thymus extract raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-01-09 and is reviewed periodically as new material appears.
20世纪70年代，研究者从胸腺提取物中纯化出多种小肽，Tα1是其中被较早表征的一种。最初的制备依赖组织匀浆和层析步骤，产量低且成分复杂。随着固相肽合成技术成熟，实验室和工业界能够生产与天然序列一致的合成版本。合成肽的纯度可达95%以上，并可通过反相高效液相色谱和质谱进行鉴定。这一转变使研究不再依赖动物胸腺来源。
市售的胸腺素α1通常以冻干粉形式提供，溶解后用于注射。其氨基酸组成包括多个酸性残基，因此在中性pH下带负电荷。该肽可溶于水和生理盐水，但在有机溶剂中溶解度有限。储存条件通常为冻干状态下负20摄氏度，溶解后需冷藏并避免反复冻融。常见的同义词包括胸腺肽α1、thymalfasin和Tα1。
Immunological studies connect the peptide to multiple parts of the immune response. It has been reported to engage Toll-like receptor signaling, to promote dendritic cell maturation, and to influence the balance of T helper cell subsets. Changes in natural killer cell activity and in cytokine release appear in cell culture and animal models. These observations describe broad immunomodulatory behavior rather than a single defined receptor target, and the primary molecular interaction has not been settled.
Thymosin alpha-1 is a synthetic 28-amino-acid peptide whose sequence was first identified in extracts of bovine thymus tissue during the 1970s. The chain carries an acetyl group on its N-terminal serine. Its acidic residue content is high, which produces strong water solubility and an isoelectric point well below neutrality. Material supplied for laboratory and clinical use is manufactured by solid-phase peptide synthesis rather than purified from animal tissue. Different salt forms, such as the acetate, alter the counter-ion content without changing the peptide backbone.
Whether the free 28-residue peptide circulates in human tissue remains debated. The best-documented human source is prothymosin alpha, a larger acidic protein that carries the sequence at its N-terminus. Reports of measurable peptide levels in serum and lymphoid tissue exist, yet some of that signal may come from cross-reacting fragments or from the parent protein. Most reviews therefore treat prothymosin alpha as the established human molecule and describe independent circulation of the small peptide as an unresolved question.
| Property | Value | Notes |
|---|---|---|
| 化学分类 | 线性肽 | 由28个氨基酸组成 |
| 分子量 | 约3108 Da | 合成版本一致 |
| 外观 | 白色至类白色粉末 | 冻干品 |
| 溶解度 | 易溶于水 | 微溶于有机溶剂 |
| 储存温度 | -20°C（冻干） | 溶解后2-8°C |
Within the immune system, the peptide acts on several cell types rather than a single target. Reported activities include promotion of T-cell maturation, enhancement of natural killer cell activity, and modulation of cytokine production by dendritic cells and macrophages. Some of these effects appear to operate through toll-like receptor signaling, though the precise receptor-level mechanism remains debated. Whether the observed immune changes translate into clinical benefit is a separate question and depends on the indication studied.
The peptide was described in the 1970s as a component of thymic extracts, and early research focused on restoring immune function in immunodeficiency states. A synthetic version entered clinical development in the 1980s and is approved as a drug in several countries for conditions such as chronic hepatitis B and certain immunodeficiencies. Approval status varies widely by jurisdiction, and in the United States it is not an approved therapeutic. Regulatory and clinical positions differ, so statements about efficacy should be tied to specific indications and studies.
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.
A good example of immortal cancer cells is HeLa cells, which have been used in laboratories as a model cell line since 1951. While this method of modelling human cancer in cell culture is effective and has been used for many years by scientists, it is also very imprecise. The exact changes that allow for the formation of the tumorigenic clones in the above-described experiment are not clear. Scientists addressed this question by the serial introduction of multiple mutations present in a variety of human cancers. This has led to the identification of mutation combinations that form tumorigenic cells in a variety of cell types. While the combination varies by cell type, the following alterations are required in all cases: TERT activation, loss of p53 pathway function, loss of pRb pathway function, activation of the Ras or myc proto-oncogenes, and aberration of the Protein phosphatase 2 (PP2A). That is to say, the cell has an activated telomerase, eliminating the process of death by chromosome instability or loss, absence of apoptosis-induction pathways, and continued mitosis activation. This model of cancer in cell culture accurately describes the role of telomerase in actual human tumors. Telomerase activation has been observed in ~90% of all human tumors, suggesting that the immortality conferred by telomerase plays a key role in cancer development. Of the tumors without TERT activation, most employ a separate pathway to maintain telomere length termed Alternative Lengthening of Telomeres (ALT).
== External links == Creatine+Kinase,+MM+Form at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Human CKM genome location and CKM gene details page in the UCSC Genome Browser. Overview of all the structural information available in the PDB for UniProt: P06732 (Creatine kinase M-type) at the PDBe-KB.
=== Central Powers === Despite Balfour's warning to the War Cabinet that Germany was aiming to court Zionist support, German authorities were balancing the interests of their Zionist and non-Zionist Jewish communities (the latter represented by the Hilfsverein der Juden in Deutschland) and refrained from showing favoritism to one side or the other. They successfully urged the Ottomans to show lenience towards Zionists but were not attempting anything like an equivalent to the Balfour Declaration. The publication of the Balfour Declaration was thus met with tactical responses from the Central Powers. The participation of the Ottoman Empire in the alliance meant that Germany was unable to effectively counter the British pronouncement. Some within the German government viewed potential Zionist support for Britain's war effort as a substantial loss for their side. Two weeks following the declaration, Ottokar Czernin, the Austrian Foreign Minister, gave an interview to Arthur Hantke, President of the Zionist Federation of Germany, promising that his government would influence the Turks once the war was over.
