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In a mouse model relevant for post-traumatic stress disorder, selective brain steroidogenic stimulants (SBSS) improve behavioral deficits by normalizing allopregnanolone biosynthesis.

Abstract：

:The pathophysiological role of the neurosteroid 3alpha-hydroxy-5alpha-pregnan-20-one (allopregnanolone) in neuropsychiatric disorders has been highlighted in several recent investigations. For instance, allopregnanolone levels are decreased in the CSF of patients with post-traumatic stress disorder (PTSD) and major unipolar depression. Neurosteroidogenic antidepressants, including fluoxetine and analogs, correct this decrease in a manner that correlates with improved depressive symptoms. PTSD-like behavioral dysfunctions, including heightened aggression, exaggerated fear, and anxiety-like behavior associated with a decrease in corticolimbic allopregnanolone content are modeled in mice by protracted social isolation stress. Allopregnanolone is not only synthesized by principal glutamatergic and gamma-aminobutyric acid (GABA)ergic neurons, but also locally, potently, positively, and allosterically modulates GABA action at postsynaptic and extrasynaptic GABAA receptors. Hence, this paper will review preclinical studies, which show that in socially isolated mice, rather than selective serotonin reuptake inhibitor mechanisms, allopregnanolone biosynthesis in glutamatergic corticolimbic neurons offers a nontraditional target for fluoxetine to decrease signs of aggression, normalize fear responses, and decrease anxiety-like behavior. At low selective serotonin reuptake inhibitor-inactive doses, fluoxetine and related congeners potently increase allopregnanolone levels by acting as potent selective brain steroidogenic stimulants (SBSS), thereby facilitating GABAA receptor neurotransmission and improving behavioral dysfunctions. Although the precise molecular mechanisms that underlie the action of these drugs are not fully understood, findings from socially isolated mice may ultimately generate insights into novel drug targets for the treatment of psychiatric disorders, such as anxiety and panic disorders, depression, and PTSD.

journal_name

Behav Pharmacol

journal_title

Behavioural pharmacology

authors

Pinna G

doi

10.1097/FBP.0b013e32833d8ba0

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

438-50

issue

5-6

eissn

0955-8810

issn

1473-5849

pii

00008877-201009000-00008

journal_volume

pub_type

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In a mouse model relevant for post-traumatic stress disorder, selective brain steroidogenic stimulants (SBSS) improve behavioral deficits by normalizing allopregnanolone biosynthesis.