hexenoyl group is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-09-27. Where a claim depends on a specific study, the study is described rather than over-claimed.
Development work on the compound, originally designated TH9507, focused on conditions in which reduced growth hormone signaling is thought to contribute to altered body composition. The United States Food and Drug Administration approved it in 2010 for the treatment of excess visceral abdominal fat in adults with human immunodeficiency virus infection and lipodystrophy. Later research examined other populations, including adults with mild cognitive impairment, where a large trial did not meet its primary endpoints. This mixed record illustrates how a single mechanism can produce clear effects in one setting and inconclusive results in another.
Several related peptides act on the same receptor, including sermorelin, a shorter GHRH fragment, and modified analogs such as CJC-1295 and modified GRF(1-29) that are common in research settings rather than approved products. Tesamorelin differs from growth hormone itself in that it acts upstream, prompting the pituitary to release the hormone through physiological signaling rather than supplying it directly. Terminology in the literature distinguishes GHRH analogs, growth hormone secretagogues, and recombinant growth hormone, although popular discussion often blurs these categories together. Precise naming matters when comparing study results.
Tesamorelin is a synthetic peptide of 44 amino acids that reproduces the sequence of human growth hormone-releasing hormone (GHRH) and carries a trans-3-hexenoyl group on its N-terminal tyrosine. That small fatty-acid modification blocks cleavage by dipeptidyl peptidase-4, the enzyme that rapidly degrades native GHRH in plasma. The result is a molecule with a longer circulating half-life than the natural hormone while retaining the same receptor target. It is supplied as a lyophilized powder for reconstitution and belongs to the broader class of GHRH analogs studied for effects on pituitary growth hormone secretion.
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 |
|---|---|---|
| Molecular class | Synthetic 44-residue GHRH analog | Sequence matches human GHRH(1-44); differs only at the N-terminus |
| Nominal molecular mass | Approximately 5,136 Da (free base) | Small variation arises from counterion and salt form |
| Appearance | White to off-white lyophilized powder | Supplied in single-use vials intended for reconstitution |
| Solubility class | Freely soluble in water | Practically insoluble in nonpolar organic solvents |
| Typical storage | 2 to 8 degrees Celsius, protected from light | Reconstituted material is handled according to label instructions |
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 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.
Signaling begins at the GHRH receptor, a class B G protein-coupled receptor displayed on somatotroph cells of the anterior pituitary. Receptor occupancy activates Gs proteins, which raise adenylyl cyclase activity and intracellular cyclic AMP, in turn driving protein kinase A dependent pathways. The downstream output is synthesis and pulsatile secretion of growth hormone into the bloodstream. Hepatic tissue and peripheral sites respond by increasing insulin-like growth factor 1 production. Somatostatin and IGF-1 itself supply negative feedback that caps the size and duration of each secretory burst.
In the Peninsular War, Arthur Wellesley, 1st Duke of Wellington, renewed the Anglo-Portuguese advance into Spain just after New Year in 1812, besieging and capturing the fortified towns of Ciudad Rodrigo, Badajoz, and crushing a French army at the Battle of Salamanca. As the French regrouped, the Anglo-Portuguese entered Madrid and advanced towards Burgos, before retreating all the way to Portugal when renewed French concentrations threatened to trap them. As a consequence of the Salamanca campaign, the French were forced to end their long siege of Cádiz and to permanently evacuate the provinces of Andalusia and Asturias. In a strategic move, Wellesley planned to move his supply base from Lisbon to Santander. The Anglo-Portuguese forces swept northwards in late May and seized Burgos. On 21 June, at Vitoria, the combined Anglo-Portuguese and Spanish armies won against Joseph Bonaparte, finally breaking French power in Spain. The French had to retreat from the Iberian peninsula, over the Pyrenees. The belligerents declared an armistice from 4 June 1813 (continuing until 13 August) during which time both sides attempted to recover from the loss of approximately a quarter of a million men in the preceding two months. During this time coalition negotiations finally brought Austria out in open opposition to France. Two principal Austrian armies took the field, adding 300,000 men to the coalition armies in Germany. The Allies now had around 800,000 front-line soldiers in the German theatre, with a strategic reserve of 350,000 formed to support the front-line operations.
In humans, evidence of a frameshift mutation in the bHLH domain of HAND1 has been correlated with hypoplastic left heart syndrome (a serious form of congenital heart disease where the left side of the heart is severely underdeveloped), aiding in the implication that HAND1 expression is a factor to patients with the disease. However, a lack of HAND1 in the distal regions of the Neural Crest has no effect on cranial feature formation. Mutation of HAND1 has been shown to hinder the effect of GATA4, another vital cardiac transcription factor, and is associated with congenital heart disease. The lack of HAND1 detection in the developing embryo leads to many of the structural defects that causes heart disease and facial deformities while the dosage of HAND1 relates to the severity of these maladies.
== Pharmacology == The pharmacology of 5α-reductase inhibition is complex, but involves the binding of NADPH to the enzyme followed by the substrate. Specific substrates include testosterone, progesterone, androstenedione, epitestosterone, cortisol, aldosterone, and deoxycorticosterone. The entire physiologic effect of their reduction is unknown, but likely related to their excretion or is itself physiologic. 5α-Reductase reduces the steroid Δ4,5 double bond in testosterone to its more active form DHT. Thus, inhibition results in decreased amounts of DHT. Because of this, slight elevations in testosterone and estradiol levels occur. The 5α-reductase reaction is a rate-limiting step in the testosterone reduction and involves the binding of NADPH to the enzyme followed by the substrate.
