A practical reference on prohibited list: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-02-21 and is reviewed periodically as new material appears.
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.
Lyophilized material is typically held under refrigeration between two and eight degrees Celsius, shielded from light and ambient moisture. Peptides of this size adsorb to glass and plastic, so working procedures often call for low-binding containers and as few transfers as possible. Absorbed water during weighing shifts the apparent mass of a sample, and controlling room humidity reduces that source of error. Once dissolved, solutions are kept cold and used within the interval printed on the accompanying label or certificate. Degradation accelerates markedly in dilute aqueous form.
Identity and purity are judged through a combination of chromatographic and mass spectrometric techniques. Reversed-phase high-performance liquid chromatography separates the intact peptide from truncated, oxidized, and deamidated variants, and the resulting peak-area percentages yield a purity figure. Electrospray ionization mass spectrometry confirms the expected molecular mass and can expose unanticipated modifications. Amino acid analysis and peptide mapping support sequence fidelity, while water content, pH, sterility, and bacterial endotoxin testing describe the physical and microbiological attributes of a finished lot.
Regulatory position depends on jurisdiction and on the form in which the material is sold. A branded product holds approval in the United States for a defined indication, and prescribing is confined to that label. Material marketed for laboratory research is not evaluated for human use and carries no such clearance. Independent verification therefore rests on certificates of analysis, third-party testing, and documented chain of custody. The substance also appears on the World Anti-Doping Agency prohibited list within the category covering growth hormone-releasing factors.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C221H366N72O67S | Reflects a 44-residue peptide with one N-terminal modification |
| Approximate molecular weight | 5136 Da | Sequence length and single acyl group determine the mass |
| Appearance | White to off-white lyophilized powder | Typical form of a purified synthetic peptide |
| Solubility class | Soluble in water and aqueous buffer | Peptide backbone favors aqueous dissolution |
| Common synonyms | GHRH(1-44) analogue; Egrifta | Descriptive name and approved brand name |
Tesamorelin is a synthetic analog of growth hormone-releasing hormone, a peptide hormone produced by the hypothalamus. The molecule retains the 44-amino-acid sequence of human GHRH and carries a trans-3-hexenoyl modification at its N-terminus. This modification increases resistance to enzymatic degradation and extends the peptide's functional stability relative to native GHRH. The compound is supplied as a lyophilized powder for reconstitution and subcutaneous administration in clinical settings. Its development code was TH9507, and it belongs to the GHRH analog class. It is not a growth hormone product; instead, it acts upstream to stimulate endogenous growth hormone release.
Clinical interest in tesamorelin arose from the need to address visceral adiposity in people living with HIV. Antiretroviral therapy improved survival but was associated in some patients with central fat accumulation, altered lipid profiles, and metabolic complications. This condition, often called HIV-associated lipodystrophy, involves excess visceral adipose tissue that is difficult to manage through diet and exercise alone. Investigators evaluated tesamorelin because GHRH analogs can stimulate growth hormone secretion and influence fat distribution without direct liposuction or invasive procedures.
A Phase 3 program led to regulatory approval in the United States in 2010 for reduction of excess visceral abdominal fat in adults with HIV and lipodystrophy. Subsequent studies examined effects on liver fat, muscle area, and metabolic markers, with mixed findings for some endpoints. Long-term cardiovascular outcomes and effects on mortality remain uncertain because most trials were relatively short and focused on imaging-based fat measurements. Use in populations without HIV has been studied experimentally but is not part of the approved indication.
纯度与身份确认依赖色谱与质谱的组合。反相高效液相色谱在 214 nm 紫外检测下分离主峰与相关杂质，给出纯度百分比与保留时间；电喷雾或基质辅助激光解吸电离质谱提供分子量，用于确认 N 端修饰是否完整。序列层面可通过肽图或氨基酸分析验证。含量测定常用紫外吸收法或氮元素分析，不同方法之间需要做交叉校验。
冻干粉末一般在 -20°C 或更低温度、干燥避光条件下保存，可维持较长时间的稳定。复溶后稳定性明显下降，溶液中的肽链易发生水解、氧化与聚集，通常需冷藏并在短期内用完。反复冻融会加速聚集与降解，建议分装后单次使用。缓冲体系的 pH 与离子强度同样影响聚集速率，需要按具体实验条件验证。
Only when the South Ossetians opened up with artillery on Georgian villages, did the offensive to take Tskhinvali begin." The cable also says, "All evidence available to the country team supports Saakashvili's statement that this fight was not Georgia's original intention. Key Georgian officials, who would have had responsibility for an attack on South Ossetia have been on leave, and the Georgians only began mobilizing August 7 once the attack was well underway." The cable reported, "Fighting had continued throughout the night of August 7, resuming four hours after President Saakashvili unilaterally declared a cease-fire at 1900." The cable noted, "Although most in the Georgian government believed that the fighting had started as a ploy of de facto leader Kokoity, Saakashvili was now concerned that this might have been a Russian pretext and a further attack could be expected." The cable also reported that "The Georgians believe the South Ossetians are targeting the Russians to provoke a bigger Georgian-Russian conflict" and named the person responsible for the escalation of the conflict, "One plausible explanation for all this is that de facto leader Kokoity decided to roll the dice and stimulate a conflict with the Georgians in hopes of bringing in the Russians and thereby saving himself or enhancing his position." The cable reported that Russia had launched 4 ballistic missiles against Tskhinvali. The cable reported that the Georgians were fighting with unidentified Russian combatants north of Tskhinvali.
