This is a working overview of Insulin-like growth factor 1, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-09-06 and is reviewed periodically as new material appears.
Whether the drug improves hard clinical outcomes is not settled. No completed trial has shown a reduction in heart attacks or strokes among treated patients, although a dedicated cardiovascular outcomes study has been discussed in the literature. Investigators have also examined hepatic fat in people with HIV and fatty liver disease, cognitive measures in small cohorts, and changes in bone density. Regulatory labeling emphasizes monitoring of insulin-like growth factor 1 because supraphysiologic levels raise questions about tissue growth, and the clinical significance of that signal remains an open question rather than a demonstrated harm.
Binding of tesamorelin to the growth hormone-releasing hormone receptor on anterior pituitary somatotrophs activates a Gs protein pathway, raises cyclic AMP, and triggers release of stored growth hormone into the bloodstream. Because the analogue resists dipeptidyl peptidase-4, its plasma residence time exceeds that of native GHRH, producing a larger and more sustained secretory signal. The released growth hormone then acts on the liver and peripheral tissues to raise insulin-like growth factor 1, which feeds back on the hypothalamus and pituitary. This axis explains both the intended effects on fat distribution and the biological markers used to track them.
Studies of the compound rely on imaging and laboratory endpoints rather than on symptoms alone. Visceral adipose tissue is usually quantified by computed tomography or magnetic resonance imaging at the level of the abdomen, with waist circumference serving as a cheaper but less specific proxy. Blood work tracks insulin-like growth factor 1, fasting glucose, glycated hemoglobin, and lipid fractions. In the pivotal trials the imaging endpoint fell by roughly fifteen to twenty percent over six months, subcutaneous fat changed little, and the visceral fat returned toward baseline after treatment stopped, a pattern that shapes how clinicians discuss durability.
Published work tends to frame tesamorelin as a tool for studying the GHRH axis and as a compound with measurable effects on body composition. Reports often describe visceral adipose tissue as an endpoint, assessed by imaging rather than by inference. Analytical sections commonly describe liquid chromatography with tandem mass spectrometry to confirm identity and purity, because immunoassays may cross-react with related fragments. Where results diverge between studies, differences in assay choice, sampling timing, and population are frequent explanations offered. Whether effects persist after treatment stops remains an open question.
Tesamorelin binds the growth hormone–releasing hormone receptor on pituitary somatotroph cells. The receptor signals through the Gs protein, raising intracellular cAMP and activating protein kinase A. That cascade triggers release of stored growth hormone in pulses rather than a steady stream. Because the drug acts at the receptor that normally controls this process, its effect depends on the body's own signaling architecture rather than on a synthetic pathway. The resulting hormone profile reflects the timing of each pulse, not only its size.
Measured responses usually involve growth hormone and insulin-like growth factor 1, known as IGF-1. Growth hormone rises in bursts and is difficult to sample reliably, while IGF-1 shifts more slowly and can be assessed from a single blood draw. Studies therefore treat IGF-1 as the more practical pharmacodynamic marker. Both are indirect, showing that the receptor was engaged rather than that the peptide reached a particular concentration. Direct exposure measurement requires an assay aimed at the molecule itself.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilized cake in single-use vials |
| Solubility class | Freely soluble in water | Reconstituted with sterile diluent before injection |
| Typical storage temperature | 2 to 8 degrees Celsius | Before reconstitution; protect from light |
| Typical analytical method | Reversed-phase high-performance liquid chromatography | Purity and related-substance testing |
| Identity confirmation | Mass spectrometry | Observed mass near 5.1 kDa for the intact peptide |
=== 2014: show-cause notices === After sixteen months of investigations, ASADA issued show cause notices to 34 players from Essendon's 2012 player list on 12 June 2014, alleging that they had been administered Thymosin beta-4, having determined that it had sufficient evidence that this was the type of thymosin used in the program. Unlike AOD-9604, it was certain that Thymosin beta-4 was considered banned during the program. ASADA did not allege that the players had used the substances intentionally; rather, the club had knowingly injected the players with the banned substance, and that the players were unaware that it was illegal. The players had ten days to respond, which would be followed by a tribunal hearing in which the burden of proof fell on ASADA to prove that the banned substance was administered to the players. Under the anti-doping codes, players found guilty would receive, as a starting point, a two-year suspension; however, if they were able to demonstrate they were unwittingly given a prohibited substance, they may have been eligible for a 50 per cent reduction. The names of the 34 players were initially suppressed under court order, and were formally released only after the eventual guilty verdict in January 2016. While this was progressing, Essendon performed well under Mark Thompson during the 2014 season, finishing seventh on the ladder and being eliminated in the first week of the finals. Thompson left the club altogether after the season.
