The short version of peptide backbone fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
Both receptors are class B G protein-coupled receptors that signal largely through Gs-mediated cyclic AMP production. Activation within pancreatic islets increases glucose-dependent insulin secretion and suppresses glucagon release when glucose is elevated. Outside the pancreas, signaling in the central nervous system and gut appears to influence appetite and gastric emptying. The relative contribution of each receptor to observed clinical effects remains under investigation, and the two pathways are not simply additive in practice.
Reported outcomes in large trials include dose-dependent weight reduction and improvements in glycemic markers over periods ranging from several months to more than a year. Whether the compound alters long-term cardiovascular or renal outcomes is being examined in dedicated outcome studies, so those questions remain open. Labeling describes gastrointestinal effects such as nausea and diarrhea, which tend to appear during dose escalation. Discontinuation rates and the durability of effects after treatment stops vary across study populations and are still debated.
Tirzepatide is a synthetic peptide developed as a dual agonist at the glucose-dependent insulinotropic polypeptide and glucagon-like peptide-1 receptors. Its structure is built on a GIP-derived backbone with non-natural amino acid substitutions and a fatty diacid side chain that promotes albumin binding and slows clearance. That modification supports once-weekly subcutaneous dosing. Registrational trial programs reported reductions in body weight and glycated hemoglobin alongside the drug's glycemic effects.
Identity and purity are established with reversed-phase high-performance liquid chromatography, often paired with mass spectrometry for confirmation of the expected mass. Peptide mapping after enzymatic digestion verifies the primary sequence and detects substitutions. Size-exclusion chromatography quantifies aggregates and fragments, which are the impurities most often tracked for peptides of this size. Residual solvents, counterions, and water content fall under separate tests described in pharmacopeial chapters. Circular dichroism or nuclear magnetic resonance may be used in research settings to probe secondary structure, though such methods are less common in routine release testing.
Peptide active ingredients of this type are typically supplied as lyophilized powder because the dry form resists hydrolysis during transport. The material is hygroscopic, so vials are usually equilibrated to room temperature before opening to avoid condensation on the solid. Repeated freeze-thaw cycles can promote aggregation and are generally avoided by aliquoting stock into single-use portions. Personnel handling the powder work in controlled environments to limit inhalation of fine particles. Written procedures usually specify these steps rather than leaving them to individual judgment.
Long-term storage of the solid generally relies on temperatures at or below minus twenty degrees Celsius, while short-term working stocks may be held refrigerated. Light exposure is limited because photodegradation can alter side chains over extended periods. Solutions prepared for analysis are less stable than the dry powder and are typically used within the same working day. Buffer choice matters, since some aqueous conditions favor deamidation or oxidation at specific residues. Stability data are usually generated under defined accelerated conditions and then extrapolated with stated assumptions.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic 39-residue peptide | GIP-derived backbone with non-natural residues |
| Molar mass | Approximately 4.8 kDa | Peptide chain plus linker and lipid modifications |
| Appearance | White to off-white powder | Typical of lyophilized research material |
| Solubility | Soluble in water and aqueous buffer | Practically insoluble in nonpolar solvents |
| Storage temperature | Typically −20 °C for dry powder | Solutions usually held at 2–8 °C short term |
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.
Tirzepatide is a synthetic peptide that acts as a dual agonist at the glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors. The molecule contains 39 amino acids and features a C20 fatty diacid moiety attached via a linker, which promotes albumin binding and extends its circulating half-life. Its sequence incorporates non-natural amino acids and modifications that reduce susceptibility to degradation by dipeptidyl peptidase-4. This dual receptor activity distinguishes it from selective GLP-1 receptor agonists.
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.
Routine characterization of the peptide relies on reversed-phase high-performance liquid chromatography for purity assessment, usually with ultraviolet detection near 214 nanometers. Intact mass measurement by liquid chromatography coupled to mass spectrometry confirms molecular identity against a theoretical value. Sequence-level confirmation uses enzymatic digestion followed by tandem mass spectrometry, an approach known as peptide mapping. Amino acid analysis gives an independent check on composition. Circular dichroism spectra are used to estimate helical content in aqueous buffer.
Stability depends strongly on physical form. The dry powder is generally regarded as stable for extended periods when held at or below minus twenty degrees Celsius in a sealed, desiccated container. In solution, degradation pathways include deamidation of asparagine and glutamine residues, oxidation of methionine, and aggregation. Reaction rates for these pathways rise with temperature. Repeated freezing and thawing of solutions promotes aggregation, and light exposure can accelerate some oxidative changes. Buffer composition and pH influence which pathway dominates at a given temperature.
