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.
Reviewed 2026-02-28. Anything still debated is marked as such rather than presented as settled.
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.
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.
Metabolic interest in this compound centers on fat distribution rather than on hormone levels alone. Imaging trials in adults with excess abdominal fat report reductions in visceral adipose tissue, while subcutaneous depots change comparatively little. Growth hormone and IGF-1 are presumed to carry the effect, but the separate contribution of each is not firmly established. Whether these changes persist after treatment stops, and whether they alter longer-term health outcomes, remain open questions that published work does not answer consistently.
Tesamorelin is a synthetic peptide of forty-four amino acids whose sequence reproduces human growth hormone-releasing hormone. Its distinguishing feature sits at the amino terminus, where a trans-3-hexenoyl group replaces the free amine. That acylation slows cleavage by dipeptidyl peptidase IV, an enzyme that otherwise removes the first two residues and inactivates the natural hormone quickly. The modified peptide therefore persists longer in circulation while keeping the same receptor target. It is handled as a lyophilized solid and dissolved shortly before use.
| 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 |
Storage claims vary across suppliers, and published stability data for specific formulations are limited. Extrapolating from related peptides is common but not a substitute for direct measurement. For research use, documentation such as a certificate of analysis is often requested to confirm identity and purity. What constitutes an acceptable purity threshold depends on the intended application. Open questions remain about how temperature excursions during shipping affect long-term peptide integrity. Independent verification by an end user is not routinely reported.
Lyophilized tesamorelin is generally stored refrigerated at 2 to 8 degrees Celsius, protected from light and moisture. Peptides in this class are often kept frozen at minus 20 degrees Celsius for longer periods. Reconstituted solutions are typically used within a defined window because hydrolysis and oxidation proceed faster in liquid form. Container material and headspace also influence how long a preparation retains its expected profile. Specific stability figures depend on concentration and buffer composition.
Development work on the compound, originally designated TH9507, focused on conditions in which reduced growth hormone signaling is thought to contribute to altered body composition. The United States Food and Drug Administration approved it in 2010 for the treatment of excess visceral abdominal fat in adults with human immunodeficiency virus infection and lipodystrophy. Later research examined other populations, including adults with mild cognitive impairment, where a large trial did not meet its primary endpoints. This mixed record illustrates how a single mechanism can produce clear effects in one setting and inconclusive results in another.
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.
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.
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。
特沙莫瑞林是一种合成肽，其序列与人生长激素释放激素的 44 个氨基酸形式相关。它在 N 端带有反式-3-己烯酰基修饰，这一改动可减缓二肽基肽酶 IV 的降解。该化合物属于生长激素释放激素受体激动剂，可刺激垂体释放生长激素。研究文献通常将其归入合成肽类药物，而非小分子化合物。
==== Benzoctamine and sodium amylobarbitone ==== In a study used to compare benzoctamine to sodium amylobarbitone as a sleep promoter, it was found that during administration of both drugs, patients reported that their sleep was less restless, and drowsiness was diminished. The study further showed that while sodium amylobarbitone caused withdrawal rebound symptoms, benzoctamine did not. It was also found that benzoctamine reduced plasma corticosteroid hormone levels. There is a relationship between anxiety and adreno-corticosteroid activity, with raised levels commonly being reported as an indication of stress. The study showed that benzoctamine, a drug reported to reduce anxiety, was also able to reduce the hormones that potentially cause it. This points to a phenomenon often seen within pharmacology where drugs intended for other uses often have far-reaching and rarely considered effects.
