Abstract
Parkinson’s disease (PD) is a common and severe neurodegenerative disorder associated with a selective loss of dopaminergic neurons in substantia nigra pars compacta. The crucial role of oxidative stress and inflammation in PD onset and progression is evident. It has been proven that garlic extract (GE) protects the cells from oxidative stress, inflammation, mitochondrial dysfunction and apoptosis. That is, we aimed to investigate if GE reveals protective features on the preclinical model of PD. The study has been designed to evaluate both preventive (GE administered before 6-OHDA injection) and therapeutic (GE administered after 6-OHDA injection) effects of GE on the animal model. Forty male Wistar rats were divided into 4 groups including control, lesion, treatment I (received GE before 6-OHDA injection) and treatment II (received GE both before and after 6-OHDA injection). At the end of treatment, hanging, rotarod, open field and passive avoidance tests as well as immunohistochemistry were performed to evaluate the neuroprotective effects of garlic against PD. Our immunohistochemistry analysis revealed that the tyrosine hydroxylase positive cells (TH+) in GE treated groups were significantly higher (p˂0.001) than the lesion group. The motor deficiency significantly improved in hanging, rotarod, open-field and apomorphine-induced rotational tests. We observed an attenuation in memory impairment induced by PD on GE treated group. Therefore, we found that GE protects dopaminergic neurons in 6-OHDA-induced neurotoxicity and ameliorates movement disorders and behavioral deficits.
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Acknowledgements
The data acquired from this research were extracted from MSc student thesis (961863), which was financially supported by the Vice-Chancellor for Research, Mashhad University of Medical Sciences, Mashhad, Iran. Also, the authors would like to thank Mrs. Motejaded for her technical assistance.
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Bigham, M., Mohammadipour, A., Hosseini, M. et al. Neuroprotective effects of garlic extract on dopaminergic neurons of substantia nigra in a rat model of Parkinson’s disease: motor and non‐motor outcomes. Metab Brain Dis 36, 927–937 (2021). https://doi.org/10.1007/s11011-021-00705-8
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DOI: https://doi.org/10.1007/s11011-021-00705-8