If you have been reading about GIP receptor 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 2025-12-31. Where a claim depends on a specific study, the study is described rather than over-claimed.
Tirzepatide is a synthetic peptide built from 39 amino acid residues. Its sequence is related to human glucose-dependent insulinotropic polypeptide, with modifications that include a C-terminal extension and a C20 fatty diacid joined through a linker. Those changes raise the molecule's affinity for serum albumin, which slows renal filtration and lengthens the time it stays in circulation. The free base has an average molecular mass near 4813.5 daltons. The compound is made by solid-phase peptide synthesis followed by chromatographic purification.
At the receptor level, tirzepatide activates both the glucose-dependent insulinotropic polypeptide receptor and the glucagon-like peptide-1 receptor. Both belong to the class B family of G protein-coupled receptors and signal largely through cyclic AMP accumulation. The compound binds the two receptors with differing affinity, and the pattern of signaling at each site is described in the literature as biased rather than simply proportional to occupancy. Tissues carrying these receptors include pancreatic islets, adipose tissue, the central nervous system, and the gastrointestinal tract. The relative weight of each receptor population in producing metabolic effects continues to be studied.
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。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C225H348N48O68 | 39-residue synthetic peptide |
| Average molecular mass | About 4813.5 Da | Free base form |
| Appearance | White to off-white powder | Solid after lyophilization |
| Solubility class | Freely soluble in water | Also soluble in neutral aqueous buffers |
| Typical storage | At or below -20 °C, desiccated | Protect from light and moisture |
Clinical development proceeded through large phase 3 programmes in type 2 diabetes and in obesity or overweight with at least one weight-related comorbidity. Regulatory approvals followed in several jurisdictions for both indications. Weekly subcutaneous dosing reflects an elimination half-life of roughly five days. Open questions include the durability of metabolic effects after treatment stops, long-term cardiovascular and hepatic outcomes beyond completed trials, and whether the dual mechanism confers benefits independent of total receptor occupancy. Published literature continues to expand on these points. Substantial uncertainty remains about interindividual variability in response.
Tirzepatide is a synthetic linear peptide of 39 amino acids that acts as a dual agonist at the glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors. Its sequence derives from native GIP but incorporates non-natural residues and a C20 fatty diacid moiety linked to a lysine side chain. The lipophilic chain promotes albumin binding, which slows renal clearance and extends circulation time. The unmodified peptide has a molecular formula of C225H348N48O68 and a molecular mass near 4,813 daltons.
Receptor activation by tirzepatide raises intracellular cyclic AMP through Gs-coupled signalling at both targets. At the GLP-1 receptor the downstream effect includes glucose-dependent insulin release, suppressed glucagon secretion, delayed gastric emptying, and reduced appetite signalling in the hypothalamus. GIP receptor engagement adds insulinotropic activity and appears to influence lipid handling in adipose tissue. Because both receptors are stimulated at the same time, the pharmacological profile differs from that of selective GLP-1 receptor agonists, and the relative contribution of each arm remains an area of active investigation.
Long-term storage of lyophilised peptide powder is generally at minus twenty degrees Celsius or colder, with desiccant and protection from light. Short-term storage at two to eight degrees Celsius is common during active use. In solution, stability depends strongly on pH, concentration, and the presence of preservatives, and hydrolysis or aggregation can develop over weeks. Published stability data specific to this molecule are limited, so recommended conditions for research material are usually extrapolated from general peptide handling practice rather than from a dedicated study.
Bulk peptide material is normally characterised by reversed-phase high-performance liquid chromatography, which separates the target sequence from truncation products and other closely related impurities. Ultraviolet detection near 214 nanometres is common because the peptide backbone absorbs in that region. Mass spectrometry, usually electrospray ionisation coupled to a mass analyser, is used to confirm the molecular mass. Because the molecule carries a lipophilic side chain, gradient methods often need a relatively high organic modifier fraction to elute it within a practical retention window.
In 1893, for his contribution to the grape and wine industries of France, Jaeger was awarded the French Legion of Honor - Chevalier of the Légion d'honneur.[2] The grafting method was tested, and proved a success. The process was colloquially termed "reconstitution" by French wine growers. The cure for the disease caused a great division in the wine industry: some, who became known as the "chemists", rejected the grafting solution and persisted with the use of pesticides and chemicals. Those who became grafters were known as "Americanists", or "wood merchants". Following the demonstrated success of grafting in the 1870s and 1880s the immense task of "reconstituting" the majority of France's vineyards began. In the Cognac region, where chalky soils posed particular difficulties for American rootstocks, Léon Benjamin Croizet of Saint-Même-les-Carrières established experimental vineyards from 1871 and a public trial field in 1883, work that Louis Ravaz credited with contributing to the reconstitution of the Charentais vineyard; Croizet received the Legion of Honour in 1902 for these efforts.
