The short version of 垂体受体 fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-01-05 and is reviewed periodically as new material appears.
Clinical study of tesamorelin has centered on adults with HIV-associated lipodystrophy, a condition in which abdominal fat accumulates while peripheral fat is lost. In controlled trials, treated participants showed reductions in visceral adipose tissue measured by imaging, alongside modest shifts in some lipid values. Effects on subcutaneous fat were smaller and less consistent across studies. Whether these changes translate into fewer cardiovascular events remains an open question, because the trials were not designed or powered to answer it.
Tesamorelin is a synthetic peptide that acts as an analog of growth hormone-releasing hormone, a natural hypothalamic signal. Its sequence corresponds to the forty-four amino acid form of the human hormone, with a small acyl group attached near the amino terminus. That modification slows enzymatic breakdown and extends the time the peptide remains active in circulation. The compound was developed as a pharmacological way to raise endogenous growth hormone output rather than supplying the hormone directly.
监管记录显示，特沙莫瑞林于 2010 年在美国首次获得批准，用于人类免疫缺陷病毒感染相关的脂肪营养不良患者。批准依据来自降低内脏脂肪的临床试验，而非体重或瘦体重的普遍改善。后续出现了不同制剂版本，但其核心适应症保持一致。关于长期心血管结局和死亡率影响，现有证据仍不充分。
在临床研究之外，特沙莫瑞林常被讨论为生长激素分泌促进剂，但这一说法需要限定。它并不等同于生长激素本身，也不属于普通减重药物。部分研究关注其减少腹部脂肪和改善脂质谱的潜力，另一些研究则关注胰岛素抵抗和 IGF-1 升高等信号。这些效应的临床意义仍在评估中，尚未形成统一结论。
| Property | Value | Notes |
|---|---|---|
| Drug class | Peptide hormone analog | Acts at the growth hormone-releasing hormone receptor |
| Receptor | Growth hormone-releasing hormone receptor | G protein-coupled; raises cyclic AMP in somatotrophs |
| Key mediator | Insulin-like growth factor 1 | Increases with repeated administration |
| Main studied population | Adults with HIV-associated lipodystrophy | Trials measured visceral adipose tissue by imaging |
| Route | Subcutaneous injection | Given once daily in clinical use |
Physicochemical behavior is dominated by the peptide backbone. The molecule is hydrophilic and carries a net positive charge near neutral pH, owing to several arginine and lysine residues. In solution it adopts a largely unstructured conformation, and aggregation is a known concern for peptide products of this size. Oxidation of methionine and deamidation of asparagine or glutamine residues are the principal chemical degradation routes. These liabilities shape how the material is formulated, handled, and analyzed, and they explain why lyophilized presentations are common in research settings.
Tesamorelin is a synthetic peptide analog of growth hormone-releasing hormone, built from 44 amino acids. Its sequence follows the natural human GHRH(1-44) backbone, with a trans-3-hexenoyl group attached to the N-terminal tyrosine. This modification blocks recognition by dipeptidyl peptidase IV, the enzyme that rapidly truncates the native hormone in circulation. The result is a molecule with a substantially longer plasma residence time than unmodified GHRH, which makes it practical for clinical and laboratory study.
Tesamorelin occupies a narrow position among agents that act on the growth hormone axis. Unlike growth hormone itself, which is given as replacement, it stimulates the pituitary to release the hormone in pulses, so the downstream increase in insulin-like growth factor 1 depends on intact somatotroph function. Other peptides in the same family include shorter GHRH fragments and synthetic secretagogues with different stability profiles. Several points remain unresolved, including whether the reduction in visceral fat translates into fewer cardiovascular events, what happens to metabolic markers after long-term use, and how the drug compares with lifestyle or surgical approaches.
Tesamorelin is a synthetic peptide that belongs to the growth hormone-releasing hormone family and contains the same forty-four amino acid sequence as endogenous GHRH, extended at the amino terminus by a trans-3-hexenoyl group. That small fatty acid modification protects the peptide from rapid cleavage by dipeptidyl peptidase-4, the enzyme that shortens the half-life of native GHRH to only a few minutes. Chemically the compound is produced by solid-phase peptide synthesis, purified by chromatography, and supplied as a sterile lyophilized powder for reconstitution.
