Everything below concerns Somatotroph. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-02-05. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
After injection, the peptide binds receptors on somatotroph cells in the anterior pituitary. Receptor activation raises intracellular cyclic AMP and triggers release of stored growth hormone into the bloodstream. Because the compound works through the body's own regulatory system, growth hormone pulses retain much of their normal feedback control. Repeated administration also raises insulin-like growth factor 1, a hormone produced mainly in the liver. Investigators treat that rise as a marker that the pituitary axis has been engaged.
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.
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.
Receptor-level activity begins when the peptide binds the GHRH receptor, a class B G-protein-coupled receptor found on pituitary somatotroph cells. Occupancy triggers Gs-mediated activation of adenylyl cyclase and a rise in intracellular cyclic AMP, which in turn promotes synthesis and pulsatile release of growth hormone. Because the compound acts upstream of the growth hormone axis rather than supplying hormone directly, its effect depends on intact pituitary function. Binding studies in cell culture and animal models have established this pathway; the detailed kinetics of receptor recycling in humans remain less well characterized.
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。
C-reactive protein (CRP) Procalcitonin (PCT) Presepsin soluble CD14 soluble CD163 soluble CD206 (mannose receptor) soluble TREM-1 The link between gut microbiota constitution and liver health (Particularly in Cirrhosis) has been well described, however specific biomarkers for prediction of Cirrhosis still requires further research. A 2014 study identified 15 microbial biomarkers from the gut microbiota. These could potentially be used to discriminate patients with liver cirrhosis from healthy individuals.
==== Cytokines ==== Illness can cause inflammation, which often involves an increase in cytokines such as TNFa, IL-1, and IL-6. Cytokines are implicated in NTIS. IL-1β has been shown to decrease liver D1, as well as thyroid hormone receptor (THR) levels. IL-6 and TNFa downregulate D1 and suppress TSH, are negatively correlated with fT3, and are positively correlated with rT3. NF-κB also inhibits D1, and decreases the expression of Thyroid receptors α and β. IFNy inhibits thyroid and Tg release, and also inhibits the upregulation of TSH receptors.
Turns are classified by their backbone dihedral angles (see Ramachandran plot). A turn can be converted into its inverse turn (in which the main chain atoms have opposite chirality) by changing the sign on its dihedral angles. (The inverse turn is not a true enantiomer since the Cα atom chirality is maintained.) Thus, the γ-turn has two forms, a classical form with (φ, ψ) dihedral angles of roughly (75°, −65°) and an inverse form with dihedral angles (−75°, 65°). At least eight forms of the beta turn occur, varying in whether a cis isomer of a peptide bond is involved and on the dihedral angles of the central two residues. The classical and inverse β-turns are distinguished with a prime, e.g., type I and type I′ beta turns. If an i → i + 3 hydrogen bond is taken as the criterion for turns, the four categories of Venkatachalam (I, II, II′, I′) suffice to describe all possible beta turns. All four occur frequently in proteins but I is most common, followed by II, I′ and II′ in that order.
In September 2015, chairman Russ Withers and chief executive Warren Wilmot announced they were resigning from the company. Deputy chairman Michael Smith replaced Withers, while Bob Baily was appointed as interim chief executive. In December 2015, Stewart Levitt of law firm Levitt Robinson Solicitors, who featured prominently in the Four Corners program, announced a potential class action lawsuit against 7-Eleven head office on behalf of franchisees who had allegedly been lured into signing on with 7-Eleven by false representations. This announcement was made on the same day as a Court finding describing Levvit Robinson's "hellish bullying" of Dr Brendan French, miring the action in controversy. Also on that day, 7-Eleven offered to pay "the first $25 million of back-pay claims brought by current and former workers. Franchisees would then pay the next $5 million and any payments after that would be split 50-50 between head office and franchisees." Fels "described the $25 million offer from head office as a 'significant step forward'" but added that his panel's investigation would not be effected. 7-Eleven ultimately paid more than $173 million for "systematic wage theft" to workers employed between 2015 and 2020. Levvit Robinson was forced to retract misleading statements made in advertising to 7-Eleven franchisees in June 2018 by the Federal Court of Australia. This occurred only months after Levvit Robinson launched a new class action against 7-Eleven that included the ANZ Bank despite banks having stopped loans to 7-Eleven franchisees in 2015.
