Abstract
Glutamate in monosodium glutamate (MSG), which is widely used in the food industry, has an important role in major brain functions such as memory, learning, synapse formation, and stabilization. However, extensive use of MSG has been linked with neurotoxicity. Therefore, in addition to clarifying the underlying mechanisms of MSG-induced neurotoxicity, it is also important to determine safe agents that can diminish the damage caused by MSG. Tannic acid (TA) is a naturally occurring plant polyphenol that exhibits versatile physiological effects such as anti-inflammatory, anti-carcinogenic, antioxidant, and radical scavenging. This study was conducted to assess the neurotoxic and neuroprotective effects of these two dietary components in the rat cerebral cortex. Twenty-four Sprague Dawley rats were divided into 4 equal groups and were treated with MSG (2 g/kg) and TA (50 mg/kg) alone and in combination for 3 weeks. Alterations in oxidative stress indicators (MDA and GSH) were measured in the cortex tissues. In addition, changes in enzymatic activities and gene expression patterns of antioxidant system components (GST, GPx, CAT, and SOD) were investigated. Furthermore, mRNA expressions of FoxO transcription factors (Foxo1 and Foxo3) and apoptotic markers (Casp3 and Casp9) were assessed. Results revealed that dietary TA intake significantly rehabilitated MSG-induced dysregulation in cortical tissue by regulating redox balance, cellular homeostasis, and apoptosis. The present study proposes that MSG-induced detrimental effects on cortical tissue are potentially mitigated by TA via modulation of oxidative stress, cell metabolism, and programmed cell death.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CAT:
-
Catalase
- cDNA:
-
Complementary DNA
- GPx:
-
Glutathione peroxidase
- GSH:
-
Glutathione
- GST:
-
Glutathione S-transferase
- MDA:
-
Malondialdehyde
- MSG:
-
Monosodium glutamate
- qPCR:
-
Quantitative polymerase chain reaction
- RNA:
-
Ribonucleic acid
- SOD:
-
Superoxide dismutase
- TA:
-
Tannic acid
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The present study was supported by the Ataturk University Scientific Research Project Coordination Unit (Grant Number: FYL-2021–9271).
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HC conceived the study and designed experiments. HC and MSK performed experiments and analyzed the results. HC wrote the main manuscript. All authors reviewed and edited the final manuscript.
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Karagac, M.S., Ceylan, H. Neuroprotective Potential of Tannic Acid Against Neurotoxic Outputs of Monosodium Glutamate in Rat Cerebral Cortex. Neurotox Res 41, 670–680 (2023). https://doi.org/10.1007/s12640-023-00667-y
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DOI: https://doi.org/10.1007/s12640-023-00667-y