traynor, Ph.D., professor of pharmacology at the U-M Medical School and director of the U-M Substance Abuse Research Center.

“Therapeutic benefits are delayed, there are unwanted side effects, and it’s not unusual for depressive symptoms to return.”

Authors say the high relapse rate indicates a need for additional treatment options for the estimated 20.9 million Americans with depression.

The best current treatments for depression are selective serotonin reuptake inhibitors, or SSRIs. These drugs work by flooding the brain’s synapses with serotonin, a neurotransmitter linked with mood, and increasing serotonin signaling through the more than 20 serotonin receptors in the brain.

However, the team of researchers showed one particular pathway, the serotonin 5HT1a receptor, is linked with antidepressive and antianxiety behavior in mice.

“Rather than activating all serotonin receptors as SSRIs do, one could increase signaling through the one critical serotonin receptor that our research shows is important for antidepressant behavior,” says co-author Richard R. Neubig, M.D., Ph.D., co-director of the U-M Center for Chemical Genomics and professor of pharmacology at the U-M Medical School.

The new research details the complex actions of a family of proteins, known as RGS proteins, that act as brakes on neurotransmitter signaling.

Researchers created a mutant mouse to boost serotonin signaling at the 5HT1a receptor. This was done by genetically inhibiting the activity of braking proteins. Without the normal brake on serotonin signaling, these mutant mice showed antidepressive behavior even without being given antidepressant drugs. The mice were also more responsive to SSRIs.

Authors say that further research could lead to drugs capable of inhibiting the RGS proteins and which would target the antidepressant signal where it is required on critical 5HT1a receptors.

The findings appear online this week ahead of print in the journal Proceedings of the National Academy of Sciences.

Source: University of Michigan

Better Approach for Depression?

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2015). Better Approach for Depression?. Psych Central. Retrieved on September 23, 2018, from https://psychcentral.com/news/2010/06/03/better-approach-for-depression/14268.html

 

Scientifically Reviewed
Last updated: 6 Oct 2015
Last reviewed: By John M. Grohol, Psy.D. on 6 Oct 2015
Published on PsychCentral.com. All rights reserved.