Everything below concerns incretin receptor. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-27. Where a claim depends on a specific study, the study is described rather than over-claimed.
Tirzepatide is a synthetic peptide composed of 39 amino acids. It acts as a dual agonist at two incretin receptors, the glucose-dependent insulinotropic polypeptide receptor and the glucagon-like peptide-1 receptor. The molecule was designed by modifying the native sequence of glucose-dependent insulinotropic polypeptide to improve metabolic stability and extend its circulation time. Its structure includes several non-natural amino acid residues and a fatty acid side chain. These features distinguish it from earlier single-receptor incretin analogs studied in the same period.
The compound first appeared in the scientific literature as an investigational agent for type 2 diabetes. Clinical development proceeded through phase 1, phase 2, and phase 3 programs that measured glycemic control as a primary endpoint while recording body weight as a secondary outcome. Regulatory approval in the United States followed in 2022 for glycemic control, and a separate indication for chronic weight management was added later. Subsequent trials have examined cardiovascular outcomes in adults with elevated cardiovascular risk. Debates continue over how much of the observed effect derives from each receptor arm.
Structural work on the molecule centers on a C20 fatty diacid moiety attached through a linker to the peptide backbone. This side chain promotes reversible binding to serum albumin, which slows renal clearance and supports a prolonged action profile. The peptide backbone incorporates aminoisobutyric acid substitutions that limit recognition by digestive enzymes. Together these modifications produce a molecule that is stable enough for subcutaneous delivery but still dependent on careful manufacturing control. Analytical characterization of the active pharmaceutical ingredient typically follows the conventions used for other synthetic peptides.
当前公开资料把 tirzepatide 归为肠促胰素类受体双重激动剂。它并非激素天然变体，而是经过序列改造的工程化肽。其分子量、等电点与疏水性等基础参数已在药典和化学数据库中收录，可作为分析检测和质量研究的参照。
Tirzepatide 是一种由 39 个氨基酸组成的合成肽，分子结构上以 GIP 序列为骨架并引入脂肪酸侧链修饰，使其能够同时与葡萄糖依赖性促胰岛素多肽（GIP）受体和胰高血糖素样肽-1（GLP-1）受体结合。这种双重激动特性使它在同类肽类药物中区别于选择性 GLP-1 受体激动剂。该分子最早由一家制药公司在 2010 年代报道，随后进入糖尿病与体重管理领域的临床研究。
在生理层面，GIP 与 GLP-1 均为肠道内分泌细胞分泌的肠促胰素，进食后参与胰岛素分泌调节与胃排空抑制。Tirzepatide 通过同时激活这两条信号通路，使胰岛素分泌的葡萄糖依赖性增强，并延缓冲胃排空、降低食欲信号。与单一 GLP-1 激动相比，双靶点作用在血糖控制和体重变化上的效应幅度更大，但具体贡献比例仍在研究之中。
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Dual incretin receptor agonist |
| Amino acid count | 39 residues | Includes non-natural residues |
| Approximate mass | 4.8 kDa | Reported values vary slightly by source |
| Fatty acid component | C20 diacid | Supports albumin binding |
| First US approval | 2022 | Glycemic indication, weight management followed |
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.
Published work supports the view that engaging two incretin receptors produces changes in glucose handling and body weight larger than those seen with single-receptor activation. Why that difference arises is not fully settled. Open questions include how much of the observed weight effect depends on central versus peripheral signaling, and whether the two receptors form interacting complexes. Most reported findings come from controlled trials and animal models, and translation between species is imperfect. Further research is expected to refine these points over time.
Tirzepatide is a synthetic peptide built from 39 amino acid residues. Its backbone derives from the native glucose-dependent insulinotropic polypeptide sequence, altered at several positions to resist enzymatic cleavage. A fatty diacid group attached through a linker extends plasma residence time by promoting reversible binding to serum albumin. The molecule carries a net negative charge near physiological pH and has a reported molecular weight close to 4813 daltons. These features separate it from shorter incretin analogs and account for its prolonged dosing interval.
Pharmacologically, tirzepatide activates two distinct G protein-coupled receptors: the glucose-dependent insulinotropic polypeptide receptor and the glucagon-like peptide-1 receptor. Binding at each target triggers cyclic AMP accumulation and downstream signaling in pancreatic beta cells, adipose tissue and the central nervous system. Because the two pathways overlap only partially, the combined effect on insulin secretion, glucagon suppression and appetite signaling differs from that of selective single-receptor compounds. Affinity is not equal across the two targets, and the clinical meaning of that imbalance remains an area of active study.
