Thymosin alpha 1 is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-04-12. Where a claim depends on a specific study, the study is described rather than over-claimed.
Thymosin alpha 1 is a synthetic 28-amino-acid peptide first isolated in 1966 from thymosin fraction 5, a bovine thymus extract. Its chain begins with an acetylated serine residue and ends with asparagine. The native peptide carries a molecular mass near 3,108 daltons. Researchers classify it as an immunomodulatory agent rather than a hormone with a single endocrine target. Early work framed it as a thymus-derived factor that supports T-cell maturation. The synthetic form used in research and clinical products matches the natural sequence.
Immune signaling studies link thymosin alpha 1 to Toll-like receptor pathways, particularly TLR2 and TLR9, on dendritic cells and other antigen-presenting cells. Activation of these receptors promotes maturation of T cells and increases natural killer cell activity. The peptide shifts cytokine output toward a T helper 1 profile, raising interferon gamma and interleukin 2 while modulating interleukin 10. Whether these effects translate into clinical benefit for any specific disease remains a subject of debate. Reported outcomes vary across trials and populations.
The lyophilized peptide is generally stable for extended periods when kept cold and dry. Once dissolved, aqueous solutions are less stable; hydrolysis, oxidation, and aggregation can degrade the material. Storage at -20 °C or lower slows these processes. Repeated freeze-thaw cycles are best avoided because they can promote aggregation. The exact shelf life depends on formulation, pH, and concentration, so stability studies are typically performed for each specific product.
Quality control for thymosin alpha-1 focuses on identity, purity, and potency. Identity is confirmed by mass spectrometry and amino acid analysis, while purity is assessed by chromatography with limits on related substances and residual solvents. Potency assays may use cell-based immune readouts, but these are not standardized across laboratories. Regulatory status differs by jurisdiction; no product is approved in the United States for clinical use, whereas some other countries register injectable forms for specific indications.
| Property | Value | Notes |
|---|---|---|
| Molecular mass | ≈3,108 Da | Synthetic 28-residue peptide |
| Amino acid count | 28 | N-terminal serine carries an acetyl group |
| Appearance | White to off-white powder | Lyophilized solid |
| Water solubility | Freely soluble | Dissolves in aqueous buffer |
| Common synonyms | Thymalfasin; Tα1 | Thymalfasin is the international nonproprietary name |
Most published studies on thymosin alpha-1 report changes in immune measurements rather than clinical outcomes, and findings differ across designs and populations. Whether the peptide signals through one defined receptor or through several less specific interactions remains an open question. Its reported circulation half-life of a few hours complicates comparison of dosing schedules across trials. Mechanistic claims are frequently drawn from isolated cell cultures, and how far those results extend to whole organisms is unresolved.
Thymosin alpha-1 is a synthetic peptide of 28 amino acids whose sequence matches the amino-terminal region of prothymosin alpha. The chain is acetylated at its first residue and contains one disulfide bridge between two cysteine residues, which folds the molecule into a compact loop. Its molecular formula, C129H215N33O55, corresponds to a monoisotopic mass of roughly 3,106 daltons. Material used in laboratories is made by solid-phase synthesis rather than isolated from animal tissue.
Early work on thymic extracts in the 1960s described a heat-stable acidic fraction containing many polypeptides. Separation of that mixture yielded individual components, and thymosin alpha-1 was named as one of them on the basis of assays for T-cell activity. The first preparations came from calf thymus, while subsequent research and clinical material has been chemically synthesized. Nomenclature in older papers is inconsistent, and the same peptide sometimes appears under different designations, which complicates literature searches.
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。
The α-decay half-life of 240Cm was determined as 26.8 days and later revised to 30.4 days. The discovery of curium and americium in 1944 was closely related to the Manhattan Project, so the results were confidential and declassified only in 1945. Seaborg leaked the synthesis of the elements 95 and 96 on the U.S. radio show for children, the Quiz Kids, five days before the official presentation at an American Chemical Society meeting on November 11, 1945, when one listener asked if any new transuranic element beside plutonium and neptunium had been discovered during the war. The discovery of curium (242Cm and 240Cm), its production, and its compounds was later patented listing only Seaborg as the inventor.
==== Adverse effects on public health ==== Public health and policy researchers at Yale University and the University of Pennsylvania sent a letter to Senate leaders warning that cuts to health programs in the bill would lead to over 51,000 preventable deaths annually.
The Israeli Defense Force (IDF) actively recruits influencers on TikTok and other social media platforms, often with what commentators have dubbed "Thirst traps". In a separate case in 2021, the IDF awarded a TikToker who was one of its military police officers for promoting the image of Israel. She had more followers than IDF spokesperson Ran Kochav or Prime Minister Benjamin Netanyahu. Since 2021, TikTok has created "election centres" on its platform leading up to European Parliament elections. About 30% of EP lawmakers use TikTok to get their messages across and to dispel misinformation. In February 2024, the re-election campaign for then-US president Joe Biden announced that it had opened a TikTok account while taking "advanced safety precautions". Biden posted his first video during Super Bowl LVIII. The move was criticized by a number of lawmakers over security concerns. Since 2022, the Biden administration had briefed TikTokers on news items such as the Russo-Ukrainian war and student debt relief in the United States.
