This is a working overview of visceral fat, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-11-07. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| 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 |
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。
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。
{\displaystyle {\begin{aligned}\sigma _{xx}&=-{\frac {2}{\pi }}\int _{a}^{b}{\frac {q\left(x'\right)\left(x-x'\right)^{3}\,dx'}{\left[\left(x-x'\right)^{2}+z^{2}\right]^{2}}}~;~~\sigma _{zz}=-{\frac {2z^{2}}{\pi }}\int _{a}^{b}{\frac {q\left(x'\right)\left(x-x'\right)\,dx'}{\left[\left(x-x'\right)^{2}+z^{2}\right]^{2}}}\\[3pt]\sigma _{xz}&=-{\frac {2z}{\pi }}\int _{a}^{b}{\frac {q\left(x'\right)\left(x-x'\right)^{2}\,dx'}{\left[\left(x-x'\right)^{2}+z^{2}\right]^{2}}}\end{aligned}}}
Geckos, skinks, and some other lizards that are captured by the tail will shed part of the tail structure through a process called autotomy and thus be able to flee. The detached tail will continue to thrash, creating a deceptive sense of continued struggle and distracting the predator's attention from the fleeing prey animal. The detached tails of leopard geckos can wiggle for up to 20 minutes. The tail grows back in most species, but some, like crested geckos, lose their tails for the rest of their lives. In many species the tails are of a separate and dramatically more intense color than the rest of the body so as to encourage potential predators to strike for the tail first. In the shingleback skink and some species of geckos, the tail is short and broad and resembles the head, so that the predators may attack it rather than the more vulnerable front part. Reptiles that are capable of shedding their tails can partially regenerate them over a period of weeks. The new section will however contain cartilage rather than bone, and will never grow to the same length as the original tail. It is often also distinctly discolored compared to the rest of the body and may lack some of the external sculpting features seen in the original tail.
== Treatment == Silicosis is a permanent disease with no cure. Treatment options currently available focus on alleviating the symptoms and preventing any further progress of the condition. These include:
=== Blood supply === The liver gets its blood supply from the hepatic portal vein and hepatic arteries. The hepatic portal vein delivers around 75% of the liver's blood supply and carries venous blood drained from the spleen, gastrointestinal tract, and its associated organs. The hepatic arteries supply arterial blood to the liver, accounting for the remaining quarter of its blood flow. Oxygen is provided from both sources; about half of the liver's oxygen demand is met by the hepatic portal vein, and half is met by the hepatic arteries. The hepatic artery also has both alpha- and beta-adrenergic receptors; therefore, flow through the artery is controlled, in part, by the splanchnic nerves of the autonomic nervous system. Blood flows through the liver sinusoids and empties into the central vein of each lobule. The central veins coalesce into hepatic veins, which leave the liver and drain into the inferior vena cava.
Sources: en.wikipedia.org
3 September 1917: "With reference to a suggestion that the matter might be postponed, [Balfour] pointed out that this was a question on which the Foreign Office had been very strongly pressed for a long time past. There was a very strong and enthusiastic organisation, more particularly in the United States, who were zealous in this matter, and his belief was that it would be of most substantial assistance to the Allies to have the earnestness and enthusiasm of these people enlisted on our side. To do nothing was to risk a direct breach with them, and it was necessary to face this situation." 4 October 1917: "... [Balfour] stated that the German Government were making great efforts to capture the sympathy of the Zionist Movement. This Movement, though opposed by a number of wealthy Jews in this country, had behind it the support of a majority of Jews, at all events in Russia and America, and possibly in other countries ... Mr. Balfour then read a very sympathetic declaration by the French Government which had been conveyed to the Zionists, and he stated that he knew that President Wilson was extremely favourable to the Movement." 25 October 1917: "...
==== Breast cancer ==== The feasibility of 68Ga-Trivehexin PET imaging of breast cancer (BC) was demonstrated in a case of triple-negative BC. Another report suggested that 68Ga-Trivehexin PET/CT might offer superior detection efficacy for breast cancer compared to 18F-FDG PET/CT. Furthermore, in progesterone- and estrogen-receptor negative BC with elevated Ki67 proliferation index and strong E-cadherin, 68Ga-Trivehexin PET identified several 18F-FDG-avid lymph nodes as false positives. In a patient with lobular BC and pancreatic neuroendocrine tumor (PNET), 68Ga-Trivehexin selectively showed a PET signal only in the lobular carcinoma, while the metabolic tracer 18F-FGD and the neuroendocrine tumor tracer 68Ga-DOTATATE yielded PET signals for both the BC and PNET lesions.
6 February – Around eight million people on means tested benefits begin to receive the final scheduled cost-of-living payment from the UK government, as Sunak tells the BBC the financial pressures on households are beginning to ease. 7 February The government announces that dentists will be offered a £20,000 bonus to work in the areas of England with the poorest access to NHS care. Data published by Halifax Bank indicates that UK house prices increased by 2.5% in January 2024 when compared to the same month in 2023. The Met Office issues two amber snow warnings for the following day covering north Wales, north-west Shropshire, the Peak District and south Pennines. 8 February The UK government confirms that more than 100 school buildings containing reinforced autoclaved aerated concrete will be rebuilt or refurbished. Sir Keir Starmer insists he has no choice but to ditch Labour's £28 billion a year green investment pledge. 9 February Weather warnings remain in place as snow and rain continue to fall across the UK. Police tell reporters they believe that Abdul Shakoor Ezedi may have drowned in the River Thames, based on CCTV of the suspect at Chelsea Bridge. The Duke of Sussex settles his remaining phone hacking claims against Mirror Group Newspapers, with the newspaper agreeing to pay his legal costs along with around £300,000 in compensation. 10 February Police begin a search of the River Thames for the body of Abdul Shakoor Ezedi, the Clapham chemical attack suspect. A light aircraft crashes into the garden of a property in Bodffordd, Anglesey.