Clinical research programs have evaluated tirzepatide in adults with type 2 diabetes and in adults with obesity or excess weight. Trials generally reported reductions in glycated hemoglobin and body weight across treatment periods of several months. Since these studies enrolled defined populations under controlled conditions, the findings describe group averages rather than individual outcomes. Open questions include the durability of effects after treatment stops, variation among subgroups, and the long-term consequences of sustained dual receptor stimulation. Published trial summaries should be consulted for exact measurements rather than secondary accounts.
The WAV, run by the Ministry of Defence, recruited and trained female personnel for the WAAS and the WAMS, which respectively came under the Air and Defence Ministries. According to the official statement announcing their formation, the services' purpose was "to substitute women for men wherever necessary and practicable throughout the military and air forces within Southern Rhodesia." Recruitment for the women's services began in June 1941. Most volunteers were married women, many of them the wives of military men. The air and military services both offered a wide variety of positions. In addition to jobs as typists, clerks, caterers and the like, women served as drivers and in the stores and workshops. Many of the women in the air service did skilled work, checking flying instruments, testing parts and doing minor repairs. The women of the Auxiliary Police Service served as BSAP officers both in stations and on the streets. Members of Southern Rhodesia's white female population who did not join the forces still contributed to the war in various ways. Women worked in munitions factories and engineering workshops in Salisbury and Bulawayo. The Women's National Service League, which thousands of women joined before the war even started, revived the role white Rhodesian women had played in World War I, sending the colony's servicemen overseas parcels containing warm clothes, newspapers, razor blades, soap, food and minor luxuries such as sweets, tobacco and novels. Efforts such as these did much to keep the troops' morale up.
A tarball is a blob of crude oil (not to be confused with tar, which is a human-made product derived from pine trees or refined from petroleum) which has been weathered after floating in the ocean. Tarballs are an aquatic pollutant in most environments, although they can occur naturally, for example in the Santa Barbara Channel of California or in the Gulf of Mexico off Texas. Their concentration and features have been used to assess the extent of oil spills. Their composition can be used to identify their sources of origin, and tarballs may be dispersed over long distances by deep sea currents. They are slowly decomposed by bacteria, including Chromobacterium violaceum, Cladosporium resinae, Bacillus submarinus, Micrococcus varians, Pseudomonas aeruginosa, Candida marina and Saccharomyces estuari.
==== Officer of the Order of the British Empire (OBE) ==== Civil Division James Kepou. For services to the community and local Government Council. Henry Raisi Kila. For services to commerce and the community. Tembon Niki. For services to local government. Wilson Peni. For services to the community.
Sources: en.wikipedia.org
The company was founded in Pittsburgh, Pennsylvania, in 1902 by Chester Garfield Fisher (1881–1965), originally called the "Scientific Materials Co.". After obtaining his degree in engineering at Western University of Pennsylvania (now University of Pittsburgh), C.G. Fisher purchased the stockroom of the Pittsburgh Testing Laboratory. Fisher became a supplier of lab equipment and reagents for the area's industrial research. Early products included microscopes, burets, pipettes, litmus, balances, colorimeters, dissecting kits, and anatomical models. The first catalog, the 400 page Scientific Materials Co. Catalog of Laboratory Apparatus & Supplies, was published in 1904. Fisher established an R&D lab at his company in 1915. Edwin Fisher, Chester's brother, developed the Meker-Fisher burner in 1921, an advancement on the design of the Bunsen burner. The company manufactured an electric-combustion furnace and combustion train for analyzing carbon levels in steel, and an electrically heated and thermostatically controlled bacteriological incubator. In 1925, the company purchased Montreal-based Scientific Supplies, Ltd. The same year, the company was renamed Fisher Scientific. In 1940, Fisher Scientific acquired the New York supply company Eimer & Amend, which was founded in 1851 by Bernard G. Amend. Aiken Fisher, Chester's oldest son, became president of the company in 1949. In 1955, Fisher established a chemical manufacturing facility in Fair Lawn, New Jersey. In 1957, the company purchased the New York–based medical apparatus supply company E. Machlett & Sons.
Crossed Claisen condensations, in which the enolate and nucleophile are different esters, are also possible. An intramolecular Claisen condensation is called a Dieckmann condensation or Dieckmann cyclization, since it can be used to form rings. Esters can also undergo condensations with ketone and aldehyde enolates to give β-dicarbonyl compounds. A specific example of this is the Baker–Venkataraman rearrangement, in which an aromatic ortho-acyloxy ketone undergoes an intramolecular nucleophilic acyl substitution and subsequent rearrangement to form an aromatic β-diketone. The Chan rearrangement is another example of a rearrangement resulting from an intramolecular nucleophilic acyl substitution reaction.