Depressants are psychoactive drugs that temporarily diminish the function or activity of a specific part of the body or mind. Colloquially, depressants are known as "downers", and users generally take them to feel more relaxed and less tense. Examples of these kinds of effects may include anxiolysis, sedation, and hypotension. Depressants are widely used throughout the world as prescription medicines and as illicit substances. When these are used, effects may include anxiolysis (reduction of anxiety), analgesia (pain relief), sedation, somnolence, cognitive/memory impairment, dissociation, muscle relaxation, lowered blood pressure/heart rate, respiratory depression, anesthesia, and anticonvulsant effects. Depressants exert their effects through a number of different pharmacological mechanisms, the most prominent of which include potentiation of GABA or opioid activity, and inhibition of adrenergic, histamine or acetylcholine activity. Some are also capable of inducing feelings of euphoria. The most widely used depressant by far is alcohol (i.e. ethanol). Stimulants or "uppers", such as amphetamines or cocaine, which increase mental or physical function, have an opposite effect to depressants. Depressants, in particular alcohol, can precipitate psychosis. A 2019 systematic review and meta-analysis by Murrie et al. found that the rate of transition from opioid, alcohol and sedative induced psychosis to schizophrenia was 12%, 10% and 9% respectively.
This latest advance, the novel secondary ion mass spectrometry–surface saturation (SIMS-SS), thus, involves modelling the hydrogen concentration profile of the surface versus depth, whereas the age determination is reached via equations describing the diffusion process, while topographical effects have been confirmed and monitored through atomic force microscopy.
In 1989, the communist governments in Poland and Hungary became the first to negotiate the organization of competitive elections. In Czechoslovakia and East Germany, mass protests unseated entrenched communist leaders. The communist regimes in Bulgaria and Romania also crumbled, in the latter case as the result of a violent uprising. Attitudes had changed enough that US Secretary of State James Baker suggested that the American government would not be opposed to Soviet intervention in Romania, on behalf of the opposition, to prevent bloodshed. The tidal wave of change culminated with the fall of the Berlin Wall in November 1989, which symbolized the collapse of European communist governments and graphically ended the Iron Curtain divide of Europe. The 1989 revolutionary wave swept across Central and Eastern Europe and peacefully overthrew all of the Soviet-style Marxist–Leninist states: East Germany, Poland, Hungary, Czechoslovakia and Bulgaria; Romania was the only Eastern-bloc country to topple its communist regime violently and execute its head of state.
==== Cold Climate Ration ==== The Cold Climate Ration (CCR) is a specialist and lightweight, high calorie 24 hour ration designed for use by troops above the snow line or in the high Arctic. It comprises mainly dehydrated main meals with a range of snacks designed to be eaten on the go. There are 8 menu choices available. The cold climate ration provides a minimum of 5500 kcals (23,030 kJ) a day.
Sources: en.wikipedia.org
Diatomite forms by the accumulation of the amorphous silica (opal, SiO2·nH2O) remains of dead diatoms (microscopic single-celled algae) in lake sediment or marine sediments. The fossil remains consist of a pair of symmetrical shells or frustules. Marine diatomites are found in association with a wide variety of other rock types but lacustrine diatomites are almost always associated with volcanic rock. Diatomaceous chert consists of diatomite that has been cemented with silica. Diatoms are able to extract silica from water that is less than 1% saturated in amorphous silica (saturation index (SI): -2). Their frustules remain undissolved because they are surrounded by an organic matrix. Clay minerals may also precipitate on the frustules and protect them from dissolution in sea water. When the diatom dies, the frustule is stripped of its organic layer and exposed to sea water. As a result, only 1% to 10% of frustules survive long enough to be buried under sediments and some of this is dissolved within the sediments. Only an estimated 0.05% to 0.15% of the original amount of silica produced by diatoms is preserved in the sedimentary record.
The strong homology seen in the insulin sequence of diverse species suggests that it has been conserved across much of animal evolutionary history. The C-peptide of proinsulin, however, differs much more among species; it is also a hormone, but a secondary one. Insulin is produced and stored in the body as a hexamer (a unit of six insulin molecules), while the active form is the monomer. The hexamer is about 36000 Da in size. The six molecules are linked together as three dimeric units to form symmetrical molecule. An important feature is the presence of zinc atoms (Zn2+) on the axis of symmetry, which are surrounded by three water molecules and three histidine residues at position B10. The hexamer is an inactive form with long-term stability, which serves as a way to keep the highly reactive insulin protected, yet readily available. The hexamer-monomer conversion is one of the central aspects of insulin formulations for injection. The hexamer is far more stable than the monomer, which is desirable for practical reasons; however, the monomer is a much faster-reacting drug because diffusion rate is inversely related to particle size. A fast-reacting drug means insulin injections do not have to precede mealtimes by hours, which in turn gives people with diabetes more flexibility in their daily schedules. Insulin can aggregate and form fibrillar interdigitated beta-sheets. This can cause injection amyloidosis, and prevents the storage of insulin for long periods.