==== Granular glands ==== Granular glands can be identified as venomous and often differ in the type of toxin as well as the concentrations of secretions across various orders and species within the amphibians. They are located in clusters differing in concentration depending on amphibian taxa. The toxins can be fatal to most vertebrates or have no effect against others. These glands are alveolar meaning they structurally have little sacs in which venom is produced and held before it is secreted upon defensive behaviors. Structurally, the ducts of the granular gland initially maintain a cylindrical shape. When the ducts mature and fill with fluid, the base of the ducts become swollen due to the pressure from the inside. This causes the epidermal layer to form a pit like opening on the surface of the duct in which the inner fluid will be secreted in an upwards fashion. The intercalary region of granular glands is more developed and mature in comparison with mucous glands. This region resides as a ring of cells surrounding the basal portion of the duct which are argued to have an ectodermal muscular nature due to their influence over the lumen (space inside the tube) of the duct with dilation and constriction functions during secretions. The cells are found radially around the duct and provide a distinct attachment site for muscle fibers around the gland's body. The gland alveolus is a sac that is divided into three specific regions/layers.
Droplet-based microfluidics is differs from continuous microfluidics; droplet-based microfluidics manipulates discrete volumes of fluids in immiscible phases with low Reynolds number and laminar flow regimes. Interest in droplet-based microfluidics systems has been growing substantially in past decades. Microdroplets allow for handling miniature volumes (μL to fL) of fluids conveniently, provide better mixing, encapsulation, sorting, and sensing, and suit high throughput experiments. Exploiting the benefits of droplet-based microfluidics efficiently requires a deep understanding of droplet generation to perform various logical operations such as droplet manipulation, droplet sorting, droplet merging, and droplet breakup.
Sources: en.wikipedia.org
In July 2021, all family size limits as well as penalties for exceeding them were removed. Since abandoning population control restrictions, China has pursued pro-natalist policies in an attempt to boost the birth rate.
=== Reduced Bleeding === In vivo haemostasis efficacy studies were conducted using rat models of liver puncture and femoral artery injury. For both models, K37 and K81 (10 mg) were applied to cover the wound areas. In the liver puncture model, bleeding time significantly decreased with recombinant K37 (approximately 38 s) and K81 (approximately 40 s) compared to the vehicle alone (approximately 170 s, p < .01), with notably reduced total blood loss (p < .01). Furthermore, in the femoral artery injury model, the recombinant keratin proteins significantly reduced bleeding time compared to the control group (approximately 50 s vs. 270 s). Notably, K37 and K81 exhibited stronger haemostatic effects than extracted keratins (approximately 80 s) in treating rat liver injury. Additionally, the recombinant keratin proteins demonstrated a robust capacity to promote the formation of a fibrin clot at the injury site, effectively stopping the bleeding. Consequently, recombinant human hair keratins offer potential for developing novel haemostatic products based on keratin biomaterials.
=== Monomers and repeat units === The identity of the repeat units (monomer residues, also known as "mers") comprising a polymer is its first and most important attribute. Polymer nomenclature is generally based upon the type of monomer residues comprising the polymer. A polymer which contains only a single type of repeat unit is known as a homopolymer, while a polymer containing two or more types of repeat units is known as a copolymer. A terpolymer is a copolymer which contains three types of repeat units. Polystyrene is composed only of styrene-based repeat units, and is classified as a homopolymer. Polyethylene terephthalate, even though produced from two different monomers (ethylene glycol and terephthalic acid), is usually regarded as a homopolymer because only one type of repeat unit is formed. Ethylene-vinyl acetate contains more than one variety of repeat unit and is a copolymer. Some biological polymers are composed of a variety of different but structurally related monomer residues; for example, polynucleotides such as DNA are composed of four types of nucleotide subunits.
GSH + R• → RH + GS• → 1/2 GSSG Thiyl radicals (such as glutathionyl radicals) are themselves oxidizing species in biology, with a single-electron reduction potential sufficient for oxidation of nucleic acids, proteins and polyunsaturated lipids. Therefore, GSH itself may not be effective at direct reduction of reactive oxygen species under physiological conditions. Under oxidizing conditions, hydrogen sulfide may react with glutathione (or other electrophilic oxidized forms of glutathione) to form glutathione hydropersulfide (GS–SH), which is a superior radical-trapping antioxidant and reductant. GSH is a highly important indirect antioxidant by acting as a coenzyme for various enzymes that couple GSH-to-GSSG oxidation to the reduction of harmful oxidizing species. Such enzymes include the glutathione peroxidase family, the glutaredoxin family, the peroxiredoxin family, and others.
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.
It is a synthetic analog of growth hormone-releasing hormone, a hypothalamic peptide. It functions as a growth hormone secretagogue acting at pituitary receptors. The classification separates it from direct growth hormone products.