=== Biosynthesis === In terms of biosynthesis, oxycodone has been found naturally in nectar extracts from the orchid family Epipactis helleborine; together along with other chemicals: 3-{2-{3-{3-benzyloxypropyl}-3-indol and 7,8-didehydro-4,5-epoxy-3,6-d-morphinan. Thodey et al., 2014 introduce a microbial compound manufacturing system for compounds including oxycodone. The Thodey platform produces both natural and semisynthetic opioids including this one. This system uses Saccharomyces cerevisiae with transgenes from Papaver somniferum (the opium poppy) and Pseudomonas putida to turn a thebaine input into other opiates and opioids.
During the 1990s, Brazil saw a surge of critical and commercial success with films such as O Quatrilho (Fábio Barreto, 1995), O Que É Isso, Companheiro? (Bruno Barreto, 1997) and Central do Brasil (Walter Salles, 1998), all of which were nominated for the Academy Award for Best Foreign Language Film, the latter receiving a Best Actress nomination for Fernanda Montenegro. The 2002 crime film City of God, directed by Fernando Meirelles, was critically acclaimed, scoring 90% on Rotten Tomatoes, being placed in Roger Ebert's Best Films of the Decade list and receiving four Academy Award nominations in 2004, including Best Director. Notable film festivals in Brazil include the São Paulo and Rio de Janeiro International Film Festivals and the Gramado Festival. The film I'm Still Here, directed by Walter Salles, was nominated for Best Actress (Torres) and Best Picture at the 97th Academy Awards, and won Best International Feature Film, becoming the first-ever Brazilian produced film to win an Academy Award. The film The Secret Agent had its world premiere at the main competition of the 2025 Cannes Film Festival on 18 May 2025, where it won the Best Actor prize for Wagner Moura, the Best Director prize for Mendonça and the FIPRESCI Prize. It received further widespread critical acclaim.
Sources: en.wikipedia.org
Alice in Chains were added as openers to Ozzy Osbourne's No More Tours tour. Days before the tour began, Staley broke his foot in an ATV accident, forcing him to use crutches on stage. During the tour, Starr was fired following the Hollywood Rock concert in Rio de Janeiro on January 22, 1993, and was replaced by former Ozzy Osbourne bassist Mike Inez. During June–August 1993, Alice in Chains joined Primus, Tool, Rage Against the Machine and Babes in Toyland for the alternative rock festival Lollapalooza, which was the last major tour the band played with Staley.
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== Nicholson atom theory == In 1911 John William Nicholson published a model of the atom based on classical electrodynamics along the lines of J.J. Thomson's plum pudding model but with the negative electrons orbiting a positive nucleus rather than circulating in a sphere. To avoid immediate collapse of this system he required that electrons come in pairs so the rotational acceleration of each electron was matched across the orbit. Nicholson developed his model based on the analysis of astrophysical spectroscopy. He connected the observed spectral line frequencies with the orbits of electrons in his atoms. The connection he adopted associated the atomic electron orbital angular momentum with the Planck constant. Whereas Planck focused on a quantum of energy, Nicholson's angular momentum quantum relates to orbital frequency. This new concept gave Planck constant an atomic meaning for the first time. Nicholson's model is rarely discussed today but it heavily influenced the important Bohr quantum atom model. Nicholson's spectral results were in good agreement with experiment, forcing Bohr to address these results in his subsequent theory. By 1913 Bohr had already shown, from the analysis of alpha particle energy loss, that hydrogen had only a single electron not a matched pair required by Nicholson's model. In his 1913 paper on atoms, Bohr cites Nicholson as finding quantized angular momentum important for the atom. Bohr quantization would associate emission with differences in the energy levels hydrogen rather than being directly related to the orbital frequency.
Sources: en.wikipedia.org
It activates both the glucose-dependent insulinotropic polypeptide receptor and the glucagon-like peptide-1 receptor. This dual activity separates it from agents that act on only one of the two receptors. The relative contribution of each receptor to clinical effects remains an open area of study.
United States approval for type 2 diabetes was granted in 2022, and a chronic weight management indication was added later. Approval timelines differ across other jurisdictions. Earlier human data came from phase 1 and phase 2 trials published before those decisions.
Native hormones are short-lived peptides that enzymes degrade within minutes. Tirzepatide carries non-natural residues and a fatty acid chain that resist this breakdown and extend circulation time. The result is a longer interval between administrations than the natural hormones could support.
它属于合成修饰肽，同时激动 GIP 与 GLP-1 两种肠促胰素受体。这类分子通常被称为双重肠促胰素受体激动剂，与选择性 GLP-1 激动剂在靶点范围上不同。