Tirzepatide Overview

Tirzepatide, a synthetic polypeptide drug, is the first dual agonist of GLP - 1 and GIP receptors. Given via once - weekly subcutaneous injection, it regulates blood glucose through a dual - action mechanism. Activating GLP - 1 receptor promotes insulin secretion and inhibits glucagon release, while GIP receptor activation boosts insulin sensitivity and secretion.It also delays gastric emptying, increases satiety, reduces food intake, and helps with weight loss. Additionally, it raises adiponectin levels, improving insulin sensitivity and lipid metabolism.Clinical trials show Tirzepatide is better than single GLP - 1 agonists in blood glucose control, significantly lowering HbA1c. It's effective for weight loss (average > 20%) and obesity treatment. The once - weekly injection improves patient compliance, and it has fewer side - effects. It also benefits blood pressure and lipid profile, showing potential cardio protection.

Peptide Information

Property	Value
Peptide Sequence	Tyr-{Aib}-Glu-Gly-Thr-Phe-Thr-Ser-Asp-Tyr-Ser-Ile-{Aib}-Leu-Asp-Lys-Ile-Ala-Gln-{diacid-C20-gamma-Glu-(AEEA)2-Lys}-Ala-Phe-Val-Gln-Trp-Leu-Ile-Ala-Gly-Gly-Pro-Ser-Ser-Gly-Ala-Pro-Pro-Pro-Ser-NH₂
Molecular Formula	C₂₂₅H₃₄₈N₄₈O₆₈
Molecular Weight	4813 g/mol
CAS Number	2023788-19-2
PubChem CID	163285897
Synonyms	Zepbound; Mounjaro

Tirzepatide Research

What is the research background of Tirzepatide?

Tirzepatide is a synthetic polypeptide drug, and its development stems from a profound understanding of the limitations of existing GLP-1 receptor agonists in the treatment of type 2 diabetes and obesity. Although GLP-1 receptor agonists have already shown excellent performance in blood glucose control and weight loss, scientists have found that while they activate the GLP-1 receptor, their activation effect on the GIP receptor is relatively weak, which to a certain extent limits the therapeutic effect of the drugs. Therefore, the research and development team is committed to developing a new type of drug that can activate both the GIPR and GLP-1R simultaneously, in the hope of achieving more comprehensive and effective blood glucose control and weight management^[1] .

During the research and development process of Tirzepatide, scientists have carried out a large number of basic research and clinical trials. First of all, in the preclinical research stage, the pharmacodynamic characteristics of Tirzepatide were deeply evaluated through animal experiments, and its potential in blood glucose control and weight loss was verified. The results showed that Tirzepatide could significantly reduce the blood glucose level in animal models and also performed well in weight management. These positive findings laid a solid foundation for the subsequent clinical trials.

Subsequently, Tirzepatide entered the clinical trial stage, including phase I, II, and III trials. In the phase I trial, the safety, tolerability, and pharmacokinetic characteristics of the drug were mainly evaluated, and the results showed that Tirzepatide had good safety and tolerability. The phase II trial further explored the efficacy and safety of different doses of Tirzepatide in patients with type 2 diabetes, and preliminarily determined its effective dose range. The most crucial phase III clinical trials, such as the SURPASS series of studies, covered a large number of patients with type 2 diabetes. The results showed that Tirzepatide was significantly superior to existing GLP-1 receptor agonists, such as semaglutide, in reducing blood glucose and weight. This breakthrough result provided strong evidence support for the marketing application of Tirzepatide ^[1].

Tirzepatide is a polypeptide composed of 39 amino acids, in which individual amino acids have been structurally modified to improve its stability and efficacy. This unique structural design enables Tirzepatide to integrate the effects of two incretin hormones, GIP and GLP-1, into a single molecule, and activate the hormone receptors involved in blood glucose control through a dual mechanism of action. Specifically, Tirzepatide can act on both the pancreas and the central nervous system. On the one hand, it promotes insulin secretion and inhibits glucagon release, thereby effectively reducing blood glucose; on the other hand, by delaying gastric emptying and increasing satiety, it reduces appetite and food intake, and thus achieves weight management. This dual mechanism of action gives Tirzepatide unique advantages in the treatment of type 2 diabetes and obesity, providing patients with a more comprehensive treatment option^[1].

