GLP-1 receptor agonist

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Glucagon-like peptide-1 (GLP-1) receptor agonists, also known as GLP-1 analogs, GLP-1DAs or incretin mimetics, [1] are a class of drugs that reduce blood sugar and energy intake by activating the GLP-1 receptor. They mimic the actions of the endogenous incretin hormone GLP-1 that is released by the gut after eating.

Contents

GLP-1 agonists were initially developed for type 2 diabetes. The 2022 American Diabetes Association standards of medical care recommend GLP-1 agonists as a first line therapy for type 2 diabetes, specifically in patients with atherosclerotic cardiovascular disease or obesity. The drugs were also noted to reduce food intake and body weight significantly, and some have also been approved to treat obesity in the absence of diabetes. They are also in development for other indications, such as non-alcoholic fatty liver disease, polycystic ovary syndrome, and diseases of the reward system such as addictions.

Mechanism of action

GLP-1 agonists work by activating the GLP-1 receptor. They slow gastric emptying, inhibit the release of glucagon, and stimulate insulin production, therefore reducing hyperglycemia in people with type 2 diabetes. They also reduce food intake and therefore body weight, making them an effective treatment for obesity. [2] Another class of anti-diabetes drugs, the DPP-4 inhibitors, work by reducing the breakdown of endogenous GLP-1, and are generally considered less potent than GLP-1 agonists. [3] Some of the metabolic effects of GLP-1 agonists in rodents are mediated via increased synthesis of fibroblast growth factor 21 (FGF21). Dual GLP-1/FGF21 receptor agonists have been developed by pharmaceutical companies. [4]

Indications

Type 2 diabetes

GLP-1 agonists were developed initially for type 2 diabetes. [5] The 2022 American Diabetes Association (ADA) standards of medical care in diabetes include GLP-1 agonist or SGLT2 inhibitor as a first line pharmacological therapy for type 2 diabetes in patients who have or are at high risk for atherosclerotic cardiovascular disease or heart failure. They are also a first line treatment for people with both type 2 diabetes and kidney disease. Both types of medication can be combined with metformin. [6] [7] One of the advantages of GLP-1 agonists over older insulin secretagogues, such as sulfonylureas or meglitinides, is that they have a lower risk of causing hypoglycemia. [8] The ADA also recommends use of GLP-1 agonists instead of starting insulin in people with type 2 diabetes who need additional glucose control, except where there is catabolism, hyperglycemia above a certain threshold, or autoimmune diabetes is suspected. [6]

A 2021 meta-analysis found a 12 percent reduction in all-cause mortality when GLP-1 analogs are used in the treatment of type 2 diabetes, as well as significant improvements in cardiovascular and renal outcomes. [9] A meta-analysis including 13 cardiovascular outcome trials found that SGLT-2 inhibitors reduce the risk for three-point MACE, especially in subjects with an estimated glomerular filtration rate (eGFR) below 60 mL/min, whereas GLP-1 receptor agonists were more beneficial in persons with higher eGFR. [10] Likewise, the risk reduction due to SGLT-2 inhibitors was larger in populations with a higher proportion of albuminuria, but this relationship was not observed for GLP-1 receptor agonists. This suggests differential use of the two substance classes in patients with preserved and reduced renal function or with and without diabetic nephropathy, respectively. [10] GLP-1 agonists and SGLT2 inhibitors work to reduce HbA1c by different mechanisms, and can be combined for enhanced effect. It is also possible that they provide additive cardioprotective effects. [11]

GLP-1 agonists are not FDA approved for type 1 diabetes, but can be used off-label in addition to insulin to help type 1 diabetes patients improve their body weight and glucose control. [6]

Cardiovascular disease

GLP-1 agonists have demonstrated a cardioprotective effect when used to treat obesity. [12]

Obesity

GLP-1 agonists are recommended as an add-on therapy to lifestyle intervention (calorie restriction and exercise) in people with a BMI over 30 or a BMI over 27 with at least one weight-related comorbidity. [13] Although some GLP-1 agonists such as semaglutide are more effective than other weight loss drugs, they are still less effective than bariatric surgery in causing weight loss. [14] The weight reduction effects of GLP-1 agonists come from a combination of peripheral effects as well as activity in the brain via the central nervous system. [15]

Non-alcoholic fatty liver disease

GLP-1 agonists are being studied for the treatment of non-alcoholic fatty liver disease (NAFLD). They are at least as effective as the medications in current use, pioglitazone and Vitamin E, and significantly reduce steatosis, ballooning necrosis, lobular inflammation, and fibrosis according to a 2023 systematic review. [16] Semaglutide is in a Phase III study for non-alcoholic steatohepatitis, the more severe form of NAFLD, as of 2023. [17]

Polycystic ovary syndrome

GLP-1 agonists are recommended as a treatment for polycystic ovary syndrome, alone or in combination with metformin. The combination therapy has shown greater efficacy in improving body weight, insulin sensitivity, hyperandrogenism, and menstrual cycle irregularities. [18] This usage is off label. [19]

Depression

GLP-1 agonists have shown antidepressant and neuroprotective effects. They can also be used as treatment for the negative metabolic consequences of second-generation antipsychotics such as obesity. [20] [21]

Reward system disorders

GLP-1 agonists are under development for substance use disorder, a condition with few pharmacological treatment options. They reduce the self-administered intake of drugs and alcohol in non-human animals, although this effect has not been proven in humans. The mechanism of this addiction-reducing effect is unknown. [22] GLP-1 agonists are also under investigation for the treatment of binge eating disorder, which is the most common eating disorder. [23] [24]

Adverse effects

The most common adverse effects of GLP-1 agonists are gastrointestinal. [13] These adverse effects limit the maximum tolerated dose and require gradual dose escalation. [25] Nausea, vomiting, diarrhea, and constipation are all commonly reported. [13] Nausea is directly related to the serum concentration of the GLP-1 agonist and is reported in up to three-quarters of people using short-acting GLP-1 agonists but in fewer of those using long-acting agonists. Reactions at the injection site are also common, especially with shorter acting drugs. [26]

Human trials and meta-analyses have found no association between the drugs and pancreatitis or pancreatic cancer. However, some case reports of pancreatitis have emerged in postmarketing reports, and the American Association of Clinical Endocrinologists recommends caution in people with a history of pancreatitis. Discontinuation is recommended if acute pancreatitis occurs. A FDA black box warning is required for the risk of thyroid C-cell tumors, and the drugs are contraindicated if there is a family or personal history of medullary thyroid cancer or multiple endocrine neoplasia type 2a or 2b. [6] In mice, long-term use of GLP-1 agonists stimulates calcitonin secretion, leading to C-cell hypertrophy and an increased risk of thyroid cancer. However, no increased secretion of calcitonin has been observed in humans. [26]

Like insulin, GLP-1 agonists can cause or exacerbate retinopathy, but this is believed to be caused indirectly by a rapid drop in glucose rather than a direct effect. [6] Some patients develop anti-drug antibodies, which are more common with exenatide (the antibodies were detectable in a third or more of patients) than other GLP-1 agonists and can decrease the efficacy of the drug. [26] GLP-1 agonists increase the risk of gallstones when used to induce rapid weight loss. [13]

Patients who take glucagon-like peptide 1 (GLP-1) receptor agonists may be at increased risk of aspiration during anesthesia, due to delayed gastric emptying, according to case reports. In 2023, the American Society of Anesthesiologists suggested holding the GLP-1 agonists on the day of the procedure/surgery or a week prior. [27]

As of March 2024, there are 58 personal injury lawsuits for gastroparesis, ileus and intestinal blockage or obstruction in MDL 3094 before Judge Gene E.K. Pratter in the Eastern District of Pennsylvania. [28]

Drug delivery

Native GLP-1 is a peptide hormone with a half-life of 2 minutes because it is rapidly cleared by the enzyme dipeptidyl peptidase-4. [26] As a result, different GLP-1 agonist drugs are modified in various ways to extend the half-life, resulting in drugs that can be dosed multiple times per day, daily, weekly, or even less often. [26] Most synthetic GLP-1 agonists are delivered via subcutaneous injection, which is a barrier to their use and reason for discontinuation. [29] Most approved by the US FDA are sold as drug-device combination products. [30] Self-injected drugs are especially difficult for people with vision or motor difficulties, which are common in people with type 2 diabetes. [26] Attempts to develop an orally bioavailable GLP-1 agonist, either a modified peptide, as in the case of oral semaglutide, [29] or a small molecule drug have produced additional drug candidates. [25] Other companies have tested inhaled or transdermal administration. [26]

Cost

GLP-1 agonists are more expensive than other treatments for type 2 diabetes. A study compared the cost effectiveness of GLP-1 agonists to long-acting insulin in Taiwanese type 2 diabetes patients. In patients with CVD, GLP-1 agonists were estimated to save money due to fewer cardiovascular incidents. In patients without CVD, the cost per QALY was $9,093. [31] In the United States, cost is the highest barrier to GLP-1 agonist usage and was reported as the reason for discontinuation in 48.6 percent of US patients who stopped using the drugs. [32] According to another study, GLP-1 agonists are not cost effective for pediatric obesity in the United States. [33]