1970 Establishment of the International Food Irradiation Project (IFIP), headquarters at the Federal Research Centre for Food Preservation, Karlsruhe, Germany 1980 FAO/IAEA/WHO Joint Expert Committee on Food Irradiation recommends the clearance generally up to 10 kGy "overall average dose" 1981/1983 End of IFIP after reaching its goals 1983 Codex Alimentarius General Standard for Irradiated Foods: any food at a maximum "overall average dose" of 10 kGy 1984 International Consultative Group on Food Irradiation (ICGFI) becomes the successor of IFIP 1986 January People's Republic of China opens their first food irradiation facility in Shanghai 1994 India approves irradiation of spices, potato and onion. 1997 FAO/IAEA/WHO Joint Study Group on High-Dose Irradiation recommends to lift any upper dose limit 1998 The European Union's Scientific Committee on Food (SCF) voted in favour of eight categories of irradiation applications 1999 The European Union adopts Directives 1999/2/EC (framework Directive) and 1999/3/EC (implementing Directive) limiting irradiation a positive list whose sole content is one of the eight categories approved by the SCF, but allowing the individual states to give clearances for any food previously approved by the SCF. 2000 Germany leads a veto on a measure to provide a final draft for the positive list. 2003 Codex Alimentarius General Standard for Irradiated Foods: no longer any upper dose limit 2003 The SCF adopts a "revised opinion" that recommends against the cancellation of the upper dose limit.
At atmospheric levels of ambient CO2 the table indicates that the solution will be slightly alkaline with a maximum CaCO3 solubility of 47 mg/L. As ambient CO2 partial pressure is reduced below atmospheric levels, the solution becomes more and more alkaline. At extremely low PCO2, dissolved CO2, bicarbonate ion, and carbonate ion largely evaporate from the solution, leaving a highly alkaline solution of calcium hydroxide, which is more soluble than CaCO3. For PCO2 = 10−12 atm, the [Ca2+][OH−]2 product is still below the solubility product of Ca(OH)2 (8×10−6). For still lower CO2 pressure, Ca(OH)2 precipitation will occur before CaCO3 precipitation. As ambient CO2 partial pressure increases to levels above atmospheric, pH drops, and much of the carbonate ion is converted to bicarbonate ion, which results in higher solubility of Ca2+. The effect of the latter is especially evident in day-to-day life of people who have hard water. Water in aquifers underground can be exposed to levels of CO2 much higher than atmospheric. As such, water percolates through calcium carbonate rock, the CaCO3 dissolves according to one of the trends above. When that same water then emerges from the tap, in time, it comes into equilibrium with CO2 levels in the air by outgassing its excess CO2. The calcium carbonate becomes less soluble as a result, and the excess precipitates as lime scale. This same process is responsible for the formation of stalactites and stalagmites in limestone caves.
Sources: en.wikipedia.org
=== Complications === A number of complications may occur from cholecystitis if not detected early or properly treated. Signs of complications include high fever, shock and jaundice. Complications include the following:
Gas: Volatile vapors often used for fuel. Charcoal: The solid carbon residue remaining in the kiln. Liquid distillate: The condensed vapors that form the basis for further refinement. Separation of the liquid: The liquid distillate naturally separates (or is processed) into two distinct layers:
== Safety == Vacuum flasks are at risk of implosion hazard, and glass vessels under vacuum, in particular, may shatter unexpectedly. Chips, scratches or cracks can be a starting point for dangerous vessel failure, especially when the vessel temperature changes rapidly (when hot or cold liquid is added). Proper preparation of the Dewar vacuum flask by tempering prior to use is advised to maintain and optimize the functioning of the unit. Glass vacuum flasks are usually fitted into a metal base with the cylinder contained in or coated with mesh, aluminum or plastic to aid in handling, protect it from physical damage, and contain fragments should they break. In addition, cryogenic storage dewars are usually pressurized, and they may explode if pressure relief valves are not used. Thermal expansion has to be taken into account when engineering a vacuum flask. The outer and inner walls are exposed to different temperatures and will expand at different rates. The vacuum flask can rupture due to the differential in thermal expansion between the outer and inner walls. Expansion joints are commonly used in tubular vacuum flasks to avoid rupture and maintain vacuum integrity.
Aam papad – a mango Ancho chili – the dried form of poblano chili. Apple chips Dried apple – can be eaten dried or reconstituted (soaked in water, alcohol or some other liquid) for later use. Dried apricot – can be dried either whole or in halves, with or without kernels.
Sources: en.wikipedia.org
It is a synthetic peptide built from 44 amino acids arranged in the same order as human growth hormone-releasing hormone. A short fatty-acid chain, described as a trans-3-hexenoyl group, is attached to the first amino acid. The finished molecule is formulated as a sterile powder that is dissolved before use.
No. It is a releasing-factor analog that signals the pituitary gland to secrete growth hormone, whereas recombinant growth hormone is the hormone itself administered directly. The two are chemically distinct and act at different points in the same endocrine pathway. This distinction is often lost in informal discussion.
Native growth hormone-releasing hormone is broken down within minutes by dipeptidyl peptidase-4 in the bloodstream. Adding the hexenoyl group at the N-terminus shields the peptide from that enzyme. The modification does not change the receptor it targets, only how long the peptide survives in circulation.
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。