Navigation Links
Stress hormones: Good or bad for posttraumatic stress disorder risk?
Date:9/12/2012

Philadelphia, PA, September 12, 2012 Glucocorticoids, a group of hormones that includes cortisol, are considered stress hormones because their levels increase following stress. When their relationship to stress was first identified, it was shown that the release of cortisol prepared the body to cope with the physical demands of stress. Subsequently, high levels of cortisol were linked to depression and other stress-related disorders, giving rise to the hypothesis that high levels of cortisol on a long-term basis may impair the psychological capacity to cope with stress.

For this reason, drugs such as mifepristone that block glucocorticoid activity, called glucocorticoid receptor antagonists, have been tested as treatments for depression. But other recent data suggest that, in animal models and in humans, elevating glucocorticoid levels may reduce the development of posttraumatic stress disorder or PTSD.

This hypothesis is now supported by a new study in Biological Psychiatry. Using an animal model of PTSD, Rajnish Rao and colleagues demonstrate that elevated levels of glucocorticoids at the time of acute stress confers protection against anxiety-like behavior and the delayed enhancing effect of stress on synaptic connectivity in the basolateral amygdala.

"It seems, increasingly, that the 'trauma' in posttraumatic stress disorder is the impact of stress on brain structure and function," commented Dr. John Krystal, Editor of Biological Psychiatry. "The study by Rao and colleagues provides evidence that glucocorticoids may have protective effects in their animal model that prevent from these changes in synaptic connectivity, potentially shedding light on protective effects of glucocorticoids described in relation to PTSD."

Senior author Prof. Sumantra Chattarji from the National Centre for Biological Sciences in Bangalore, India, explained the reasoning behind their work: "First, this work was inspired by a puzzle - counterintuitive clinical reports - that individuals having lower levels of cortisol are more susceptible to developing PTSD and that cortisol treatment in turn reduces the cardinal symptoms of PTSD. Second, using a rodent model of acute stress, we were not only able to capture the essence of these clinical reports, but also identify a possible cellular mechanism in the amygdala, the emotional hub of the brain."

Their results are consistent with clinical reports on the protective effects of glucocorticoids against the development of PTSD symptoms triggered by traumatic stress.

Two successive manipulations, both of which elevate corticosterone levels by themselves, together reset the number of synapses in the amygdala and restored anxiety behavior to normal levels in rats. Strikingly, these high and low numbers of synapses in the amygdala appear to be reliable predictors of high and low anxiety states respectively.

"With the increasing costs and suffering associated with PTSD victims, it is our hope that basic research of the kind reported in this study will help in developing new therapeutic strategies against this debilitating disorder," concluded Chattarji.


'/>"/>
Contact: Rhiannon Bugno
Biol.Psych@utsouthwestern.edu
214-648-0880
Elsevier
Source:Eurekalert

Related biology news :

1. Ecosystems cope with stress more effectively the greater the biodiversity
2. New method: Research team analyzes stress biology in babies
3. Acute stress alters control of gene activity
4. For young birds, getting stressed out can be a good thing
5. A diet high in choline during pregnancy may mean less stress for baby
6. Sick from stress? Blame your mom… and epigenetics
7. Long-distance distress signal from periphery of injured nerve cells begins with locally made protein
8. Researchers study knee stress at tissue, cellular levels
9. Bend or stretch? How stressful is hyperflexion of horses necks?
10. Red hair is a sign of oxidative stress in wild boars, but gray is a-ok
11. LSUHSC research finds treating stress prevented new MS brain lesions
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/9/2016)... June 9, 2016 Paris ... Teleste,s video security solution to ensure the safety of people ... during the major tournament Teleste, an international ... and services, announced today that its video security solution will ... to back up public safety across the country. The system ...
(Date:6/3/2016)... Das DOTM (Department ... hat ein 44 Millionen $-Projekt ... einschließlich Personalisierung, Registrierung und IT-Infrastruktur, an Decatur ... Implementierung von Identitätsmanagementlösungen. Zahlreiche renommierte internationale Anbieter ... aber Decatur wurde als konformste und innovativste ...
(Date:6/2/2016)... , June 2, 2016   The Weather Company , ... Watson Ads, an industry-first capability in which consumers will be ... able to ask questions via voice or text and receive ... Marketers have long sought an advertising ... that can be personal, relevant and valuable; and can scale ...
Breaking Biology News(10 mins):
(Date:12/2/2016)... ... December 01, 2016 , ... ... DNA microarray comparative genomic hybridization (array CGH) for HER2 genomic subtyping in ... molecular test results from tumors with previously documented positive, negative, and equivocal ...
(Date:12/2/2016)... ... December 01, 2016 , ... The Conference Forum has announced that ... and will take place on February 1-3, 2017 at the Roosevelt Hotel in New ... the program provides a unique 360-degree approach, which addresses the most up-to-date information regarding ...
(Date:12/2/2016)... ... December 02, 2016 , ... The ... to collaboratively developing improved chemistry, manufacturing and control technologies for the pharmaceutical ... with robust, probe-based sampling. , Online liquid chromatography analysis is becoming ...
(Date:12/2/2016)... The immunohistochemistry (IHC) market is projected to reach ... during the forecast period of 2016 to 2021 dominated by immunohistochemistry ... the largest share of immunohistochemistry (IHC) market, by end user.   ... , , ... across 225 pages, profiling 10 companies and supported with 181 tables ...
Breaking Biology Technology: