This is a working overview of growth hormone, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
Tesamorelin is a synthetic peptide built from 44 amino acids and classified with the growth hormone–releasing hormone family. Its sequence corresponds to the human GHRH(1-44) backbone, carrying one structural change at the amino terminus. That change is a trans-3-hexenoyl group placed where the natural peptide would have an unmodified end. The modification is the feature that separates the compound from the endogenous hormone in name, in stability, and in how it is handled in the laboratory.
The hexenoyl cap slows the enzyme step that trims the amino terminus of native GHRH, the same step that shortens its active lifetime in circulation. As a result, the modified peptide persists longer in plasma than the unmodified hormone in side-by-side comparison. Receptor activity stays broadly comparable, because the added group sits away from the residues that contact the binding site. This combination, preserved receptor activity with reduced degradation, explains why the analog was developed instead of the native sequence.
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 |
|---|---|---|
| Chemical class | Synthetic peptide | GHRH analog family |
| Residue count | 44 amino acids | Matches human GHRH(1-44) backbone |
| N-terminal group | trans-3-hexenoyl | Main structural difference from native hormone |
| Appearance | White to off-white powder | Lyophilized solid form |
| Solubility class | Freely soluble in water | Peptide character; less soluble in organic solvents |
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.
Tesamorelin binds to growth hormone-releasing hormone receptors on the surface of pituitary somatotroph cells. This binding activates adenylate cyclase, raising intracellular cyclic AMP levels and triggering the release of growth hormone into circulation. The elevated growth hormone then stimulates hepatic production of insulin-like growth factor 1. Because the effect is mediated through the endogenous axis, secretion remains subject to feedback regulation. This distinguishes it from direct growth hormone administration, which bypasses pituitary control entirely.
== Research == In his research, White focused on membrane protein folding and stability, energetics of protein-bilayer interactions, experimentally determined hydrophobicity scales, translocon-assisted folding of membrane proteins, structure of fluid lipid bilayers, and MD simulations of lipid bilayers. His experimental expertise included X-ray diffraction, neutron diffraction, molecular dynamics simulations, calorimetry, physical chemistry, surface chemistry, statistical analysis of protein sequences, electrical impedance methods, planar bilayer methodology, peptide chemistry, and lipid chemistry. White’s lab determined the first fully resolved structure of a fluid lipid bilayer by combining x-ray and neutron diffraction data, and subsequently validated molecular dynamics simulations of fluid bilayers. White wrote a critical review of the principles of membrane folding and stability in 1999 that is among the ten most cited articles in Annual Review of Biophysics. Using a thermodynamic framework, he highlighted three main aspects of membrane protein folding energetics: protein binding and folding in bilayer interfaces, transmembrane helix insertion, and helix-helix interactions. In his paper “Mechanisms of Integral Membrane Protein Insertion and Folding” written in collaboration with Gunnar von Heijne, he evaluated the progress made during the past decade toward understanding translocon-assisted folding of membrane proteins and reviewed the role of basic thermodynamic principles in MP folding and assembly.
== Software Packages == Many chromatography software packages are provided by manufacturers, and many of them only provide a simple interface to acquire data. They also provide different tools to analyze this data. The following is a list of software and the (unexplained) tools that each provides. Please note that some of them were discontinued with the years.
==== Ethanol drench ==== The alcohol used to clean the area to be branded as well as the alcohol in the coolant bath must have purities of 99%. This is because additives like water or iodine tend to create an alcohol slush at very cold temperatures. This slush is both an ineffective antiseptic and a very poor conductor of heat.
== Epidemiology == PMOS is the most common hormonal disorder (endocrine disorder) among women of reproductive age. When someone is infertile due to a lack of ovulation, PMOS is the most common cause. According to the World Health Organization (WHO), PMOS affects over 6 to 13% of reproductive-aged women. A 2022 review noted a prevalence between 5% and 18%. The prevalence of PMOS depends on the choice of diagnostic criteria. Using the Rotterdam criteria, around 10–13% of women have PMOS. Based on the NIH criteria, the global prevalence was 5.5%, increasing to approximately 7.1% when using the Androgen Excess Society criteria. Irrespective of the criteria, the prevalence of PMOS is increasing, likely due to an aging population, more awareness, and increasing obesity rates. Prevalence seems fairly even among people with different ethnicities, but may be higher in people from Southeast Asia and the Eastern Mediterranean. But PMOS can express differently. For instance, in African and Hispanic American people with PMOS, there is more insulin resistance compared to other ethnic groups. The same is true for South Asian people with PMOS, who also have more metabolic symptoms and higher BMIs. East Asian women typically have less hirsutism and lower BMI compared to other groups. While early small-scale studies found that transmasculine people were more likely to have PMOS than cis women, this was not found in a larger, more rigorous study.
