Gly-Pro-Glu (GPE) is a neuroactive peptide. It prevents the binding of glutamate to N-methyl-D-aspartate (NMDA) receptor. It positively regulates the potassium-mediated release of acetylcholine and is thus involved in the control of brain function. It improves signalling to muscles and muscle activation.  Gly-Pro-Glu is neuroprotective after central administration in animal models of neurodegenerative processes, such as Huntington’s, Parkinson’s, Alzheimer’s diseases, and various acute brain injury animal models. The neuroprotective activity is not related to its affinity to glutamate receptor. Findings indicate that GPE mimics insulin-like growth factor I effects on the somatostatin system.

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