If you have been reading about fatty diacid and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-10-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
Development of tirzepatide took place under a research program that sought to test whether simultaneous engagement of two incretin receptors would produce greater metabolic effects than single-receptor agonism. Clinical trials were organized into the SURPASS series for type 2 diabetes and the SURMOUNT series for obesity and weight management. Regulatory clearance for type 2 diabetes came in 2022 in the United States, followed by approval for chronic weight management in 2023. The trial programs reported reductions in glycated hemoglobin and body weight relative to comparators, though long-term cardiovascular and durability data continue to accumulate.
The peptide backbone contains 39 amino acids and includes alpha-aminoisobutyric acid residues, which are not among the standard proteinogenic set. A C20 fatty diacid moiety is attached through a linker, allowing the compound to bind serum albumin and extend its circulation time. This albumin binding is the main reason the molecule supports once-weekly administration rather than more frequent dosing. The measured molecular mass is approximately 4,813 daltons, placing it firmly in the peptide rather than small-molecule class.
溶解操作一般使用注射用水或适宜的水性缓冲液，必要时加入少量助溶剂以改善溶解速度，但应避免剧烈涡旋振荡，因为剪切力可能促进聚集。配制后的溶液在冷藏条件下的稳定时间通常短于固体形态，具体时限取决于浓度、缓冲体系与容器材质。是否加入防腐成分，则取决于用途是否为多次取样。
定量分析的主流方法是反相高效液相色谱联用紫外或质谱检测，利用肽在疏水固定相上的保留行为确定纯度与含量。对于生物基质中的浓度测定，常采用液相色谱串联质谱，并配合固相萃取或蛋白沉淀进行样品前处理。免疫分析法也可使用，但可能受到结构相关肽的交叉反应干扰。
纯度评估通常综合反相色谱、体积排阻色谱与质谱三方面信息：前者反映疏水性杂质，后者反映聚集体，质谱则确认分子量与主要降解产物。有关降解途径的完整图谱——例如脱酰胺、氧化与水解各占多大比例——在不同储存条件下仍有差异，属于需要逐案验证的问题。
| Property | Value | Notes |
|---|---|---|
| Molecular class | Modified synthetic peptide | 39-residue backbone with non-natural residues |
| Receptor targets | GIP and GLP-1 | Dual incretin receptor agonist |
| Approximate molecular mass | 4,813 Da | Calculated from the peptide sequence |
| Administration route | Subcutaneous injection | Weekly schedule in approved products |
| Albumin binding | Present | Mediated by a C20 fatty diacid side chain |
The GIP receptor is expressed in pancreatic islets, adipose tissue, and the central nervous system, while GLP-1 receptors are found in pancreatic islets, the gastrointestinal tract, and the brain. Activation of both receptors can enhance glucose-dependent insulin secretion and reduce glucagon release. The relative contribution of each receptor to the overall pharmacological effect remains an area of ongoing investigation. Preclinical studies suggest that GIP receptor agonism may modulate appetite and energy balance, but the precise mechanisms in humans are not fully established.
In clinical research, tirzepatide has been studied in randomized controlled trials for glycemic control and body weight reduction. These trials typically measure changes in hemoglobin A1c and body weight over periods of several months. The drug is administered by subcutaneous injection, and its pharmacokinetic profile supports once-weekly dosing. Post-marketing surveillance continues to evaluate long-term outcomes and rare adverse events.
Tirzepatide is a synthetic peptide of 39 amino acids engineered from the native glucose-dependent insulinotropic polypeptide sequence. Its structure incorporates several non-natural residues and a C-terminal segment derived from glucagon-like peptide-1, together with a C20 fatty diacid moiety attached through a linker. The lipophilic side chain promotes binding to serum albumin, which slows renal clearance after administration. The compound is classified as a dual incretin receptor agonist and is supplied as a lyophilized powder for reconstitution or as a preformulated solution, depending on the presentation.
The peptide activates two G protein-coupled receptors, GIPR and GLP-1R. Binding triggers adenylyl cyclase activity and raises intracellular cyclic AMP in pancreatic beta cells, which potentiates insulin release when glucose is elevated. Signaling in the central nervous system is associated with reduced appetite and lower energy intake, while effects on gastric emptying and glucagon secretion are also reported. Because activity at both receptors is retained, the pharmacological profile is often described as incretin-based rather than selective for a single receptor.
===== GPIIb/IIIa activation ===== Collagen-mediated GPVI signalling increases the platelet production of thromboxane A2 (TXA2) and decreases the production of prostacyclin. This occurs by altering the metabolic flux of platelet's eicosanoid synthesis pathway, which involves enzymes phospholipase A2, cyclo-oxygenase 1, and thromboxane-A synthase. Platelets secrete thromboxane A2, which acts on the platelet's own thromboxane receptors on the platelet surface (hence the so-called "out-in" mechanism), and those of other platelets. These receptors trigger intraplatelet signaling, which converts GPIIb/IIIa receptors to their active form to initiate aggregation.
