Exenatide Explained

Verifiedfields:changed
Watchedfields:changed
Verifiedrevid:443485715
Tradename:Byetta, Bydureon, Bydureon BCise, others
Dailymedid:Exenatide
Pregnancy Au:C
Routes Of Administration:Subcutaneous
Atc Prefix:A10
Atc Suffix:BJ01
Legal Au:S4
Legal Uk:POM
Legal Us:Rx-only
Legal Us Comment:[1] [2] [3]
Legal Eu:Rx-only
Legal Status:Rx-only
Bioavailability:N/A
Metabolism:proteolysis
Elimination Half-Life:2.4 h
Excretion:Kidney
Cas Number:141758-74-9
Pubchem:16157882
Iuphar Ligand:1135
Drugbank:DB01276
Chemspiderid:17314184
Unii:9P1872D4OL
Kegg:D04121
C:184
H:282
N:50
O:60
S:1
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Exenatide, sold under the brand name Byetta among others, is a medication used to treat type 2 diabetes.[4] It is used together with diet, exercise, and potentially other antidiabetic medication.[4] It is a treatment option after metformin and sulfonylureas.[5] It is given by injection under the skin.[4]

Common side effects include low blood sugar, nausea, dizziness, abdominal pain, and pain at the site of injection.[4] Other serious side effects may include medullary thyroid cancer, angioedema, pancreatitis, and kidney injury.[4] Use in pregnancy and breastfeeding is of unclear safety.[6] Exenatide is a glucagon-like peptide-1 receptor agonist (GLP-1 receptor agonist) also known as incretin mimetics.[4] It works by increasing insulin release from the pancreas and decreases excessive glucagon release.[4]

Exenatide was approved for medical use in the United States in 2005.[4] In 2019, it was the 312th most commonly prescribed medication in the United States, with more than 1million prescriptions.[7]

Medical use

Exenatide is used to treat type 2 diabetes as an add-on to metformin, a biguanide, or a combination of metformin and a sulfonylurea, or thiazolidinediones such as pioglitazone.[8] [9]

A 2011 Cochrane review showed a HbA1c reduction of 0.20% more with Exenatide 2 mg compared to insulin glargine, exenatide 10 μg twice daily, sitagliptin and pioglitazone.[10] Exenatide, lead to greater weight loss than glucagon-like peptide analogues. Due to shorter duration of studies, this review did not allow for long-term positive or negative effects to be assessed.

Side effects

The main side effects of exenatide use are gastrointestinal in nature, including acid or sour stomach, belching, diarrhea, heartburn, indigestion, nausea, and vomiting. These tend to subside with time; exenatide is therefore not meant for people with severe gastrointestinal disease. Other side effects include dizziness, headache, and feeling jittery.[11] Drug interactions listed on the package insert include delayed or reduced concentrations of lovastatin, paracetamol (acetaminophen), and digoxin, although this has not been proven to alter the effectiveness of these other medications. In response to postmarketing reports of acute pancreatitis in patients using exenatide, the US Food and Drug Administration (FDA) added a boxed warning to the labeling of Byetta in 2007.[12] [13] In August 2008, four additional deaths from pancreatitis in users of exenatide were reported to the FDA; while no definite relationship had been established, the FDA was reportedly considering additional changes to the drug's labeling.[14] Examination of the medical records of the millions of patients part of the United Healthcare Insurance plans did not show any greater rate of pancreatitis among Byetta users than among diabetic patients on other medications. However, diabetics do have a slightly greater incidence of pancreatitis than do non-diabetics.[15] [16]

It also may increase risk of mild sulfonylurea-induced hypoglycemia.[17]

