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Neuropsychopharmacology. 2015 Sep;40(10):2443-53. doi: 10.1038/npp.2015.95. Epub 2015 May 10.

ApoE2 Exaggerates PTSD-Related Behavioral, Cognitive, and Neuroendocrine Alterations.

Author information

1
Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, USA.
2
Department of Neurology, Oregon Health and Science University, Portland, OR, USA.
3
1] Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, USA [2] Department of Neurology, Oregon Health and Science University, Portland, OR, USA [3] Department of Radiation Medicine and Division of Neuroscience, ONPRC, Oregon Health and Science University, Beaverton, OR, USA.

Abstract

Apolipoprotein E (apoE) is an essential component of lipoprotein particles in both the brain and periphery, and exists in three isoforms in the human population: E2, E3, and E4. ApoE has numerous, well-established roles in neurobiology. Most notably, E4 is associated with earlier onset and increased risk of Alzheimer's disease (AD). Although possession of E2 is protective in the context of AD, E2 appears to confer an increased incidence and severity of posttraumatic stress disorder (PTSD). However, the biological processes underlying this link remain unclear. In this study, we began to elucidate these associations by examining the effects of apoE on PTSD severity in combat veterans, and on PTSD-like behavior in mice with human apoE. In a group of 92 veterans with PTSD, we observed significantly higher Clinician-Administered PTSD Scale and PTSD Checklist scores in E2+ individuals, as well as alterations in salivary cortisol levels. Furthermore, we measured behavioral and biological outcomes in mice expressing human apoE after a single stressful event as well as following a period of chronic variable stress, a model of combat-related trauma. Mice with E2 showed impairments in fear extinction, and behavioral, cognitive, and neuroendocrine alterations following trauma. To the best of our knowledge, these data constitute the first translational demonstration of PTSD severity in men and PTSD-like symptoms in mice with E2, and point to apoE as a novel biomarker of susceptibility, and potential therapeutic target, for PTSD.

PMID:
25857685
PMCID:
PMC4538360
DOI:
10.1038/npp.2015.95
[Indexed for MEDLINE]
Free PMC Article

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