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ORIGINAL RESEARCH ARTICLE

Repeated ketamine doses elevate superoxide dismutase activity in a pharmacological model of schizophrenia-like phenotypes in mice

Yusuf Usman1* ,  Adegbuyi Oladele Aderibigbe2 ,  Fatai Adewale Fehintola2
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1 Department of Pharmacology, Faculty of Basic Medical Sciences, Federal University of Health Sciences Ila-Orangun, Ila-Orangun, Osun State, Nigeria
2 Department of Pharmacology, Faculty of Basic Medical Sciences University of Ibadan, Ibadan, Oyo State, Nigeria
INNOSC Theranostics and Pharmacological Sciences, 6372 https://doi.org/10.36922/itps.6372
Submitted: 20 November 2024 | Revised: 12 February 2025 | Accepted: 17 February 2025 | Published: 28 February 2025
© 2025 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

This study evaluated behavioral phenotypes and superoxide dismutase (SOD) enzymatic activity in a repeated sub-anesthetic dose of ketamine (KET) administered to model schizophrenia in an animal study. The animals were divided into three (3) experimental groups. The KET alone group received sub-anesthetic dose of KET (20 mg/kg) for 14 consecutive days. The control group vehicle (VEH) received distilled water (10 mL/kg) as a VEH, while the KET and risperidone (RISP) group (KET + RISP) received a sub-anesthetic dose of KET (20 mg/kg) alone for 7 consecutive days, followed by RISP (0.5 mg/kg) administered 1-h post-KET treatment from days 8 to 14. All treatments were administered intraperitoneally (i.p.). Twenty-four hours after the last treatment, behavioral phenotypes (locomotor activity and cognition) were assessed using the locomotor activity cage and the elevated plus maze (EPM). Thereafter, SOD enzymatic activity was evaluated in homogenized brain tissue from each mouse using spectrophotometric analysis. Animals that received KET (20 mg/kg i.p) alone showed a significant (P < 0.05) increase in movement counts and rearing events in the locomotor activity test. It also prolonged the latency to enter the open arms during the anxiety-induced cognitive assessment in the EPM, compared to animals that received distilled water or those that received KET and RISP. SOD enzymatic activity was significantly elevated in the KET group compared to the VEH and KET + RISP groups. The elevated SOD enzymatic activity may represent a compensatory response to the oxidative stress induced by repeated sub-anesthetic doses of KET.

Keywords
Superoxide dismutase
Ketamine
Schizophrenia
Phenotypes
Mice
Model
Funding
None.
Conflict of interest
The authors declare that they have no competing interests.
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INNOSC Theranostics and Pharmacological Sciences, Electronic ISSN: 2705-0823 Print ISSN: 2705-0734, Published by AccScience Publishing
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