Additionally, the FDA has raised concerns over the lack of data to determine if the long-acting once-weekly version of exenatide (but not the twice-daily form of exenatide) may increase thyroid cancer risk. This concern comes out of observing a very small but nevertheless increased risk of thyroid cancer in rodents that was observed for another drug (liraglutide) that is in the same class as exenatide. The data available for exenatide showed less of a risk towards thyroid cancer than liraglutide, but to better quantify the risk the FDA has required Amylin to conduct additional rodent studies to better identify the thyroid issue. The approved form of the once weekly exenatide [Bydureon] has a black box warning discussing the thyroid issue. Eli Lilly has reported they have not seen a link in humans, but that it cannot be ruled out. Eli Lilly has stated the drug causes an increase in thyroid problems in rats given high doses.[18]

In March 2013, the FDA issued a Drug Safety Communication announcing investigations into incretin mimetics due to findings by academic researchers.[19] A few weeks later, the European Medicines Agency launched a similar investigation into GLP-1 agonists and DPP-4 inhibitors.[20]

Mechanism of action

Exenatide binds to the intact human Glucagon-like peptide-1 receptor (GLP-1R) in a similar way to the human peptide glucagon-like peptide-1 (GLP-1); exenatide bears a 50% amino acid homology to GLP-1 and it has a longer half-life in vivo.[21]

Exenatide is believed to facilitate glucose control in at least five ways:

  1. Exenatide augments pancreas response[22] (i.e. increases insulin secretion) in response to eating meals; the result is the release of a higher, more appropriate amount of insulin that helps lower the rise in blood sugar from eating. Once blood sugar levels decrease closer to normal values, the pancreas response to produce insulin is reduced; other drugs (like injectable insulin) are effective at lowering blood sugar, but can "overshoot" their target and cause blood sugar to become too low, resulting in the dangerous condition of hypoglycemia.
  2. Exenatide also suppresses pancreatic release of glucagon in response to eating, which helps stop the liver from overproducing sugar when it is unneeded, which prevents hyperglycemia (high blood sugar levels).
  3. Exenatide helps slow down gastric emptying and thus decreases the rate at which meal-derived glucose appears in the bloodstream.
  4. Exenatide has a subtle yet prolonged effect to reduce appetite, promote satiety via hypothalamic receptors (different receptors than for amylin). Most people using exenatide slowly lose weight, and generally the greatest weight loss is achieved by people who are the most overweight at the beginning of exenatide therapy. Clinical trials have demonstrated the weight reducing effect continues at the same rate through 2.25 years of continued use. When separated into weight loss quartiles, the highest 25% experience substantial weight loss, and the lowest 25% experience no loss or small weight gain.
  5. Exenatide reduces liver fat content. Fat accumulation in the liver or nonalcoholic fatty liver disease (NAFLD) is strongly related with several metabolic disorders, in particular low HDL cholesterol and high triglycerides, present in patients with type 2 diabetes. It became apparent that exenatide reduced liver fat in mice,[23] rat[24] and more recently in man.[25]

Chemistry

Exenatide is a 39-amino-acid peptide; it is a synthetic version of exendin-4, a peptide found in the venom of the Gila monster.[26]

History

During the early 1980s, Jean-Pierre Raufman worked as a postdoctoral researcher at the National Institutes of Health for John Pisano, an "eccentric biochemist" who specialized in collecting venoms from various animals and looking for novel substances that could affect human physiology.[27] In the course of this work, Raufman focused on investigating the Gila monster because he was curious about how it only eats once or twice per year.[28] He discovered molecules in the monster's saliva "that caused inflammation of the pancreas in test animals". He later recalled: "We got a tremendous response from Gila monster venom".[29]

When Raufman gave a lecture about his findings, his research piqued the curiosity of John Eng, an endocrinologist at the Veterans Administration Medical Center in New York City. Eng had trained under Rosalyn Sussman Yalow, who shared the 1977 Nobel Prize in Physiology or Medicine for development of the radioimmunoassay technique.

In 1992, Eng used that technique to isolate a novel substance from Gila monster venom which he called exendin-4. He tested exendin-4 on diabetic mice and discovered that it was not only effective for reducing blood glucose but was effective for several hours. This was an enormously significant clinical finding, because it was GLP-1's extremely short half-life which had defeated earlier attempts to turn that substance into a drug. Attempts to bypass that issue by infusing patients in clinical tests with very high doses of GLP-1—in order to overcome its rapid metabolism in the bloodstream—had produced extremely severe nausea, followed by immediate vomiting.

