Ganaxolone
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Trade names | Ztalmy |
Other names | GNX; CCD-1042; 3β-Methyl-5α-pregnan-3α-ol-20-one; 3α-Hydroxy-3β-methyl-5α-pregnan-20-one |
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Routes of administration | By mouth |
Drug class | Neurosteroid |
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CompTox Dashboard(EPA) | |
ECHA InfoCard | 100.210.937 |
Chemical and physical data | |
Formula | C22H36O2 |
Molar mass | 332.528g·mol−1 |
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Ganaxolone,sold under the brand nameZtalmy,is amedicationused to treatseizuresin people withcyclin-dependent kinase-like 5 (CDKL5) deficiency disorder.[1][3]Ganaxolone is a neuroactive steroidgamma-aminobutyric acid (GABA) A receptor positive modulator.[1]
The most common side effects of treatment with ganaxolone includesomnolence(sleepiness), fever, excessive saliva or drooling, and seasonal allergy.[4]
Ganaxolone was approved for medical use in the United States in March 2022,[1][4][5]and in the European Union in July 2023.[2]The USFood and Drug Administration(FDA) considers it to be afirst-in-class medication.[6][7]
Medical uses
[edit]Ganaxolone is indicated for the treatment of seizures associated with cyclin-dependent kinase-like 5 (CDKL5) deficiency disorder.[1][2][8][9]
Pharmacology
[edit]Mechanism of action
[edit]The exact mechanism of action for ganaxolone is unknown; however, results from animal studies suggest that it acts by blocking seizure propagation and elevating seizure thresholds.[10][11]
Ganaxolone is thought to modulate bothsynapticand extrasynapticGABAAreceptorsto normalize over-excitedneurons.[3]Ganaxolone's activation of the extrasynaptic receptor is an additional mechanism that provides stabilizing effects that potentially differentiates it from other drugs that increaseGABAsignaling.[3]
Ganaxolone binds toallostericsites of the GABAAreceptor to modulate and open thechloride ion channel,resulting in ahyperpolarizationof the neuron.[3]This causes an inhibitory effect onneurotransmission,reducing the chance of a successfulaction potential(depolarization) from occurring.[3][10][11]
It is unknown whether ganaxolone possesses significant hormonal activityin vivo,with a 2020 study finding evidence ofin vitrobinding to the membraneprogesterone receptor.[12]
Chemistry
[edit]Ganaxolone is ananalogof theneurosteroidallopregnanolonethat possesses no known hormonal activity and, instead, is thought to primarily function by binding to GABAAreceptors as apositive allosteric modulator.[13]
Other pregnane neurosteroids includealfadolone,alfaxolone,hydroxydione,minaxolone,pregnanolone(eltanolone), andrenanolone,among others.[14]
History
[edit]The FDA approved ganaxolone based on evidence from a single, double-blind, randomized, placebo-controlled study (Study 1, NCT03572933) of 101 participants with cyclin-dependent kinase-like 5 (CDKL5) deficiency disorder who were two years of age and older.[4]The trial was conducted at 36 sites in 8 countries including Australia, France, Israel, Italy, Poland, Russian Federation, the United Kingdom, and the United States.[4]Forty-four (40.7%) of the participants were from US sites.[4]Safety was assessed from a pool of two clinical studies.[4]These include the study of participants with cyclin-dependent kinase-like 5 deficiency disorder and a clinical study that included seven additional participants from a trial of ganaxolone in children and young adults.[4]
References
[edit]- ^abcde"Ztalmy- ganaxolone suspension".DailyMed.15 November 2022.Archivedfrom the original on 21 January 2023.Retrieved21 January2023.
- ^abc"Ztalmy EPAR".European Medicines Agency.31 July 2023.Archivedfrom the original on 25 August 2023.Retrieved25 August2023.
- ^abcdeCarter RB, Wood PL, Wieland S, Hawkinson JE, Belelli D, Lambert JJ, et al. (March 1997). "Characterization of the anticonvulsant properties of ganaxolone (CCD 1042; 3alpha-hydroxy-3beta-methyl-5alpha-pregnan-20-one), a selective, high-affinity, steroid modulator of the gamma-aminobutyric acid(A) receptor".The Journal of Pharmacology and Experimental Therapeutics.280(3): 1284–1295.PMID9067315.
- ^abcdefg"Drug Trials Snapshots: Ztalmy".U.S. Food and Drug Administration.18 March 2022.Retrieved9 October2023.This article incorporates text from this source, which is in thepublic domain.
- ^Lamb YN (June 2022). "Ganaxolone: First Approval".Drugs.82(8): 933–940.doi:10.1007/s40265-022-01724-0.PMID35596878.
- ^"Advancing Health Through Innovation: New Drug Therapy Approvals 2022".U.S.Food and Drug Administration(FDA).10 January 2023.Archivedfrom the original on 21 January 2023.Retrieved22 January2023.This article incorporates text from this source, which is in thepublic domain.
- ^New Drug Therapy Approvals 2022(PDF).U.S.Food and Drug Administration(FDA)(Report). January 2024.Archivedfrom the original on 14 January 2024.Retrieved14 January2024.This article incorporates text from this source, which is in thepublic domain.
- ^Gould A, Amin S (July 2024). "An overview of ganaxolone as a treatment for seizures associated with cyclin-dependent kinase-like 5 deficiency disorder".Expert Review of Neurotherapeutics:1–7.doi:10.1080/14737175.2024.2385937.PMID39082513.
- ^Khan P, Saini S, Hussain S, Majid H, Gupta S, Agarwal N (April 2024). "A systematic review and meta-analysis on efficacy and safety of Ganaxolone in epilepsy".Expert Opinion on Pharmacotherapy.25(5): 621–632.doi:10.1080/14656566.2024.2342413.PMID38606458.
- ^abKaminski RM, Livingood MR, Rogawski MA (July 2004). "Allopregnanolone analogs that positively modulate GABA receptors protect against partial seizures induced by 6-Hz electrical stimulation in mice".Epilepsia.45(7): 864–867.doi:10.1111/j.0013-9580.2004.04504.x.PMID15230714.S2CID21974013.
- ^abReddy DS, Rogawski MA (May 2010)."Ganaxolone suppression of behavioral and electrographic seizures in the mouse amygdala kindling model".Epilepsy Research.89(2–3): 254–260.doi:10.1016/j.eplepsyres.2010.01.009.PMC2854307.PMID20172694.
- ^Thomas P, Pang Y (24 June 2020)."Anti-apoptotic Actions of Allopregnanolone and Ganaxolone Mediated Through Membrane Progesterone Receptors (PAQRs) in Neuronal Cells".Frontiers in Endocrinology.11(417): 417.doi:10.3389/fendo.2020.00417.PMC7331777.PMID32670200.
- ^"Ganaxolone".PubChem.U.S. National Center for Biotechnology Information (NCBI), National Library of Medicine (NLM).Archivedfrom the original on 10 December 2022.Retrieved6 August2022.
- ^US 20190160078A1,Masuoka LK, Lappalainen J, "Ganaxolone for use in treating genetic epileptic disorders", issued 2019-05-30, assigned to Marinus Pharmaceuticals Inc.
External links
[edit]- Clinical trial numberNCT03572933for "Study of Adjunctive Ganaxolone Treatment in Children and Young Adults With CDKL5 Deficiency Disorder (Marigold)" atClinicalTrials.gov