Everything below concerns 细胞因子. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-03-16. Numbers and descriptions here follow the published literature rather than marketing material.
Thymosin beta-4 is a separate 43-residue peptide that binds actin and participates in cell migration; it shares no sequence similarity with thymosin alpha-1 despite the common family name. Other preparative materials, such as thymosin fraction 5 and thymopoietin, contain distinct mixtures or peptides. The shared thymosin label reflects the tissue of origin used in early purification, not a common structural core. Treating these molecules as interchangeable is a frequent source of confusion in laboratory reports and in popular summaries alike.
Thymosin alpha-1 is a synthetic peptide of 28 amino acid residues that corresponds to a naturally occurring fragment first isolated from thymus tissue. Its chain is acetylated at the amino terminus, a modification that shields the peptide from rapid cleavage by aminopeptidases. The molecule carries a net negative charge at physiological pH and dissolves freely in water. Researchers classify it as an immune-modulating agent rather than a classical hormone, because it acts on several cell types of both the innate and the adaptive immune system.
The peptide was identified during work in the 1970s on thymosin fraction 5, a partially purified extract of calf thymus. Investigators separated that mixture and characterized individual components, one of which they named thymosin alpha-1. The same compound later received the international nonproprietary name thymalfasin. Commercial material is produced by solid-phase peptide synthesis rather than by extraction, so synthetic and natural forms share an identical sequence. Naming conventions vary across the literature, and readers should distinguish the alpha-1 peptide from other thymosins that have unrelated sequences and functions.
在信号层面，Tα1可能通过Toll样受体等模式识别受体发挥作用。部分实验显示，它能激活髓样分化因子88依赖的通路，进而促进核因子κB进入细胞核。这导致白细胞介素2、干扰素γ和白细胞介素12等细胞因子的转录增加。这些细胞因子偏向辅助性T细胞1型应答，有助于细胞免疫。然而，具体受体和结合位点尚未完全确定，不同实验模型的结果存在差异。
临床研究将Tα1用于慢性病毒感染、肿瘤辅助治疗和疫苗佐剂等场景。部分试验报告了免疫学指标改善，但临床终点获益在不同研究中并不一致。系统综述指出，研究间在人群、剂量和联合方案上差异较大，难以汇总结论。因此，Tα1的确切临床地位仍属开放问题，需要更多高质量随机对照试验来澄清。其机制研究也需从体外实验向体内模型推进。
胸腺素α1对免疫系统的影响涉及多种细胞类型。研究表明，它可促进未成熟T细胞向成熟T细胞分化，并增强T细胞对抗原刺激的增殖反应。树突状细胞在Tα1存在下表达更高水平的共刺激分子，从而更有效地呈递抗原。此外，自然杀伤细胞的活性也观察到上升。这些效应并非直接杀伤病原体，而是调节宿主免疫应答的强度与方向。
| Property | Value | Notes |
|---|---|---|
| Molecular mass | About 3.1 kDa | 28 residues, N-terminally acetylated |
| Appearance | White to off-white powder | Lyophilized solid |
| Solubility | Freely soluble in water | Also soluble in aqueous buffers |
| Storage temperature | 2 to 8 °C | Protect from light and moisture |
| Common synonyms | Thymalfasin; Tα1 | Same peptide sequence |
== Ministries held == After the elections to the Grand National Assembly and the declaration of Bulgaria as a republic, Georgiev stepped down from the premiership at the request of Communist Party leader Georgi Dimitrov. Dimitrov had effectively been leading the country since the monarchy was abolished in September. In the second government of Georgi Dimitrov of 12 December 1947 he was removed from the Foreign Ministry and became Minister of Electrification and Land Reclamation, remaining in this post until 1959, after which he briefly served as Chairman of the Committee on Construction and Architecture. He was Deputy Prime Minister until 1950 and again in 1959–1962. Kimon Georgiev was expelled from the country's political leadership, which was placed under the full control of the Bulgarian Communist Party. At the same time, as Minister of Electrification, he played an important role, as the construction of the power industry was key to the Communists' policy of massive industrialization. Between 1947 and 1959, electricity production increased more than sixfold, and numerous power plants, dams and transmission facilities were built. In 1948, after the revocation of Damyan Velchev's Bulgarian citizenship, the State Security started a secret investigation against Georgiev. This took place in the context of growing tensions between Yugoslavia and the Soviet bloc, and Georgiev was known for his long-standing position in favour of friendly relations between Yugoslavia and Bulgaria.
