The short version of assay standardization fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
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.
Stimulated growth hormone release leads to hepatic production of insulin-like growth factor 1, a key mediator of many growth hormone effects. In clinical studies, tesamorelin increased IGF-1 levels in a dose-dependent manner, although the response varies among individuals. The drug's effect on visceral fat is thought to involve growth hormone-mediated lipolysis and altered adipocyte metabolism. Muscle mass and lean body mass have also been assessed as secondary outcomes, but changes are generally smaller and less consistent than fat reductions.
Pharmacodynamic studies show that tesamorelin reduces visceral adipose tissue more than subcutaneous adipose tissue in the studied population. This selectivity may relate to differences in blood flow and hormone sensitivity between fat depots. Effects on glucose metabolism and insulin sensitivity have been investigated, with some trials reporting modest changes and others showing stability. The precise relationship between growth hormone exposure, IGF-1 levels, and visceral fat loss remains an active area of analysis.
Tesamorelin binds to growth hormone-releasing hormone receptors on somatotroph cells in the anterior pituitary. Receptor activation increases intracellular cyclic AMP and promotes synthesis and secretion of growth hormone. Because the peptide mimics endogenous GHRH, it amplifies the normal pulsatile release of growth hormone rather than providing exogenous growth hormone directly. This upstream action distinguishes tesamorelin from recombinant growth hormone preparations and from growth hormone secretagogues that act at different receptors.
| 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 |
A documented effect of tesamorelin is a reduction in visceral adipose tissue in some study populations. Researchers have reported decreases in trunk fat measured by computed tomography alongside changes in lipid markers. The mechanism is thought to involve growth hormone-mediated lipolysis, though the precise contribution of direct versus indirect pathways is not fully resolved. Studies have generally examined defined groups over finite periods, so long-term outcomes are less well characterized. Findings have not been uniform across all trials.
Tesamorelin is a synthetic peptide analog of growth hormone-releasing hormone (GHRH). Its sequence corresponds to the 44-amino-acid form of human GHRH with a trans-3-hexenoyl group attached to the N-terminal tyrosine. This modification slows enzymatic cleavage and extends the peptide's activity relative to the native hormone. The compound is produced by solid-phase peptide synthesis and supplied as a lyophilized powder. Researchers classify it as a GHRH receptor agonist. Its structure places it in the same family as other growth hormone secretagogues that act on the pituitary.
Binding of tesamorelin to GHRH receptors on pituitary somatotroph cells triggers cyclic AMP signaling and the release of growth hormone into circulation. Because the peptide acts upstream of the growth hormone axis, its effects are partly mediated by hepatic insulin-like growth factor 1 (IGF-1) production. The pulsatile character of endogenous growth hormone secretion is preserved rather than replaced. Whether amplified signaling produces effects beyond those of native GHRH remains an area of ongoing investigation.
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.
== SV == sv – (s) Swedish language (ISO 639-1 code) SV (s) El Salvador (ISO 3166 digram) (p) Sportverein (German for "Sport Association", as in Hamburger SV and SV Werder Bremen) SVC – (i) Secondary Visual Cortex SvD – (p) Svenska Dagbladet (Swedish newspaper) SVD (i) Singular Value Decomposition Snaiperskaya Vintovka Dragunova (Снайперская винтовка Драгунова, Russian for "Dragunov Sniper Rifle") SVG – (i) Scalable Vector Graphics SVK – (s) Slovakia (ISO 3166 trigram) SVM (p) Stroboscopic effect Visibility Measure; a measure for assessing a type of temporal light artefacts (i) Support Vector Machine (artificial intelligence) SVN – (s) Slovenia (ISO 3166 and FIFA trigram) SVO – (i) subject–verb–object SVR – (i) Sluzhba Vneshney Razvedki (Служба Внешней Разведки, Russian for "Foreign Intelligence Service")
=== Places of worship === There are three Church of England churches in Wilmslow: St Bartholomew's, St Anne's and St John's. St Bartholomew's is a 16th-century building, which was modified in the 19th century; it has a turreted bell tower. The first rector of the church was a Thomas Dale, who is buried beneath a headstone presumably engraved by him outside the entrance to the church. Wilmslow Methodist Church occupies a modern building close to the town centre, replacing an 1886 building which itself replaced the original 1798 church, built seven years after John Wesley's death. The Sacred Heart & St Teresa's Church is the Roman Catholic church and dates from the late 19th century. Dean Row Chapel, 2 miles (3.2 km) east of the town centre, is a Grade II* listed building built around the end of the 17th century. Initially Presbyterian, it is now a Unitarian chapel. There is also a United Reformed Church in Wilmslow, close to the town centre.
