This is a working overview of GIP receptor, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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。
质量控制环节关注外观、含量、纯度、有关物质、水分与微生物限度等项目。检测结果需要有对照品和系统适用性数据支持，单次测定不足以判定批次的稳定性。实验室之间方法转移时，色谱柱品牌与梯度差异常导致保留时间漂移，因此方法验证十分必要。
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.
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.
| 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 |
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.
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.
Recommended storage for reference material is a freezer at approximately -20 degrees Celsius, protected from light and moisture. Commercial injectable presentations are stored refrigerated between 2 and 8 degrees Celsius and must not be frozen. Product labelling generally permits a limited period at controlled room temperature once dispensed, with the exact window depending on the presentation. Repeated temperature cycling is avoided because it can promote aggregation or deamidation of the peptide chain.
Identity and purity are assessed by reversed-phase high-performance liquid chromatography, with mass confirmation by electrospray ionisation mass spectrometry. Peptide mapping after enzymatic digestion verifies the primary sequence. Size-exclusion chromatography quantifies aggregates, while circular dichroism provides a secondary-structure fingerprint. Bioanalytical quantification in plasma uses immunoassay or LC-MS/MS. Reported purity for research-grade lots is commonly 95 percent or higher, and residual water content is checked by Karl Fischer titration.
As a peptide, tirzepatide is handled as a lyophilised solid in research settings and as a preserved solution in finished products. Aqueous solubility is pH dependent and reaches a minimum near the isoelectric point, which lies close to pH 5.4. Stock solutions are typically prepared in neutral or slightly basic buffer to limit precipitation. The solid is hygroscopic and should be equilibrated to room temperature before opening so that condensation does not form on the powder surface.
After the death of Ferdinand I in 1825 and the brief reign of his son Francis I, 20-year-old Ferdinand II (son of Francis I) ascended the throne in 1830. He enacted partial economic and administrative reforms:
== Research == A systematic review and metanalysis of cagrisema, published in 2024, found that cagrisema may provide weight loss benefits. Novo Nordisk announced late at the 2025 European Association for the Study of Diabetes (EASD) annual meeting that in the REDEFINE 1 study, cagrilintide provided clinically significant weight loss, with a mean reduction in body weight of 11.8% compared to 2.3% with placebo after 68 weeks, considering adherence of all participants to treatment. In addition, approximately 1 in 3 participants (31.6%) who received cagrilintide achieved a weight loss ≥15%, compared to approximately 1 in 20 participants (4.7%) who received placebo.
=== Skeletal muscle === In 1998, skeletal muscle was identified as an endocrine organ due to its now well-established role in the secretion of myokines. The use of the term myokine to describe cytokines and other peptides produced by muscle as signalling molecules was proposed in 2003.
The Tsitsin Main Botanical Garden of Academy of Sciences, founded in 1945, is the largest in Europe. This garden covers 3.61 square kilometers (1.39 sq mi) next to the All-Russia Exhibition Center; it contains a live exhibition of more than 20,000 species of plants from around the world, as well as a lab for scientific research. The garden contains a rosarium (with 20,000 rose bushes), a dendrarium, and an oak forest (whose average tree age exceeds 100 years). In addition, the garden contains a greenhouse occupying more than 5,000 square meters (53,820 square feet). The All-Russian Exhibition Center (Russian: Всероссийский выставочный центр) was formerly known as the All-Union Agricultural Exhibition (VSKhV) and later the Exhibition of Achievements of the National Economy (VDNKh), though it was officially called a "permanent trade show". This center is a prominent example of Stalinist-era monumental architecture. In this large recreational park, there are scores of pavilions, each representing one of two things: a branch of Soviet industry and science, or a Soviet republic. During the 1990s, the center was—and to some extent still is—misused as a shopping center. (Most pavilions are rented to small businesses.) Nevertheless, the center retains most of its architectural landmarks, including two monumental fountains (Stone Flower and Friendship of Nations) and a 360-degree panoramic cinema. In 2014, the park reverted to the name Exhibition of Achievements of National Economy; that same year, a large renovation project was started.
=== Exercise and muscle soreness === A 2017 review showed that taking antioxidant dietary supplements before or after exercise is unlikely to produce a noticeable reduction in muscle soreness after a person exercises.
