Effects of Cyperus Esculentus Infused Diet on the Hippocampus in Rotenone-Induced Parkinson-like Disease Model in adult male Wistar Rats; a preliminary study.
The tiger nut-infused diet may offer partial neuroprotective benefits against hippocampal damage in a rat model of Parkinson's disease, but further research is needed to confirm these effects in humans.
Where it sits
this study against the rest of the glutathione (gsh) corpusSummary and findings
This study evaluated the neuroprotective efficacy of a tiger nut-infused diet on the hippocampus in a rotenone-induced Parkinson disease model using male Wistar rats. The rats received either a control diet, a tiger nut-infused diet, rotenone (2 mg/kg), or rotenone with a tiger nut-infused diet for 28 days. The findings suggested that the tiger nut-infused diet partially attenuated the effects of rotenone on hippocampal neurotoxicity.
Abstract
Parkinson disease is a progressive neurodegenerative disorder contributing to cognitive decline and memory impairment beyond its characteristic motor deficits. Rotenone, a mitochondrial complex I inhibitor, reliably reproduces both the motor and non-motor features of Parkinson disease in experimental models. Tiger nut (Cyperus esculentus) is a commonly consumed plant known for its antioxidant and anti-inflammatory properties; however, its neuroprotective efficacy against rotenone-induced hippocampal damage is not yet fully elucidated. This study, therefore, evaluated the neuroprotective efficacy of tiger nut-infused diet on the hippocampus in a rotenone-induced Parkinson disease model using male Wistar rats. Thirty-two male Wistar rats weighing between 100 g to 150 g were obtained from the Animal Holding facility of Babcock University, Ilishan-Remo, Ogun State. The rats were randomly assigned into four groups (A, B, C and D) (n = 8). Group A served as the control and received normal rat chow and sunflower oil. Group B received tiger nut-infused diet only. Group C received rotenone (2 mg/kg) intraperitoneally. Group D received rotenone (2 mg/kg) concurrently with tiger nut-infused diet for 28 days. Neurobehavioral assessments were conducted using the open field test and Y-maze tests. Oxidative stress biomarkers, including malondialdehyde, catalase, and glutathione, were assayed from hippocampal homogenates, and gamma-aminobutyric acid was measured as a neurotransmitter parameter. Histological evaluation was performed using hematoxylin and eosin for general cytoarchitecture, Cresyl Fast Violet for Nissl substance integrity, and Luxol Fast Blue for myelin visualization. Data were analyzed using One-way ANOVA followed by the Student Newman-Keuls post-hoc test on GraphPad Prism 9.0, with significance set at p ≤ 0.05. Rotenone administration produced significant impairments in locomotor activity and spatial working memory, reduced catalase activity, and caused marked histopathological alterations in the hippocampus, including neuronal vacuolation, chromatolysis, and myelin disruption. Tiger nut-infused diet partially attenuated these effects, most notably by enhancing catalase activity and preserving hippocampal cytoarchitecture compared to the rotenone-only group. This study concludes that tiger nut-infused diet demonstrates partial neuroprotective potential against rotenone-induced hippocampal neurotoxicity, with implications for dietary intervention in Parkinson-like disease-related cognitive decline. Further studies involving phytochemical screening of the tiger nut-infused diet are recommended to identify and isolate the specific active ingredient responsible for its neuroprotective effects, enabling investigation of its mechanisms of action at the molecular level.
Background
This paper addresses the neuroprotective effects of dietary interventions in the context of Parkinson disease, a condition characterized by both motor and non-motor symptoms. Previous research has indicated that antioxidants may play a role in mitigating neurodegeneration. The study is significant as it explores the potential of tiger nut, a commonly consumed plant, in protecting against hippocampal damage induced by rotenone.
Methods
The study utilized a randomized design with 32 male Wistar rats, divided into four groups of eight. Group A served as the control, Group B received a tiger nut-infused diet, Group C received rotenone (2 mg/kg) intraperitoneally, and Group D received both rotenone and the tiger nut diet for 28 days. Primary outcomes included neurobehavioral assessments and oxidative stress biomarkers.
Results
Rotenone administration resulted in significant impairments in locomotor activity and spatial working memory. The study reported reduced catalase activity and marked histopathological alterations in the hippocampus, including neuronal vacuolation and myelin disruption. The tiger nut-infused diet was found to enhance catalase activity and preserve hippocampal cytoarchitecture compared to the rotenone-only group.
Interpretation
The findings suggest that while the tiger nut diet shows some neuroprotective potential, the effect sizes may not be clinically meaningful given the limitations of the animal model. The study's small sample size and lack of long-term follow-up further confound the conclusions. This research adds to the body of literature on dietary interventions but requires further investigation to establish clinical relevance.
Key findings
- Rotenone administration (2 mg/kg) produced significant impairments in locomotor activity and spatial working memory.
- Rotenone caused a reduction in catalase activity, with significant histopathological alterations in the hippocampus.
- Tiger nut-infused diet enhanced catalase activity compared to the rotenone-only group.
- Neuronal vacuolation, chromatolysis, and myelin disruption were observed in the rotenone-only group.
- Significance was set at p ≤ 0.05.
Limitations
- small n=32
- rodent only, no human data
- 28-day duration may not capture long-term effects
- no specific active ingredient identified
- single-site study