=== Choosing a support === Compatibility of support fabrics is crucial when selecting a support material. Because textiles vary so greatly careful research is necessary when making these choices. There are alternative options to fabric supports that are also important to consider. Composition, processing, structure, rigidity, and weight are all factors to consider when determining the appropriateness of a paper-based or non-textile material as a support for stabilization. The physical and chemical compatibility of textiles and long-term stability should also be evaluated for materials that will be stored in close proximity to textile artifacts.
Ultraviolet-fluorescence observations in some bloodstain regions have been interpreted as indicating that blood-related fluids may have reduced or prevented body-image formation in those areas, implying that the blood predated the image-forming process. This is further supported by microchemical tests in which, after protein material from blood-area fibers was removed, the linen fibers appeared similar to non-image fibers rather than to the body-image fibers.
Former Soviet Union leader Mikhail Gorbachev starred in a 1998 Pizza Hut commercial with his granddaughter Anastasia Virganskaya to raise money for the Perestroyka Archives. The ad "obviously exploited the shock value of having a former world leader appear... [and] played on the fact that Gorbachev was far more popular outside Russia than inside it". It was filmed on a multi-million budget with a cinematic quality, including mounting cameras on the Kremlin and shutting down Red Square to get the establishing shots of the square, and dialogue entirely in Russian with English subtitles, to show Pizza Hut as a global brand compared to its American rivals. More recently, Pizza Hut has had various celebrity spokespeople, including Jessica Simpson, the Muppets, Damon Hill, and Murray Walker. In 2000, Pizza Hut paid for their logo to appear on a Russian Proton rocket, which launched the Russian Zvezda module.
=== Location === Lower Saxony has a natural boundary in the north in the North Sea and the lower and middle reaches of the River Elbe, although parts of the city of Hamburg lie south of the Elbe. The state and city of Bremen is an enclave entirely surrounded by Lower Saxony. The Bremen/Oldenburg Metropolitan Region is a cooperative body for the enclave area. To the southeast, the state border runs through the Harz, low mountains that are part of the German Central Uplands. The northeast and west of the state, which form roughly three-quarters of its land area, belong to the North German Plain, while the south is in the Lower Saxon Hills, including the Weser Uplands, Leine Uplands, Schaumburg Land, Brunswick Land, Untereichsfeld, Elm, and Lappwald. In the northeast of Lower Saxony is the Lüneburg Heath. The heath is dominated by the poor, sandy soils of the geest, while in the central-east and southeast in the loess börde zone, productive soils with high natural fertility occur. Under these conditions—with loam and sand-containing soils—the land is well-developed agriculturally. In the west lie the County of Bentheim, Osnabrück Land, Emsland, Oldenburg Land, Ammerland, Oldenburg Münsterland, and on the coast East Frisia.
Sources: en.wikipedia.org
Residues from processing of uranium ore can also be a source of radon. Radon resulting from the high radium content in uncovered dumps and tailing ponds can be easily released into the atmosphere and affect people living in the vicinity. The release of radon may be mitigated by covering tailings with soil or clay, though other decay products may leach into groundwater supplies. Non-uranium mines may pose higher risks of radon exposure, as workers are not continuously monitored for radiation, and regulations specific to uranium mines do not apply. A review of radon level measurements across non-uranium mines found the highest concentrations of radon in non-metal mines, such as phosphorus and salt mines. However, older or abandoned uranium mines without ventilation may still have extremely high radon levels. In addition to lung cancer, researchers have theorized a possible increased risk of leukemia due to radon exposure. Empirical support from studies of the general population is inconsistent; a study of uranium miners found a correlation between radon exposure and chronic lymphocytic leukemia, and current research supports a link between indoor radon exposure and poor health outcomes (i.e., an increased risk of lung cancer or childhood leukemia).
==== Role in cardiac hypertrophy and fibrosis ==== Intracrine Ang II has been implicated in the development of cardiac hypertrophy, a process characterized by the enlargement of cardiac myocytes in response to increased workload or stress. Experimental models have shown that overexpression of non-secreted Ang II in cardiac cells leads to rapid hypertrophy independent of extracellular Ang II signaling. This suggests that intracellular Ang II plays a direct role in cardiomyocyte growth and structural remodeling. Similarly, intracrine Ang II contributes to myocardial fibrosis by upregulating profibrotic cytokines and growth factors, such as transforming growth factor-beta (TGF-β) and platelet-derived growth factor (PDGF). This promotes the excessive deposition of extracellular matrix proteins, leading to stiffening of the cardiac tissue and impaired cardiac function.
