Impact of epigallo catechin-3-gallate on acetylcholine-acetylcholine esterase cycle in aged rat brain

Abstract

Neurotransmission plays an important role in communication of messages in brain. Cholinergic alterations during aging are associated with learning and memory. Neurotransmitters and enzymes that influence these neurotransmitters are significant in age-associated memory. Neurotransmitters like acetylcholine, serotonin and dopamine levels were studied. Kinetics of acetylcholine esterase was studied. There was an alteration in km and Vm values which was brought back to near-normalcy by EGCG. Behavioural changes were assessed by radial maze experiment. EGCG, a good neuroprotective drug proved to alleviate the behavioural alterations in aged rat brain. Acetylcholine esterase was partially purified from rat brain and assayed in vitro. Several modifiers like EGCG and donepezil were added in silico and the activity of the enzyme was calculated. EGCG increased the activity when compared to negative control, donepezil. Using bioinformatics tools EGCG, acetylcholine and donepezil were docked with acetylcholine esterase. EGCG formed a good docking-complex with the enzyme. Thus, it shall be hypothesized that the neuroprotective activity of EGCG might be due to its influence on cholinergic neurotransmission thereby improving the cognitive functions of the brain.