When asked at trial why she had not spoken against the ongoing physical, emotional, and sexual abuse she had endured for seven years before running away from home when she was aged 15, Anna Marie emphasised that, as a child and adolescent, she had not known any other normality, adding, "[My father and stepmother] were all I had." Fred's younger brother, John, hanged himself in the garage of his Gloucester home in November 1996. At the time of his suicide, he had been awaiting the jury verdict in his trial for the alleged multiple rapes of his niece, Anna Marie, and another underage girl at Cromwell Street in the 1970s. The Wests' son Stephen is also known to have made a suicide attempt by hanging in 2002. In 2004 he was jailed for nine months for having unlawful sex with a 14-year-old girl on multiple occasions. Another of the West children, Barry, took his own life via a suspected drug overdose in October 2020 at the age of 40. For several years prior to his death, he is known to have battled a drug addiction and psychiatric problems as a result of the abuse he had endured and witnessed, including the murder of his sister Heather, as a child. The Wests' house in Cromwell Street was demolished in October 1996, with every piece of debris destroyed to discourage potential souvenir hunters. It had been referred to in the press as the "House of Horrors." The site was later redeveloped into a public pathway. As of May 2026, Rose remains incarcerated at New Hall jail, in Wakefield, West Yorkshire, where she maintains her innocence.
==== Altered fat-soluble vitamin metabolism ==== Preformed vitamin A is fat-soluble and high levels have been reported to affect the metabolism of the other fat-soluble vitamins D, E, and K. The toxic effects of preformed vitamin A might be related to altered vitamin D metabolism, concurrent ingestion of substantial amounts of vitamin D, or binding of vitamin A to receptor heterodimers. Antagonistic and synergistic interactions between these two vitamins have been reported, as they relate to skeletal health. Stimulation of bone resorption by vitamin A has been reported to be independent of its effects on vitamin D.
anticodon A series of three consecutive nucleotides within a transfer RNA which complement the three nucleotides of a codon within an mRNA transcript. During translation, each tRNA recruited to the ribosome contains a single anticodon triplet that pairs with its complementary codon from the mRNA sequence, allowing each codon to specify a particular amino acid to be added to the growing peptide chain. Anticodons containing inosine in the first position are capable of pairing with more than one codon due to a phenomenon known as wobble base pairing.
Secondary structure prediction is a set of techniques in bioinformatics that aim to predict the local secondary structures of proteins based only on knowledge of their amino acid sequence. For proteins, a prediction consists of assigning regions of the amino acid sequence as likely alpha helices, beta strands (often termed extended conformations), or turns. The success of a prediction is determined by comparing it to the results of the DSSP algorithm (or similar e.g. STRIDE) applied to the crystal structure of the protein. Specialized algorithms have been developed for the detection of specific well-defined patterns such as transmembrane helices and coiled coils in proteins. The best modern methods of secondary structure prediction in proteins were claimed to reach 80% accuracy after using machine learning and sequence alignments; this high accuracy allows the use of the predictions as feature improving fold recognition and ab initio protein structure prediction, classification of structural motifs, and refinement of sequence alignments. The accuracy of current protein secondary structure prediction methods is assessed in weekly benchmarks such as LiveBench and EVA.
Sources: en.wikipedia.org
continuity (conservation of mass), conservation of linear momentum, conservation of angular momentum, conservation of energy. The study of fluids is fluid mechanics, which is subdivided into fluid dynamics and fluid statics depending on whether the fluid is in motion.
is the difference in the lower energy levels involved in the transitions for the lines being probed. Another way to measure the temperature is by relating the FWHM of the probed absorption line to the Doppler line width of the species at that temperature. This is given by,
A unique identifier assigned by the investigator to each trial subject to protect the subject's identity and used in lieu of the subject's name when the investigator reports adverse events and/or other trial-related data. (ICH E6) Subject/Trial Subject
Vegetable oils such as castor oil are typically unattractive alternatives to petroleum-derived lubricants because of their poor oxidative stability. Castor oil has better low-temperature viscosity properties and high-temperature lubrication than most vegetable oils, making it useful as a lubricant in jet, diesel, and racing engines. The viscosity of castor oil at 10 °C (50 °F) is 2,420 centipoise, but it tends to form gums in a short time, so its usefulness is limited to engines that are regularly rebuilt, such as racing engines. Lubricant company Castrol took its name from castor oil. Castor oil has been suggested as a lubricant for bicycle pumps because it does not degrade natural rubber seals.
