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GTS-21

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GTS-21
Clinical data
Other names3-(2,4-dimethoxy-benzylidene)anabaseine
Identifiers
  • (3E)-3-(2,4-Dimethoxybenzylidene)-3,4,5,6-tetrahydro-2,3'-bipyridine
CAS Number
PubChemCID
ChemSpider
UNII
CompTox Dashboard(EPA)
Chemical and physical data
FormulaC19H20N2O2
Molar mass308.381g·mol−1
3D model (JSmol)
  • COc2cc(OC)ccc2C=C1CCCN=C1c3cnccc3
  • InChI=1S/C19H20N2O2/c1-22-17-8-7-14(18(12-17)23-2)11-15-5-4-10-21-19(15)16-6-3-9-20-13-16/h3,6-9,11-13H,4-5,10H2,1-2H3/b15-11+
  • Key:RPYWXZCFYPVCNQ-RVDMUPIBSA-N
(verify)

GTS-21(DMXBAorDMBX-anabaseine) is a drug that has been shown to enhance memory and cognitive function. It has been studied for its potential therapeutic uses, particularly in the treatment of neurodegenerative diseases and psychiatric disorders.

It is a derivative of thenatural productanabaseinethat acts as apartial agonistat neuralnicotinic acetylcholine receptors(nAChRs). It binds to both theα4β2andα7subtypes,but activates only the α7 to any significant extent.[1][2]Activation of the α7 nAChR has been shown to have neuroprotective effects and to improve cognitive function, making it an attractive target for drug development.

Both GTS-21 itself and its demethylated active metabolite 4-OH-GTS-21[3]displaynootropic[4]andneuroprotectiveeffects,[5][6][7][8]and GTS-21 is being investigated for the treatment ofAlzheimer's disease,[9][10]nicotine dependence,[11]and, most significantly, forschizophrenia.[12][13][14][15][16]

Animal studies

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Several studies have investigated the effects of GTS-21 in various animal models of neurodegenerative diseases, including Alzheimer's disease, Parkinson's disease, and multiple sclerosis. In these studies, GTS-21 has been shown to have anti-inflammatory and neuroprotective effects, and to improve cognitive function.

A recent study investigated the cholinergic anti-inflammatory pathway (CAP) in rheumatoid arthritis (RA). They used the α7 nicotinic acetylcholine receptor (α7nAChR) agonist GTS-21 to study its role in reducing synovial inflammation in a mice model of collagen-induced arthritis (CIA). GTS-21 lessened inflammation and reduced monocyte infiltration into the synovium. This study highlights a new mechanism by which cholinergic signaling can mitigate synovial inflammation in RA.[17]

Clinical trials

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Phase one of a clinical trial using DXMBA as a potential treatment for schizophrenia was completed in January of 2005. 12 non-smoking subjects diagnosed with schizophrenia each received 3 daily treatments. The treatments consisted of 150mg of DMXBA, with another dose of 75mg administered 2 hours later, 75mg of DXMBA, with another dose of 37.5mg administered 2 hours later, and a placebo treatment. The order of the doses was randomized over the 3-day course of the treatments. A P50 auditory-evoked test measured a significant effect on sensory gating, and a Repeatable Battery for Assessment of Neuropsychological Status test measured a significant effect on neurocognition. The subjects did not report any symptoms or side effects, however the leukocyte count of one subject decreased from slightly above normal on the placebo, to slightly below normal when administered the higher dose of DXMBA. After receiving no exposure to the drug, the subject's leukocyte count returned to normal 2 days later.[18]This clinical trial untimely was discontinued during phase II.[18]Several other trials focusing on a range of health issues including Alzheimer's, schizophrenia, autism, ADHD, and nicotine use were either discontinued or withdrawn.[19][20][21][22][23]

Another study of GTS-21 in healthy volunteers found that the drug improved attention and memory performance.[4]

Overall, the available evidence suggests that GTS-21 has potential as a therapeutic agent for neurodegenerative diseases and psychiatric disorders. However, more research is needed to fully understand its safety and efficacy, and to determine the optimal dosing and administration regimens.