Sources: en.wikipedia.org
Until the Renaissance, the vast majority of drugs in Western medicine were plant-derived extracts. This has resulted in a pool of information about the potential of plant species as important sources of starting materials for drug discovery. Botanical knowledge about different metabolites and hormones that are produced in different anatomical parts of the plant (e.g. roots, leaves, and flowers) are crucial for correctly identifying bioactive and pharmacological plant properties. Identifying new drugs and getting them approved for market has proved to be a stringent process due to regulations set by national drug regulatory agencies.
S. aureus: 0.25 μg/mL to 4.0 μg/mL S. aureus (methicillin resistant or MRSA): 1 μg/mL to 138 μg/mL S. epidermidis: ≤0.12 μg/mL to 6.25 μg/mL Although once described as narrow-spectrum, numerous studies have now shown that vancomycin decreases the levels of a wide spectrum of bacteria, including members of the Gram-negative Bacteroidota that are important in the human gut.
== Activation == All MMPs are synthesized in the latent form (Zymogen). They are secreted as proenzymes and require extracellular activation. They can be activated in vitro by many mechanisms including organomercurials, chaotropic agents, and other proteases.
CoviVac – COVID vaccine Cytestrol acetate – antiestrogen, cytostatic antineoplastic agent Deltaran (delta sleep-inducing peptide) – alcohol withdrawal treatment Dilept (GZR-123) – antipsychotic, neurotensin analogue Diucifon – leprostatic agent Emoxypine (Mexidol; Mexifin) – actoprotector, antioxidant EpiVacCorona – COVID vaccine Eprobemide (Befol) – antidepressant, reversible inhibitor of monoamine oxidase A Ethacizine (ethacyzine; Ethacizin) – antiarrhythmic agent Fabomotizole (Afobazole) – anxiolytic Feprosidnine (Sydnophen) – amphetamine derivative, psychostimulant Fluacizine (Phtorazisin) – tricyclic antidepressant, phenothiazine Fluorothiazinone (CL-55; Ftortiazinon) – investigational antibiotic Fotretamine (Fotrin) – alkylating antineoplastic agent, immunosuppressant Gamofen (gamophen; amphetamine–GABA) – amphetamine derivative, GABATooltip γ-aminobutyric acid analogue, central agent, central depressant Gidazepam (hydazepam, hidazepam) – atypical benzodiazepine, anxiolytic, TSPOTooltip translocator protein agonist/ligand Gludantan (gludantane) – adamantane, antiparkinsonian agent, antidepressant Glufimet (RGPU-238; dimethyl 3-phenylglutamate) – GABATooltip γ-aminobutyric acid and phenibut analogue Glutaron (RGPU-135; neuroglutamine, neuroglutam; β-phenylglutamate; 3-phenylglutamate) – glutamate analogue, psychostimulant, antidepressant, anxiolytic, neuroprotective Hemantane (hymantane) – adamantane, antiparkinsonian agent Hopantenic acid (homopantothenic acid; N-pantoyl-GABA; Pantogam) – central depressant, GABATooltip γ-aminobutyric acid analogue Ipidacrine (Neiromidin) – acetylcholinesterase inhibitor Latrepirdine (dimebolin; Dimebon) – antihistamine, antiserotonergic, nootropic Mecigestone (pentarane B) – progestin Megestrol caproate (MGC) – progestin Meldonium (Mildronate) – anti-ischemia agent Menthyl isovalerate (validolum; Extravalerianic, Validol, Valofin, Menthoval) – anxiolytic Mesocarb (Sidnocarb, Sydnocarb, Synocarb) – amphetamine derivative, psychostimulant Methylphenatine – amphetamine derivative, psychostimulant Methylphenylpiracetam – racetam, sigma σ1 receptor positive allosteric modulator α-Methyltryptamine (αMT; Indopan) – tryptamine derivative, antidepressant Metralindole (Inkazan) – antidepressant, reversible inhibitor of monoamine oxidase A Moracizine (moricizine; Ethmozine) – antiarrhythmic agent Nooglutyl (Nooglutil; N-5-hydroxynicotinoyl-L-glutamate) – nootropic Orenetide (BP101; Libicore; Desirix; Thr-Lys-Pro-Arg-Pro) – investigational small peptide, sexual enhancer Pabofen (pabophen; amphetamine–PABA) – amphetamine derivative, antihypoxic agent Pentarane A (D'6-pentarane) – progestin Phemerazole (femerazol; 5-phenyl-3-methylpyrazole) – sedative, hypnotic, anticonvulsant, muscle relaxant, mammary stimulant Phenatine (phenatin; Fenatine; amphetamine–niacin; N-nicotinoylamphetamine) – amphetamine derivative, psychostimulant, hypotensive agent Phenazepam – benzodiazepine, anxiolytic, sedative, hypnotic Phenibut (β-phenyl-GABA; Anvifen, Fenibut, Noofen; Citrocard, RGPU-147) – central depressant, anxiolytic, GABATooltip γ-aminobutyric acid analogue, gabapentinoid N-Phenylacetyl-L-prolylglycine ethyl ester (omberacetam; Noopept) – nootropic, racetam, cyclic glycine-proline prodrug Phenylphenamine (phenylamphetamine) – amphetamine derivative Phenylpiracetam (fonturacetam; Phenotropil, Actitropil, Carphedon) – psychostimulant, nootropic, racetam Phenylpiracetam hydrazide (fonturacetam hydrazide) – anticonvulsant, racetam Picamilon (N-nicotinoyl-GABA, pycamilon, and pikamilon) – anxiolytic, GABATooltip γ-aminobutyric acid analogue Pipofezine (Azafen, Azaphen) – tricyclic antidepressant Pirlindole (Lifril, Pyrazidol) – antidepressant, reversible inhibitor of monoamine oxidase A, serotonin–norepinephrine reuptake inhibitor Polymethylsiloxane polyhydrate (PMSPH; methylsilicic acid hydrogel; Enterosgel) – enterosorbent Propylphenamine (propylamphetamine; possibly N-propylamphetamine) – amphetamine derivative Prospidium chloride (prospidine) – cytostatic, anti-inflammatory agent Pyridoxiphen (amphetamine–pyridoxine; pyridoxylamphetamine) – amphetamine derivative, sympatholytic, hypotensive agent Quifenadine (Phencarol, Fencarol) – antihistamine RGPU-95 (p-chlorophenylpiracetam) – antidepressant, anxiolytic, racetam RGPU-207 (cyclic GABA derivative) – GABATooltip γ-aminobutyric acid analogue, mitochondrial modulator, racetam RGPU-260 – GABATooltip γ-aminobutyric acid analogue, cardiac stimulant Riamilovir (Triazavirin) – antiviral RU-1205 – analgesic, kappa opioid receptor agonist Selank – tuftsin analogue, nootropic, anxiolytic Semax – ACTHTooltip adrenocorticotropic hormone fragment analogue, nootropic, neuroprotective, neurorestorative Sodium polydihydroxyphenylene thiosulfonate (Hypoxen) – antihypoxic agent Sputnik Light – COVID vaccine Sputnik V – COVID vaccine Sulfozinum (sulfazin) – pyrogenic and pain-inducing agent used in psychiatry, for instance psychosis Temgicoluril (tetramethylglycoluril; Adaptol, Mebicar, Mebicarum, Mebikar) – anxiolytic Testifenon (testiphenon, testiphenone, chlorphenacyl dihydrotestosterone ester) – androgen/anabolic steroid, cytostatic antineoplastic agent Tetrindole – antidepressant, reversible inhibitor of monoamine oxidase A Thiophenatine (N-thionicotinoylamphetamine) – amphetamine derivative Tipindole – serotonin antagonist and monoamine oxidase inhibitor Tolibut (β-(4-methylphenyl)-GABA)) – anxiolytic, analgesic, neuroprotective, GABATooltip γ-aminobutyric acid and phenibut analogue Traneurocin (cycloprolylglycine; CPG; NA-831) – racetam-like neuroprotective, neurogenic, nootropic, and anxiolytic Trimeperidine – opioid analgesic Umifenovir (Arbidol) – antiviral Vishnevsky liniment – topical wound medication Phenamine (Fenamin), a psychostimulant, is not specifically a Russian drug but is rather the Russian name for amphetamine.
=== Sludges and fecal materials from sanitation processes === In the area of sanitation, drying of sewage sludge from sewage treatment plants, fecal sludge or feces collected in urine-diverting dry toilets (UDDT) is a common method to achieve pathogen kill, as pathogens can only tolerate a certain dryness level. In addition, drying is required as a process step if the excreta based materials are meant to be incinerated.
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 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.