Regulatory and quality discussions place the peptide within established guidance for synthetic peptides and biologics. Forced degradation studies, in which samples are exposed to heat, acid, base, peroxide, and light, identify likely degradation products and validate the selectivity of analytical methods. Reference standards allow comparison across laboratories and production batches. Purity specifications reported in the literature usually combine chromatographic purity with mass confirmation. Which impurity thresholds are meaningful for long-term behavior is still debated, and no single universal specification has been adopted across all jurisdictions.
On February 21, 2013, Eisold announced that Justin Benoit, a former live contributor to Cold Cave, had died. In support of the new singles, Cold Cave embarked on an extensive tour of Asia, performing in Japan, South Korea, China, Thailand, Nepal, and Hong Kong in April 2013; performed live with industrial/noise pioneer Boyd Rice in mid-2013; toured with synthpop artist Gary Numan in September 2013; and toured with Nitzer Ebb frontman Douglas McCarthy in October 2013. In January 2014, Cold Cave remixed the song "Running" by Nine Inch Nails as part of a remix EP Seed Eight, to coincide with the launch of Beats Music. In May 2014, Cold Cave opened for Nine Inch Nails on their full European and UK tour. They were also invited to open for Nine Inch Nails and Soundgarden on their North American tour, after Death Grips, the band originally chosen for opening, decided to split. Cold Cave began working on its third studio album and follow up to Cherish the Light Years tentatively titled Sunflower in 2013, and a release date in 2014 was originally anticipated. On what the potential sonic direction of the new album, Eisold said it would be a "mix between some of the bigger sounds on Cherish and more minimal stuff I'm interested in now, like Suicide or 39 Clocks." However tours in support of Full Cold Moon and the 2012–2013 singles series proved to be more fruitful than anticipated, and as a result, work on Sunflower was put on hold. In June 2015, Cold Cave performed at the wedding of Tony Hawk and Catherine Goodman at the Adare Manor in Ireland.
Dent, London, 1981) ISBN 978-0-460-04535-3 Is Life an Astronomical Phenomenon? (University College Cardiff Press, 1982) ISBN 9780906449493 Why Neo-Darwinism Does Not Work (with Fred Hoyle) (University College Cardiff Press, 1982) ISBN 9780906449509 Proofs that Life is Cosmic (with Fred Hoyle) (Institute of Fundamental Studies, Sri Lanka, Memoirs no.1, 1982) From Grains to Bacteria (with Fred Hoyle) (University College Cardiff Press, 1984) ISBN 9780906449646 Fundamental Studies and the Future of Science (ed.) (University College Cardiff Press, 1984) ISBN 9780906449578 Living Comets (with Fred Hoyle) (University College Cardiff Press, 1985) ISBN 9780906449790 Archaeopteryx, the Primordial Bird: A Case of Fossil Forgery (with Fred Hoyle) (Christopher Davies, Swansea, 1986) ISBN 9780715406656 The Theory of Cosmic Grains (with Fred Hoyle) (Kluwer, Dordrecht, 1991) ISBN 9780792311898 Life on Mars? The Case for a Cosmic Heritage (with Fred Hoyle) (Clinical Press, Bristol, 1997) ISBN 9781854570413 Astronomical Origins of Life: Steps towards Panspermia (with Fred Hoyle) (Kluwer, Dordrecht, 2000) ISBN 9780792360810 Cosmic Dragons: Life and Death on Our Planet (Souvenir Press, London, 2001) ISBN 9780285636064 Fred Hoyle's Universe (ed. with G. Burbidge and J. Narlikar) (Kluwer, Dordrecht, 2003) ISBN 9781402014154 A Journey with Fred Hoyle (World Scientific, Singapore, 2005) ISBN 9789812565792 Comets and the Origin of Life (with J. Wickramasinghe and W.
=== Resolution === Resolution of DKA is defined as the general improvement in the symptoms, such as the ability to tolerate oral nutrition and fluids, normalization of blood acidity (pH>7.3), and absence of ketones in the blood (<1 mmol/L) or urine. Once this has been achieved, insulin may be switched to the usual subcutaneously administered regimen, one hour after which the intravenous administration can be discontinued. In people with suspected ketosis-prone type 2 diabetes, determination of antibodies against glutamic acid decarboxylase and islet cells may aid in the decision whether to continue insulin administration long-term (if antibodies are detected), or whether to withdraw insulin and attempt treatment with oral medication as in type 2 diabetes. Generally speaking, routine measurement of C-peptide as a measure of insulin production is not recommended unless there is genuine doubt as to whether someone has type 1 or type 2 diabetes.