What is the mechanism of action of Tirzepatide?

Tirzepatide lowers blood glucose through multiple mechanisms working together, as follows: Activation of the GLP-1 receptor: Tirzepatide binds to the GLP-1 receptor on pancreatic β cells, mimicking the effect of natural GLP-1. GLP-1 is a hormone produced in the intestine and is crucial for maintaining glucose homeostasis 2. It can promote insulin synthesis, insulin secretion, and glucose sensing, and reduce glucagon secretion to promote satiety and inhibit appetite 2.

This activation can promote insulin secretion. Insulin is the main blood glucose-lowering hormone in the body, which can increase the uptake and utilization of glucose by cells, thereby reducing blood glucose levels. In patients with type 2 diabetes, insulin secretion is insufficient or the cells' sensitivity to insulin is reduced, leading to an increase in blood glucose. Tirzepatide increases insulin secretion by activating the GLP-1 receptor, which helps to improve blood glucose control. At the same time, the activation of the GLP-1 receptor can also inhibit the release of glucagon. Glucagon usually promotes glycogenolysis and gluconeogenesis in the fasting state, increasing blood glucose production. By inhibiting the effect of glucagon, Tirzepatide further reduces the source of blood glucose, which helps to control blood glucose ^[2](Anonymous, 2023).

Activation of the GIP receptor: Tirzepatide acts on the GIP receptor at the same time. After activation, it can enhance insulin sensitivity and secretion. The GIP receptor is mainly present in tissues such as pancreatic β cells. After activation, through the conduction of the intracellular signaling pathway, insulin secretion is increased, and the cells' responsiveness to insulin is improved, thereby more effectively reducing blood glucose 2. Tirzepatide is the first-in-class dual glucagon-like peptide-1 and glucose-dependent insulinotropic polypeptide (GIP) analog, approved for the treatment of adult patients with type 2 diabetes mellitus as an adjunct to diet and exercise 2. Tirzepatide is a synthetic chemical structure based on the GIP sequence, composed of a 39-amino acid peptide. It increases insulin secretion, reduces the release of glucagon in a glucose-dependent manner, lowers fasting and postprandial blood glucose levels, promotes satiety, reduces weight, and delays gastric emptying 2.

This dual receptor agonist effect makes Tirzepatide more effective in promoting insulin secretion and inhibiting glucagon release than single GLP-1 receptor agonists ^[2].

Delaying gastric emptying and increasing satiety: Tirzepatide can delay gastric emptying, prolong the residence time of food in the stomach, slow down the absorption rate of nutrients, and thus avoid a sharp increase in postprandial blood glucose. In preclinical and clinical studies, the effect of Tirzepatide on gastric emptying is comparable to that of GLP-1 receptor agonists. In diet-induced obese mice, the degree of delayed gastric emptying by Tirzepatide is similar to that of semaglutide, but these acute inhibitory effects disappear after 2 weeks of treatment. In participants with and without type 2 diabetes, once-weekly Tirzepatid (≥5 and ≥4.5mg, respectively) delayed gastric emptying after a single dose. In healthy participants, this effect was attenuated after multiple doses of Tirzepatide or dulaglutide^[3] .

At the same time, it can also act on the central nervous system, increase satiety, and reduce appetite and food intake. By controlling diet intake, it indirectly helps to control blood glucose levels, especially suitable for the obesity problem often accompanied by patients with type 2 diabetes, and helps to improve insulin resistance and the overall metabolic status ^[2].

Improving insulin sensitivity and lipid metabolism: Tirzepatide has been found to increase the level of adiponectin, which is an adipocytokine related to insulin sensitivity. An increase in the level of adiponectin helps to improve insulin sensitivity, making cells more sensitive to insulin, and thus more effectively taking up and utilizing glucose, reducing blood glucose ^[2].