Approved

Combination and multiple target drugs

Some GLP-1 agonists, such as tirzepatide, are also agonists of the GIP receptor and/or glucagon receptor. These additional targets are hoped to improve the amount of weight loss caused by the drugs. [25] Combination with glucagon agonism is likely to make the drugs more efficacious for weight loss, at the expense of additional risk and a lower therapeutic index. [25]

GLP-1 agonists are available as combination medications with insulin to treat type 2 diabetes, although it is unclear whether these combination formulas offer an advantage over dosing insulin and GLP-1 agonists separately. [26] [40] The experimental formula cagrilintide/semaglutide combines semaglutide with a dual amylin and calcitonin receptor agonist for additional weight loss. [41]

Off-label and recreational use

Besides their medical uses, GLP-1 agonists are also sought by many people for cosmetic weight loss, popularized by influencers and celebrities. [42] Gray market sellers offer unauthorized products claimed to be GLP-1 agonists online. This practice is illegal in the United States, but some buyers turn to unauthorized retailers due to being denied insurance coverage and not being able to afford the name brand drug. [43] [44] [45] [46] [47] Buyers face risks due to counterfeit or substandard drugs sold by unauthorized sellers. [48]

Related Research Articles

Drugs used in diabetes treat diabetes mellitus by decreasing glucose levels in the blood. With the exception of insulin, most GLP-1 receptor agonists, and pramlintide, all diabetes medications are administered orally and are thus called oral hypoglycemic agents or oral antihyperglycemic agents. There are different classes of hypoglycemic drugs, and selection of the appropriate agent depends on the nature of diabetes, age, and situation of the person, as well as other patient factors.

<span class="mw-page-title-main">Anti-obesity medication</span> Class of pharmacological agents

Anti-obesity medication or weight loss medications are pharmacological agents that reduce or control excess body fat. These medications alter one of the fundamental processes of the human body, weight regulation, by: reducing appetite and consequently energy intake, increasing energy expenditure, redirecting nutrients from adipose to lean tissue, or interfering with the absorption of calories.

<span class="mw-page-title-main">Incretin</span> Group of gastrointestinal hormones

Incretins are a group of metabolic hormones that stimulate a decrease in blood glucose levels. Incretins are released after eating and augment the secretion of insulin released from pancreatic beta cells of the islets of Langerhans by a blood-glucose–dependent mechanism.

Enteroglucagon is a peptide hormone derived from preproglucagon. It is a gastrointestinal hormone, secreted from mucosal cells primarily of the colon and terminal ileum. It consists of 37 amino acids. Enteroglucagon is released when fats and glucose are present in the small intestine; which decrease the motility to allow sufficient time for these nutrients to be absorbed.

<span class="mw-page-title-main">Pramlintide</span> Diabetes medication

Pramlintide is an injectable amylin analogue drug for diabetes, developed by Amylin Pharmaceuticals. Pramlintide is sold as an acetate salt.

<span class="mw-page-title-main">Exenatide</span> Medication

Exenatide, sold under the brand name Byetta among others, is a medication used to treat type 2 diabetes. It is used together with diet, exercise, and potentially other antidiabetic medication. It is a treatment option after metformin and sulfonylureas. It is given by injection under the skin.

<span class="mw-page-title-main">Dipeptidyl peptidase-4 inhibitor</span> Enzyme blocker and diabetes treatment drug

Inhibitors of dipeptidyl peptidase 4 are a class of oral hypoglycemics that block the enzyme dipeptidyl peptidase-4 (DPP-4). They can be used to treat diabetes mellitus type 2.

<span class="mw-page-title-main">Glucagon-like peptide-1</span> Gastrointestinal peptide hormone Involved in glucose homeostasis

Glucagon-like peptide-1 (GLP-1) is a 30- or 31-amino-acid-long peptide hormone deriving from the tissue-specific posttranslational processing of the proglucagon peptide. It is produced and secreted by intestinal enteroendocrine L-cells and certain neurons within the nucleus of the solitary tract in the brainstem upon food consumption. The initial product GLP-1 (1–37) is susceptible to amidation and proteolytic cleavage, which gives rise to the two truncated and equipotent biologically active forms, GLP-1 (7–36) amide and GLP-1 (7–37). Active GLP-1 protein secondary structure includes two α-helices from amino acid position 13–20 and 24–35 separated by a linker region.

