Abstract
Neuroimmune alterations have important implication in the neuropsychiatric symptoms and biochemical changes associated with lead-induced neurotoxicity. It has been suggested that inhibition of neuroinflammatory-mediated lead-induced neurotoxicity by phytochemicals enriched with antioxidant activities would attenuate the deleterious effects caused by lead. Hence, this study investigated the neuroinflammatory mechanism behind the effect of Ginkgo biloba supplement (GB-S) in lead-induced neurotoxicity in mice brains. Mice were intraperitoneally pretreated with lead acetate (100 mg/kg) for 30 min prior the administration of GB-S (10 and 20 mg/kg, i.p.) and ethylenediaminetetraacetic acid (EDTA) (50 mg/kg, i.p.) for 14 consecutive days. Symptoms of neurobehavioral impairment were evaluated using open field test (OFT), elevated plus maze (EPM), and tail suspension test (TST) respectively. Thereafter, mice brain hippocampi were sectioned for myeloperoxidase activity (MPO), pro-inflammatory cytokine (TNF-α and IL-6) estimation and inflammatory protein (NF-κB) expression. Furthermore, histomorphormetric studies (Golgi impregnation and Cresyl violet stainings) were carried out. GB-S (10 and 20 mg/kg) significantly restores neurobehavioral impairments based on improved locomotion, reduced anxiety- and depressive-like behavior. Moreover, GB-S reduced the MPO activity, inhibits TNF-α, IL-6 release, and downregulates NF-κB immunopositive cell expression in mice hippocampus. Histomorphometrically, GB-S also prevents the loss of pyramidal neuron in the hippocampus. The endpoint of this findings suggest that GB-S decreases neuropsychiatric symptoms induced by lead acetate through mechanisms related to inhibition of release of pro-inflammatory mediators and suppression of hippocampal pyramidal neuron degeneration in mice.
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Acknowledgements
Authors appreciate the technical assistant rendered during this study by Mr. Savior Inegbenehi and Mr. Martin U. Ukiwa of the Department of Biochemistry and Pharmacology, PAMO University Medical Sciences, Port Harcourt.
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Olusegun G. Adebayo—designed, managed the laboratory experiment and wrote the first draft of the manuscript. Benneth Ben-Azu—contributed in the design of the experiment, managed the laboratory experiment and participated in the writing of the manuscript. Abayomi M. Ajayi—managed the statistical analysis and participated in the writing of the manuscript. Iheanyichukwu Wopara—managed the laboratory experiment and statistical analysis. Wadioni Aduema—managed the laboratory experiment and statistical analysis. Tolunigba A. Kolawole—provided the materials for the study and managed the laboratory experiment. Elizabeth B. Umoren—managed the laboratory experiment and methodology. Ijeoma Onyeleonu—managed the laboratory experiment and methodology. Oloruntoba T. Ebo—provided the materials for the study and managed the literature searches. Doris N. Ajibo—Provided the materials for the study and managed the literature searches. Ajirioghene E. Akpotu—managed the literature searches and methodology. All authors read and approved the submission of the manuscript.
The institution, PAMO University of Medical Sciences Animal Research Ethics Committee (PUMS-AREC) which agreed with the “Guide to the care and use of laboratory animals in research and teaching” as prescribed in NIH publications volume 25 No.28 revised in 1996 approved the use of animal for this study
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Adebayo, O.G., Ben-Azu, B., Ajayi, A.M. et al. Gingko biloba abrogate lead-induced neurodegeneration in mice hippocampus: involvement of NF-κB expression, myeloperoxidase activity and pro-inflammatory mediators. Biol Trace Elem Res 200, 1736–1749 (2022). https://doi.org/10.1007/s12011-021-02790-3
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DOI: https://doi.org/10.1007/s12011-021-02790-3