Chemistry:Setmelanotide

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Short description: Chemical compound
Setmelanotide
Setmelanotide.svg
Clinical data
Trade namesImcivree
Other namesRM-493; BIM-22493; IRC-022493; N2-Acetyl-L-arginyl-L-cysteinyl-D-alanyl-L-histidyl-D-phenylalanyl-L-arginyl-L-tryptophyl-L-cysteinamide, cyclic (2-8)-disulfide
License data
Routes of
administration		Subcutaneous
ATC code
Legal status
Legal status
Identifiers
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
Chemical and physical data
FormulaC49H68N18O9S2
Molar mass1117.32 g·mol−1
3D model (JSmol)

Setmelanotide, sold under the brand name Imcivree, is a medication used for the treatment of genetic obesity caused by a rare single-gene mutation.[3][4][5]

The most common side effects include injection site reactions, skin hyperpigmentation (skin patches that are darker than surrounding skin), headache and gastrointestinal side effects (such as nausea, diarrhea, and abdominal pain), among others.[4] Spontaneous penile erections in males and adverse sexual reactions in females have occurred with treatment.[4] Depression and suicidal ideation have also occurred with setmelanotide.[4]

Setmelanotide was approved for medical use in the United States in November 2020,[6][7] and in the European Union in July 2021.[5] The U.S. Food and Drug Administration (FDA) considers it to be a first-in-class medication.[8][7]

Medical uses

Setmelanotide is indicated for chronic weight management (weight loss and weight maintenance for at least one year) in people six years and older with obesity due to three rare genetic conditions: pro-opiomelanocortin (POMC) deficiency, proprotein subtilisin/kexin type 1 (PCSK1) deficiency, and leptin receptor (LEPR) deficiency confirmed by genetic testing demonstrating variants in POMC, PCSK1, or LEPR genes considered pathogenic (causing disease), likely pathogenic, or of uncertain significance.[3][4][5] Setmelanotide is the first FDA-approved treatment for these genetic conditions.[4]

Setmelanotide is not approved for obesity due to suspected POMC, PCSK1, or LEPR deficiency with variants classified as benign (not causing disease) or likely benign or other types of obesity, including obesity associated with other genetic syndromes and general (polygenic) obesity.[4]

Pharmacology

Setmelanotide binds to and activates MC4 receptors in the paraventricular nucleus (PVN) of the hypothalamus and in the lateral hypothalamic area (LHA), areas involved in the regulation of appetite, and this action is thought to underlie its appetite suppressant effects.[9] In addition to reducing appetite, setmelanotide increases resting energy expenditure in both obese animals and humans.[10] Importantly, unlike certain other MC4 receptor agonists, such as LY-2112688, setmelanotide has not been found to produce increases in heart rate or blood pressure.[11]

Setmelanotide has been reported to possess the following activity profile (cAMP, EC50): MC4 (0.27 nM) > MC3 (5.3 nM) ≈ MC1 (5.8 nM) > MC5 (1600 nM) ≟ MC2 (>1000 nM).[12] (19.6-fold selectivity for MC4 over MC3, the second target of highest activity.)

History

Setmelanotide was invented at Ipsen.[13] It was initially known as BIM-22493 and then as RM-493 and IRC-022493.

It was evaluated in two one-year clinical studies.[4] The first study enrolled 10 participants with obesity and confirmed or suspected POMC or PCSK1 deficiency while the second study enrolled 11 participants with obesity and confirmed or suspected LEPR deficiency; all participants were six years or older.[4] Most participants had lost more than 10% of their initial body weight after a year of treatment.[4] Some participants also reported feeling less hungry.[4]

The U.S. Food and Drug Administration (FDA) granted the application for setmelanotide orphan disease designation, breakthrough therapy designation, and priority review.[4] The FDA granted the approval of Imcivree to Rhythm Pharmaceutical, Inc.[4][6]

Society and culture

Economics

In 2021, the cost was $330 for 1 mg.[14]

Legal status

Setmelanotide was approved for medical use in the United States in November 2020.[6][7]

Setmelanotide was approved for medical use in the European Union in July 2021.[5][15]

Research

Setmelanotide is a peptide drug and investigational anti-obesity medication which acts as a selective agonist of the MC4 receptor;[16][11] the structure of the bound complex has recently been determined.[17] Its peptide sequence is Ac-Arg-Cys(1)-D-Ala-His-D-Phe-Arg-Trp-Cys(1)-NH2. It was first discovered at Ipsen and is being developed by Rhythm Pharmaceuticals for the treatment of obesity and diabetes.[16] In addition, Rhythm Pharmaceuticals is conducting trials of setmelanotide for the treatment of Prader–Willi syndrome (PWS), a genetic disorder which includes MC4 receptor deficiency and associated symptoms such as excessive appetite and obesity.[18] As of December 2014, the drug is in phase II clinical trials for obesity and PWS.[16][19][20][needs update] So far, preliminary data has shown no benefit of Setmelanotide in Prader-Willi syndrome.[21]

The drug has some efficacy in obese people who lack the genetic variants that the drug is approved for, but its safety and efficacy in this wider population is not well understood.[14]