Composition ornament ("compo") is a mouldable thermoplastic compound, consisting of powdered chalk mixed with collagen (hide glue), resin (pine rosin) and linseed oil in ratio 1 to 1 to 1 by volume.; worked either by hand or more usually pressed into moulds to produce decorative work. It's now most commonly seen as part of gilded picture frames, but was in use for many smaller decorative mouldings from the later part of the Baroque period.
Five Guys Enterprises, LLC (doing business as Five Guys Burgers and Fries and Five Guys) is an American multinational fast food chain focused on hamburgers, hot dogs, and french fries. It is headquartered in Alexandria, Virginia. The first Five Guys restaurant opened in 1986 in Arlington County, Virginia. By 2001, there were five locations in the Washington, D.C., metro area. In early 2003, Five Guys began franchising, beginning a period of rapid expansion. In a year and a half, permits had been sold for over 300 franchised locations. As of 2026, Five Guys had over 1,900 locations open worldwide. It was the fastest-growing fast food chain in the United States, with a 32.8% sales increase from 2010 to 2011.
Some symptoms attributable to allergic diseases are mentioned in ancient sources. Particularly, three members of the Roman Julio-Claudian dynasty (Augustus, Claudius and Britannicus) are suspected to have a family history of atopy. The concept of "allergy" was originally introduced in 1906 by the Viennese pediatrician Clemens von Pirquet, after he noticed that patients who had received injections of horse serum or smallpox vaccine usually had quicker, more severe reactions to second injections. Pirquet called this phenomenon "allergy" from the Ancient Greek words ἄλλος allos meaning "other" and ἔργον ergon meaning "work". All forms of hypersensitivity were previously classified as allergies, and all were thought to be caused by an improper activation of the immune system. Later, it became clear that several disease mechanisms were implicated, with a common link to disordered immune system activation. In 1963, a new classification scheme was designed by Philip Gell and Robin Coombs that described four types of hypersensitivity reactions, known as Type I to Type IV hypersensitivity. With this new classification, the word allergy, sometimes clarified as a true allergy, was restricted to type I hypersensitivities (also called immediate hypersensitivity), which are characterized as rapidly developing reactions involving IgE antibodies. A breakthrough in understanding the mechanisms of allergy was the discovery of the antibody class labeled immunoglobulin E (IgE).
Sources: en.wikipedia.org
The glucagon receptor is a 62 kDa protein that is activated by glucagon and is a member of the class B G-protein coupled family of receptors (secretin receptor family), coupled to Gs and to a lesser extent Gq, & potentially Gi. Stimulation of the Gs receptor results in the activation of adenylate cyclase, which in turn leads to increased levels of the secondary messengers intracellular cAMP and calcium. In humans, the glucagon receptor is encoded by the GCGR gene. Glucagon receptors are mainly expressed in liver and in kidney with lesser amounts found in heart, adipose tissue, spleen, thymus, adrenal glands, pancreas, cerebral cortex, and gastrointestinal tract.
Wells refused the offered freedom of the town, stating: "Bromley has not been particularly gracious to me nor I to Bromley and I don't think I want to add the freedom of Bromley to the freedom of the City of London and the freedom of the City of Brussels – both of which I have." He described Bromley in one of his novels as a "morbid sprawl of population".
== Uses == Along with pharmaceutical applications, it can find utility as food additives, antioxidant, colorant and many other sectors of food industries. Potential pharmaceutical uses of prodigiosin, or its use as a dyestuff, have led to studies of its production from Serratia marcescens, possibly after genetic modification.
=== Homology === GsMTx-4 shares less than 50% of its sequence homology with all other known peptide toxins. The highest percentage of sequence homology is shared with other tarantula toxins that block voltage-gated calcium channels and voltage-gated potassium channels. The ICK, as well as the residues F4, D13, and L20, are conserved in these tarantula toxins.
=== Immunology === Immunology is the branch of medicine that deals with the immune system, a network of biological systems that protects humans from diseases. The immune system detects and responds to pathogens, such as viruses, bacteria, and parasites, as well as cancer cells and foreign bodies. Humans have two major immune subsystems: The innate immune system, which provides a preconfigured response (e.g. defensins, complement system) to broad groups of situations and stimuli; and the adaptive immune system, which provides a tailored response to each stimulus by developing an immunological memory of molecules previously encountered. Mechanisms common to both subsystems, include phagocytosis, humoural immunity, cell-mediated immunity.