作用位置在垂体前叶。tesamorelin 与 GHRH 受体结合后激活腺苷酸环化酶，升高细胞内 cAMP，再经蛋白激酶 A 通路促进生长激素的合成与释放。由于它作用于内源调控节点，生长激素仍以脉冲方式分泌，而不是被持续抬升到固定水平。生长激素随后在肝脏等组织诱导胰岛素样生长因子 1 产生，构成完整的生长激素轴响应。
研究背景集中在特定人群的体成分改变，尤其是与脂肪分布异常相关的内脏脂肪堆积。不同地区对它的监管状态与获批适应症并不一致，部分市场仅限特定诊断人群使用。在一般人群中的长期效应、与其他激素的相互作用以及停药后的维持情况仍属开放问题，现有数据不足以给出普遍结论。
tesamorelin 是一种人工合成的四十四肽，序列与内源性生长激素释放激素（GHRH）的 1-44 片段一致，区别在于 N 端加接了一个反式-3-己烯酰基。该修饰抑制二肽基肽酶 IV 的快速切割，从而延长分子在循环中的存留时间。作为肽类分子，它难以经胃肠道吸收，文献中讨论的均是注射途径。分类上通常把它归为 GHRH 类似物，以区别于生长激素本身。
Clinical investigation has focused on HIV-associated lipodystrophy, a condition in which antiretroviral therapy contributes to abnormal fat distribution. Excess visceral adipose tissue accumulates in the abdomen while peripheral fat may be lost. Tesamorelin was evaluated for reducing this visceral fat depot, with trials measuring changes in abdominal fat by imaging rather than by body weight alone. The rationale rests on the known lipolytic effects of growth hormone. Effects on visceral fat are documented, while long-term outcomes regarding cardiovascular risk remain less clearly established.
Tesamorelin is a synthetic peptide analog of growth hormone-releasing hormone, composed of 44 amino acids. It was designed to retain the biological activity of the native hormone while resisting rapid enzymatic degradation. The compound is classified as a growth hormone secretagogue and belongs to the broader family of hypothalamic releasing factors. In research and clinical settings, it is studied for its ability to stimulate pituitary growth hormone release. Its structure includes a modification at the N-terminus that contributes to an extended half-life relative to native growth hormone-releasing hormone.
Pyruvic acid (CH3COCOOH) is the simplest of the alpha-keto acids, with a carboxylic acid and a ketone functional group. Pyruvate, the conjugate base, CH3COCOO−, is an intermediate in several metabolic pathways throughout the cell. Pyruvic acid can be made from glucose through glycolysis, converted back to carbohydrates (such as glucose) via gluconeogenesis, or converted to fatty acids through a reaction via acetyl-CoA. It can also be used to construct the amino acid alanine and can be converted into ethanol or lactic acid via fermentation. Pyruvic acid supplies energy to cells through the citric acid cycle (also known as the Krebs cycle) when oxygen is present (aerobic respiration), and alternatively ferments to produce lactate when oxygen is lacking.
==== Estate tax, gift tax, and generation-skipping transfer tax ==== The estate, gift, and generation-skipping transfer tax exemption will increase from $13.99 million in 2025 to $15 million in 2026. The exemption amounts for subsequent years will be indexed for inflation.
In July 2023, TikTok launched a new streaming service called TikTok Music. This service allowed users to listen to, download and share songs. After a dispute with TikTok regarding payouts for artists and regulation of AI-generated music content on the platform, Universal Music Group decided not to renew its licensing agreement, causing its catalogue of 3 million recordings to become unavailable for usage after 2024. This marked the company's first instance of withdrawing its music from a major platform, in contrast to Warner Music, which had recently renewed its own licensing deal with TikTok. In March 2024, Universal Music Publishing Group removed its catalogue of 4 million compositions from TikTok. In April 2024, Taylor Swift's music returned to the platform. TikTok Music was discontinued in November 2024. In December 2025, TikTok launched digital gift cards. In February 2026, TikTok launched Local Feed, a feature intended to help users connect with their community and discover local events and updates. In June 2026, TikTok launched Agentic Hub, a platform that integrates third-party AI applications with its advertising system to support campaign creation, management, and performance evaluation. In July 2026, TikTok introduced new AI literacy measures, including educational guides and enhanced content transparency tools, to help users recognize AI-generated content. In August 2026, TikTok introduced a legacy account setting that allows users to decide what happens to their account after their death.
A selenenic acid is an organoselenium compound and an oxoacid with the general formula RSeOH, where R ≠ H. It is the first member of the family of organoselenium oxoacids, which also include seleninic acids and selenonic acids, which are RSeO2H and RSeO3H, respectively. Selenenic acids derived from selenoenzymes are thought to be responsible for the antioxidant activity of these enzymes. This functional group is called SeO-selenoperoxol in recent nomenclature.
