Decreased SGK1 Expression and Function Contributes to Behavioral Deficits Induced by Traumatic Stress

Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amyg...

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Published inPLoS biology Vol. 13; no. 10; p. e1002282
Main Authors Licznerski, Pawel, Duric, Vanja, Banasr, Mounira, Alavian, Kambiz N., Ota, Kristie T., Kang, Hyo Jung, Jonas, Elizabeth A., Ursano, Robert, Krystal, John H., Duman, Ronald S.
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 01.10.2015
Public Library of Science (PLoS)
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ISSN1545-7885
1544-9173
1545-7885
DOI10.1371/journal.pbio.1002282

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Abstract Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amygdala of individuals subjected to traumatic stress, remain unknown. In this study, we show that serum and glucocorticoid regulated kinase 1 (SGK1) expression is down-regulated in the postmortem PFC of PTSD subjects. Furthermore, we demonstrate that inhibition of SGK1 in the rat medial PFC results in helplessness- and anhedonic-like behaviors in rodent models. These behavioral changes are accompanied by abnormal dendritic spine morphology and synaptic dysfunction. Together, the results are consistent with the possibility that altered SGK1 signaling contributes to the behavioral and morphological phenotypes associated with traumatic stress pathophysiology.
AbstractList   Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amygdala of individuals subjected to traumatic stress, remain unknown. In this study, we show that serum and glucocorticoid regulated kinase 1 (SGK1) expression is down-regulated in the postmortem PFC of PTSD subjects. Furthermore, we demonstrate that inhibition of SGK1 in the rat medial PFC results in helplessness- and anhedonic-like behaviors in rodent models. These behavioral changes are accompanied by abnormal dendritic spine morphology and synaptic dysfunction. Together, the results are consistent with the possibility that altered SGK1 signaling contributes to the behavioral and morphological phenotypes associated with traumatic stress pathophysiology.
Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amygdala of individuals subjected to traumatic stress, remain unknown. In this study, we show that serum and glucocorticoid regulated kinase 1 (SGK1) expression is down-regulated in the postmortem PFC of PTSD subjects. Furthermore, we demonstrate that inhibition of SGK1 in the rat medial PFC results in helplessness- and anhedonic-like behaviors in rodent models. These behavioral changes are accompanied by abnormal dendritic spine morphology and synaptic dysfunction. Together, the results are consistent with the possibility that altered SGK1 signaling contributes to the behavioral and morphological phenotypes associated with traumatic stress pathophysiology. experimentally decreasing SGK1 function in the prefrontal cortex of rats resulted in behaviors characteristic of traumatic stress, including the unwillingness to avoid discomfort and the inability to experience pleasure. Finally, reduced SGK1 function in neurons affected their basic electrophysiological properties and caused a decrease in the number of dendritic spines--the specialized protrusions of dendrites that receive synaptic inputs.
Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amygdala of individuals subjected to traumatic stress, remain unknown. In this study, we show that serum and glucocorticoid regulated kinase 1 (SGK1) expression is down-regulated in the postmortem PFC of PTSD subjects. Furthermore, we demonstrate that inhibition of SGK1 in the rat medial PFC results in helplessness- and anhedonic-like behaviors in rodent models. These behavioral changes are accompanied by abnormal dendritic spine morphology and synaptic dysfunction. Together, the results are consistent with the possibility that altered SGK1 signaling contributes to the behavioral and morphological phenotypes associated with traumatic stress pathophysiology.
Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amygdala of individuals subjected to traumatic stress, remain unknown. In this study, we show that serum and glucocorticoid regulated kinase 1 (SGK1) expression is down-regulated in the postmortem PFC of PTSD subjects. Furthermore, we demonstrate that inhibition of SGK1 in the rat medial PFC results in helplessness- and anhedonic-like behaviors in rodent models. These behavioral changes are accompanied by abnormal dendritic spine morphology and synaptic dysfunction. Together, the results are consistent with the possibility that altered SGK1 signaling contributes to the behavioral and morphological phenotypes associated with traumatic stress pathophysiology.Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amygdala of individuals subjected to traumatic stress, remain unknown. In this study, we show that serum and glucocorticoid regulated kinase 1 (SGK1) expression is down-regulated in the postmortem PFC of PTSD subjects. Furthermore, we demonstrate that inhibition of SGK1 in the rat medial PFC results in helplessness- and anhedonic-like behaviors in rodent models. These behavioral changes are accompanied by abnormal dendritic spine morphology and synaptic dysfunction. Together, the results are consistent with the possibility that altered SGK1 signaling contributes to the behavioral and morphological phenotypes associated with traumatic stress pathophysiology.
Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular mechanisms underlying the structural and functional alterations within corticolimbic brain regions, including the prefrontal cortex (PFC) and amygdala of individuals subjected to traumatic stress, remain unknown. In this study, we show that serum and glucocorticoid regulated kinase 1 ( SGK1 ) expression is down-regulated in the postmortem PFC of PTSD subjects. Furthermore, we demonstrate that inhibition of SGK1 in the rat medial PFC results in helplessness- and anhedonic-like behaviors in rodent models. These behavioral changes are accompanied by abnormal dendritic spine morphology and synaptic dysfunction. Together, the results are consistent with the possibility that altered SGK1 signaling contributes to the behavioral and morphological phenotypes associated with traumatic stress pathophysiology. Activity of the protein kinase SGK1 is reduced in the prefrontal cortex of individuals with post-traumatic stress disorder (PTSD), and SGK1 inhibition can cause PTSD-related behavioral changes in an animal model. Improper functioning of the brain regions known as prefrontal cortex and amygdala is associated with the development of post-traumatic stress disorder. However, little is known about the molecular mechanisms that underlie this condition. We found that the expression of a protein kinase involved in cellular responses to stress, known as serum and glucocorticoid regulated kinase 1 (SGK1), was decreased in the prefrontal cortex of subjects who had died with post-traumatic stress disorder. Furthermore, we found that experimentally decreasing SGK1 function in the prefrontal cortex of rats resulted in behaviors characteristic of traumatic stress, including the unwillingness to avoid discomfort and the inability to experience pleasure. Finally, reduced SGK1 function in neurons affected their basic electrophysiological properties and caused a decrease in the number of dendritic spines—the specialized protrusions of dendrites that receive synaptic inputs.
Audience Academic
Author Licznerski, Pawel
Alavian, Kambiz N.
Jonas, Elizabeth A.
Kang, Hyo Jung
Banasr, Mounira
Krystal, John H.
Duman, Ronald S.
Ota, Kristie T.
Duric, Vanja
Ursano, Robert
AuthorAffiliation 3 Department of Physiology and Pharmacology, Des Moines University, Des Moines, Iowa, United States of America
Emory University, UNITED STATES
7 VA National Center for PTSD, VA Connecticut Healthcare System, West Haven, Connecticut, United States of America
8 Yale-New Haven Hospital, New Haven, Connecticut, United States of America
4 Division of Brain Sciences, Department of Medicine, Imperial College London, London, United Kingdom
6 Abraham Ribicoff Research Facilities, Connecticut Mental Health Center, New Haven, Connecticut, United States of America
1 Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut, United States of America
5 Department of Psychiatry and Center for the Study of Traumatic Stress, Uniformed Services University of the Health Sciences and for the Traumatic Stress Brain Study Group, Bethesda, Maryland, United States of America
2 Department of Internal Medicine, Section of Endocrinology, Yale University School of Medicine, New Haven, Connectic
AuthorAffiliation_xml – name: 7 VA National Center for PTSD, VA Connecticut Healthcare System, West Haven, Connecticut, United States of America
– name: Emory University, UNITED STATES
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– name: 2 Department of Internal Medicine, Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, United States of America
– name: 4 Division of Brain Sciences, Department of Medicine, Imperial College London, London, United Kingdom
– name: 5 Department of Psychiatry and Center for the Study of Traumatic Stress, Uniformed Services University of the Health Sciences and for the Traumatic Stress Brain Study Group, Bethesda, Maryland, United States of America
– name: 3 Department of Physiology and Pharmacology, Des Moines University, Des Moines, Iowa, United States of America
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– name: 8 Yale-New Haven Hospital, New Haven, Connecticut, United States of America
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2015 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Licznerski P, Duric V, Banasr M, Alavian KN, Ota KT, Kang HJ, et al. (2015) Decreased SGK1 Expression and Function Contributes to Behavioral Deficits Induced by Traumatic Stress. PLoS Biol 13(10): e1002282. doi:10.1371/journal.pbio.1002282
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– notice: 2015 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Licznerski P, Duric V, Banasr M, Alavian KN, Ota KT, Kang HJ, et al. (2015) Decreased SGK1 Expression and Function Contributes to Behavioral Deficits Induced by Traumatic Stress. PLoS Biol 13(10): e1002282. doi:10.1371/journal.pbio.1002282
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Conceived and designed the experiments: PL RSD. Performed the experiments: PL VD MB KNA HJK. Analyzed the data: PL KTO KNA RSD. Contributed reagents/materials/analysis tools: EAJ RU TSBSG. Wrote the paper: PL JHK RSD.
The authors have declared that no competing interests exist.
Membership of the Traumatic Stress Brain Study Group is provided in the Acknowledgments.
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– reference: 26506406 - PLoS Biol. 2015 Oct;13(10):e1002283
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Snippet Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular...
  Exposure to extreme stress can trigger the development of major depressive disorder (MDD) as well as post-traumatic stress disorder (PTSD). The molecular...
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SubjectTerms Adult
Analysis
Animals
Behavior, Animal
Brain research
Cohort Studies
Corticosteroids
Dendritic Spines - enzymology
Dendritic Spines - metabolism
Dendritic Spines - pathology
Depressive Disorder, Major - etiology
Development and progression
Dosage and administration
Drug therapy
Enzyme Repression
Female
Gene Transfer Techniques
Hippocampus - enzymology
Hippocampus - metabolism
Hippocampus - pathology
Humans
Immediate-Early Proteins - antagonists & inhibitors
Immediate-Early Proteins - genetics
Immediate-Early Proteins - metabolism
Kinases
Male
Middle Aged
Nerve Tissue Proteins - genetics
Nerve Tissue Proteins - metabolism
Neurons - enzymology
Neurons - metabolism
Neurons - pathology
Patient outcomes
Post traumatic stress disorder
Prefrontal Cortex - enzymology
Prefrontal Cortex - metabolism
Prefrontal Cortex - pathology
Protein-Serine-Threonine Kinases - antagonists & inhibitors
Protein-Serine-Threonine Kinases - genetics
Protein-Serine-Threonine Kinases - metabolism
Rats, Sprague-Dawley
Rodents
Signal Transduction
Stress Disorders, Post-Traumatic - metabolism
Stress Disorders, Post-Traumatic - pathology
Stress Disorders, Post-Traumatic - psychology
Synaptic Transmission
Tissue Banks
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Title Decreased SGK1 Expression and Function Contributes to Behavioral Deficits Induced by Traumatic Stress
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