The science of blood transfusion dates to the first decade of the 20th century, with the discovery of distinct blood types leading to the practice of mixing some blood from the donor and the receiver before the transfusion (an early form of cross-matching). In the early 19th century, British obstetrician James Blundell made efforts to treat hemorrhage by transfusion of human blood using a syringe. In 1818, after experiments with animals, he performed the first successful transfusion of human blood to treat postpartum hemorrhage at Guy's Hospital in London. Blundell used the patient's husband as a donor, and extracted four ounces of blood from his arm to transfuse into his wife. During the years 1825 and 1830, Blundell performed 10 transfusions, five of which were beneficial, and published his results. He also invented a number of instruments for the transfusion of blood. He made a substantial amount of money from this endeavour, roughly $2 million ($50 million real dollars). In 1840, Samuel Armstrong Lane, aided by Blundell, performed the first successful whole blood transfusion to treat haemophilia at St George's Hospital Medical School in London. However, early transfusions were risky and many resulted in the death of the patient. By the late 19th century, blood transfusion was regarded as a risky and dubious procedure, and was largely shunned by the medical establishment. Work to emulate James Blundell continued in Edinburgh. In 1845 the Edinburgh Journal described the successful transfusion of blood to a woman with severe uterine bleeding.
Sources: en.wikipedia.org
cell physiology The study of the various biological activities and biochemical processes which sustain life inside cells, particularly (but not necessarily limited to) those related to metabolism and energy transfer, growth and reproduction, and the ordinary processes of the cell cycle.
It launched in 1990 by the Brazilian Workers' Party in São Paulo, after the Workers' Party approached other parties and social movements of Latin America and the Caribbean with the objective of debating the new international scenario after the fall of the Berlin Wall and the consequences of the implementation of what were taken as neoliberal policies adopted at the time by contemporary right-leaning governments in the region, with the stated main objective of the conference being to argue for genuine alternatives to neoliberalism. Among its members, it includes democratic socialist and social democratic parties in the region such as Bolivia's Movement for Socialism, Brazil's Workers' Party, the Ecuadorian PAIS Alliance, the Venezuelan United Socialist Party of Venezuela, the Socialist Party of Chile, the Uruguayan Broad Front, the Nicaraguan Sandinista National Liberation Front and the Salvadoran Farabundo Martí National Liberation Front. Former members included the Brazilian Socialist Party and the Popular Socialist Party. In Venezuela, Hugo Chávez was re-elected in October 2012 for his third six-year term as president, but he suddenly died in March 2013 from advanced cancer. After Chávez's death, Nicolás Maduro, the Vice President of the United Socialist Party of Venezuela (PSUV), assumed the powers and responsibilities of the president on 5 March 2013. A special presidential election was held the following which Maduro won by a tight margin as the PSUV's candidate. He was formally inaugurated on 19 April 2013.
Therapeutic touch (TT), or non-contact therapeutic touch (NCTT), also generically called healing touch, is a pseudoscientific energy therapy which practitioners claim promotes healing and reduces pain and anxiety. "Therapeutic Touch" is a registered trademark in Canada for the "[s]tructured and standardized healing practice performed by practitioners trained to be sensitive to the receiver's energy field that surrounds the body;...no touching is required." Practitioners of therapeutic touch state that by placing their hands on, or near, a patient, they are able to detect and manipulate what they say is the patient's energy field. One highly cited study, designed by the then-nine-year-old Emily Rosa and published in the Journal of the American Medical Association in 1998, found that practitioners of therapeutic touch could not detect the presence or absence of a hand placed a few inches above theirs when their vision was obstructed. Simon Singh and Edzard Ernst concluded in their 2008 book Trick or Treatment that "the energy field was probably nothing more than a figment in the imaginations of the healers". The American Cancer Society noted, "Available scientific evidence does not support any claims that TT can cure cancer or other diseases." A 2004 Cochrane review found no good evidence that it helped with wound healing, but the authors withdrew it in 2016 out of "serious concerns over the validity of included studies".
== Etymology == The word vacuum comes from Latin 'an empty space, void', noun use of neuter of vacuus, meaning "empty", related to vacare, meaning "to be empty". Vacuum is one of the few words in the English language that contains two consecutive instances of the vowel u.
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.
The amino acid sequence matches human growth hormone-releasing hormone, but the amino terminus carries a trans-3-hexenoyl group instead of a free amine. That single structural change chiefly affects enzymatic stability rather than receptor selectivity.