If you have been reading about somatotroph and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Regulatory approval in the United States came in 2010, when the Food and Drug Administration cleared the peptide for the reduction of excess abdominal fat in adults with HIV infection and associated lipodystrophy. The decision rested mainly on two randomized phase 3 trials that enrolled roughly eight hundred patients and ran for twenty-six weeks. Participants receiving active drug showed substantially greater declines in visceral adipose tissue than those receiving placebo, while total body weight changed comparatively little. A reformulated presentation was later approved, and the product has remained a niche therapy rather than a general weight-loss agent.
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。
特沙莫瑞林是一种合成肽，其序列与人生长激素释放激素的 44 个氨基酸形式相关。它在 N 端带有反式-3-己烯酰基修饰，这一改动可减缓二肽基肽酶 IV 的降解。该化合物属于生长激素释放激素受体激动剂，可刺激垂体释放生长激素。研究文献通常将其归入合成肽类药物，而非小分子化合物。
| Property | Value | Notes |
|---|---|---|
| Peptide class | Synthetic GHRH analogue | 44 residues; N-terminal trans-3-hexenoyl group |
| First approval year | 2010 | United States; HIV-associated abdominal fat accumulation |
| Administration route | Subcutaneous injection | Abdominal site; clinician-administered or self-injected |
| Common synonyms | TH9507; tesamorelin acetate | Development code and acetate salt form |
| Originator | Canadian biotechnology firm | Original developer and regulatory sponsor |
Tesamorelin is a synthetic peptide that belongs to the growth hormone-releasing hormone (GHRH) family. Its sequence corresponds to the fully active 44-amino-acid form of human GHRH, with a single structural modification: the addition of a trans-3-hexenoyl group at the N-terminus. That modification is not found in the naturally occurring hormone and was introduced deliberately during development to improve stability against enzymatic degradation. The compound is therefore best described as a stabilized analogue rather than a naturally occurring peptide.
The native hormone is produced in the hypothalamus and acts on the anterior pituitary. Binding of GHRH to its receptor stimulates synthesis and release of growth hormone into circulation. Because the analogue retains the receptor-binding region of the parent sequence, it engages the same receptor and triggers the same downstream signaling. The result is increased growth hormone secretion from pituitary cells, which in turn influences hepatic production of insulin-like growth factor 1. This axis is the basis for the compound's measured biological effects.
Interest in this peptide developed because native GHRH has a short circulating lifetime. The N-terminal modification slows cleavage by dipeptidyl peptidase IV, an enzyme that removes the first two residues of many peptides and terminates their activity. Slower degradation means a longer window of receptor stimulation per administration. This design logic parallels other modified peptide hormones, where a small chemical change at a vulnerable site yields a more durable molecule without altering the core mechanism of action.
The hexenoyl cap slows the enzyme step that trims the amino terminus of native GHRH, the same step that shortens its active lifetime in circulation. As a result, the modified peptide persists longer in plasma than the unmodified hormone in side-by-side comparison. Receptor activity stays broadly comparable, because the added group sits away from the residues that contact the binding site. This combination, preserved receptor activity with reduced degradation, explains why the analog was developed instead of the native sequence.
Several compounds share the GHRH framework, including sermorelin, the shorter 1-29 fragment, and other analogs built on the full 1-44 chain. Naming follows a common convention: a stem that identifies the peptide plus a suffix marking analog status. Reports may describe tesamorelin by its sequence fragment, as a GHRH(1-44) analog, or by its amino-terminal modification. Indexing the compound therefore requires searching all of these forms, since some older literature predates the current international nonproprietary name.
Metabolic interest in this compound centers on fat distribution rather than on hormone levels alone. Imaging trials in adults with excess abdominal fat report reductions in visceral adipose tissue, while subcutaneous depots change comparatively little. Growth hormone and IGF-1 are presumed to carry the effect, but the separate contribution of each is not firmly established. Whether these changes persist after treatment stops, and whether they alter longer-term health outcomes, remain open questions that published work does not answer consistently.
Tesamorelin is a synthetic peptide of forty-four amino acids whose sequence reproduces human growth hormone-releasing hormone. Its distinguishing feature sits at the amino terminus, where a trans-3-hexenoyl group replaces the free amine. That acylation slows cleavage by dipeptidyl peptidase IV, an enzyme that otherwise removes the first two residues and inactivates the natural hormone quickly. The modified peptide therefore persists longer in circulation while keeping the same receptor target. It is handled as a lyophilized solid and dissolved shortly before use.
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.