In addition, Tirzepatide can also improve the lipid profile and has a potential protective effect on cardiovascular health. Tirzepatide has been proven to be able to improve blood pressure, reduce low-density lipoprotein (LDL) cholesterol and triglycerides^[4].This further supports its comprehensive benefits in blood glucose management.

Related research

Efficacy on weight management in patients with obesity and type 2 diabetes:

Multiple clinical studies have confirmed significant weight loss effects: In a study named "SURMOUNT-2", this trial was a phase 3, double-blind, randomized, placebo-controlled trial conducted in seven countries. Adults (aged ≥18 years) with a body mass index (BMI) of 27 kg/m² or higher and a glycated hemoglobin (HbA₁c) of 7 - 10% were randomly assigned to receive a once-weekly subcutaneous injection of Tirzepatide (10mg or 15mg) or placebo for 72 weeks. The results showed that at week 72, the percentage of weight loss in the Tirzepatide 10mg and 15mg groups was -12.8% and -14.7%, respectively, while that in the placebo group was -3.2%. The estimated treatment differences of Tirzepatide 10mg and 15mg compared with the placebo were -9.6 percentage points and -11.6 percentage points, respectively, both of which were statistically significant (p＜0.0001). In addition, more patients treated with Tirzepatide reached the threshold of a weight loss of 5% or more (79 - 83% vs 32%) ^[5](Garvey W T, 2023). In the "SURMOUNT-2" study, the baseline average weight was 100.7 kg, the BMI was 36.1 kg/m², and the HbA₁c was 8.02%. After 72 weeks of treatment, Tirzepatide not only significantly reduced weight but also played a positive role in blood glucose control ^[5].

Improvement effect on diabetes-related neuropathy:

Some studies have pointed out that glucagon-like peptide 1 receptor agonists (GLP1-RAs) can reduce the risk of dementia in patients with type 2 diabetes by improving memory, learning, and overcoming cognitive impairment. As a dual glucose-dependent insulin polypeptide receptor agonist (GIP-RA)/GLP-1RA, Tirzepatid was studied for its effects on markers of neuronal growth (CREB and BDNF), apoptosis (BAX/Bcl2 ratio), differentiation (pAkt, MAP2, GAP43, and AGBL4), and insulin resistance (GLUT1, GLUT4, GLUT3, and SORBS1) in a neuroblastoma cell line (SHSY5Y). The results for the first time emphasized the role of Tirzepatide in activating the pAkt/CREB/BDNF pathway and downstream signaling cascades, as well as its efficacy in neuroprotection. It also showed that Tirzepatide could counteract the effects related to hyperglycemia and insulin resistance at the neuronal level. Therefore, Tirzepatide can improve the neurodegeneration caused by hyperglycemia and overcome neuronal insulin resistance, providing new insights into the improvement of diabetes-related neuropathy^[6] .

Research progress in the treatment of type 2 diabetes:

Some studies have pointed out that Tirzepatide, as a new type of hypoglycemic drug, has become the first dual GIP/GLP-1R agonist approved for the treatment of diabetes in the United States. It has been confirmed to have significant blood glucose-lowering and weight loss effects in multiple large-scale clinical trials, and there is evidence that it also has great potential in cardiovascular protection. In addition, the concept of synthetic peptides has opened up many unknown possibilities for Tirzepatide. Ongoing trials (NCT04166773) and evidence suggest that it appears to be a promising drug in the fields of non-alcoholic fatty liver disease (NAFLD), renal and neuroprotection, etc. ^[7].

Long-term effects of Tirzepatide on cardiovascular health:

Tirzepatide may reduce the risk of cardiovascular diseases by promoting weight loss. A study examined the impact of Tirzepatide on obesity and cardiovascular disease events in American adults^[8] . The study found that among American adults eligible for Tirzepatide treatment, after treatment with 15mg of Tirzepatide, it was estimated that 70.6% and 56.7% of adults had a weight loss of ≥15% and ≥20%, respectively, which meant that the number of obese people decreased by 58.8%. In people without cardiovascular diseases, the estimated 10-year risk of cardiovascular diseases decreased from 10.1% before treatment to 7.7% after treatment, reflecting an absolute risk reduction of 2.4% and a relative risk reduction of 23.6%, which means that 2 million cardiovascular disease events can be prevented within 10 years.

