A practical reference on GIP receptor: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-11-10 and is reviewed periodically as new material appears.
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。
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.
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.
| Property | Value | Notes |
|---|---|---|
| 储存温度 | 2 至 8 摄氏度 | 固体粉末，避光密封 |
| 外观 | 白色至类白色冻干粉 | 溶解后为澄清至微乳光 |
| 溶解性 | 易溶于水性缓冲液 | 避免剧烈振荡 |
| 常规纯度方法 | 反相高效液相色谱 | 紫外或质谱检测 |
| 定量方法 | 液相色谱串联质谱 | 配合固相萃取前处理 |
Like most synthetic peptides of this size, the material is commonly supplied as a lyophilised powder that appears white to off-white. It dissolves in aqueous buffers and in mixtures of water with a small proportion of organic solvent, though the fatty acid portion reduces solubility in pure water relative to short peptides. Hygroscopic behaviour is reported for many peptide powders, so weighing is usually performed quickly and under controlled humidity. Working solutions are typically prepared fresh and kept cold.
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.
Tirzepatide is a synthetic peptide of 39 amino acids that carries a C20 fatty diacid side chain attached through a linker. Its molecular formula is C225H348N48O68, and its molecular weight is about 4813 daltons. The compound belongs to the incretin mimetic class and is administered by subcutaneous injection. The fatty acid chain promotes binding to serum albumin, which slows renal clearance and extends the circulation time of the molecule. It was identified during screening of sequences derived from glucose-dependent insulinotropic polypeptide.
Tirzepatide activates both the glucose-dependent insulinotropic polypeptide receptor and the glucagon-like peptide-1 receptor, making it a dual agonist rather than a selective agent. Engagement of the GLP-1 receptor is linked to glucose-dependent insulin release, slower gastric emptying, and reduced appetite signalling. The relative contribution of the GIP arm remains an active research question; proposed roles include improved insulin sensitivity and altered adipose tissue handling. Receptor occupancy studies suggest the molecule interacts with both targets at circulating concentrations achieved during therapy.
Development began in the 2010s, when researchers modified a GIP-based scaffold to add GLP-1 activity and then attached the fatty diacid to lengthen its half-life. Clinical evaluation proceeded through large phase 3 programmes in type 2 diabetes and in obesity, and regulators in the United States cleared the compound for type 2 diabetes in 2022 and for chronic weight management in 2023. Several cardiovascular and metabolic outcome studies are still reporting, so the picture of long-term benefit and risk is incomplete. Approvals in other regions followed on different timelines.
CooA is a heme-containing transcription factor that responds to the presence of carbon monoxide. This protein forms homodimers and is a homolog of cAMP receptor protein. The most well-studied CooA homolog comes from Rhodospirillum rubrum (RrCooA), but the homolog from Carboxydothermus hydrogenoformans (ChCooA) has also been characterized. The main structural difference between these homologs lies in ferric heme coordination. In RrCooA, the ferric heme iron is ligated by a cysteine and the amine of the N-terminal proline; in the ferrous state, a ligand switch occurs in which a histidine replaces the thiolate. In contrast, ChCooA features histidine and the N-terminal amine as ligands in both ferric and ferrous states.
81. ArXiv [Preprint]. 2026 Jul 29:arXiv:2605.17186v2. Operator splitting for exploiting linear-rate closure in solving infinite ODE hierarchies. Chang JC. We introduce an operator-splitting method for infinite hierarchies of linear ordinary differential equations (ODEs) indexed by nonnegative integers. When the coupling coefficients depend linearly on the count index, an exact transformation closes the equations on finite count-index windows without an upper-boundary value. For more general hierarchies, Strang splitting applies the linear-rate closure during the linear-rate substeps and a conventional capped solver to the remainder. We derive the closure from generating functions and the method of characteristics and extend it to multi-indexed systems. The derivation requires neither positivity nor mass conservation, so it applies to a wider class of systems than the examplar stochastic models presented here. We discuss branching processes, stochastic predator-prey dynamics, the Schlögl chemical kinetics model, and a telegraph model for gene expression. Through numerical experiments and computational cost analyses we demonstrate that our operator splitting method is typically advantageous for solving large scale systems in terms of memory usage and computational time, while retaining accuracy competitive with finite state projection (FSP) methods. PMCID: PMC13618430
A virtual reality game (VR game) is a video game played on virtual reality (VR) hardware. Most VR games are based on player immersion, typically through a head-mounted display unit or headset with stereoscopic displays and one or more controllers. The video game industry made early attempts at VR in the 1990s, most notably with Sega's VR-1 and Virtuality for arcades, along with unsuccessful attempts for home consoles with the Sega VR prototype and Nintendo's Virtual Boy. With the introduction of the first consumer-ready home VR product, the Oculus Rift, in 2013, home VR games soon followed, including existing games adapted for the VR hardware, and new games designed directly for VR. While VR hardware and games grew modestly for the remainder of the 2010s, Half-Life: Alyx, a full VR game developed by Valve and released in 2020, was considered the killer application for VR games.