==== Antifungals ==== Regular use of an over-the-counter or prescription antifungal shampoo or cream is a common treatment. The topical antifungal medications ketoconazole and ciclopirox have the best evidence. Ketoconazole should be used twice per week. Shampoo or soap containing zinc pyrithione, selenium disulfide, or piroctone olamine is also used. Products containing zinc pyrithione have been banned in the European Union since 2021 due to concerns over environmental toxicity alongside the presence of suitable alternatives. These options are often used daily and may also be used in conjunction with a ketoconazole shampoo regimen on alternate days. It is unclear if other antifungals are equally effective, as this has not been sufficiently studied. Antifungals that have been studied and found to be effective in the treatment of seborrhoeic dermatitis include ketoconazole, fluconazole, miconazole, bifonazole, sertaconazole, clotrimazole, flutrimazole, ciclopirox, terbinafine, butenafine, selenium disulfide, piroctone olamine and lithium salts such as lithium gluconate and lithium succinate. Topical climbazole appears to have little effectiveness in the treatment of seborrhoeic dermatitis. Systemic therapy with oral antifungals including itraconazole, fluconazole, ketoconazole is effective. Adverse side effects have been documented for fluconazole and ketoconazole, with the latter not recommended for use, while itraconazole, with its good safety profile, is the most commonly prescribed.
Besides being a physical barrier, the sulcular epithelium is able to release antimicrobial peptides which retard the growth of bacteria.This is through the secretion of defensins (β-defensins (hBD-1 and hBD-2)) which are a unique feature of the sulcular epithelium as compared to the junctional epithelium. However if plaque build-up occurs due to the lack of proper oral hygiene practices, bacteria are able to adhere to the sulcular epithelium using their fimbriae. It is discovered that the biofilm adhered to the sulcular epithelium consists of a rich content of glycocalyces, suggesting that these virulence factors allow the survival and colonisation of the periodontal pathogens. The fimbriae then induces the inflammatory response via the release of proinflammatory cytokines, leading to bone resorption. During periodontal disease, the epithelial barrier of the sulcular epithelium becomes discontinuous or ulcerated, compromising the integrity of these junctional complexes. This results in an increase in epithelial permeability and facilitates the passage of bacterial products. This is further promoted through the non-keratinised nature of the epithelium which also acts as a semi-permeable membrane. The transport of harmful bacterial products into the gingiva allows the detection of bacteria action which allows the sulcular epithelium to retaliate through the diffusion of the gingival crevicular fluid (GCF) containing inflammatory cells (neutrophils & small lymphocytes) & inflammatory mediators (IL-8, CXCL8 chemokines) into the sulcus.
==== Dilution effect ==== Death-penalty supporters state that the claim that pancuronium dilutes the sodium thiopental dose is erroneous. Supporters argue that pancuronium and thiopental are commonly used together in everyday surgery and that if there were a dilution effect, it would be a known drug interaction. Drug interactions are a complex topic. Simplistically, drug interactions can be classified as synergistic or inhibitory. Drug interactions can happen in two ways: directly at the place where the drug works or indirectly when the drug is processed in the liver or removed by the kidney. Pancuronium and thiopental have different sites of action, one in the brain and one at the neuromuscular junction. Since the half-life of thiopental is 11.5 hours, the metabolism of the drugs is not an issue when dealing with the short time frame in lethal injections. The only other plausible interpretation would be a direct one, or one in which the two compounds interact with each other. Supporters of the death penalty argue that this theory does not hold true. They state that even if the 100 mg of pancuronium directly prevented 500 mg of thiopental from working, sufficient thiopental to induce coma would be present for 50 hours. In addition, if this interaction did occur, then the pancuronium would be incapable of causing paralysis.
Sources: en.wikipedia.org
It mimics a natural hypothalamic signal that tells the pituitary to release growth hormone. The result is a rise in circulating growth hormone and, indirectly, in insulin-like growth factor 1. Over weeks of treatment this shift is associated with a selective decrease in fat stored inside the abdomen.
The primary measure is usually a cross-sectional abdominal scan that separates internal fat from fat just under the skin. Waist circumference and body weight are recorded as secondary measures because they are easy to obtain but do not distinguish the two fat compartments. Hormone and metabolic blood tests are collected alongside the imaging.
Available follow-up data indicate that visceral fat drifts back toward pretreatment levels once injections stop. The change is therefore best described as treatment-dependent rather than permanent. Investigators continue to debate whether intermittent or repeated courses would preserve any benefit.
It acts on the growth hormone–releasing hormone receptor, a Gs-coupled receptor found on pituitary somatotroph cells. Activation raises cAMP and prompts pulsatile hormone release.