In conclusion, Tirzepatide is a novel dual agonist of GIP and GLP-1 receptors and is of great significance in the treatment of type 2 diabetes and obesity. It can more effectively promote insulin secretion, inhibit glucagon secretion, precisely regulate blood glucose, reduce the risk of complications, improve the function of pancreatic β cells, and delay the progression of diabetes. It also has a protective effect on the cardiovascular system. In the treatment of obesity, it can effectively reduce food intake, decrease appetite, increase satiety, help obese patients lose weight, and reduce the risk of obesity-related complications. It can also improve insulin resistance and lipid metabolism. In addition, it shows potential in the treatment of metabolic abnormality-related diseases such as non-alcoholic steatohepatitis, sleep apnea syndrome, and heart failure, and can simultaneously improve multiple metabolic indicators, providing a more comprehensive treatment plan. Its once-weekly injection administration method is convenient to use and can improve patients' treatment compliance. By effectively controlling blood glucose and weight and reducing the risk of complications, patients' physical conditions can be significantly improved, their daily activity ability and quality of life can be enhanced, their confidence in disease control can be increased, their psychological burden can be relieved, and their social adaptability can be improved.

Relevant Citations

[1] Nowak M, Nowak W, Grzeszczak W. Tirzepatide - a dual GIP/GLP-1 receptor agonist - a new antidiabetic drug with potential metabolic activity in the treatment of type 2 diabetes[J]. Endokrynologia Polska, 2022,73(4):745-755.DOI:10.5603/EP.a2022.0029.

[2] Anonymous. Tirzepatide: A Dual Glucose-Dependent Insulinotropic Polypeptide and Glucagon-Like Peptide-1 Agonist for the Management of Type 2 Diabetes: Erratum.[J]. American Journal of Therapeutics, 2023,30(3):e311.DOI:10.1097/MJT.0000000000001634.

[3] Urva S, Coskun T, Loghin C, et al. The novel dual glucose-dependent insulinotropic polypeptide and glucagon-like peptide-1 (GLP-1) receptor agonist tirzepatide transiently delays gastric emptying similarly to selectivelong-acting GLP-1 receptor agonists[J]. Diabetes Obesity & Metabolism, 2020,22(10):1886-1891.DOI:10.1111/dom.14110.

[4] Forzano I, Varzideh F, Avvisato R, et al. Tirzepatide: A Systematic Update[J]. International Journal of Molecular Sciences, 2022,23(23).DOI:10.3390/ijms232314631.

[5] Garvey W T, Frias J P, Jastreboff A M, et al. Tirzepatide once weekly for the treatment of obesity in people with type 2 diabetes (SURMOUNT-2): a double-blind, randomised, multicentre, placebo-controlled, phase 3 trial[J]. Lancet, 2023,402(10402):613-626.DOI:10.1016/S0140-6736(23)01200-X.

[6] Fontanella R A, Ghosh P, Pesapane A, et al. Tirzepatide prevents neurodegeneration through multiple molecular pathways[J]. Journal of Translational Medicine, 2024,22(1).DOI:10.1186/s12967-024-04927-z.

[7] Ma Z, Jin K, Yue M, et al. Research Progress on the GIP/GLP-1 Receptor Coagonist Tirzepatide, a Rising Star in Type 2 Diabetes[J]. Journal of Diabetes Research, 2023,2023.DOI:10.1155/2023/5891532.

[8] Wong N D, Karthikeyan H, Fan W. US Population Eligibility and Estimated Impact of Tirzepatide Treatment on Obesity Prevalence and Cardiovascular Disease Events[J]. Cardiovascular Drugs and Therapy, 2024.DOI:10.1007/s10557-024-07583-z.

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