Everything below concerns hexenoyl group. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-02. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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。
研究用与临床用材料的标准并不相同。质量控制通常覆盖纯度、残留溶剂、反离子含量、微生物限度与内毒素水平，各项均有对应检测方法。随货文件应包含批号、检测项目、方法与结果，使数据可以追溯。核验时应关注纯度是否按主峰面积计算、杂质是否已定性、方法是否经过验证，这些信息决定结果能否被外部重复。
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。
| 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 |
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.
Insulin-like growth factor 1 is produced largely in the liver in response to growth hormone signaling. Its concentration shifts over days rather than minutes, which makes it practical for tracking changes across a study period. Interpretation still depends on age, nutritional status, and concurrent illness, all of which independently affect the marker. Reference ranges are therefore stratified, and comparisons are usually made within an individual over time rather than against a single population threshold.
Assays for these markers differ in calibration and antibody specificity, so results from different platforms are not always interchangeable. Reported values can shift when a laboratory changes method, even without any biological change. Studies that span long periods or multiple sites often need cross-validation of assays. This methodological variability is a recognized limitation when comparing findings across published reports, and it remains a topic of ongoing standardization work.
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.
== Lifestyle protective factors == Exercise and caffeine consumption are known to help decrease the risks of PD. Diet can also affect the level of risk: eating patterns rich in fruits, vegetables, whole grains, and fish, are associated with reduced risk of Parkinson's disease, while diets high in red meats and processed foods are associated with increased risk.
Throughout the 1980s, estimates of illegal drug value in Colombia ranged from $2bn to $4bn. This made up about 7–10% of the $36bn estimated Gross National Product (GNP) of Colombia during this decade. In the 1990s, the estimates of the illegal drug value remained roughly within the same range (~$2.5bn). As the Colombian GNP rose throughout the 1990s ($68.5bn in 1994 and $96.3bn in 1997), illegal drug values began to comprise a decreasing fraction of the national economy. By the early 1990s, although Colombia led in the exportation of cocaine, it found increasing confrontations within its state. These confrontations were primarily between cartels and government institutions. This led to a decrease in the drug trade's contribution to the GDP of Colombia; dropping from 5.5% to 2.6%. Though a contributor of wealth, the distribution of cocaine has had negative effects on the socio-political situation of Colombia and has weakened its economy as well.
In chemistry, isotopologues (also spelled isotopologs) are molecules that differ only in their isotopic composition. They have the same chemical formula and bonding arrangement of atoms, but at least one atom has a different number of neutrons than the parent. An example is water, whose hydrogen-related isotopologues are: "light water" (HOH or H2O), "semi-heavy water" with the deuterium isotope in equal proportion to protium (HDO or 1H2HO), "heavy water" with two deuterium atoms (D2O or 2H2O); and "super-heavy water" or tritiated water (T2O or 3H2O, as well as HTO [1H3HO] and DTO [2H3HO], where some or all of the hydrogen is the radioactive tritium isotope). Oxygen-related isotopologues of water include the commonly available form of heavy-oxygen water (H218O) and the more difficult to separate version with the 17O isotope. Both elements may be replaced by isotopes, for example in the doubly labeled water isotopologue D218O. Altogether, there are 9 different stable water isotopologues, and 9 radioactive isotopologues involving tritium, for a total of 18. However only certain ratios are possible in mixture, due to prevalent hydrogen swapping. The atom(s) of the different isotope may be anywhere in a molecule, so the difference is in the net chemical formula. If a compound has several atoms of the same element, any one of them could be the altered one, and it would still be the same isotopologue. When considering the different locations of the same isotope, the term isotopomer, first proposed by Seeman and Paine in 1992, is used.
