advertisement
Home » News » Stress Management » Animal Research Suggests Genetic Link to Stress Recovery

Animal Research Suggests Genetic Link to Stress Recovery

Animal Research Suggests Genetic Link to Stress RecoveryPost-traumatic stress disorder has become better-known lately, especially in relation to soldiers returning from combat in Iraq and Afghanistan. But harrowing events can also have a significant impact on civilians as well.

Of course, feelings of anxiety are normal and even desirable as they are a part of what helps us survive in a world of real threats. You want to be able to sense danger  and either stand ready to attack, or to run — the “fight or flight” response.

But no less crucial is the return to normal — the slowing of the heartbeat and relaxation of tension — after the threat has passed. People who have a hard time “turning off” their stress response are candidates for post-traumatic stress syndrome, as well as anorexia, anxiety disorders and depression.

How does the body recover from responding to shock or acute stress?

This question is at the heart of research at the Weizmann Institute of Science in Israel, conducted by Dr. Alon Chen of the Neurobiology Department. The response to stress begins in the brain, and Chen concentrates on a family of proteins that play a prominent role in regulating this mechanism.

One protein in the family — CRF — is known to initiate a chain of events that occurs when we cope with pressure, and scientists have hypothesized that other members of the family are involved in shutting down that chain.

In research that appeared in the Proceedings of the National Academy of Sciences (PNAS), Chen and his team have now, for the first time, provided sound evidence that three family members known as urocortin 1, 2 and 3 are responsible for turning off the stress response.

The research group created genetically engineered mice that don’t produce the three urocortin proteins. Before they were exposed to stress, these mice acted just like the control mice, showing no unusual anxiety.

When the scientists stressed the mice, both groups reacted in the same way, showing clear signs of distress. Differences between the groups only appeared when they were checked 24 hours after the stressful episode: While the control mice had returned to their normal behavior, appearing to have recovered completely from the shock, the engineered mice were still showing the same levels of anxiety the scientists had observed immediately following their exposure to the stress.

Clearly, the urocortin proteins are crucial for returning to normal, but how, exactly, do they do this? To identify the mechanism for the proteins’ activity, Chen and his team tested both groups of mice for expression levels of a number of genes known to be involved in the stress response.

They found that gene expression levels remained constant during and after stress in the engineered mice, whereas patterns of gene expression in the control mice had changed quite a bit 24 hours after the fact. In other words, without the urocortin system, the “return to normal” program couldn’t be activated.

According to Chen, “Our findings imply that the urocortin system plays a central role in regulating stress responses, and this may have implications for such diseases as anxiety disorders, depression and anorexia. The genetically engineered mice we created could be effective research models for these diseases.”

Source: Weizmann Institute of Science

Animal Research Suggests Genetic Link to Stress Recovery

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). Animal Research Suggests Genetic Link to Stress Recovery. Psych Central. Retrieved on November 21, 2018, from https://psychcentral.com/news/2011/02/09/animal-research-suggests-genetic-link-to-stress-recovery/23324.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.