Sambhunath De ; (1 February 1915 – 15 April 1985) was an Indian medical scientist and researcher, who discovered the cholera toxin, the animal model of cholera, and successfully demonstrated the method of transmission of cholera pathogen Vibrio cholerae.
== Versions == There are currently six varieties of TMT available: TMTzero, a non-isotopically substituted core structure; TMTduplex, an isobaric pair of mass tags with a single isotopic substitution; TMTsixplex, an isobaric set of six mass tags with five isotopic substitutions; TMT 10-plex – a set of 10 isotopic mass tags which use the TMTsixplex reporter region, but use different elemental isotope to create a mass difference of 0.0063 Da, TMTpro a 16 plex version with a different reporter and mass normalizer than the original TMT, and TMTpro Zero.
== Aims == Xenobiology has the potential to reveal fundamental knowledge about biology and the origin of life. In order to better understand the origin of life, it is necessary to know why life evolved seemingly via an early RNA world to the DNA-RNA-protein system and its nearly universal genetic code. Was it an evolutionary "accident" or were there constraints that ruled out other types of chemistries? By testing alternative biochemical "primordial soups", it is expected to better understand the principles that gave rise to life as we know it. Xenobiology is an approach to develop industrial production systems with novel capabilities by means of biopolymer engineering and pathogen resistance. The genetic code encodes in all organisms 20 canonical amino acids that are used for protein biosynthesis. In rare cases, special amino acids such as selenocysteine or pyrrolysine can be incorporated by the translational apparatus into the proteins of some organisms. Together, these 20+2 Amino Acids are known as the 22 Proteinogenic Amino Acids. By using additional amino acids from among the over 700 known to biochemistry, the capabilities of proteins may be altered to give rise to more efficient catalytical or material functions. The EC-funded project Metacode, for example, aims to incorporate metathesis (a useful catalytical function so far not known in living organisms) into bacterial cells. Xenobiology could also potentially improve production processes by reducing the risk of viral or bacteriophage contamination in cultivations.
Sources: en.wikipedia.org
Selenium, in the form of organoselenium compounds, is an essential micronutrient whose absence from the diet causes cardiac muscle and skeletal dysfunction. Organoselenium compounds are required for cellular defense against oxidative damage and for the correct functioning of the immune system. They may also play a role in prevention of premature aging and cancer. The source of Se used in biosynthesis is selenophosphate. Glutathione oxidase is an enzyme with a selenol at its active site. Organoselenium compounds have been found in higher plants. For example, upon analysis of garlic using the technique of high-performance liquid chromatography combined with inductively coupled plasma mass spectrometry (HPLC-ICP-MS), it was found that γ-glutamyl-Se-methylselenocysteine was the major Se-containing component, along with lesser amounts of Se-methylselenocysteine. Trace quantities of dimethyl selenide and allyl methyl selenide are found in human breath after consuming raw garlic. Indeed, organoselenium compounds have a terrible smell.
=== Legal status === Icatibant received orphan drug status in Australia, the EU, Switzerland, and the US for the treatment of hereditary angioedema (HAE). In the EU, the approval by the European Commission (July 2008) allows Jerini to market Firazyr in the European Union's 27 member states, as well as Switzerland, Liechtenstein and Iceland, making it the first product to be approved in all EU countries for the treatment of hereditary angioedema. In the US, the drug was granted FDA approval in August 2011.
interphase All stages of the cell cycle excluding cell division. A typical cell spends most of its life in interphase, during which it conducts everyday metabolic activities as well as the complete replication of its genome in preparation for mitosis or meiosis.
=== Anaerobic extended glycolysis === A number of anaerobic eukaryotes have acquired the ability to perform extended hydrolysis. The prototypical example is the hydrogenosome, but there are also transitional H2-producing mitochondria with this function. This process requires:
== Products == In Germany and Austria, spelt loaves and rolls (Dinkelbrot) are widely available in bakeries. The unripe spelt grains are dried and eaten as Grünkern ("green grain"). In Australia it is grown organically for the health food market. Dutch jenever makers sometimes distil with spelt, while beer brewed from spelt exists in Bavaria and Belgium.
