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5-Desmethylnobiletin augments synaptic ACh levels and nicotinic ACh receptor activity: A potential candidate for alleviation of cholinergic dysfunction.

Neuroscience Letters 2017 September 15
Cholinergic function is compromised in plethora of neurodegenerative disorders especially Alzheimer's disease. Increasing acetylcholine (ACh) levels has been the mainstay in majority of the therapeutic regimens, accepted for management of disease. The present study investigates the efficacy of 5-Desmethylnobiletin (DN), a polymethoxyflavone in augmenting cholinergic function using Caenorhabditis elegans as a model organism. The studies revealed significant elevation in cholinergic transmission mediated through increased levels of ACh and activity of nicotinic acetylcholine receptors (nAChR). Further investigation into the mechanistic aspects indicated that DN enhanced cholinergic function through down modulation of acetylcholinesterase activity at enzyme and transcript level along with upregulation of non alpha subunit, unc-29 which could be linked with enhanced nAChR activity as evident from levamisole assay. Additionally, studies on antioxidant properties, implicated significant potential of DN in curtailing ROS, both in vivo and in vitro. Our studies present DN as a phytomolecule with novel biological activities which could be exploited and researched upon for therapeutic avenues in terms of cholinergic function and antioxidant potential.

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