Sources: en.wikipedia.org
Some statins, including atorvastatin (Lipitor), lovastatin (Mevacor), and simvastatin (Zocor, Simlup, Simcor, Simvacor) In contrast, pravastatin (Pravachol), fluvastatin (Lescol), and rosuvastatin (Crestor) are unaffected by grapefruit. Anti-arrhythmics including amiodarone (Cordarone), dronedarone (Multaq), quinidine (Quinidex, Cardioquin, Quinora), disopyramide (Norpace), propafenone (Rythmol) and carvedilol (Coreg) Amlodipine: Grapefruit increases the available amount of the drug in the blood stream, leading to an unpredictable increase in antihypertensive effects. Anti-migraine drugs ergotamine (Cafergot, Ergomar), amitriptyline (Elavil, Endep, Vanatrip) and nimodipine (Nimotop) Erectile dysfunction drugs sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra) Acetaminophen (also known as paracetamol, brand name Tylenol) concentrations increase in the blood of mice when they consume white and pink grapefruit juice, with the white juice acting faster. "The bioavailability of paracetamol was significantly reduced following multiple GFJ administration" in mice and rats. This suggests that repeated intake of grapefruit juice reduces the efficacy and bioavailability of acetaminophen/paracetamol in comparison with a single dose of grapefruit juice, which conversely increases the efficacy and bioavailability of acetaminophen/paracetamol.
Quaternary structure is the three-dimensional structure consisting of the aggregation of two or more individual polypeptide chains (subunits) that operate as a single functional unit (multimer). The resulting multimer is stabilized by the same non-covalent interactions and disulfide bonds as in tertiary structure. There are many possible quaternary structure organisations. Complexes of two or more polypeptides (i.e. multiple subunits) are called multimers. Specifically it would be called a dimer if it contains two subunits, a trimer if it contains three subunits, a tetramer if it contains four subunits, and a pentamer if it contains five subunits, and so forth. The subunits are frequently related to one another by symmetry operations, such as a 2-fold axis in a dimer. Multimers made up of identical subunits are referred to with a prefix of "homo-" and those made up of different subunits are referred to with a prefix of "hetero-", for example, a heterotetramer, such as the two alpha and two beta chains of hemoglobin.
== Signs and symptoms == Diabetic hypoglycemia can be mild, recognized easily by the patient, and reversed with a small amount of carbohydrates eaten or drunk, or it may be severe enough to cause unconsciousness requiring intravenous dextrose or an injection of glucagon. Severe hypoglycemic unconsciousness is one form of diabetic coma. A common medical definition of severe hypoglycemia is "hypoglycemia severe enough that the person needs assistance in dealing with it". A co-morbidity is the issue of hypoglycemia unawareness. Symptoms of diabetic hypoglycemia, when they occur, are those of hypoglycemia: neuroglycopenic, adrenergic (that is, activating adrenergic receptors, resulting e.g. in fast heartbeat), and abdominal. Symptoms and effects can be mild, moderate or severe, depending on how low the glucose falls and a variety of other factors. It is rare but possible for diabetic hypoglycemia to result in brain damage or death. Indeed, an estimated 2–4% of deaths of people with type 1 diabetes mellitus have been attributed to hypoglycemia. In North America a mild episode of diabetic hypoglycemia is sometimes termed a "low" or an "insulin reaction," and in Europe a "hypo", although all of these terms are occasionally used interchangeably in North America, Europe, Australia and New Zealand. A severe episode is sometimes also referred to as "insulin shock". In a counter-intuitive manifestation, hypoglycemia can trigger a Somogyi effect, resulting in a rebounding high blood sugar or hyperglycemia.
In 2009, the PLA held its first military exercise in Africa, a humanitarian and medical training practice conducted in Gabon. For the past 10 to 20 years, the PLA has acquired some advanced weapons systems from Russia, including Sovremenny-class destroyers, Sukhoi Su-27 and Kilo-class diesel-electric submarines. It has also started to produce several new classes of destroyers and frigates including the Type 052D class guided-missile destroyer. In addition, the PLAAF has designed its very own Chengdu J-10 fighter aircraft and a new stealth fighter, the Chengdu J-20. The PLA launched the new Jin class nuclear submarines on 3 December 2004 capable of launching nuclear warheads that could strike targets across the Pacific Ocean and have three aircraft carriers, with the latest, the Fujian, launched in 2022. From 2014 to 2015, the PLA deployed 524 medical staff on a rotational basis to combat the Ebola virus outbreak in Liberia, Sierra Leone, Guinea, and Guinea-Bissau. As of 2023, this was the PLA's largest medical assistance mission in another country. China re-organized its military from 2015 to 2016. In 2015, the PLA formed new units including the PLA Ground Force, the PLA Rocket Force, and the PLA Strategic Support Force. In 2016, the CMC replaced the four traditional military departments with a number of new bodies. China replaced its system of seven military regions with newly established Theater Commands: Northern, Southern, Western, Eastern, and Central. In the prior system, operations were segmented by military branch and region.