== Receptors == The five melanocortin receptors are seven-transmembrane G-protein coupled receptors with differing ligand affinities, tissue and cell type expression, and downstream functions. MC1R is expressed on melanocytes, macrophages, epithelial cells, endothelial cells, fibroblasts, monocytes and numerous other immune cells, but is also present in brain, testis, and intestine. Its main functions are in melanogenesis and anti-inflammatory signaling. MC2R is expressed in the adrenal cortex and adipocytes and promotes steroidogenesis. MC3R and MC4R are primarily expressed in the brain and regulate energy homeostasis. MC3R is additionally involved in immunomodulation while MC4R has a role in sexual function. MC5R is highly expressed in skin and adrenal glands and has a role in exocrine function. MC2R is activated exclusively by ACTH, whereas the other 4 receptors can be activated by ACTH, α-MSH, β-MSH, and γ-MSH, although the binding affinities differ. For all the melanocortin receptors, binding of an agonistic ligand activates the receptor, leading to dissociation of the G protein and activation of the enzyme adenyl cyclase. Adenyl cyclase then cleaves ATP to generate the second messenger cyclic AMP (cAMP), which in turn activates multiple downstream pathways. There are two known accessory proteins belonging to the melanocortin system which modulate function of the receptors. These are melanocortin-2-receptor accessory protein (MRAP) and MRAP2.
=== High blood pressure === Minoxidil, when used for hypertension, is generally reserved for use in severe hypertension patients who do not respond to at least two agents and a diuretic. Minoxidil is also generally administered with a loop diuretic to prevent sodium retention and potassium retention. It may also cause a reflex tachycardia and thus is prescribed with a beta blocker.
Sources: en.wikipedia.org
== Clinical application == CD38 inhibitors may be used as therapeutics for the treatment of asthma. CD38 has been used as a prognostic marker in leukemia. Daratumumab (Darzalex) which targets CD38 has been used in treating multiple myeloma. The use of Daratumumab can interfere with pre-blood transfusion tests, as CD38 is weakly expressed on the surface of erythrocytes. Thus, a screening assay for irregular antibodies against red blood cell antigens or a direct immunoglobulin test can produce false-positive results. This can be sidelined by either pretreatment of the erythrocytes with dithiothreitol (DTT) or by using an anti-CD38 antibody neutralizing agent, e.g. DaraEx.
"Any individual who is not a member of a federally recognized Cherokee tribe, in academia or otherwise, is hereby discouraged from claiming to speak as a Cherokee, or on behalf of Cherokee citizens, or using claims of Cherokee heritage to advance his or her career or credentials." – Joint Council of the Cherokee Nation and the Eastern Band of the Cherokee Indians The United Keetoowah Band did not sign or approve the resolution. The Cherokee Nation acknowledges the existence of people of Cherokee descent "... in states such as Arkansas, Kansas, Missouri, and Texas," who are Cherokee by ancestry but who are not considered citizens of the Cherokee Nation.
A 2017 literature review indicated there are numerous potential carcinogens of colorectal tissue in red meat, particularly those in processed red meat products, such as N-nitroso compounds, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic amines (HCAs). Cooking meat with "high-temperature methods, such as pan frying or grilling directly over an open flame", also causes formation of PAHs and HCAs.
Along the western coast of South America, water near the ocean surface is pushed westward due to the combination of the trade winds and the Coriolis effect. This process is known as Ekman transport. Colder water from deeper in the ocean rises along the continental margin to replace the near-surface water. This process cools the East Pacific because the thermocline is closer to the ocean surface, leaving relatively little separation between the deeper cold water and the ocean surface. The northward-flowing Humboldt Current carries colder water from the Southern Ocean to the tropics in the East Pacific. The combination of the Humboldt Current and upwelling maintains an area of cooler ocean waters off the coast of Peru. The West Pacific lacks a cold ocean current and has less upwelling as the trade winds are usually weaker than in the East Pacific, allowing the West Pacific to reach higher temperatures. These warmer waters provide energy for the upward movement of air. As a result, the warm West Pacific has, on average, more cloud and rain than the cool East Pacific. ENSO describes a quasi-periodic change of both oceanic and atmospheric conditions over the tropical Pacific Ocean. These changes affect weather patterns across much of the Earth. The tropical Pacific is said to be in one of three states of ENSO (also called "phases") depending on the atmospheric and oceanic conditions. When the tropical Pacific roughly reflects the average conditions, the state of ENSO is said to be in the neutral phase.
