Browsing by Author "Omoola, O. O."

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    Thymoquinone ameliorate oxidative stress, GABAergic neuronal depletion and memory impairment through Nrf2/ARE signaling pathway in the dentate gyrus following cypermethrin administration
    (BMC Neuroscience, 2024) Imam, A. L.; Okesina, A. A.; Sulaimon, F. A.; Imam, A.; Ibiyeye, R. Y.; Oyewole, L. A.; Biliaminu, S. A.; Shehu, M.; Alli, A. O.; Omoola, O. O.; Ajao, M.S.
    Background Exposure to chemical toxins, including insecticides, harms bodily organs like the brain. This study examined the neuroprotective of thymoquinone on the cypermethrin’s harmful effects on the histoarchitecture of the dentate gyrus and motor deficit in the dentate gyrus. Methods Forty adult male rats (180–200 g) were randomly divided into 5 groups (n=8 per group). Groups I, II, III, IV, and V received oral administration of 0.5 ml of phosphate-buffered saline, cypermethrin (20 mg/kg), thymoquinone (10 mg/kg), cypermethrin (20 mg/kg)+thymoquinone (5 mg/kg), and cypermethrin (20 mg/kg)+thymoquinone (10 mg/kg) for 14 days respectively. The novel object recognition test that assesses intermediate-term memory was done on days 14 and 21 of the experiment. At the end of these treatments, the animals were euthanized and taken for cytoarchitectural (hematoxylin and eosin; Cresyl violet) and immunohistochemical studies (Nuclear factor erythroid 2-related factor 2 (Nrf2), Parvalbumin, and B-cell lymphoma 2 (Bcl2). Result The study shows that thymoquinone at 5 and 10 mg/kg improved Novelty preference and discrimination index. Thymoquinone enhanced Nissl body integrity, increased GABBAergic interneuron expression, nuclear factor erythroid 2-derived factor 2, and enhanced Bcl-2 expression in the dentate gyrus. It also improved the concentration of nuclear factor erythroid 2-derived factor 2, increased the activities of superoxide dismutase and glutathione, and decreased the concentration of malondialdehyde level against cypermethrin-induced neurotoxicity. Conclusion thymoquinone could be a therapeutic agent against cypermethrin poisoning.
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    Thymoquinone Ingestions Reversed Inflammation Driven Glia activation and Impaired Cognitive associated behavior in Cypermethrin Exposed Rats.
    (Uskudar University, 2024) Imam, A. L.; Okesina, A. A.; Sulaimon, F. A.; Imam, A.; Ibiyeye, R. Y.; Adana, M. Y.; Omoola, O. O.; Ajao, M. S.
    Background: Pyrethroids pose health risks to humans. Therefore, it is imperative to assess the preventive benefits of thymoquinone against neurotoxicity induced by cypermethrin- in the hippocampal dentate gyrus. Methods: Forty male adult Wistar rats with an average weight of 180-200g were randomly allocated to five (5) groups, and each comprising eight rats (n=8 per group). The groups were designated as follows, through oral administrations for 14 days: 0.5ml phosphate- buffered saline (PBS) was given to group one; Group two received 20mg/kg of cypermethrin (CYM); Group three received 10 mg/kg of thymoquinone (THQ); Group four received 20 mg/kg of cypermethrin followed by 10mg/kg of thymoquinone (CYM-10mgTHQ); and Group five received 20mg/kg and 5mg/kg cypermethrin and thymoquinone respectively (CYM-5mgTHQ). Behavioral, histological, immunohistochemical, and biochemical analyses were conducted post-treatment. Results: Cypermethrin administration caused the rise in pro-inflammatory cytokine TNF-α and increased expression of astrocytes, microglia, and pro-apoptotic protein Bax. Additionally, cypermethrin reduced levels of anti-inflammatory cytokine IL-10, acetylcholinesterase (AChE) activity, and nuclear factor erythroid 2-related factor 2 (Nrf2). cytoarchitectural disruption of dentate gyrus and decreased Nrf2 expression were observed. Cognitive deficits were evident. Thymoquinone treatment attenuated TNF-α elevation, reduced astrocyte, microglial, and Bax expression, and increased IL-10, AChE, and Nrf2 levels. Conclusion: Thymoquinone demonstrated anti-inflammatory and anti-apoptotic effects against cypermethrin-induced neurotoxicity, improving cognitive function in rats.