== Human proteins containing this domain == EEF1E1; EEF1G; GDAP1; GSTA1; GSTA2; GSTA3; GSTA4; GSTA5; GSTM1; GSTM2; GSTM3; GSTM4; GSTM5; GSTO1; GSTP1; GSTT1; GSTT2; GSTZ1; MARS; HPGDS; PTGDS2; PTGES2; VARS;
Sources: en.wikipedia.org
== Cytotoxics and targeted therapies == Targeted therapies are a relatively new class of cancer drugs that can work to overcome many of the adverse effects seen with the use of cytotoxics. They are divided into two groups: small molecule and antibodies. The typical widespread toxicity observed with the use of cytotoxics is due to the lack of cell specificity of the drugs allowing them to kill any rapidly dividing cell, both cancerous and normal. Targeted therapies however, are designed to affect cellular proteins or processes that are utilized by the cancer cells. This allows a high dose administration to cancer tissues with a relatively low dose to other tissues. Although the side effects are often less severe than that seen of cytotoxic chemotherapeutics, life-threatening effects can occur. Initially, the targeted therapeutics were supposed to be solely selective for one protein. Now it is clear that there is often a range of protein targets that the drug can bind. An example target for targeted therapy is the BCR-ABL1 protein produced from the Philadelphia chromosome, a genetic lesion found commonly in chronic myelogenous leukemia and in some patients with acute lymphoblastic leukemia. This fusion protein has enzyme activity that can be inhibited by imatinib, a small molecule drug. Another example of target therapy is fludarabine cyclophosphamide (FC) lymphodepletion therapy used in patients with B cell lymphoma. This anti-CD19 CAR-T cell therapy is commonly known to decrease CAR-T cells which bind to the glycoprotein CD19.
Their global total production value of $85 billion is split about 60-40 between in-house production in the life-science industry—the products' main consumers—and companies producing them for sale. The latter pursue both a "supply push" strategy, whereby standard products are developed in-house and offered ubiquitously, and a "demand pull" strategy, whereby products or services determined by the customer are provided exclusively on a "one customer / one supplier" basis. The products are mainly used as building blocks for proprietary products. The hardware of the top tier fine chemical companies has become almost identical: the design, lay-out and equipment of the plants and laboratories have become practically the same globally; most chemical reactions performed go back to the days of the dyestuff industry; and numerous regulations determine the way labs and plants must be operated, thereby contributing to the uniformity.
=== Pharmacodynamics === Oxprenolol is a beta blocker. In addition, it has been found to act as an antagonist of the serotonin 5-HT1A and 5-HT1B receptors with respective Ki values of 94.2 nM and 642 nM in rat brain tissue.
Hydroxynorketamine (HNK), or 6-hydroxynorketamine, is a minor metabolite of the anesthetic, dissociative, and antidepressant drug ketamine. It is formed by hydroxylation of the intermediate norketamine, another metabolite of ketamine. As of late 2019, (2R,6R)-HNK is in clinical trials for the treatment of depression. The major metabolite of ketamine is norketamine (80%). Norketamine is secondarily converted into 4-, 5-, and 6-hydroxynorketamines (15%), mainly HNK (6-hydroxynorketamine). Ketamine is also transformed into hydroxyketamine (5%). As such, bioactivated HNK comprises less than 15% of a dose of ketamine.
Promising innovations relating to global challenges are reported: LAION releases a first version of BUD-E, a fully open source voice assistant (8 Feb), Minesto's Dragon 12 underwater tidal kite turbines are demonstrated successfully, connected to the Faroe Island's power grid (11 Feb), rice grains as scaffolds containing cultured animal cells are demonstrated (14 Feb), an automatic waste sorting system (ZenRobotics 4.0) that can distinguish between over 500 waste categories is released (15 Feb), researchers describe an AI ecosystem interface of foundation models connected to many APIs as specialized subtask-solvers (16 Feb), precision fermentation-derived beta-lactoglobulin is released as a substitute for whey protein amid growth of a nascent animal-free dairy industry (19 Feb), researchers describe an approach for an optical disk with petabit capacity (21 Feb).
Sources: en.wikipedia.org
It is a laboratory-made peptide that mimics growth hormone-releasing hormone. It prompts the pituitary gland to release growth hormone and has been studied mainly in adults with HIV-associated lipodystrophy.
Administered growth hormone supplies the hormone directly, while this peptide acts upstream by prompting the pituitary to release it. The indirect route preserves pulsatile secretion and some endogenous feedback, which changes the hormone and IGF-1 profile observed after treatment.
Reductions in visceral adipose tissue appear consistently in randomized trials of the approved population. Effects on peripheral fat, cardiovascular outcomes, and use outside that population are less well established.
特沙莫瑞林是国际非专利名称，指一种经过 N 端修饰的生长激素释放激素类似物。它被归类为合成肽，序列与 GHRH(1-44) 密切相关。该名称不指代任何特定品牌或剂型。