=== 1880s === 1880: Self-taught German chemist Agnes Pockels began investigating surface tension, becoming a pioneering figure in the field of surface science. The measurement equipment she developed provided the basic foundation for modern quantitative analyses of surface films. 1880: Norwegian zoologist and malacologist Birgitte Esmark's publication on mollusks becomes the first time in Norway that a woman had a scientific work published. 1881: Italian scientists Evangelina Bottero and Carolina Magistrelli became the first women to achieve doctoral degrees in science in unified Italy. 1883: American ethnologist Erminnie A. Smith, the first female field ethnographer, published her collection of Iroquois legends Myths of the Iroquois. 1884: English zoologist Alice Johnson's paper on newt embryos became the first paper authored by a woman to appear in the Proceedings of the Royal Society. 1885: British naturalist Marian Farquharson became the first female Fellow of the Royal Microscopical Society. 1886: American botanist Emily Lovira Gregory became the first female member of the American Society of Naturalists. 1887: Rachel Lloyd became the first American woman to receive a PhD in chemistry, completing her research at the Swiss University of Zurich. 1888: Russian scientist Sofia Kovalevskaya discovered the Kovalevskaya top, one of a brief list of known rigid body motion examples that are tractable by manipulating equations by hand. 1888: Scottish astronomer Williamina Fleming discovered the Horsehead Nebula on a telescope-photogrammetry plate.
As well as preliminary rulings on the proper interpretation of EU law, an essential function of the Court of Justice is judicial review of the acts of the EU itself. Under Treaty on the Functioning of the European Union (TFEU) article 263(1) the Court can review the legality of any EU legislative of other "act" against the Treaties or general principles, such as those in the Charter of Fundamental Rights of the European Union. This includes legislation, and most other acts that have legal consequences for people. For example, in Société anonyme Cimenteries CBR Cementsbedrijven NV v Commission the commission made a decision to withdraw an assurance to a Dutch cement company that it would be immune from competition law fines, for vertical agreements. The cement company challenged the decision, and the Commission argued this was not really an "act", and so could not be challenged. The Court of Justice held a challenge could be made, and it was an act, because it "deprived [the cement company] of the advantages of a legal situation... and exposed them to a grave financial risk". Similarly in Deutsche Post v Commission the Commission demanded information on state aid given by Germany to Deutsche Post within 20 days. When both challenged this, the Commission argued that the demand for information could not be an act as there was no sanction. The Court of Justice disagreed, and held judicial review could proceed because the request produced "binding legal effects" since the information supplied or not could be relied upon as evidence in a final decision.
Sources: en.wikipedia.org
Amaninamide is a cyclic peptide. It is one of the amatoxins, all of which are found in several members of the mushroom genera Amanita, Lepiota and Galerina. It differs from alpha-amanitin in lacking the hydroxyl group on tryptophan. This alters its UV absorption spectrum but not its toxicity.
=== Modern Era, Lineup changes and Nuspojave (2015–present) === By 2015, after years of lineup changes, Bare finally assembled a stable lineup of the band once again. Guitarist Kruno Domaćinović returned to the band, along with the drummer Alen Tibljaš, keyboardist Berislav Blažević, Bassist Mario Rašić and longtime collaborator and pedal steel guitarist Davor Rodik. On 28 December 2016, the "Vrijeme Je Da Se Krene" lineup briefly reunited at the cult Zagreb alternative nightclub "Jabuka" to promote the remastered version of that album. It was the first time Bare and Kilmister spoke since 2009, as well as former drummer Chaka's first public appearance since his departure from the band in 1998. In April 2018, the band released their seventh studio album, Nuspojave ("Side Effects"), via Croatia Records. Co-written and heavily arranged by bassist Mario Rašić, the album marked a significant stylistic departure from the straight garage blues-rock of their previous records. Nuspojave introduced a slower, hypnotic, and darker sonic palette heavily influenced by krautrock and psychedelic blues. Long-form compositions like the 9-minute opening track "Ljubav krvari" and the single "Osvijesti me" received widespread critical acclaim, sweeping regional music awards and establishing a new creative direction for the band. During this period, the band transitioned into a premier arena act across the region. On November 12, 2022, they performed a major sold-out concert at Zagreb’s Dom Sportova.
{\displaystyle {\begin{aligned}t_{1/2}={\frac {N_{\text{A}}\times \ln 2}{a\times M}}&\approx {\frac {6.022\times 10^{23}{\text{ mol}}^{-1}\times 0.693}{3200{\text{ s}}^{-1}{\cdot }{\text{g}}^{-1}\times 87{\text{ g/mol}}}}\\[1ex]&\approx 1.5\times 10^{18}{\text{ s}}\approx 47{\text{ billion years}}.\end{aligned}}}
== Medical uses == Mepitiostane is used as an antiestrogen and antineoplastic agent in the treatment of breast cancer. It is also used as an AAS in the treatment of anemia of renal failure. A series of case reports have found it to be effective in the treatment of an estrogen receptor (ER)-dependent meningiomas as well.
Sources: en.wikipedia.org
它不是经典的内分泌激素，而是一种免疫调节肽。其作用主要通过局部免疫细胞间的信号传递实现，而非经血液循环作用于远隔器官。
天然胸腺素α1主要从胸腺组织提取，也可在脾脏和淋巴结中检出。目前研究和临床使用的多为化学合成版本，不再依赖动物组织。
胸腺素组分5是牛胸腺提取物的粗组分，包含多种肽。胸腺素α1是其中一种被纯化和表征的单一肽，具有明确的28个氨基酸序列。
It is usually described as an immunomodulatory peptide rather than a classic circulating hormone. No endocrine gland is known to release it as a primary secretory product, and its measured presence in blood is not firmly established.