It has been suggested that this article be merged into  Cyclic glycine-proline . (Discuss) Proposed since October 2024.  | 
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| Other names | Cycloprolylglycine; Cyclo-Gly-Pro; Cyclo-Pro-Gly; CGP; Cyclo-GP; Biocovax; Biomedivir; Dexaneurosone; NA-831; NA-81; Nanomedivir; Neurosivir; Traneurocine; (S)-Hexahydropyrrolo[1,2-a]pyrazine-1,4-dione | 
| Drug class | Neuroprotective; Neurogenesis stimulant; Cognitive enhancer | 
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| Elimination half-life | 7 hours [1] | 
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| Formula | C7H10N2O2 | 
| Molar mass | 154.169 g·mol−1 | 
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Traneurocin (developmental code name NA-831), also known as cycloprolylglycine (CPG), is a racetam-like drug which is under development for the treatment of COVID-19, Alzheimer's disease, fragile X syndrome, Rett syndrome, major depressive disorder, and other neurological disorders. [2] [3] [4] In the case of COVID-19, it is specifically being developed for treatment of COVID-19-induced neuropathy. [5]
The mechanism of action of traneurocin is either unknown or undisclosed. [6] [7] However, it has been described as acting as a positive allosteric modulator of the AMPA receptor and has been found to increase brain-derived neurotrophic factor (BDNF) levels. [2] [8] [4] [9] It has also been found to act as a positive allosteric modulator of the GABAA receptor. [10] The drug is described as having neuroprotective, neurogenesis-stimulating, and pro-cognitive or nootropic effects. [11] [12] [5] [1] [4] It has also been reported to have antihypoxic and anxiolytic properties. [13] [4]
It is known to be an endogenous compound present at micromolar concentrations in the rat brain and readily crosses the blood–brain barrier. [1] [4]
Chemically, traneurocin is a synthetic cyclized dipeptide composed of the amino acids glycine and proline. [3] [14] [15]
As of September 2024, traneurocin is in phase 3 clinical trials for COVID-19, phase 2 clinical trials for Alzheimer's disease, [16] fragile X syndrome, and Rett syndrome, and phase 1 clinical trials for major depressive disorder. [2] No development has been reported for treatment of other neurological disorders. [2] Traneurocin was first developed, under the name cycloprolylglycine (CPG), in Russia in 1991 as a drug related structurally and pharmacologically to piracetam. [13] [4] [17] Cycloprolylglycine is also related to and known to be the major metabolite of omberacetam (Noopept). [13]
Another drug, vineurocin (NA-704), is also being developed for treatment of Alzheimer's disease. [18] [19] This drug is described as a recombinant growth hormone with neuroprotective and neurogenic effects. [20]
2. Our second drug candidate, Vineurocin (NA-704) is a recombinant human growth hormone that modulates the aging process in humans. NA-704 exhibits neuroprotection and neurogenesis, which has been demonstrated as a strong candidate for treatment of Alzheimer's disease and other neurological disorders. The NA-704 Phase 2 will be from from June 2018 to May 2019.