Eng's employer, the U.S. Department of Veterans Affairs, turned out to have no interest in obtaining a drug patent on exendin-4, so Eng filed the patent application himself in 1993. He then spent three years on fruitless efforts to persuade the pharmaceutical industry to develop exendin-4 into a drug. Jens Juul Holst, a GLP-1 expert, later recalled seeing the skepticism which Eng encountered when he tried to present his work on a poster at industry conferences: "He was extremely frustrated ... Nobody was interested in his work. None of the important people. It was too strange for people to accept".

At a 1996 American Diabetes Association conference in San Francisco, Eng finally caught the attention of scientist Andrew Young of Amylin Pharmaceuticals, who immediately recognized exendin-4's potential and arranged for his company to license Eng's patent.[30] Young was excited to see Eng's poster at the conference summarizing his findings, but then noticed an Eli Lilly and Company executive reading the same poster, and he became worried that Lilly might beat Amylin to a license. When Eng arrived at Amylin's San Diego headquarters, he was astonished to discover how much information Amylin's scientists had already figured out about exendin-4 in the brief period of time after Young saw his poster, which convinced him that Amylin was the right company to partner with. Amylin went on to create exenatide, a synthetic version of exendin-4, and later formed an alliance with Lilly in 2002 to bring the drug to market.[31]

Exenatide was approved by the FDA in April 2005, for people whose diabetes is not well controlled on other oral medications.[32] [33] [34] This was a landmark event which proved that targeting the GLP-1 receptor was a viable strategy and inspired other pharmaceutical companies to focus their research and development on that receptor.

In 2011, Lilly and Amylin dissolved their partnership, with Amylin keeping the rights to exenatide.[35] Meanwhile, Lilly had been awakened to the possibilities of this class of drugs and continued to develop newer drugs of the same class. By October 2024, the blockbuster drug tirzepatide had transformed Lilly into the most valuable drug company in the world.[36]

Society and culture

53 consolidated lawsuits against manufacturers of "GLP-1/DPP-4 products" were dismissed in 2015.[37]

Research

In 2016, work published showing that it can reverse impaired calcium signalling in steatotic liver cells, which, in turn, might be associated with proper glucose control.[24]

It is being evaluated for use in the treatment of Parkinson's disease.[38] A phase 3 clinical trial, started in January 2020 has an Estimated Study Completion Date of 30 June 2024 (NCT04232969).[39]