History

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The laboratory nameGTS-21means that it is the 21st chemical compound created byGainesville (University of FloridainGainesville) andTokushima (Taiho Pharmaceutical)Scientists.[24]DMXBA– 3-2,4-dimethoxybenzylideneanabaseine.

References

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  1. ^Briggs CA, Anderson DJ, Brioni JD, Buccafusco JJ, Buckley MJ, Campbell JE, et al. (1997). "Functional characterization of the novel neuronal nicotinic acetylcholine receptor ligand GTS-21 in vitro and in vivo".Pharmacology, Biochemistry, and Behavior.57(1–2): 231–241.doi:10.1016/S0091-3057(96)00354-1.PMID9164577.S2CID205923953.
  2. ^Meyer EM, Tay ET, Papke RL, Meyers C, Huang GL, de Fiebre CM (September 1997). "3-[2,4-Dimethoxybenzylidene]anabaseine (DMXB) selectively activates rat alpha7 receptors and improves memory-related behaviors in a mecamylamine-sensitive manner".Brain Research.768(1–2): 49–56.doi:10.1016/S0006-8993(97)00536-2.PMID9369300.S2CID13104716.
  3. ^Meyer EM, Kuryatov A, Gerzanich V, Lindstrom J, Papke RL (December 1998). "Analysis of 3-(4-hydroxy, 2-Methoxybenzylidene)anabaseine selectivity and activity at human and rat alpha-7 nicotinic receptors".The Journal of Pharmacology and Experimental Therapeutics.287(3): 918–925.PMID9864273.
  4. ^abKitagawa H, Takenouchi T, Azuma R, Wesnes KA, Kramer WG, Clody DE, Burnett AL (March 2003)."Safety, pharmacokinetics, and effects on cognitive function of multiple doses of GTS-21 in healthy, male volunteers".Neuropsychopharmacology.28(3): 542–551.doi:10.1038/sj.npp.1300028.PMID12629535.
  5. ^Meyer EM, King MA, Meyers C (March 1998). "Neuroprotective effects of 2,4-dimethoxybenzylidene anabaseine (DMXB) and tetrahydroaminoacridine (THA) in neocortices of nucleus basalis lesioned rats".Brain Research.786(1–2): 252–254.doi:10.1016/s0006-8993(97)00300-4.PMID9555043.S2CID325503.
  6. ^Shimohama S, Greenwald DL, Shafron DH, Akaika A, Maeda T, Kaneko S, et al. (January 1998). "Nicotinic alpha 7 receptors protect against glutamate neurotoxicity and neuronal ischemic damage".Brain Research.779(1–2): 359–363.doi:10.1016/s0006-8993(97)00194-7.PMID9473725.S2CID54342132.
  7. ^Li Y, Meyer EM, Walker DW, Millard WJ, He YJ, King MA (May 2002)."Alpha7 nicotinic receptor activation inhibits ethanol-induced mitochondrial dysfunction, cytochrome c release and neurotoxicity in primary rat hippocampal neuronal cultures".Journal of Neurochemistry.81(4): 853–858.doi:10.1046/j.1471-4159.2002.00891.x.PMID12065644.S2CID41950110.
  8. ^de Fiebre NC, de Fiebre CM (November 2003). "Alpha 7 nicotinic acetylcholine receptor-mediated protection against ethanol-induced neurotoxicity".Alcohol.31(3): 149–153.doi:10.1016/j.alcohol.2003.08.006.PMID14693263.
  9. ^Azuma R, Komuro M, Korsch BH, Andre JC, Onnagawa O, Black SR, Mathews JM (July 1999). "Metabolism and disposition of GTS-21, a novel drug for Alzheimer's disease".Xenobiotica; the Fate of Foreign Compounds in Biological Systems.29(7): 747–762.doi:10.1080/004982599238362.PMID10456692.