Sources: en.wikipedia.org
=== Community === Outback Steakhouse has a program to support the communities in which its restaurants are located. They have also joined GroupRaise, a platform where non-profits can book restaurant fundraisers in their locations. On a national level, Outback partners with Heineken USA and their Heineken with a Heart program to raise funds for various organizations in these communities.
=== May 2005 === A Pentagon order is mentioned in a military report filed on May 16, 2005 ordering U.S. personnel to turn a blind eye to Iraqi torture by refraining from investigating instances of apparent detainee abuse by Iraqi personnel, unless the investigation is first approved by U.S. headquarters: "Provided the initial report confirms US forces were not involved in the detainee abuse, no further investigation will be conducted unless directed by HHQ." Such approval was rarely granted.
=== Photosynthesis === Submerged aquatic plants have more restricted access to carbon as carbon dioxide compared to terrestrial plants. They may also experience reduced light levels. In aquatic plants diffuse boundary layers (DBLs) around submerged leaves and photosynthetic stems vary based on the leaves' thickness, shape and density and are the main factor responsible for the greatly reduced rate of gaseous transport across the leaf/water boundary and therefore greatly inhibit transport of carbon dioxide. To overcome this limitation, many aquatic plants have evolved to metabolise bicarbonate ions as a source of carbon. Environmental variables affect the instantaneous photosynthetic rates of aquatic plants and the photosynthetic enzymes pigments. In water, light intensity rapidly decreases with depth. Respiration is also higher in the dark per the unit volume of the medium they live in.
== Distribution and habitat == Considered to be a least-concern species according to the International Union for Conservation of Nature, the coastal taipan occurs in northern Australia and southern New Guinea. Its range extends from north-western Western Australia, the Northern Territory, across Cape York Peninsula, and south in eastern Queensland into northern New South Wales (as far south as Grafton). The coastal taipan, though, is not found in regions where the maximum winter temperature is below 20 °C (68 °F). The second subspecies (O. s. canni ) is found throughout the island of New Guinea, with higher concentrations of the snake being found in the nation of Papua New Guinea. The coastal taipan can be found in a variety of different habitats, in warm, wetter, temperate to tropical coastal regions, monsoon forests, wet and dry sclerophyll forests and woodlands, and natural and artificial grassy areas, including grazing paddocks and disused rubbish tips. It appears to have become more common since the 1935 introduction of the cane toad. Whether this is because of reduced competition, as other large venomous snakes have declined after being poisoned by toads, or due to increased food supply of rodents is unclear. It has adapted well to sugarcane fields, where it thrives on the rodent population in the fields. In Far North Queensland in the Cape York Peninsula, it is usually found in open woodland areas. Thickets of introduced Lantana are also favoured habitat. The coastal taipan shelters in abandoned animal burrows, hollow logs, and piles of vegetation and litter.
On 25 June, a woman was killed and a child was wounded in a mortar strike on a house in Bannu District and four were killed in a TTP attack on an ambulance. Four TTP militants were killed in a military operation in Bannu District, two in Bajaur District and an operation was also conducted in Karak District. A TTP drone strike in South Waziristan killed three people. On 26 June, a militant faction in Pishin district joined JuA. A Chitral Scouts personnel was killed in a drone strike on Orson Post 3337 at the Afghanistan border. An FC soldier and a TTP insurgent were killed in two separate engagements in Tank District. Seven insurgents were killed in a military operation in Bannu District. A soldier was killed in an engagement in South Waziristan whereas two militants were killed by Al-Buraq Division in D.I. Khan District. On 27 June, three Rangers personnel were killed in a JuA attack on a Rangers installment in Karachi. On 28 June, Pakistan carried out a "ground operation" and launched airstrikes in eastern Afghanistan targeting Paktia, Paktika and Kunar provinces. Afghanistan spokesperson Zabihullah Mujahid condemned the action and claimed that the attacks resulted in the deaths and injuries of dozens of civilians, including women and children. Taliban officials later told BBC Pashto that at least 100 people were killed or wounded. The combined casualties from both the ground operation and aerial strikes were 36 deaths and 160 wounded according to official figures.