== Toxicity == Toxic effects of retinoids occur with both acute and prolonged intake, depending on which retinoid is considered. The specific toxicity is related to the mechanism of action as well as exposure. A medical sign of chronic or acute poisoning with retinol is hypervitaminosis A, which includes the presence of painful, tender swellings on the long bones. Anorexia, skin lesions, hair loss, hepatosplenomegaly, papilloedema, bleeding, general malaise, pseudotumor cerebri, and death may also occur. Retinoids provoke rapid elevation of circulating triglycerides leading to hypertriglyceridemia as well as cholesterol, leading to hypercholesterolemia. Retinoids are further shown to worsen many metabolic diseases, such as diabetes and congestive heart failure. Large-scale randomized, controlled clinical trials have conclusively shown that vitamin A, retinol, and other retinoids increase mortality and cancer rates in smokers and asbestos workers. In addition to the harmful effects shared by other retinoids, bexarotene causes severe hypothyroidism. The Pharmacovigilance Risk Assessment Committee (PRAC), based on its review, confirmed that taking oral retinoids during pregnancy can have harmful effects on the baby as they may cause CNS, cranio-facial, cardiovascular and other defects. The use of acitretin, alitretinoin and isotretinoin should be prohibited in women of childbearing age unless they take measures to prevent pregnancy. Many lotions that claim to prevent or treat stretch marks contain retinol, which is not an ingredient that is safe for pregnant women.
Sources: en.wikipedia.org
Necrotizing periodontal diseases are non-contagious infections but may occasionally occur in epidemic-like patterns due to shared risk factors. The milder form, necrotizing ulcerative gingivitis (also termed "trench mouth"), is characterized by painful, bleeding gums and ulceration and necrosis of the interdental papilla. There may also be intra-oral halitosis, cervical lymphadenitis (swollen lymph nodes in the neck) and malaise. Predisposing factors include psychological stress, sleep deprivation, poor oral hygiene, smoking, immunosuppression and/or malnutrition. Necrotizing ulcerative periodontitis (NUP) is where the infection leads to attachment loss, and involves only the gingiva, periodontal ligament and alveolar ligament. Progression of the disease into tissue beyond the mucogingival junction characterizes necrotizing stomatitis (cancrum oris).
=== Oxoacids, oxoanions, and oxoacid salts === Many nitrogen oxoacids are known, though most of them are unstable as pure compounds and are known only as aqueous solutions or as salts. Hyponitrous acid (H2N2O2) is a weak diprotic acid with the structure HON=NOH (pKa1 6.9, pKa2 11.6). Acidic solutions are quite stable but above pH 4 base-catalysed decomposition occurs via [HONNO]− to nitrous oxide and the hydroxide anion. Hyponitrites (involving the N2O2−2 anion) are stable to reducing agents and more commonly act as reducing agents themselves. They are an intermediate step in the oxidation of ammonia to nitrite, which occurs in the nitrogen cycle. Hyponitrite can act as a bridging or chelating bidentate ligand. Nitrous acid (HNO2) is not known as a pure compound, but is a common component in gaseous equilibria and is an important aqueous reagent: its aqueous solutions may be made from acidifying cool aqueous nitrite (NO−2, bent) solutions, although already at room temperature disproportionation to nitrate and nitric oxide is significant. It is a weak acid with pKa 3.35 at 18 °C. They may be titrimetrically analysed by their oxidation to nitrate by permanganate. They are readily reduced to nitrous oxide and nitric oxide by sulfur dioxide, to hyponitrous acid with tin(II), and to ammonia with hydrogen sulfide. Salts of hydrazinium N2H+5 react with nitrous acid to produce azides which further react to give nitrous oxide and nitrogen.
Akram Elias is a businessman from Lebanon living in Washington, D.C., who was the founder and CEO of a private consulting firm in the city called Capital Communications Group. Elias was initiated as a Freemason in 1996, and by 2008 was the Most Worshipful Brother (former Master) of Potomac Lodge No. 5, but had also been raised into stature within the Grand Lodge of Masonic Education and the Grand Lodge of Washington, D. C. The first time he toured Cuba was in 2001, and he made several trips over the years. On one of those trips, in 2004, he personally met Grand Master Collera Venta to discuss Freemasonry in America (e.g., the Americas), and the future of Cuban Freemasonry. In 2004, Alan Gross, a Maryland man from DAI Global, a subcontracting company for USAID, carried a package of electronics equipment and money to Cuba for Marc Wachtenheim. Gross didn't know any Spanish, and was not an expert on Cuba. Gross delivered this package to Grand Master Collera Venta. Gross made five trips to the island between 2004 and 2009, smuggling communications equipment to Collera Venta every time. Certain items that Alan Gross carried into Cuba were BGAN satellite internet links into Jewish communities to circumvent the Cuban firewall. Gross also reached out to Jewish American humanitarian organizations like the Jewish Federations of North America and their chapter in Broward County, Florida, to smuggle contraband items into Jewish communities in Cuba to allow them to communicate to the outside world.
