Abstract
Repeated manganese (Mn) exposure may cause increased production of reactive oxygen species (ROS), with a consequent imbalance in the glutathione (GSH) antioxidant defence system, resulting in cellular dysfunctions, and eventually cell death, particularly in the brain. d-ribose-l-cysteine (RibCys) has been demonstrated to effectively promote the synthesis of glutathione, a potent neutralizer of ROS. In the present study, we examined the effects of RibCys on glutathione levels, apoptotic and astrocytic responses, neuronal ultrastructural integrity, following Mn exposure. Wild-type rats were exposed to either saline, Mn, or/and RibCys for 2 weeks. The Mn-exposed rats received RibCys either as pre-, co-, or post-treatments. Mn caused a marked decrease in GSH levels, overexpression of GFAP and caspase-3, reflecting astrocytosis and apoptosis, and altered ultrastructural integrities of the neuronal nuclei, mitochondria, and myelin sheath of the striatum and motor cortex respectively, while all interventions with RibCys minimized and prevented the neurotoxic events. Our study demonstrates that RibCys effectively attenuates the neurotoxic effects of Mn and may be useful as a therapeutic strategy against neurological consequences of Mn overexposure.
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05 September 2023
A Correction to this paper has been published: https://doi.org/10.1007/s12640-023-00665-0
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Acknowledgements
GTA acknowledges the support of the International Society of Neurochemistry (ISN) CAEN 1A grant and the Company of Biologists DMMJ Traveling Fellowship.
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OMI was supported by the International Brain Research Organization (IBRO) Return Fellowship 2018 and Young IBRO Connecting Regions Award 2019. MA is supported by the National Institute of Health (NIH), USA grants; NIEHS R01 10563 and NIEHS R01 07331.
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All experimental protocols were in strict accordance with the guidelines for animal research, as detailed in the Guide for the Care and Use of Laboratory Animals (National Research Council 2011), and approved by the Institutional Ethical Review Committee (UERC/ASN/2019/1741), University of Ilorin, Nigeria.
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d-ribose-l-cysteine was a gift to OM Ijomone from Max International, USA. However, Max International had no input into the conception, design, and execution of the research, as well as no input into the decision to publish. Authors declare no other known or perceived conflict of interest.
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Akingbade, G.T., Ijomone, O.M., Imam, A. et al. d-Ribose-l-Cysteine Improves Glutathione Levels, Neuronal and Mitochondrial Ultrastructural Damage, Caspase-3 and GFAP Expressions Following Manganese-Induced Neurotoxicity. Neurotox Res 39, 1846–1858 (2021). https://doi.org/10.1007/s12640-021-00404-3
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DOI: https://doi.org/10.1007/s12640-021-00404-3