Abstract
Maneb (MB) and paraquat (PQ) are environmental toxins that have been experimentally used to induce selective damage of dopaminergic neurons leading to the development of Parkinson’s disease (PD). Although the mechanism of this selective neuronal toxicity in not fully understood, oxidative stress has been linked to the pathogenesis of PD. The present study investigates the mechanisms of neuroprotection elicited by Withania somnifera (Ws), a herb traditionally recognized by the Indian system of medicine, Ayurveda. An ethanolic root extract of Ws was co-treated with the MB–PQ induced mouse model of PD and was shown to significantly rescue canonical indicators of PD including compromised locomotor activity, reduced dopamine in the substantia nigra and various aspects of oxidative damage. In particular, Ws reduced the expression of iNOS, a measure of oxidative stress. Ws also significantly improved the MB + PQ mediated induction of a pro-apoptotic state by reducing Bax and inducing Bcl-2 protein expression, respectively. Finally, Ws reduced expression of the pro-inflammatory marker of astrocyte activation, GFAP. Altogether, the present study suggests that Ws treatment provides nigrostriatal dopaminergic neuroprotection against MB–PQ induced Parkinsonism by the modulation of oxidative stress and apoptotic machinery possibly accounting for the behavioural effects.
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Acknowledgments
Authors are thankful to the Head, Department of Biochemistry and Zoology, BHU for providing the basic departmental and cryostat facility, respectively. We sincerely thank Indian Council of Medical Research, New Delhi for providing fellowship to Jay Prakash and Sachchida Nand Rai, Council of Scientific and Industrial Research, New Delhi for providing fellowship to Satyndra Kumar Yadav, Department of Science and Technology, New Delhi, for providing fellowship to Shikha Chouhan.
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Prakash, J., Chouhan, S., Yadav, S.K. et al. Withania somnifera Alleviates Parkinsonian Phenotypes by Inhibiting Apoptotic Pathways in Dopaminergic Neurons. Neurochem Res 39, 2527–2536 (2014). https://doi.org/10.1007/s11064-014-1443-7
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DOI: https://doi.org/10.1007/s11064-014-1443-7