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Protective effect of tangeritin in transgenic Drosophila model of Parkinson's disease.

Parkinson's disease (PD) is a neurodegenerative disorder caused due to the loss of dopaminergic neurons in substantia nigra region of midbrain. The disease is characterized by the accumulation of alpha-synuclein into depositions known as lewy bodies. Till date there is no cure for PD but the limited number of medications may provide temporary relief from the PD symptoms. Flavonoids are a group of polyphenols found in plants. The health benefits of flavonoids have been universally accepted. Tangeritin is a pentamethoxy flavone found in the peels of Mandarin oranges (Citrus reticulata). The present study was conducted to study the effect of tangeritin on the symptoms of PD exhibited by the PD model transgenic flies (Drosophila melanogaster). Tangeritin at a final concentration of 5, 10 and 20 microM was added to the diet and the flies were allowed to feed on it for 24 days. At the same time other set of PD flies were allowed to feed on a diet having 10-3 M of L-Dopa. The effect of tangeritin was studied on the activity pattern, climbing ability, dopamine content, oxidative stress markers (lipid peroxidation, reduced glutathione, glutathione-S-transferase, protein carbonyl content and monoamine oxidase activity) and on the histopathology of the brain of PD model flies. The study showed that the exposure of PD flies to different doses of tangeritin showed a marked delay in the loss of climbing ability and increase in the dopamine content. Tangeritin also showed a reduction in various oxidative stress markers. Hence it is concluded that tangeritin showed a marked reduction in the PD symptoms and thus could be of great importance for further research in treating PD.