Sources: en.wikipedia.org
== Diagnosis == Myiasis is often misdiagnosed in the United States because it is rare and its symptoms are not specific. Intestinal myiasis and urinary myiasis are especially difficult to diagnose. Clues that myiasis may be present include recent travel to an endemic area, one or more non-healing lesions on the skin, itchiness, movement under the skin or pain, discharge from a central punctum (tiny hole), or a small, white structure protruding from the lesion. Serologic testing has also been used to diagnose the presence of botfly larvae in human ophthalmomyiasis.
==== Soviet cinema ==== Between 1946 and 1954, the Soviet Union mimicked the US adoption of cinema as a weapon. The Central United Film Studios and the Committee on Cinema Affairs were committed to the Cold War battle. Under Stalin's rule, movies could only be made within strict confines. Cinema and government were, as it stood, inextricably linked. Many films were banned for being insufficiently patriotic. Nonetheless, the Soviet Union produced a plethora of movies with the aim to blatantly function as negative propaganda. In the same fashion as the United States, the Soviets were eager to depict their enemy in the most unflattering light possible. Between 1946 and 1950, 45.6% of on-screen villains in Soviet films were either American or British. Films addressed non-Soviet themes that emerged in American film in an attempt to derail the criticism and paint the US as the enemy. Attacks made by the United States against the Soviet Union were simply used as material by Soviet filmmakers for their own attacks on the US. Soviet cinema during this time took its liberty with history: "Did the Red Army engage in the mass rapes of German women and pillage German art treasures, factories, and forests? In Soviet cinema, the opposite was true in [The Meeting on the Elbe]." This demonstrated the heightened paranoia of the Soviet Union. Despite efforts made to elevate the status of cinema, such as changing the Committee of Cinema Affairs to the Ministry of Cinematography, cinema did not seem to work as invigorating propaganda as was planned.
Malagasy protesters in September–October 2025 used the symbol as a gesture against the government for inadequate water and power, with protesters using a variant of the flag with a pink-and-green satroka hat, traditional of the Betsileo people, in place of the regular straw hat. The icon was adopted by social media accounts associated with protesters. By 11 October, the military CAPSAT unit had refused to fire on the protesters and they launched a coup the following day, resulting in the flight and later impeachment of President Andry Rajoelina. Protesters proceeded to hang the flag at the capital Antananarivo's Place du 13 Mai. Some protest leaders, opposed to the military takeover, began distributing T-shirts with the Malagasy variant of the flag to protesters after the coup.
=== Wound management === Chitosan has the ability to adhere to fibrinogen, which produces increased platelet adhesion, causing clotting of blood and hemostasis. Chitosan may have other properties conducive to wound healing, including antibacterial and antifungal activity, which remain under preliminary research.
Sources: en.wikipedia.org
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。
溶解后的稳定时间通常短于固体形态，受浓度、缓冲液和容器材质影响。冷藏条件下一般只能维持较短时间，具体期限应通过实际稳定性实验确认。
反相高效液相色谱用于纯度与含量测定，液相色谱串联质谱用于生物基质中的定量，体积排阻色谱用于检测聚集体。多种方法结合才能较完整地表征样品。
It is a dual GIP and GLP-1 receptor agonist, frequently grouped with incretin-based peptide therapeutics. It is a peptide rather than a small molecule and is given by subcutaneous injection.