Abstract
Metabolic dysfunction is a critical step in the etiopathogenesis of Alzheimer’s disease. In this progressive neurological disorder, impaired zinc homeostasis has a key role that needs to be clarified. The aim of this study was to investigate the effect of zinc deficiency and administration on hippocampal Nogo-A receptor and osteocalcin gene expression in rats injected with intracerebroventricular streptozotocin (icv-STZ). Forty male Wistar rats were divided into 5 groups in equal numbers: Sham 1 group received icv artificial cerebrospinal fluid (aCSF); Sham 2 group received icv a CSF and i.p. saline; STZ group received 3 mg/kg icv STZ; STZ-Zn-deficient group received 3 mg/kg icv STZ and fed a zinc-deprived diet; STZ-Zn-supplemented group received 3 mg/kg icv STZ and i.p. zinc sulfate (5 mg/kg/day). Hippocampus tissue samples were taken following the cervical dislocation of the animals under general anesthesia. Nogo-A receptor and osteocalcin gene expression levels were determined by real-time-PCR method. Zinc supplementation attenuated the increase in hippocampal Nogo-A receptor gene expression, which was significantly increased in zinc deficiency. Again, zinc supplementation upregulated the intrinsic protective mechanisms of the brain by activating osteocalcin-expressing cells in the brain. The results of the study show that zinc has critical effects on Nogo-A receptor gene expression and hippocampal osteocalcin gene expression levels in the memory-sensitive rat hippocampus that is impaired by icv-STZ injection. These results are the first to examine the effect of zinc deficiency and supplementation on hippocampal Nogo-A receptor and osteocalcin gene expression in icv-STZ injection in rats.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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We thank Dr. Serhan Ozyıldırım for the English revision.
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This study was supported by the Scientific Research Projects Coordinatorship of Selcuk University (SUBAPK; project no. 19102046).
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HG, SBB, OU, and EGM made substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data; or the creation of new software used in the work. HG, SBB, RM, and AKB drafted the work or revised it critically for important intellectual content and approved the version to be published.
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The study protocol was approved by the Experimental Animals Ethics Committee of Selcuk University Experimental Medicine Research and Application Center (2019–44).
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Gumus, H., Baltaci, S.B., Unal, O. et al. Zinc Ameliorates Nogo-A Receptor and Osteocalcin Gene Expression in Memory-Sensitive Rat Hippocampus Impaired by Intracerebroventricular Injection of Streptozotocin. Biol Trace Elem Res 201, 3381–3386 (2023). https://doi.org/10.1007/s12011-022-03410-4
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DOI: https://doi.org/10.1007/s12011-022-03410-4