== See also == Biological half-life, the time it takes for a substance to lose half of its pharmacologic, physiologic, or radiologic activity Effective half-life, the effective radioactive half-life in organisms after accounting for excretion Half-life of knowledge, the amount of time that has to elapse before half of the knowledge or facts in a particular area is superseded or shown to be untrue Half a Life (disambiguation)
Cytokinins (CKs) are a group of chemicals that influence cell division and shoot formation. They also help delay senescence of tissues, are responsible for mediating auxin transport throughout the plant, and affect internodal length and leaf growth. They were called kinins in the past when they were first isolated from yeast cells. Cytokinins and auxins often work together, and the ratios of these two groups of plant hormones affect most major growth periods during a plant's lifetime. Cytokinins counter the apical dominance induced by auxins; in conjunction with ethylene, they promote abscission of leaves, flower parts, and fruits. Among the plant hormones, the three that are known to help with immunological interactions are ethylene (ET), salicylates (SA), and jasmonates (JA), however more research has gone into identifying the role that cytokinins play in this. Evidence suggests that cytokinins delay the interactions with pathogens, showing signs that they could induce resistance toward these pathogenic bacteria. Accordingly, there are higher CK levels in plants that have increased resistance to pathogens compared to those which are more susceptible. For example, pathogen resistance involving cytokinins was tested using the Arabidopsis species by treating them with naturally occurring CK (trans-zeatin) to see their response to the bacteria Pseudomonas syringa. Tobacco studies reveal that over expression of CK inducing IPT genes yields increased resistance whereas over expression of CK oxidase yields increased susceptibility to pathogen, namely P. syringae.
Sources: en.wikipedia.org
=== Wellman Plastics === All characters below appear in the first season and part of the second season before being written out altogether. Clooney would make one more appearance in a season four episode.
An enzyme inhibitor is a molecule that binds to an enzyme and blocks its activity. Enzymes are proteins that speed up chemical reactions necessary for life, in which substrate molecules are converted into products. An enzyme facilitates a specific chemical reaction by binding the substrate to its active site, a specialized area on the enzyme that accelerates the most difficult step of the reaction. An enzyme inhibitor stops ("inhibits") this process, either by binding to the enzyme's active site (thus preventing the substrate itself from binding) or by binding to another site on the enzyme such that the enzyme's catalysis of the reaction is blocked. Enzyme inhibitors may bind reversibly or irreversibly. Irreversible inhibitors form a chemical bond with the enzyme such that the enzyme is inhibited until the chemical bond is broken. By contrast, reversible inhibitors bind non-covalently and may spontaneously leave the enzyme, allowing the enzyme to resume its function. Reversible inhibitors produce different types of inhibition depending on whether they bind to the enzyme, the enzyme-substrate complex, or both. Enzyme inhibitors play an important role in all cells, since they are generally specific to one enzyme each and serve to control that enzyme's activity. For example, enzymes in a metabolic pathway may be inhibited by molecules produced later in the pathway, thus curtailing the production of molecules that are no longer needed. This type of negative feedback is an important way to maintain balance in a cell.
== External links == "Opioid Receptors: μ". The International Union of Basic and Clinical Pharmacology, The British Pharmacological Society, The University of Edinburgh. International Union of Basic and Clinical Pharmacology. mu+Opioid+Receptor at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Human OPRM1 genome location and OPRM1 gene details page in the UCSC Genome Browser.
This allows synaptic terminals and glial cells to work together to maintain a proper supply of glutamate, which can also be produced by transamination of 2-oxoglutarate, an intermediate in the citric acid cycle. Recent electrophysiological evidence suggests that active synapses require presynaptically localized glutamine glutamate cycle to maintain excitatory neurotransmission in specific circumstances. In other systems, it has been suggested that neurons have alternate mechanisms to cope with compromised glutamate–glutamine cycling.
=== In television === "Cancelled", an episode of the animated sitcom South Park Series 2 of COBRA, a British thriller series, revolves around a sustained campaign of cyberwar against the United Kingdom and the British government's response to it.
Sources: en.wikipedia.org
=== High Pressure Cell Disruption === Since the 1940s high pressure has been used as a method of cell disruption, most notably by the French Pressure Cell Press, or French Press for short. This method was developed by Charles Stacy French and utilises high pressure to force cells through a narrow orifice, causing the cells to lyse due to the shear forces experienced across the pressure differential. While French Presses have become a staple item in many microbiology laboratories, their production has been largely discontinued, leading to a resurgence in alternate applications of similar technology. Modern physical cell disruptors typically operate via either pneumatic or hydraulic pressure. Although pneumatic machines are typically lower cost, their performance can be unreliable due to variations in the processing pressure throughout the stroke of the air pump. It is generally considered that hydraulic machines offer superior lysing ability, especially when processing harder to break samples such as yeast or Gram-positive bacteria, due to their ability to maintain constant pressure throughout the piston stroke. As the French Press, which is operated by hydraulic pressure, is capable of over 90% lysis of most commonly used cell types it is often taken as the gold standard in lysis performance and modern machines are often compared against it not only in terms of lysis efficiency but also in terms of safety and ease of use.
