Sex-Dependent Ketamine Addiction-Like Behavior Profile Following Exposure to Chronic Mild Stress.

Autor:	Wright KN; Department of Biomedical Sciences, Florida State University, Tallahassee, FL, USA., Hagarty DP; Department of Biomedical Sciences, Florida State University, Tallahassee, FL, USA., Strong CE; Department of Biomedical Sciences, Florida State University, Tallahassee, FL, USA., Schoepfer KJ; Department of Biomedical Sciences, Florida State University, Tallahassee, FL, USA., Kabbaj M; Department of Biomedical Sciences, Florida State University, Tallahassee, FL, USA.
Jazyk:	angličtina
Zdroj:	Chronic stress (Thousand Oaks, Calif.) [Chronic Stress (Thousand Oaks)] 2019 Jan-Dec; Vol. 3. Date of Electronic Publication: 2019 Feb 27.
DOI:	10.1177/2470547019832613
Abstrakt:	Background: Ketamine has rapid antidepressant effects and shows great promise as a novel treatment for depression, but its limitations including its abuse potential are poorly understood. Given that the prevalence of depression is twice as high in women as in men and that depression and substance use disorders are highly comorbid, we hypothesized that a sex-specific responsivity to behavioral assays that characterize addiction-like behavior may arise in rats with prior exposure to chronic stress and therapeutically relevant ketamine. Methods: Male and female rats that underwent chronic mild stress were treated with four 1.47 mg/kg intravenous ketamine infusions once every fourth day and underwent operant self-administration of 0.5 mg/kg/infusion ketamine. Measures of anhedonia (or lack of pleasure, a signature feature of depression), anxiety-induced neophagia, motivation to obtain ketamine, and craving were assessed using the sucrose intake test, novelty-suppressed feeding test, progressive ratio schedule of reinforcement, and incubation of craving following abstinence, respectively. Finally, dendritic spine density in the nucleus accumbens core was measured. Results: Ketamine infusions reduced anxiety-induced neophagia in both male rats and female rats but had no effect on measures of anhedonia. Female rats with prior exposure to chronic mild stress had greater motivation to obtain ketamine compared to nonstressed female rats, an effect not observed in male rats. Additionally, female rats who received antidepressant ketamine infusions had a higher threshold for displaying ketamine addiction-like behavior than saline-treated female rats as well as increased thin spine density in the nucleus accumbens core. These effects were not observed in male rats. Conclusion: This study shows that repeated low-dose ketamine does not increase abuse potential of subsequent ketamine. It also highlights an important female-specific effect of stress to increase ketamine addiction-like behavior, which requires further investigation for clinical populations. Competing Interests: Declaration of Conflicting Interests The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Databáze:	MEDLINE
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