C-terminus Also carboxyl terminus. The end of a linear chain of amino acids (i.e. a peptide) that is terminated by the free carboxyl group (–COOH) of the last amino acid to be added to the chain during translation. This amino acid is said to be C-terminal. By convention, sequences, domains, active sites, or any other structure positioned nearer to the C-terminus of the polypeptide or the folded protein it forms relative to others are described as downstream. Contrast N-terminus.
=== Genomic distribution === Distribution of stop codons within the genome of an organism is non-random and can correlate with GC-content. For example, the E. coli K-12 genome contains 2705 TAA (63%), 1257 TGA (29%), and 326 TAG (8%) stop codons (GC content 50.8%). Also the substrates for the stop codons release factor 1 or release factor 2 are strongly correlated to the abundance of stop codons. Large scale study of bacteria with a broad range of GC-contents shows that while the frequency of occurrence of TAA is negatively correlated to the GC-content and the frequency of occurrence of TGA is positively correlated to the GC-content, the frequency of occurrence of the TAG stop codon, which is often the minimally used stop codon in a genome, is not influenced by the GC-content.
=== Argentation chromatography === Ag+ binds alkenes reversibly, and silver nitrate has been used to separate mixtures of alkenes by selective absorption. This phenomenon is the basis of argentation chromatography. In some cases, alkene complexes can be isolated. The alkene can be liberated with ammonia.
=== Composition === Venom of the king cobra, produced by the postorbital venom glands, consists primarily of three-finger toxins (3FTx) and snake venom metalloproteinases (SVMPs). Of all the 3FTx, alpha-neurotoxins are the predominant and most lethal components when cytotoxins and beta-cardiotoxins also exhibit toxicological activities. It is reported that cytotoxicity of its venom varies significantly, depending upon the age and locality of an individual. Clinical cardiotoxicity is not widely observed, nor is nephrotoxicity present among patients bitten by this species, presumably due to the low abundance of the toxins. SVMPs are the second-most protein family isolated from the king cobra's venom, accounting from 11.9% to 24.4% of total venom proteins. The abundance is much higher than that of most cobras which is usually less than 1%. This protein family includes principal toxins responsible for vasculature damage and interference with haemostasis, contributing to bleeding and coagulopathy caused by envenomation of vipers. While there are such haemorrhagins isolated from the king cobra's venom, they only induce species-sensitive haemorrhagic and lethal activities on rabbits and hares, but with minimal effects on mice. Clinical pathophysiology of the king cobra's SVMPs has yet to be well studied, although its substantial quantity suggests involvement in tissue damage and necrosis as a result of inflammatory and proteolytic activities, which are instrumental for foraging and digestive purposes.
Sources: en.wikipedia.org
== Ceramic materials == The isoelectric points (IEP) of metal oxide ceramics are used extensively in material science in various aqueous processing steps (synthesis, modification, etc.). In the absence of chemisorbed or physisorbed species particle surfaces in aqueous suspension are generally assumed to be covered with surface hydroxyl species, M-OH (where M is a metal such as Al, Si, etc.). At pH values above the IEP, the predominant surface species is M-O−, while at pH values below the IEP, M-OH2+ species predominate. Some approximate values of common ceramics are listed below:
=== Histones === Daly was particularly interested in nuclear proteins. She developed methods for the fractionation of nuclear material and the determination of its composition. It was essential to separate cellular material into all of its components, without destroying or losing any of them. She studied histones, proteins found in cell nuclei, and was able to show the amino acid composition of various histone fractions. Her studies of histones with Mirsky provided evidence for lysine-rich histones, in contrast to the arginine-rich histones described by Albrecht Kossel. Histones have since been shown to be important in gene expression. Daly's work on histones is now considered fundamental.
In particular Jewish sympathy would confirm the support of American Jewry, and would make it more difficult for Germany to reduce her military commitments and improve her economic position on the eastern front". Two years later, in his Memoirs of the Peace Conference, Lloyd George described a total of nine factors motivating his decision as Prime Minister to release the declaration, including the additional reasons that a Jewish presence in Palestine would strengthen Britain's position on the Suez Canal and reinforce the route to their imperial dominion in India. These geopolitical calculations were debated and discussed in the following years. Historians agree that the British believed that expressing support would appeal to Jews in Germany and the United States, given two of Woodrow Wilson's closest advisors were known to be avid Zionists; they also hoped to encourage support from the large Jewish population in Russia. In addition, the British intended to pre-empt the expected French pressure for an international administration in Palestine. Some historians argue that the British government's decision reflected what James Gelvin, Professor of Middle Eastern History at UCLA, calls 'patrician anti-Semitism' in the overestimation of Jewish power in both the United States and Russia.