Familial: Family history of hirsutism with normal androgen levels. Drug-induced: medications were used before the onset of hirsutism. The recommendation is to stop the medication and replace it with another. Minoxidil Androgens like testosterone, anabolic steroids, and androgenic progestins Valproic acid and methyldopa Pregnancy: Due to changes in hormone production Idiopathic: When no other cause can be attributed to an individual's hirsutism, the cause is considered idiopathic by exclusion. In these cases, menstrual cycles and levels of conventionally tested androgens (testosterone, androstenedione, and dehydroepiandrosterone sulfate) are normal. Around 10 to 15% of women with hirsutism have idiopathic hirsutism. Idiopathic hirsutism may be due to increased production of dihydrotestosterone (DHT) in hair follicles and hence may actually still be due to hyperandrogenism. It may be detectable by measurement of DHT or DHT metabolites. Rice et al. 2016 propose that idiopathic hirsutism is caused by epigenetic inheritance of discordant epigenetic markers. It is testable with current technology.
== Sources == Aristotle. Metaphysics Nicomachean Ethics On the Soul. Physics Caston, Victor. "Aristotle's Psychology". A Companion to Ancient Philosophy. Ed. Mary Gill and Pierre Pellegrin. Hoboken: Wiley-Blackwell, 2006. 316–46. "Aristotle's Two Intellects: A Modest Proposal". Phronesis 44.3 (1999): 199–227. Cross, Richard. The Physics of Duns Scotus. Oxford: Oxford UP, 1998. Eberl, Jason T. "Aquinas on the Nature of Human Beings." The Review of Metaphysics 58.2 (November 2004): 333–65. Gilson, Étienne. The Philosophy of St. Bonaventure. Trans. F. J. Sheed. NY: Sheed & Ward, 1938. Irwin, Terence. Aristotle's First Principles. Oxford: Oxford UP, 1990. Keck, David. Angels & Angelology in the Middle Ages. NY: Oxford UP, 1998. Kenny, Anthony. Aquinas on Mind. London: Routledge, 1993. Leftow, Brian. "Souls Dipped in Dust." Soul, Body, and Survival: Essays on the Metaphysics of Human Persons. Ed. Kevin Corcoran. NY: Cornell UP, 2001. 120–38. "Soul, Mind, and Brain." The Waning of Materialism. Ed. Robert C. Koons and George Bealer. Oxford: Oxford UP, 2010. 395–417. McEvilley, Thomas. The Shape of Ancient Thought. NY: Allworth, 2002. Mendell, Henry. "Aristotle and Mathematics". Stanford Encyclopedia of Philosophy. 26 March 2004. Stanford University. 2 July 2009 <http://plato.stanford.edu/entries/aristotle-mathematics/>. Normore, Calvin. "The Matter of Thought". Representation and Objects of Thought in Medieval Philosophy. Ed. Henrik Lagerlund. Hampshire: Ashgate, 2007. 117–133. Pasnau, Robert. Thomas Aquinas on Human Nature. Cambridge: Cambridge UP, 2001. Robinson, Timothy.
The global moisture budget is primarily being influenced by tropical sea surface temperatures from the position of the Intertropical Convergence Zone (ITCZ). The Southern Hemisphere has a unique meteorological feature positioned in the southwestern Pacific Basin called the South Pacific Convergence Zone (SPCZ), which contains a perennial position within the Southern Hemisphere. During ENSO warm periods, the SPCZ reverses orientation extending from the equator down south through Solomon Islands, Vanuatu, Fiji and towards the French Polynesian Islands; and due east towards South America affecting geochemistry of corals in tropical regions. Geochemical analysis of skeletal coral can be linked to sea surface salinity (SSS) and sea surface temperature (SST), from El Nino 3.4 SSTA data, of tropical oceans to seawater δ18O ratio anomalies from corals. ENSO phenomenon can be related to variations in sea surface salinity (SSS) and sea surface temperature (SST) that can help model tropical climate activities.
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.
It targets the growth hormone-releasing hormone receptor on pituitary somatotroph cells. Binding stimulates cyclic AMP signaling and growth hormone secretion. This is the same receptor used by endogenous GHRH.