References

  1. ↑ "Summary Basis of Decision for Imcivree". 7 July 2023. https://dhpp.hpfb-dgpsa.ca/review-documents/resource/SBD1688741986480. 
  2. ↑ "Details for: Imcivree". 12 July 2023. https://dhpp.hpfb-dgpsa.ca/dhpp/resource/102647. 
  3. ↑ 3.0 3.1 3.2 "Imcivree- setmelanotide solution". https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=70c3ccf7-4df0-4c75-ba07-fede9970c8d9. 
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 4.12 4.13 "FDA approves first treatment for weight management for people with certain rare genetic conditions". U.S. Food and Drug Administration (FDA) (Press release). 27 November 2020. Retrieved 27 November 2020. This article incorporates text from this source, which is in the public domain.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 "Imcivree EPAR". 19 May 2021. https://www.ema.europa.eu/en/medicines/human/EPAR/imcivree.  Text was copied from this source which is © European Medicines Agency. Reproduction is authorized provided the source is acknowledged.
  6. ↑ 6.0 6.1 6.2 "Drug Approval Package: Imcivree". 23 December 2020. https://www.accessdata.fda.gov/drugsatfda_docs/nda/2020/213793Orig1s000TOC.cfm. 
  7. ↑ 7.0 7.1 7.2 "FDA approves first treatment for weight management". 30 September 2021. https://www.fda.gov/drugs/news-events-human-drugs/fda-approves-first-treatment-weight-management-people-certain-rare-genetic-conditions. 
  8. ↑ "New Drug Therapy Approvals 2020". 31 December 2020. https://www.fda.gov/drugs/new-drugs-fda-cders-new-molecular-entities-and-new-therapeutic-biological-products/new-drug-therapy-approvals-2020. 
  9. ↑ "Antiobesity pharmacotherapy: new drugs and emerging targets". Clinical Pharmacology and Therapeutics 95 (1): 53–66. January 2014. doi:10.1038/clpt.2013.204. PMID 24105257. 
  10. ↑ "RM-493, a melanocortin-4 receptor (MC4R) agonist, increases resting energy expenditure in obese individuals". The Journal of Clinical Endocrinology and Metabolism 100 (4): 1639–45. April 2015. doi:10.1210/jc.2014-4024. PMID 25675384. 
  11. ↑ 11.0 11.1 "Chronic treatment with a melanocortin-4 receptor agonist causes weight loss, reduces insulin resistance, and improves cardiovascular function in diet-induced obese rhesus macaques". Diabetes 62 (2): 490–497. February 2013. doi:10.2337/db12-0598. PMID 23048186. 
  12. ↑ "A Randomized, Double-Blind, Placebo-Controlled, Crossover Study to Evaluate the Effect of a Melanocortin Receptor 4 (MC4R) Agonist, RM-493, on Resting Energy Expenditure (REE) in Obese Subjects". Endocrine Reviews (Rhythm Pharmaceuticals) 35 (3). June 2014. http://www.rhythmtx.com/pdfs/ICE-ENDO%202014%20Rhythm%20RM-493%20REE.pdf. Retrieved 21 May 2015. 
  13. ↑ US Patent US 8,039,435 B2, "Melanocortin Receptor Ligands", 18 October 2011, Inventors: Zheng Xin Dong, Jacques-Pierre Moreau
  14. ↑ 14.0 14.1 "Next Generation Antiobesity Medications: Setmelanotide, Semaglutide, Tirzepatide and Bimagrumab: What do They Mean for Clinical Practice?". Journal of Obesity & Metabolic Syndrome 30 (3): 196–208. September 2021. doi:10.7570/jomes21033. PMID 34518444. 
  15. ↑ "Imcivree Product information". https://ec.europa.eu/health/documents/community-register/html/h1564.htm. 
  16. ↑ 16.0 16.1 16.2 "Melanocortin-4 receptor modulators for the treatment of obesity: a patent analysis (2008-2014)". Pharmaceutical Patent Analyst 4 (2): 95–107. 2015. doi:10.4155/ppa.15.1. PMID 25853469. 
  17. ↑ "Structure reveals the activation mechanism of the MC4 receptor to initiate satiation signaling". Science 372 (6544): 808–814. May 2021. doi:10.1126/science.abf7958. PMID 33858992. Bibcode: 2021Sci...372..808I. https://qmro.qmul.ac.uk/xmlui/handle/123456789/71518. 
  18. ↑ "Obesity and Diabetes Caused by Genetic Deficiencies in the MC4 Pathway". Rhythm Pharmaceuticals. http://www.rhythmtx.com/PROGRAMS/obesitydiabetes.html. 
  19. ↑ "Investigational drugs in Phase II clinical trials for the treatment of obesity: implications for future development of novel therapies". Expert Opinion on Investigational Drugs 23 (8): 1055–1066. August 2014. doi:10.1517/13543784.2014.918952. PMID 25000213. 
  20. ↑ "RM-493: A First-in-Class, Phase 2-Ready MC4 Agonist: A New Drug Class for the Treatment of Obesity and Diabetes". Rhythm Pharmaceuticals. http://www.rhythmtx.com/PROGRAMS/RM493.html. 
  21. ↑ "A multidisciplinary approach to the clinical management of Prader-Willi syndrome". Molecular Genetics & Genomic Medicine 7 (3): e514. March 2019. doi:10.1002/mgg3.514. PMID 30697974. 

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