Sources: en.wikipedia.org
== Nasal drugs == The area of intranasal medication delivery provides a huge opportunity for research – both for specifically developed pharmaceutical drugs designed for intranasal treatment, as well as for investigating off-label uses of commonly available generic medications. Steroids, and a large number of inhalational anaesthetic agents are being used commonly. The recent developments in intranasal drug delivery systems are prodigious. Peptide drugs (hormone treatments) are also available as nasal sprays, in this case to avoid drug degradation after oral administration. The peptide analogue desmopressin is, for example, available for both nasal and oral administration, for the treatment of diabetes insipidus. The bioavailability of the commercial tablet is 0.1% while that of the nasal spray is 3-5% according to the SPC (Summary of Product Characteristics). Intranasal calcitonin, calcitonin-salmon, is used to treat hypercalcaemia arising out of malignancy, Paget's disease of bone, post menopausal and steroid induced osteoporosis, phantom limb pain and other metabolic bone abnormalities, available as Rockbone, Fortical and Miacalcin Nasal Spray. GnRH analogues like nafarelin and busurelin are used for the treatment of anovulatory infertility, hypogonadotropic hypogonadism, delayed puberty and cryptorchidism. Other potential drug candidates for nasal administration include anaesthetics, antihistamines (Azelastine), antiemetics (particularly metoclopramide and ondansetron) and sedatives that all benefit from a fast onset of effect.
Over a 10-year period starting in 2008, Burger King predicted 80 percent of its market share would be driven by foreign expansion, particularly in the Asia-Pacific and Indian subcontinent regional markets. While the TPG-led group continued BK's international expansion by announcing plans to open new franchise locations in Eastern Europe, Africa and the Middle East, and Brazil, the company plan is focusing on the three largest markets – India, China, and Japan. The company plans to add over 250 stores in these Asian territories, as well as other places such as Macau, by the end of 2012. Its expansion into the Indian market has the company at a competitive disadvantage with other fast food restaurants such as KFC because of the aversion of the country's large Hindu majority to beef. BK hopes to use their non-beef products, such as their TenderCrisp and TenderGrill chicken sandwiches, as well as other products like mutton sandwiches and veggie sandwiches, to help them overcome this hurdle to expand in that country. 3G has reported that it will continue with the plans to grow globally, even ramping up the planned expansion to help increase their return on investment. It is expected that 3G Brazilian-based management connections in the region may help Burger King expand in Brazil and Latin America, where it has been having problems finding acceptable franchisees. In December 2020, Burger King India went in for an initial public offering (IPO) on the BSE and NSE in India. The IPO was subscribed over 150 times.
To reduce pain the use of an exercise program of 13 to 24 weeks is recommended, with each session lasting 30 to 60 minutes. When different exercise programs are compared, aerobic exercise is capable of modulating the autonomic nervous function of fibromyalgia patients, whereas resistance exercise does not show such effects. A 2022 meta-analysis found that aerobic training showed a high effect size while strength interventions showed moderate effects. Meditative exercise seems preferable for improving sleep, with no differences between resistance, flexibility, and aquatic exercise in their favorable effects on fatigue.
Sources: en.wikipedia.org
It acts as an agonist at both the GIP and GLP-1 receptors, two related class B G protein-coupled receptors. This dual activity distinguishes it from single-receptor GLP-1 agonists. The clinical consequences of engaging both receptors are still being characterized.
It is given by subcutaneous injection, generally on a weekly schedule. Dosing usually begins low and increases in steps to limit gastrointestinal side effects. Formulated product is supplied as a ready-to-use pen or vial in most markets.
No. Receptor engagement is documented, but how central appetite circuits, gut signals, and insulinotropic effects combine is incompletely resolved. Investigators continue to separate GIP-driven from GLP-1-driven contributions in animal and human models.
Water promotes hydrolysis and deamidation, so removing it slows degradation during transport and storage. The dry solid is also less prone to microbial growth than a solution. Reconstitution is therefore performed close to the point of use.