Notes and References

  1. Web site: Bydureon- exenatide injection, suspension, extended release Bydureon- exenatide kit . DailyMed . 28 February 2020 . 2 December 2020.
  2. Web site: Bydureon BCise- exenatide injection, suspension, extended release . DailyMed . 28 February 2020 . 2 December 2020.
  3. Web site: Byetta- exenatide injection . DailyMed . 28 February 2020 . 2 December 2020.
  4. Web site: Exenatide Monograph for Professionals . Drugs.com . American Society of Health-System Pharmacists . 22 March 2019 .
  5. Book: British national formulary : BNF 76. 2018. Pharmaceutical Press. 978-0-85711-338-2. 684–685. 76.
  6. Web site: Exenatide Pregnancy and Breastfeeding Warnings. Drugs.com . 3 March 2019 .
  7. Web site: Exenatide - Drug Usage Statistics . ClinCalc . 7 October 2022.
  8. Web site: Byetta 10 micrograms solution for injection, prefilled pen - Summary of Product Characteristics. Electronic Medicines Compendium. 21 April 2018. 30 March 2017.
  9. Web site: Bydureon 2 mg powder and solvent for prolonged-release suspension for injection in pre-filled pen - Summary of Product Characteristics. Electronic Medicines Compendium. 21 April 2018. 10 November 2017. 20 August 2020. https://web.archive.org/web/20200820053220/https://www.medicines.org.uk/emc/product/3650/smpc. dead.
  10. Shyangdan DS, Royle P, Clar C, Sharma P, Waugh N, Snaith A . Glucagon-like peptide analogues for type 2 diabetes mellitus . The Cochrane Database of Systematic Reviews . 10 . CD006423 . October 2011 . 2011 . 21975753 . 6486297 . 10.1002/14651858.cd006423.pub2 .
  11. https://www.drugs.com/cons/byetta.html Drugs.com Accessed September 6, 2008
  12. https://www.fda.gov/Medwatch/SAFETY/2007/safety07.htm#Byetta 2007 Safety Alerts for Drugs, Biologics, Medical Devices, and Dietary Supplements
  13. Web site: Byetta (exenatide) FDA warning . . 18 October 2007 .
  14. https://www.nytimes.com/2008/08/27/business/27drug.html Diabetes Drug Tied to New Deaths
  15. Lai SW, Muo CH, Liao KF, Sung FC, Chen PC . Risk of acute pancreatitis in type 2 diabetes and risk reduction on anti-diabetic drugs: a population-based cohort study in Taiwan . The American Journal of Gastroenterology . 106 . 9 . 1697–1704 . September 2011 . 21577242 . 10.1038/ajg.2011.155 . 25665019 .
  16. Gonzalez-Perez A, Schlienger RG, Rodríguez LA . Acute pancreatitis in association with type 2 diabetes and antidiabetic drugs: a population-based cohort study . Diabetes Care . 33 . 12 . 2580–2585 . December 2010 . 20833867 . 2992194 . 10.2337/dc10-0842 .
  17. Buse JB, Henry RR, Han J, Kim DD, Fineman MS, Baron AD . Effects of exenatide (exendin-4) on glycemic control over 30 weeks in sulfonylurea-treated patients with type 2 diabetes . Diabetes Care . 27 . 11 . 2628–2635 . November 2004 . 15504997 . 10.2337/diacare.27.11.2628 . free .
  18. Web site: Silverman E . Lilly's Once-Weekly Byetta May Have Cancer Risk . https://web.archive.org/web/20100606210411/http://pharmalot.com/2010/04/lillys-once-weekly-byetta-may-have-cancer-risk . 6 June 2010 . dead . Pharmalot . 12 April 2010 .
  19. Web site: FDA investigating reports of possible increased risk of pancreatitis and pre-cancerous findings of the pancreas from incretin mimetic drugs for type 2 diabetes . 14 March 2013 . 3 March 2013 . FDA . U.S. Food and Drug Administration.
  20. Web site: European Medicines Agency investigates findings on pancreatic risks with GLP-1-based therapies for type-2 diabetes . 26 March 2013 . 26 March 2013 . EMA . European Medicines Agency Sciences Medicines Health . 28 August 2021 . https://web.archive.org/web/20210828082926/https://www.ema.europa.eu/en/news/european-medicines-agency-investigates-findings-pancreatic-risks-glp-1-based-therapies-type-2 . dead .