====== Occupational medicine ====== To train in the add-on specialty of occupational medicine a physician must first be a specialist in one of the pediatric class specialties, one of the independent class specialties (excluding clinical pharmacology, clinical genetics, forensic medicine, and social medicine), one of the internal medicine class specialties, one of the neurological class specialties (excluding clinical neurophysiology) or one of the psychiatric class specialties.
== External links == David S, Lancaster T, Stead LF. Opioid antagonists for smoking cessation (Cochrane Review), The Cochrane Library, Issue 2, 2005. Chichester, UK: John Wiley & Sons, Ltd. Opioid+Antagonists at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
Sources: en.wikipedia.org
== Medical uses == Cipaglucosidase alfa is a long-term enzyme replacement therapy used in combination with the enzyme stabilizer miglustat for the treatment of adults with late-onset Pompe disease (acid α-glucosidase [GAA] deficiency).
Instant coffee is a beverage derived from processed brewed coffee beans that is quickly prepared by adding hot water or milk to powdered solid coffee extracts. Instant coffee solids in powdered or crystallized form (also called soluble coffee, coffee extract, coffee crystals, coffee powder, or powdered coffee, and often sold as "instant coffee") refers to dehydrated and packaged solids used to make the instant coffee beverage. The product was invented in 1890 in Invercargill, Southland, New Zealand by David Strang. Instant coffee solids are commercially prepared by either freeze-drying or spray drying coffee beverage. Instant coffee is also manufactured in a concentrated liquid form. Instant coffee has advantages over coffee brewed from ground coffee beans including speed of preparation (instant coffee dissolves quickly in hot water), lower shipping weight and volume than beans or ground coffee for the same amount of beverage, and long shelf life—though instant coffee can spoil if not kept dry. However, the beverage made from ground coffee is considered to have superior quality and taste. Instant coffee also reduces cleanup since there are no coffee grounds. At least one study has found that instant coffee has a lower environmental footprint than drip filter coffee and capsule espresso coffee, on a prepared beverage basis, disregarding quality and appeal of the beverage produced. The global instant coffee market was valued at US$4.16 Billion in 2026.
Since its half-life of 5.5 to 26 hours is quite long, consciousness would take a long time to return. In veterinary medicine, sodium thiopental is used to induce anesthesia in animals. Since it is redistributed to fat, certain lean breeds of dogs such as sighthounds have prolonged recoveries from sodium thiopental due to their lack of body fat. Conversely, obese animals recover rapidly, but it takes much longer for the drug to be entirely removed (metabolized) from their bodies. Sodium thiopental is always administered intravenously, as it can be fairly irritating to tissue and is a vesicant; severe tissue necrosis and sloughing can occur if it is injected incorrectly into the tissue around a vein.
An adrenaline junkie is someone who "has a compulsive desire for extreme excitement". Such activities include extreme and risky sports, substance abuse, unsafe sex, and crime. The term relates to the increase in circulating levels of adrenaline during physiological stress. Such an increase in the circulating concentration of adrenaline is secondary to the activation of the sympathetic nerves innervating the adrenal medulla, as it is rapid and not present in animals where the adrenal gland has been removed. Although such stress triggers adrenaline release, it also activates many other responses within the central nervous system reward system, which drives behavioral responses; while the circulating adrenaline concentration is present, it may not drive behavior. Nevertheless, adrenaline infusion alone does increase alertness and has roles in the brain, including the augmentation of memory consolidation.
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.
多肽在反相柱上按疏水性差异分离，能有效区分主峰、缺失序列片段与氧化产物。配合紫外检测可获得可量化的纯度百分比，是肽类分析的常规手段。