== Effects against senescent cells == In animal studies, navitoclax was found to be a senolytic agent, inducing apoptosis in senescent, but not non-senescent cells. Oral administration of navitoclax (ABT-263) to either sublethally irradiated or normally aged mice reduced senescent cells, including senescent bone marrow hematopoietic stem cells and senescent muscle stem cells. This depletion mitigated total-body irradiation-induced premature aging of the hematopoietic system and rejuvenated the aged hematopoietic stem cells and muscle stem cells in normally aged mice. On September 19, 2018, an article was published in Nature about using navitoclax to kill senescent glial cells in mice. The drug had a protective effect against memory loss in mice genetically engineered to simulate Alzheimer's disease. On December 3, 2024, an article was published in Aging detailing a study investigating the effects of topical navitoclax (ABT-263) on aged mouse skin. It examined whether eliminating senescent cells could improve wound healing. In the study, 24-month-old mice were treated with topical navitoclax (ABT-263) for five days. The treatment reduced the expression of senescence markers p16 and p21 and decreased the number of SA-β-gal– and p21-positive cells compared with DMSO controls. Navitoclax (ABT-263) application also induced a transient inflammatory response and macrophage infiltration. Bulk RNA sequencing revealed upregulation of genes involved in wound-healing pathways, including inflammation, angiogenesis, collagen synthesis, and extracellular matrix remodeling.
=== Games about the Cold War === Twilight Struggle is a 2005 card-based board game by GMT Games that depicts the events of the entire Cold War, starting from Joseph Stalin to Ronald Reagan. The game was turned into a video game in 2016.
Sources: en.wikipedia.org
=== Hydrolysis === Amides hydrolyse in hot alkali as well as in strong acidic conditions. Acidic conditions yield the carboxylic acid and the ammonium ion while basic hydrolysis yield the carboxylate ion and ammonia. The protonation of the initially generated amine under acidic conditions and the deprotonation of the initially generated carboxylic acid under basic conditions render these processes non-catalytic and irreversible. Electrophiles other than protons react with the carbonyl oxygen. This step often precedes hydrolysis, which is catalyzed by both Brønsted acids and Lewis acids. Peptidase enzymes and some synthetic catalysts often operate by attachment of electrophiles to the carbonyl oxygen.
The equation displayed on the chart gives a means for calculating the absorbance and therefore concentration of the unknown samples. In Graph 1, x is concentration and y is absorbance, so one must rearrange the equation to solve for x and enter the absorbance of the measured unknown. It is likely that the unknown will have absorbance numbers outside the range of the standard. These should not be included calculations, as the equation given cannot apply to numbers outside of its limitations. In a large scale, one must compute the extinction coefficient using the Beer-Lambert Law A=εLC in which A is the measured absorbance, ε is the slope of the standard curve, L is the length of the cuvette, and C is the concentration being determined. In a micro scale, a cuvette may not be used and therefore one only has to rearrange to solve for x.
Urine examination Blood tests investigating the cause, including FBC, inflammatory markers, and special tests (including ASLO, ANCA, Anti-GBM, Complement levels, Anti-nuclear antibodies) Biopsy of the kidney Renal ultrasonography is useful for prognostic purposes in finding signs of chronic kidney disease, which however may be caused by many other diseases than glomerulonephritis.
Sources: en.wikipedia.org
It shares the 44-residue sequence of human GHRH but carries an added trans-3-hexenoyl group at its N-terminus. That addition does not occur in the natural hormone and serves mainly to resist enzymatic breakdown. The receptor target and signaling pathway remain the same.
It binds the growth hormone-releasing hormone receptor on anterior pituitary cells. Activation of that receptor promotes synthesis and release of growth hormone. The effect propagates through the growth hormone and insulin-like growth factor 1 axis.
Native GHRH is cleared quickly by peptidases, which limits how long it can stimulate its receptor. The added group hinders one of the primary cleavage enzymes. The practical consequence is a longer period of receptor activity per dose.
Reconstituted solutions are kept cold and used within the period stated on the label or certificate. Repeated warming and cooling cycles should be avoided because they encourage aggregation and gradual loss of potency.