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The Neuropharmacology of L-Theanine(N-Ethyl-L-Glutamine): A Possible Neuroprotective and Cognitive Enhancing Agent

Pradeep J. Nathan PhD, Behavioural Neuroscience Laboratory, Department of Physiology, Monash Centre for Brain and Behaviour, Monash University, VIC, 3800, Australia, Pradeep.Nathan@med.monash.edu.au
Kristy Lu BSc (Hons), Brain Sciences Institute, Swinburne University of Technology, Melbourne, VIC, Australia
M. Gray BSc (Hons), Brain Sciences Institute, Swinburne University of Technology, Melbourne, VIC, Australia
C. Oliver BAgSc, School of Natural and Complementary Medicine, Southern Cross University, Lismore, NSW, Australia

Journal of Herbal Pharmacotherapy :
Innovations in Clinical and Applied Evidence-Based Herbal Medicinals
Volume: 6 Issue: 2
ISSN: 1522-8940 Pub Date: 11/20/2006
 

L-theanine (N-ethyl-L-glutamine) or theanine is a major amino acid uniquely found in green tea. L-theanine has been historically reported as a relaxing agent, prompting scientific research on its pharmacology. Animal neurochemistry studies suggest that L-theanine increases brain serotonin, dopamine, GABA levels and has micromolar affinities for AMPA, Kainate and NMDA receptors. In addition has been shown to exert neuroprotective effects in animal models possibly through its antagonistic effects on group 1 metabotrophic glutamate receptors. Behavioural studies in animals suggest improvement in learning and memory. Overall, L-theanine displays a neuropharmacology suggestive of a possible neuroprotective and cognitive enhancing agent and warrants further investigation in animals and humans.

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