=== Fertilizer === Amino acids synthesized by living organisms such as methionine and cysteine contain organosulfur groups (thioester and thiol respectively). The antioxidant glutathione protecting many living organisms against free radicals and oxidative stress also contains organic sulfur. Some crops such as onion and garlic also produce different organosulfur compounds such as syn-propanethial-S-oxide responsible of lacrymal irritation (onions), or diallyl disulfide and allicin (garlic). Sulfates, commonly found in soils and groundwaters are often a sufficient natural source of sulfur for plants and bacteria. Atmospheric deposition of sulfur dioxide (SO2) is also a common artificial source (coal combustion) of sulfur for the soils. Under normal circumstances, in most agricultural soils, sulfur is not a limiting nutrient for plants and microorganisms (see Liebig's barrel). However, in some circumstances, soils can be depleted in sulfate, e.g. if this later is leached by meteoric water (rain) or if the requirements in sulfur for some types of crops are high. This explains that sulfur is increasingly recognized and used as a component of fertilizers. The most important form of sulfur for fertilizer is calcium sulfate, commonly found in nature as the mineral gypsum (CaSO4·2H2O). Elemental sulfur is hydrophobic (not soluble in water) and cannot be used directly by plants. Elemental sulfur (ES) is sometimes mixed with bentonite to amend depleted soils for crops with high requirement in organo-sulfur.
Molecular dimers are often formed by the reaction of two identical compounds e.g.: 2A → A−A. In this example, monomer "A" is said to dimerize to give the dimer "A−A". Dicyclopentadiene is an asymmetrical dimer of two cyclopentadiene molecules that have reacted in a Diels-Alder reaction to give the product. Upon heating, it "cracks" (undergoes a retro-Diels-Alder reaction) to give identical monomers:
Sources: en.wikipedia.org
== Expansion == Between 1993 and 1995 five new establishments were opened, and today it has a total of 72 restaurants; 63 in Madrid, 5 in Valencia, 2 in Barcelona, 2 in Sevilla, 1 in Toledo and 1 in Segovia. There is also at least one location in Malaga. In 1995, the company sold approximately 1.5 million sandwiches per month. Already controlled by the brewery Damm since 2012, the Grupo Rodilla was fully bought by Damm in 2015.
In 1990, the country had a Human Development Index of 0.920, placing it in the 'high' category of human development. It was the third-highest in the Eastern Bloc, behind Czechoslovakia and East Germany, and the 25th in the world of 130 countries.
Splenectomy (operative): This is the operative removal of the entire spleen by a surgeon, thus stopping the extravascular hemolysis, but also removing the immune functions that the spleen naturally provides to the body. Partial splenectomy (operative): This is when only a section of the spleen is removed, instead of the entire organ. The goal is to lower the extravascular hemolysis to a level compatible with homeostasis of the patient, while preserving the immune function of the spleen's presence. Research on outcomes is currently ongoing, and is routine at children's hospitals within the United States of America. Splenic ablation (interventional radiology): This option is non-operative, and is when an interventional radiologist (instead of a surgeon) uses radiologic techniques to coil or cauterize vasculature within the splenic circulation. There are various points in the circulatory pathway where the treatment can be applied to produces varying amounts of retained viability of the spleen, thus giving the option to attempt to preserve splenic immune function. All operative and interventional treatments require the immunization of HS patients against the influenza virus, SARS-CoV-2, and encapsulated bacteria such as Streptococcus pneumoniae and meningococcus. Antibiotics are no longer recommended for maintenance use, even in post-splenectomy HS patients. Since the spleen is important for protecting against encapsulated organisms, sepsis caused by encapsulated organisms is a possible complication of splenectomy. Additional elective treatments offered:
=== Catalysis === Metal carbonyls are used in a number of industrially important carbonylation reactions. In the oxo process, an alkene, hydrogen gas, and carbon monoxide react together with a catalyst (such as dicobalt octacarbonyl) to give aldehydes. Illustrative is the production of butyraldehyde from propylene:
Sources: en.wikipedia.org
It is a laboratory-made peptide of forty-four amino acids whose sequence matches human growth hormone-releasing hormone, with a modified amino terminus. The modification is a short unsaturated fatty acid chain attached to the first residue. This change slows enzymatic breakdown and lengthens the time the peptide stays active in circulation.
The clinical program was designed around HIV-associated lipodystrophy, a condition in which fat accumulates abnormally around the internal organs. Trials enrolled that specific population, so the evidence base covers it rather than the general population. Regulators approved the drug for the studied indication only, and promotion outside it is not permitted.
Growth hormone therapy supplies the finished hormone directly, while this peptide acts upstream and asks the pituitary to secrete its own. That difference means the response depends on a functioning pituitary and on the body's normal feedback loops. It also means the circulating hormone profile is pulsatile rather than a flat, injected level.
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。