  10. ^Kem WR (August 2000). "The brain alpha7 nicotinic receptor may be an important therapeutic target for the treatment of Alzheimer's disease: studies with DMXBA (GTS-21)".Behavioural Brain Research.113(1–2): 169–181.doi:10.1016/s0166-4328(00)00211-4.PMID10942043.S2CID39523754.
  11. ^Foulds J, Burke M, Steinberg M, Williams JM, Ziedonis DM (May 2004). "Advances in pharmacotherapy for tobacco dependence".Expert Opinion on Emerging Drugs.9(1): 39–53.doi:10.1517/14728214.9.1.39.PMID15155135.S2CID219187104.
  12. ^Simosky JK, Stevens KE, Freedman R (April 2002). "Nicotinic agonists and psychosis".Current Drug Targets. CNS and Neurological Disorders.1(2): 149–162.doi:10.2174/1568007024606168.PMID12769624.
  13. ^Martin LF, Kem WR, Freedman R (June 2004). "Alpha-7 nicotinic receptor agonists: potential new candidates for the treatment of schizophrenia".Psychopharmacology.174(1): 54–64.doi:10.1007/s00213-003-1750-1.PMID15205879.S2CID21557412.
  14. ^Olincy A, Harris JG, Johnson LL, Pender V, Kongs S, Allensworth D, et al. (June 2006). "Proof-of-concept trial of an alpha7 nicotinic agonist in schizophrenia".Archives of General Psychiatry.63(6): 630–638.doi:10.1001/archpsyc.63.6.630.PMID16754836.
  15. ^Olincy A, Stevens KE (October 2007)."Treating schizophrenia symptoms with an alpha7 nicotinic agonist, from mice to men".Biochemical Pharmacology.74(8): 1192–1201.doi:10.1016/j.bcp.2007.07.015.PMC2134979.PMID17714692.
  16. ^Freedman R, Olincy A, Buchanan RW, Harris JG, Gold JM, Johnson L, et al. (August 2008)."Initial phase 2 trial of a nicotinic agonist in schizophrenia".The American Journal of Psychiatry.165(8): 1040–1047.doi:10.1176/appi.ajp.2008.07071135.PMC3746983.PMID18381905.
  17. ^Bai X, Zhou B, Wu S, Zhang X, Zuo X, Li T (September 2023)."GTS-21 alleviates murine collagen-induced arthritis through inhibition of peripheral monocyte trafficking into the synovium".International Immunopharmacology.122:110676.doi:10.1016/j.intimp.2023.110676.PMID37481853.
  18. ^abClinical trial numberNCT00100165for "Phase 2 Trial of the Nicotinic Agonist 3-(2,4 Dimethoxybenzylidene Anabaseine) in Schizophrenia" atClinicalTrials.gov
  19. ^Clinical trial numberNCT00414622for "GTS21-201 for Alzheimer Disease:GTS-21 Administered Daily for 28 Days to Participants With Probable Alzheimer's Disease" atClinicalTrials.gov
  20. ^Clinical trial numberNCT01400477for "Nicotinic Receptors and Schizophrenia" atClinicalTrials.gov
  21. ^Clinical trial numberNCT02111551for "Phase I Nicotinic Agonist Treatment Trial for Autism" atClinicalTrials.gov
  22. ^Clinical trial numberNCT00419445for "Safety and Efficacy of GTS21 in Adults With Attention-deficit Hyperactivity Disorder" atClinicalTrials.gov
  23. ^Clinical trial numberNCT02432066for "Effects of GTS-21 on Smoking Behavior and Neurocognitive Functions" atClinicalTrials.gov
  24. ^Yokoyama T, Ishikawa T, Ban K, Saitoh H (September 1987). "[Thirteen-year-old girl presenting chorea after treatment of hyperthyroidism]".No to Hattatsu = Brain and Development.19(5): 408–414.PMID3663414.

Further reading

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  • Levin ED, McClernon FJ, Rezvani AH. "Effects of oral nicotine and GTS-21 (DMXB-A) on working memory in smokers".Psychopharmacology.194(2): 173–181.
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