Sources: en.wikipedia.org
=== Shrinking and enlarging === Widespread private concerns related to penis size have led to a number of folklore sayings and popular culture reflections related to penis size. Penis panic is a form of mass hysteria involving the believed removal or shrinking of the penis, known as genital retraction syndrome. The penis can significantly shrink due to scar tissue formation from a condition called Peyronie's disease which affects up to 10% of men. Products such as penis pumps, pills, and other dubious means of penis enlargement are some of the most marketed products in email spam. At present there is no consensus in the scientific community of any non-surgical technique that permanently increases either the thickness or length of the erect penis that already falls into the normal range (4.5" to 6").
The first woman elected president of a country was Vigdís Finnbogadóttir of Iceland, who won the 1980 presidential election as well as three subsequent elections, remaining in office for a total of 16 years, which makes her the longest-serving non-hereditary female head of state in history. Vigdís was also the first woman to win a presidential election where the second place candidate was another woman: she defeated Sigrún Þorsteinsdóttir in the 1988 presidential election. The first democratically elected female prime minister of a Muslim majority country was Benazir Bhutto of Pakistan, who led her party to victory in the 1988 general election and later in 1993, making her the first woman democratically elected leader of any Muslim nation. Bhutto was also the first of only two non-hereditary female world leaders who gave birth to a child while serving in office, the other being Jacinda Ardern of New Zealand. The longest-tenured female non-hereditary head of government is Sheikh Hasina of Bangladesh. She served as the country's prime minister from June 1996 to July 2001 and again from January 2009 until August 2024, for a combined total of over 20 years. Finland was the first republic in which women served concurrently as both the head of state and head of government, with both Anneli Jäätteenmäki and Mari Kiviniemi serving as prime ministers under president Tarja Halonen.
Glutathione S-transferase kappa 1 (GSTK1) is an enzyme that in humans is encoded by the GSTK1 gene which is located on chromosome seven. It belongs to the superfamily of enzymes known as glutathione S-transferase (GST), which are mainly known for cellular detoxification. The GSTK1 gene consists of eight exons and seven introns and although it is a member of the GST family, its structure has been found to be similar to bacterial HCCA (2-hydroxychromene-2-carboxylate) isomerases and bacterial disulphide-bond-forming DsbA oxidoreductase. This similarity has later allowed the enzyme GSTK1 to be renamed to DsbA-L. Research has also suggested that several variations of the GSTK1 gene can be responsible for metabolic diseases and certain types of cancer.
Law enforcement and intelligence agencies in a number of countries arrested alleged terrorists. British Prime Minister Tony Blair said Britain stood "shoulder to shoulder" with the United States. In a speech to Congress nine days after the attacks, which Blair attended as a guest, President Bush declared "America has no truer friend than Great Britain." Subsequently, Prime Minister Blair embarked on two months of diplomacy to rally international support for military action; he held 54 meetings with world leaders. The U.S. set up the Guantanamo Bay detention camp to hold inmates they defined as "illegal enemy combatants." The legitimacy of these detentions has been questioned by the European Union and human rights organizations. On September 25, 2001, Iran's president Mohammad Khatami, meeting British Foreign Secretary Jack Straw, said: "Iran fully understands the feelings of the Americans about the terrorist attacks in New York and Washington on September 11." He said although the American administrations had been at best indifferent about terrorist operations in Iran, the Iranians felt differently and had expressed their sympathetic feelings with bereaved Americans in the tragic incidents in the two cities.
=== Artifact analysis === MicroPIXE is a useful technique for the non-destructive analysis of paintings and antiques. Although it provides only an elemental analysis, it can be used to distinguish and measure layers within the thickness of an artifact. The technique is comparable with destructive techniques such as the inductively coupled plasma (ICP) family of analyses.
Sources: en.wikipedia.org
It is a synthetic peptide and a dual agonist of two incretin receptors. It is not a small molecule, and it is not structurally related to the older single-receptor peptide agonists.
The C20 fatty diacid promotes tight binding to serum albumin. That binding reduces renal clearance and extends circulation time compared with an unmodified peptide of similar length.
It is not fully established. Studies indicate that both receptors contribute to the observed effects, but the exact split between the two signaling pathways in humans remains an open question.
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。