Sources: en.wikipedia.org
She eventually succeeded in purifying components of the coat that were not clathrin and are now known as adaptor proteins. These proteins sit between clathrin, which forms the vesicle's outer shell and also the vesicle membrane. Continuing, Margaret discovered that there were two different populations of clathrin-coated vesicles, one that uses AP-2 at the plasma membrane and one that uses AP-1 and was associated with intracellular membranes. AP-1 and AP-2 are both heterotetramers with related subunits. They both have two large subunits and the other subunit is closely related in AP-1 and AP-2.
Somapacitan, sold under the brand name Sogroya, is a growth hormone medication. Somapacitan is a human growth hormone analog. Somapacitan-beco is produced in Escherichia coli by recombinant DNA technology. The most common side effects include: back pain, joint pain, indigestion, a sleep disorder, dizziness, tonsillitis, swelling in the arms or lower legs, vomiting, adrenal insufficiency, hypertension, increase in blood creatine phosphokinase (a type of enzyme), weight increase, and anemia. It was approved for medical use in the United States in August 2020, and in the European Union in March 2021. Somapacitan is the first human growth hormone (hGH) therapy that adults only take once a week by injection under the skin; other FDA-approved hGH formulations for adults with growth hormone deficiency must be administered daily. It contains a small non-covalent moiety that reversibly binds to serum albumin which slows down elimination.
=== Ministry of Finance === Horacio Cartes picked Peña to replace Germán Rojas as finance minister in 2015, following Rojas's resignation on personal grounds. As Peña took office, Cartes described him as a "bright young man" who would reinvigorate Paraguay's economy in the face of low global soy prices and a slow regional export market. As Minister of Finance in 2016 and 2017, Peña promoted the project to create the Superintendency of Retirements and Pensions. Peña indicated, “There have already been situations of embezzlement with the case of the Pension Fund of the Binational Itaipú (Cajubi).” The Itaipu Retirement and Pension Fund (Cajubi) and the Itaipu Workers' Union (STEIBI) opposed the project. In a joint press conference in November 2016, the two groups stated that they saw the plan as an “unconstitutional” violation, further describing the proposed legislation as “an imminent danger from a greedy person, who is looking for ways to extract money from people and who is the Minister of Finance.” On May 17, 2018, Cajubi's director and legal advisor, Adelio Dolores Aquino, presented Cajubi's position against the creation of a Superintendency on the TV Unicanal's program Sin Vueltas. As President, Peña continued to advocate for the creation of the Superintendency of Retirement and Pensions, arguing that it was necessary to prevent problems like the Cajubi case.
== Treatments == Cellulite can be resistant to a variety of treatments. Aside from "topical" products (creams, ointments) and injectables (collagenase), treatments for cellulite include non-invasive therapy such as mechanical suction or mechanical massage. Energy-based devices include radio frequency with deep penetration of the skin, ultrasound, cryotherapy chambers, laser and pulsed-light devices. Combinations of mechanical treatments and energy-based procedures are widely used. Ionithermie, a form of electrotherapy using electrical muscle stimulation, has been described as ineffective. More invasive 'subcision' techniques utilize a needle-sized microscalpel to cut through the causative fibrous bands of connective tissue. Subcision procedures (manual, vacuum-assisted, or laser-assisted) are performed in specialist clinics with patients given local anaesthetic.
Sources: en.wikipedia.org
It is a 28-residue synthetic peptide studied as an immune-modulating agent and approved as a drug in some countries. The sequence matches a naturally occurring fragment isolated from thymus tissue. It is not a hormone in the endocrine sense.
The name traces back to thymosin fraction 5, a crude thymus extract examined in the 1970s. Individual peptides in that mixture were labeled with Greek letters, and alpha-1 was one of them. The international nonproprietary name thymalfasin was assigned later.
No. Thymosin beta-4 contains 43 residues and binds actin, while thymosin alpha-1 contains 28 residues and acts on immune cells. The two sit in a historical naming group but share no sequence similarity, and they are not substitutes for one another.
它促进未成熟T细胞分化并增强成熟T细胞的增殖与细胞因子分泌。这些作用有助于放大抗原特异性免疫应答。