Sources: en.wikipedia.org
=== Europe === The presence of Medical Physicists at Expert level ('Medical Physics Experts') in healthcare in the European Union is required by the 2013/59/Euratom directive. The European Federation of Organisations for Medical Physics(EFOMP) has defined a detailed inventory of learning outcomes for Medical Physics Experts in terms of Knowledge, Skills and Competences (the latter in Europe means 'responsibilities'). In Europe the professional preparation for Medical Physicists typically consists of a first degree in Physics or equivalent (e.g., biophysics, electrical or mechanical engineering, computing), a Masters in Medical Physics and a 2-year training Residency. The European Commission has produced 'European Guidelines on the Medical Physics Expert'.
At this point, there was a sudden burst of element formation (first deuterium, which immediately fused into helium). However, very soon thereafter, at twenty minutes after the Big Bang, the Universe became too cool for any further nuclear fusion or nucleosynthesis. At this point, the elemental abundances were nearly fixed, changing only as some of the radioactive products of Big Bang nucleosynthesis (such as tritium) decayed. The deuterium bottleneck in the formation of helium, together with the lack of stable ways for helium to combine with hydrogen or with itself (no stable nucleus has a mass number of 5 or 8) meant that an insignificant amount of carbon, or any elements heavier than carbon, formed in the Big Bang. These elements thus required formation in stars. At the same time, the failure of much nucleogenesis during the Big Bang ensured that there would be plenty of hydrogen in the later universe available to form long-lived stars, such as the Sun.
==== Tim Hortons ==== The parent company of Cold Stone Creamery, Kahala Brands, announced in February 2009 that it had reached an agreement with Canadian coffee shop chain Tim Hortons to open 100 co-branded stores in the United States after successfully testing two locations in Rhode Island. The strategic alliance was intended to pave the way for Tim Hortons to operate in more US locations while allowing Cold Stone Creamery to expand into Canada. The most notable co-branded store opened in August 2009 when Tim Hortons moved into three Cold Stone Creamery locations in New York City, including its flagship Times Square location. In June 2009, Cold Stone Creamery started testing the Canadian market by opening seven co-branded locations with Tim Hortons in Toronto, Oakville, Mississauga, Hamilton, Pickering, Sudbury, and Halifax, Nova Scotia. They had locations in every Canadian province except for Newfoundland and Labrador. The Tim Hortons venture followed on the footsteps of a similar co-branding efforts in 2007 and 2008, but ended in 2014.
According to the United States House Select Committee on Strategic Competition between the United States and the Chinese Communist Party, the Chinese government directly subsidizes producers of fentanyl precursors and analogues through tax rebates and other incentives. Since 2019, the Chinese government has removed online records of subsidies for fentanyl-related producers. In 2016, federal legislation loosened the de minimis exemption, which permitted parcels under $800 in value to enter the country duty-free with minimal inspection. The change in the de minimis eligibility led to the rapid growth in parcels coming from China, including those containing fentanyl. Deaths from fentanyl in 2016 increased by 540 percent across the United States since 2013. This accounts for almost "all the increase in drug overdose deaths from 2015 to 2016", according to a study published in the Journal of the American Medical Association. Readily available fentanyl killed 70,000 people in 2021 alone. Fentanyl-laced heroin has become a big problem for major cities, including Philadelphia, Detroit and Chicago. Its use has caused a spike in deaths among users of heroin and prescription painkillers, while becoming easier to obtain and conceal. Some arrested or hospitalized users are surprised to find that what they thought was heroin was actually fentanyl. According to former CDC director Tom Frieden in 2016:
=== Vas deferens === The vas deferens can grow back together after a vasectomy–thus resulting in vasectomy failure. This occurs due to the fact that the epithelium of the vas deferens, similar to the epithelium of some other human body parts, is capable of regenerating and creating a new tube in the event that the vas deferens is damaged and/or severed. Even when as much as five centimeters, or two inches, of the vas deferens is removed, the vas deferens can still grow back together and become reattached–thus allowing sperm to once again pass and flow through the vas deferens, restoring one's fertility.
Sources: en.wikipedia.org
== Target organelle == In contrast to IP3 and cyclic ADP-ribose which predominantly mobilize Ca2+ from the neutral and abundant endoplasmic reticulum (ER) store, NAADP selectively targets acidic Ca2+ stores — usually less abundant than the ER but with a pivotal role that belies their size. This paradigm shift away from the ER derives from seminal studies, again in sea urchin egg, that showed NAADP-mediated Ca2+ release was sensitive to agents that target acidic organelles (e.g. bafilomycin A1) but was less sensitive to ones that interfere with ER Ca2+ storage (e.g. thapsigargin).