Sources: en.wikipedia.org
During sexual arousal, the clitoris and the rest of the vulva engorge and change color as the erectile tissues fill with blood (vasocongestion), and the individual experiences vaginal contractions. The ischiocavernosus and bulbocavernosus muscles, which insert into the corpora cavernosa, contract and compress the dorsal vein of the clitoris (the only vein that drains the blood from the spaces in the corpora cavernosa), and the arterial blood continues a steady flow and having no way to drain out, fills the venous spaces until they become turgid and engorged with blood. This is what leads to clitoral erection. The prepuce has retracted and the glans becomes more visible. The glans doubles in diameter upon arousal and further stimulation becomes less visible as it is covered by the swelling of the clitoral hood. The swelling protects the glans from direct contact, as direct contact at this stage can be more irritating than pleasurable. Vasocongestion eventually triggers a muscular reflex, which expels the blood that was trapped in surrounding tissues, and leads to an orgasm. A short time after stimulation has stopped, especially if orgasm has been achieved, the glans becomes visible again and returns to its normal state, with a few seconds (usually 5–10) to return to its normal position and 5–10 minutes to return to its original size. If orgasm is not achieved, the clitoris may remain engorged for a few hours, which women often find uncomfortable. Additionally, the clitoris is very sensitive after orgasm, making further stimulation initially painful for some women.
It is not understood whether the physical opening of the L-type calcium channels or the presence of calcium causes the ryanodine receptors to open. The outflow of calcium allows the myosin heads access to the actin cross-bridge binding sites, permitting muscle contraction. Muscle contraction ends when calcium ions are pumped back into the sarcoplasmic reticulum, allowing the contractile apparatus and, thus, muscle cell to relax. Upon muscle contraction, the A-bands do not change their length (1.85 micrometer in mammalian skeletal muscle), whereas the I-bands and the H-zone shorten. This causes the Z-lines to come closer together.
Three of the entrances took the form of free-standing pavilions or small stations, including waiting rooms: one at Bastille and two on Avenue de Wagram at Étoile. These were in a style influenced by Japanese pagodas. At Étoile Guimard provided exterior doors for elevators, although the elevators were not built. Eight simpler but still elaborate structures, labeled "Édicule B" by Guimard, were installed at the termini of Line 1 as originally opened and at two other major stations. These consisted of three-sided glass-roofed structures enclosing the stairway, with a projecting canopy. A variation on this format, "Édicule A", lacked the canopy and was erected at two stations, Saint-Paul and Reuilly–Diderot. These édicule types of entrance, which have come to be called libellules because they resemble dragonflies, in some cases had decorated wall panels surfaced in reconstituted lava. The great majority of the entrances built (154) were unroofed enclosures, dubbed an entourage. A transitional form between the entourage and the édicule, railings with a roof and canopy, was used for one entrance at the Gare de Lyon metro station. At many of the entourages, the top of the steps is surmounted by a "Métropolitain" or "Métro" sign in a holder that extends between two risers in the form of sinuous stalks, traditionally compared to lily of the valley (brin de muguet), each bearing a light in the form of a red-orange globe reminiscent of an eye or a flower.
=== Parallel MRI === It takes time to gather MRI data using sequential applications of magnetic field gradients. Even for the most streamlined of MRI sequences, there are physical and physiologic limits to the rate of gradient switching. Parallel MRI circumvents these limits by gathering some portion of the data simultaneously, rather than in a traditional sequential fashion. This is accomplished using arrays of radiofrequency (RF) detector coils, each with a different 'view' of the body. A reduced set of gradient steps is applied, and the remaining spatial information is filled in by combining signals from various coils, based on their known spatial sensitivity patterns. The resulting acceleration is limited by the number of coils and by the signal to noise ratio (which decreases with increasing acceleration), but two- to four-fold accelerations may commonly be achieved with suitable coil array configurations, and substantially higher accelerations have been demonstrated with specialized coil arrays. Parallel MRI may be used with most MRI sequences. After a number of early suggestions for using arrays of detectors to accelerate imaging went largely unremarked in the MRI field, parallel imaging saw widespread development and application following the introduction of the simultaneous acquisition of spatial harmonics (SMASH) technique in 1996–7. The sensitivity encoding (SENSE) and generalized autocalibrating partially parallel acquisitions (GRAPPA) techniques are the parallel imaging methods in most common use today.
Sources: en.wikipedia.org
No. It is a peptide that acts upstream of growth hormone release, while growth hormone is the hormone itself. The two differ in size, in receptor, and in how the body clears them.
It blocks the amino-terminal degradation step that limits native GHRH. The addition extends how long the peptide survives in plasma without removing its ability to activate the receptor.
The chain contains 44 amino acid residues. It matches the human GHRH(1-44) sequence apart from the amino-terminal modification.
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。