=== Pandora Papers === The October 2021 leak of more than 11.9 million documents by the International Consortium of Investigative Journalists (ICIJ) mentioned Sheikh Hazza as one of the Emirati royals with offshore holdings. The former national security adviser of the UAE reportedly owned the H Hotel office tower at 1 Sheikh Zayed Road, which gave space to at least four companies that provided offshore clients with financial or company formation services. Amongst these firms was SFM Corporate Services that had its office in the building until 2017. The ICIJ report said that SFM provided its services to owners of at least 2,977 firms in the UAE, the British Virgin Islands and other offshore financial centres. It was also revealed that Sheikh Hazza had his own offshore companies outside the UAE. In 2016, an Emirati law firm, Hadef & Partners assisted Sheikh Hazza to incorporate a UAE Company named Loomington Investments Ltd. The report revealed that two other companies with same name in the British Virgin Islands and Seychelles were owned by Sheikh Hazza.
==== Zonal necrosis ==== This is the most common type of drug-induced liver cell necrosis where the injury is largely confined to a particular zone of the liver lobule. It may manifest as a very high level of ALT and severe disturbance of liver function leading to acute liver failure.
Sources: en.wikipedia.org
=== Composition === The Composition C-4 used by the United States Armed Forces contains 91% RDX ("Research Department Explosive", an explosive nitroamine), bound by a mixture of 5.3% dioctyl sebacate (DOS) or dioctyl adipate (DOA) as the plasticizer (to increase the plasticity of the explosive), thickened with 2.1% polyisobutylene (PIB, a synthetic rubber) as the binder, and 1.6% of a mineral oil often called "process oil". Instead of "process oil", low-viscosity motor oil is used in the manufacture of C-4 for civilian use. The British PE4 consists of 88.0% RDX, 1.0% pentaerythrite dioleate and 11.0% DG-29 lithium grease (corresp. to 2.2% lithium stearate and 8.8% mineral oil BP) as the binder; a taggant (2,3-dimethyl-2,3-dinitrobutane, DMDNB) is added at a minimum of 0.10% weight of the plastic explosive, typically at 1.0% mass. The newer PE7 consists of 88.0% RDX, 1.0% DMDNB taggant and 11.0% of a binder composed of low molecular mass hydroxyl-terminated polybutadiene, along with an antioxidant and an agent preventing hardening of the binder upon prolonged storage. The PE8 consists of 86.5% RDX, 1.0% DMDNB taggant and 12.5% of a binder composed of di(2-ethylhexyl) sebacate thickened with high molecular mass polyisobutylene. Technical data according to the Department of the Army for the Composition C-4 follows.
== Veterinary use == Meloxicam is used in veterinary medicine mainly to treat dogs, but also sees off-label use in other animals such as cattle and exotics. In the European Union and other countries it is not considered off-label and can be used in cattle, pigs, horses, dogs, cats and guinea pigs. It has also been investigated as an alternative to diclofenac by the Royal Society for the Protection of Birds (RSPB) to prevent deaths of vultures. Depending on the animal species, each country or union of countries applies different guidelines or legal frameworks for the use of the drug, as well as different recorded side effects. The most common side effects in dogs include gastrointestinal irritation (vomiting, diarrhea, and ulceration). As far as the perioperative administration is concerned, in healthy dogs given meloxicam, no perioperative adverse effects on the cardiovascular system have been reported at recommended dosages. Perioperative administration of meloxicam to cats did not affect postoperative respiratory rate nor heart rate.
Stella Maris, the newly elected rector of St Andrews University, faces calls from students to apologise or resign after she said in an email that Palestinians had suffered "apartheid, siege, illegal occupation and collective punishment" during the Israel-Gaza war. 28 November – The Scottish Government publish a consultation for a new heating bill that will see the phasing out of gas boilers in Scotland, but the original start date of 2025 is expected to be delayed by three years.
Sources: en.wikipedia.org
It binds and activates both the GIP and GLP-1 receptors, making it a dual incretin receptor agonist. Single-receptor GLP-1 agonists act on one target only. The dual profile is the defining pharmacological feature of the molecule.
A fatty diacid side chain promotes reversible binding to serum albumin. This association slows renal clearance and protects the peptide from rapid enzymatic degradation. The result is a prolonged circulation time that supports weekly administration.
The first regulatory approval, for type 2 diabetes, was granted in the United States in 2022. An additional approval for chronic weight management followed in 2023. Availability and approved indications vary by country and are set by each national regulator.
建议在低温、避光、干燥环境中密封保存，常见条件为 2 至 8 摄氏度，长期存放可置于更低温度。应避免反复冻融，并尽量减少容器开启次数。