After the start of the civil war, various new telecommunications companies began to spring up and compete to provide missing infrastructure. Funded by Somali entrepreneurs and backed by expertise from China, South Korea and Europe, these nascent telecommunications firms offer affordable mobile phone and Internet services that are not available in many other parts of the continent. Customers can conduct money transfers (such as through the popular Dahabshiil) and other banking activities via mobile phones, as well as easily gain wireless Internet access. After forming partnerships with multinational corporations such as Sprint, ITT and Telenor, these firms now offer the cheapest and clearest phone calls in Africa. These Somali telecommunication companies also provide services to every city and town in Somalia. There are presently around 25 mainlines per 1,000 persons, and the local availability of telephone lines (tele-density) is higher than in neighbouring countries; three times greater than in adjacent Ethiopia. Prominent Somali telecommunications companies include Golis Telecom Group, Hormuud Telecom, Somafone, Nationlink, Netco, Telcom and Somali Telecom Group. Hormuud Telecom alone grosses about US$40 million a year. Despite their rivalry, several of these companies signed an inter-connectivity deal in 2005 that allows them to set prices, maintain and expand their networks, and ensure that competition does not get out of control. The state-run Somali National Television is the principal national public service TV channel.
Tequila is made from the blue agave plant, primarily in the area surrounding the town of Tequila 65 km (40 mi) northwest of Guadalajara, and in the Jaliscan Highlands (Los Altos de Jalisco) of the central western Mexican state of Jalisco. Aside from its geographical distinction, tequila is differentiated from other varieties of mezcal in that all of the agave used in tequila is blue agave, and the methods of production are different. The red volcanic soils in the region of Tequila are well suited for growing the blue agave, and more than 300 million plants are harvested there each year. Agave grows differently depending on the region. Blue agaves grown in the highland Los Altos region are larger and sweeter in aroma and taste. Agaves harvested in the valley region have a more herbaceous fragrance and flavor. Due to its historical and cultural importance, the region near Tequila was declared a UNESCO World Heritage Site in 2006, the Agave Landscape and Ancient Industrial Facilities of Tequila. Planting, tending, and harvesting the agave plant remains a manual effort, largely unchanged by modern farm machinery and relying on centuries-old expertise. The people who harvest it, the jimadores [ximaˈðoɾes], passed down the knowledge of how the plants should be cultivated from generation to generation. By regularly trimming any quiotes [ˈkjotes] (a stalk at the center of the plant that could grow several meters high if not cut back), the jimadores prevent the agave from flowering and dying early, allowing it to fully ripen.
==== Neurological ==== Catatonia can occur due to several neurological conditions. For instance, certain types of encephalitis can cause catatonia. Anti-NMDA receptor encephalitis is a form of autoimmune encephalitis known to cause catatonia, albeit very rarely. Additionally, encephalitic catatonia has been reported in cases of severe HIV and herpes simplex virus infections. A small amount of evidence suggests that catatonia can develop after traumatic brain injury in the absence of a primary psychiatric disorder. Similarly, there are several case reports of catatonia after a stroke, with some having catatonia-associated symptoms that were unexplainable by stroke itself and which improved after treatment with benzodiazepines. Parkinson's disease can cause catatonia for some people by impairing their ability to produce and secrete dopamine, a neurotransmitter which is thought to contribute to motor dysfunction in people with catatonia.
=== Constitutional reform === In 1988, new amendments to the Yugoslav Constitution were adopted, initiating a process of democratization. During 1988 and 1989, a successful round of coups in the Communist party leadership, known as the anti-bureaucratic revolution, in Vojvodina, Kosovo as well as Montenegro, replaced autonomous leaderships in this regions. The coups were led by Slobodan Milošević; supporter of Serbian nationalism. The events were condemned by the communist governments of the western Yugoslav republics (especially SR Slovenia and SR Croatia), who successfully resisted the attempts to expand the revolt onto their territories, and turned against Milošević. The rising antagonism eventually resulted in the dissolution of the ruling League of Communists of Yugoslavia in 1990, and subsequently in the breakup of Yugoslavia. In 1989, Slobodan Milošević was elected as President of the State Presidency of Serbia. He demanded that the federal Yugoslav government act for the interests of Serbia in Kosovo by sending in the Yugoslav People's Army to suppress separatism in the province. At the same time, several reforms of federal electoral system were proposed, with Serbia supporting a "one-citizen, one-vote" system, which would have given a majority of votes to Serbs. By that time, ethnic tensions in Yugoslavia increased, and the ruling League of Communists of Yugoslavia collapsed, followed by the crisis of federal institutions.
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。