<span class="mw-page-title-main">Glucagon-like peptide-1 receptor</span> Receptor activated by peptide hormone GLP-1

The glucagon-like peptide-1 receptor (GLP1R) is a G protein-coupled receptor (GPCR) found on beta cells of the pancreas and on neurons of the brain. It is involved in the control of blood sugar level by enhancing insulin secretion. In humans it is synthesised by the gene GLP1R, which is present on chromosome 6. It is a member of the glucagon receptor family of GPCRs. GLP1R is composed of two domains, one extracellular (ECD) that binds the C-terminal helix of GLP-1, and one transmembrane (TMD) domain that binds the N-terminal region of GLP-1. In the TMD domain there is a fulcrum of polar residues that regulates the biased signaling of the receptor while the transmembrane helical boundaries and extracellular surface are a trigger for biased agonism.

<span class="mw-page-title-main">Liraglutide</span> Anti-diabetic medication

Liraglutide, sold under the brand names Victoza and Saxenda among others, is an anti-diabetic medication used to treat type 2 diabetes, and chronic obesity. It is a second-line therapy for diabetes following first-line therapy with metformin. Its effects on long-term health outcomes like heart disease and life expectancy are unclear. It is given by injection under the skin.

Albiglutide is a glucagon-like peptide-1 agonist drug marketed by GlaxoSmithKline (GSK) for treatment of type 2 diabetes. As of 2017 it is unclear if it affects a person's risk of death. GSK has announced that it intends to withdraw the drug from the worldwide market by July 2018 for economic reasons.

Lixisenatide is a once-daily injectable GLP-1 receptor agonist for the treatment of type 2 diabetes.

<span class="mw-page-title-main">Dulaglutide</span> Diabetes medication

Dulaglutide, sold under the brand name Trulicity among others, is a medication used for the treatment of type 2 diabetes in combination with diet and exercise. It is also approved in the United States for the reduction of major adverse cardiovascular events in adults with type 2 diabetes who have established cardiovascular disease or multiple cardiovascular risk factors. It is a once-weekly injection.

<span class="mw-page-title-main">Daniel J. Drucker</span> Canadian endocrinologist (born 1956)

Daniel Joshua Drucker is a Canadian endocrinologist. A Fellow of the Royal Society, he is a professor of medicine at the Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto. He is known for his research into intestinal hormones and their use in the treatment of diabetes, obesity, and other metabolic diseases, as well as intestinal failure.

<span class="mw-page-title-main">Semaglutide</span> Anti-diabetic and anti-obesity medication

Semaglutide is an antidiabetic medication used for the treatment of type 2 diabetes and an anti-obesity medication used for long-term weight management. It is a peptide similar to the hormone glucagon-like peptide-1 (GLP-1), modified with a side chain. It can be administered by subcutaneous injection or taken orally. It is sold under the brand names Ozempic and Rybelsus for diabetes, and under the brand name Wegovy for weight loss.

<span class="mw-page-title-main">Tirzepatide</span> Anti-diabetic medication

Tirzepatide, sold under the brand name Mounjaro among others, is an antidiabetic medication used for the treatment of type 2 diabetes and for weight loss. Tirzepatide is administered via subcutaneous injections.

<span class="mw-page-title-main">Orforglipron</span> Chemical compound

Orforglipron (LY-3502970) is a non-peptide glucagon-like peptide-1 receptor agonist developed as a weight loss drug by Eli Lilly and Company. It is easier to produce than GLP-1 agonists on the market in 2023 and is expected to be cheaper.

Glucagon receptor agonists are a class of drugs under development for the treatment of obesity, non-alcoholic fatty liver disease, and congenital hyperinsulinism.

GLP1 poly-agonist peptides are a class of drugs that activate multiple peptide hormone receptors including the glucagon-like peptide-1 (GLP-1) receptor. These drugs are developed for the same indications as GLP-1 receptor agonists—especially obesity, type 2 diabetes, and non-alcoholic fatty liver disease. They are expected to provide superior efficacy with fewer adverse effects compared to GLP-1 mono-agonists, which are dose-limited by gastrointestinal disturbances. The effectiveness of multi-receptor agonists could possibly equal or exceed that of bariatric surgery. The first such drug to receive approval is tirzepatide, a dual agonist of GLP-1 and GIP receptors.

Efinopegdutide (MK-6024) is a dual agonist of the glucagon and GLP-1 receptors. It is being developed by Merck for non-alcoholic fatty liver disease. It was also developed for type 2 diabetes and obesity but these indications were discontinued.

References

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