  21. Koole C, Reynolds CA, Mobarec JC, Hick C, Sexton PM, Sakmar TP . Genetically encoded photocross-linkers determine the biological binding site of exendin-4 peptide in the N-terminal domain of the intact human glucagon-like peptide-1 receptor (GLP-1R) . The Journal of Biological Chemistry . 292 . 17 . 7131–7144 . April 2017 . 28283573 . 5409479 . 10.1074/jbc.M117.779496 . free .
  22. Bunck MC, Diamant M, Cornér A, Eliasson B, Malloy JL, Shaginian RM, Deng W, Kendall DM, Taskinen MR, Smith U, Yki-Järvinen H, Heine RJ . One-year treatment with exenatide improves beta-cell function, compared with insulin glargine, in metformin-treated type 2 diabetic patients: a randomized, controlled trial . Diabetes Care . 32 . 5 . 762–768 . May 2009 . 19196887 . 2671094 . 10.2337/dc08-1797 .
  23. Ding X, Saxena NK, Lin S, Gupta NA, Gupta N, Anania FA . Exendin-4, a glucagon-like protein-1 (GLP-1) receptor agonist, reverses hepatic steatosis in ob/ob mice . Hepatology . 43 . 1 . 173–181 . January 2006 . 16374859 . 2925424 . 10.1002/hep.21006 .
  24. Ali ES, Hua J, Wilson CH, Tallis GA, Zhou FH, Rychkov GY, Barritt GJ . The glucagon-like peptide-1 analogue exendin-4 reverses impaired intracellular Ca(2+) signalling in steatotic hepatocytes . Biochimica et Biophysica Acta (BBA) - Molecular Cell Research . 1863 . 9 . 2135–2146 . September 2016 . 27178543 . 10.1016/j.bbamcr.2016.05.006 . free .
  25. Tushuizen ME, Bunck MC, Pouwels PJ, van Waesberghe JH, Diamant M, Heine RJ . Incretin mimetics as a novel therapeutic option for hepatic steatosis . Liver International . 26 . 8 . 1015–1017 . October 2006 . 16953843 . 10.1111/j.1478-3231.2006.01315.x . 32332119 .
  26. Raufman JP . Bioactive peptides from lizard venoms . Regulatory Peptides . 61 . 1 . 1–18 . January 1996 . 8701022 . 10.1016/0167-0115(96)00135-8 . 5293453 .
  27. News: Molteni M, Chen E . GLP-1 drugs are transforming diabetes, obesity and more. Could a Nobel be next? . October 16, 2024 . STAT News . September 30, 2023.
  28. News: Schwarcz J . The Right Chemistry: How the Gila monster assisted weight-loss research . October 16, 2024 . The Montreal Gazette . May 26, 2023.
  29. News: Winkler R, Cohen B . Monster Diet Drugs Like Ozempic Started With Actual Monsters . October 16, 2024 . The Wall Street Journal . June 23, 2023 . subscription.
  30. News: Dunaief D . Setauket scientist Andrew Young’s work paves way for drugs like Ozempic . October 16, 2024 . TBR News Media . August 31, 2023.
  31. News: Pollack A . Eli Lilly in Deal For the Rights To a New Drug For Diabetes . The New York Times . September 21, 2002 . C1.
  32. News: Pollack . Andrew . Lizard-Derived Diabetes Drug Is Approved by the F.D.A. . November 2, 2024 . The New York Times . April 30, 2005 . subscription.
  33. Web site: CDER Drug and Biologic Approvals for Calendar Year 2005 . U.S. Food and Drug Administration (FDA) . 4 September 2006 . https://web.archive.org/web/20060904041024/https://www.fda.gov/cder/rdmt/InternetNDA05.htm . 4 September 2006 . dead . 8 March 2024.
  34. Web site: Drug Approval Package: Byetta (Exenatide) NDA #021773 . U.S. Food and Drug Administration (FDA) . 8 March 2024.
  35. News: Staton . Tracy . Amylin gets Byetta custody in split with Lilly . November 2, 2024 . Fierce Pharma . November 8, 2011.
  36. News: Barnes O . Can Eli Lilly become the first $1tn drugmaker? . Financial Times . October 2, 2024 . subscription.
  37. News: Moylan T . Preemption Summary Judgment Granted In Incretin-Mimetic Multidistrict Litigation . Lexisnexis . 11 November 2015.
  38. Kim DS, Choi HI, Wang Y, Luo Y, Hoffer BJ, Greig NH . A New Treatment Strategy for Parkinson's Disease through the Gut-Brain Axis: The Glucagon-Like Peptide-1 Receptor Pathway . Cell Transplantation . 26 . 9 . 1560–1571 . September 2017 . 29113464 . 5680957 . 10.1177/0963689717721234 .
  39. Web site: Bailey S . 30 November 2021 . The Bydureon (exenatide) phase 3 trial . 11 September 2022 . Cure Parkinson's . en-GB.

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