=== Category:EC 1.13 (act on single donors with incorporation of molecular oxygen) === Category:EC 1.13.11 (With incorporation of two atoms of oxygen) 4-hydroxyphenylpyruvate dioxygenase (EC 1.13.11.27) Category:EC 1.13.12 (With incorporation of one atom of oxygen (internal monooxygenases or internal mixed function oxidases)) Renilla-luciferin 2-monooxygenase EC 1.13.12.5 Cypridina-luciferin 2-monooxygenase EC 1.13.12.6 Firefly luciferase EC 1.13.12.7 Watasenia-luciferin 2-monooxygenase EC 1.13.12.8 Oplophorus-luciferin 2-monooxygenase EC 1.13.12.13
Sources: en.wikipedia.org
== Liquid chromatography == Back pressure is the term used for the hydraulic pressure required to create a flow through a chromatography column in high-performance liquid chromatography, the term deriving from the fact that it is generated by the resistance of the column, and exerts its influence backwards on the pump that must supply the flow. Back-pressure is a useful diagnostic feature of problems with the chromatography column. Rapid chromatography is favoured by columns packed with very small particles, which create high back-pressures. Column designers use "kinetic plots" to show the performance of a column at a constant back-pressure, usually selected as the maximum that a system's pump can reliably produce.
Topical gels are a topical drug delivery dosage form commonly used in cosmetics and treatments for skin diseases because of their advantages over cream and ointment. They are formed from a mixture of gelator, solvent, active drug, and other excipients, and can be classified into organogels and hydrogels. Drug formulation and preparation methods depend on the properties of the gelators, solvents, drug and excipients used.
==== Films in which Jung is a character in the narrative ==== 2002 saw the release of an Italian film about Jung and Spielrein, The Soul Keeper (Prendimi l'Anima) directed by Roberto Faenza. It used English dialogue and English actors, but was never formally released in the United States. Emilia Fox played Sabina Spielrein and Iain Glen was Carl Gustav Jung. A Dangerous Method, a 2011 film directed by David Cronenberg, is a fictional dramatisation of the lives of Freud, Jung, and Sabina Spielrein between 1904 and 1913. Spielrein is the Russian woman who became Jung's lover and student and, later, an analyst herself. Michael Fassbender plays Carl Jung. The film is based on the stage play The Talking Cure by Christopher Hampton, which was in turn based on the 1993 non-fiction book by John Kerr, A Most Dangerous Method: The Story of Jung, Freud, and Sabina Spielrein. In the online animated series, Super Science Friends, Jung, voiced by Tom Park, is featured as one of the recurrent antagonists against Sigmund Freud. Soul, a 2020 Pixar film written by Pete Docter, Mike Jones and Kemp Powers, includes brief appearances of Jung as an ethereal cartoon character, "Soul Carl Jung". Jeff Lillico portrays Jung in episode 13 of season 15 "Murdoch on the Couch" (10 January 2022) of the Canadian television period detective series Murdoch Mysteries.
=== Metal chelation and antioxidant systems === Trace transition metals, particularly iron and copper, can accelerate oxidative reactions in foods and other sensitive products. Metal-chelating packaging contains compounds that bind these metals and reduce their ability to promote oxidation. Chelating compounds may be immobilised on a polymer surface so that they interact with the product without being directly mixed into it. This approach has been studied as a method for improving oxidative stability and reducing dependence on directly added preservatives. Antioxidants can also be incorporated into films, coatings, labels, or sachets. The active compound may remain immobilised on the package surface or be designed to migrate within regulated limits.
=== Spintronic properties === Graphene exhibits spintronic and magnetic properties concurrently. Low-defect graphene Nano-meshes, fabricated using a non-lithographic approach, exhibit significant ferromagnetism even at room temperature. Additionally, a spin pumping effect has been observed with fields applied in parallel to the planes of few-layer ferromagnetic nano-meshes, while a magnetoresistance hysteresis loop is evident under perpendicular fields. Charge-neutral graphene has demonstrated magnetoresistance exceeding 100% in magnetic fields generated by standard permanent magnets (approximately 0.1 tesla), marking a record magneto resistivity at room temperature among known materials.
Sources: en.wikipedia.org
Thyroglobulin (Tg) is a 660 kDa, dimeric glycoprotein produced by the follicular cells of the thyroid and used entirely within the thyroid gland. Tg is secreted and accumulated at hundreds of grams per litre in the extracellular compartment of the thyroid follicles, accounting for approximately half of the protein content of the thyroid gland. Human TG (hTG) is a homodimer of subunits each containing 2768 amino acids as synthesized (a short signal peptide of 19 amino acids may be removed from the N-terminus in the mature protein). Thyroglobulin is in all vertebrates the main precursor to thyroid hormones, which are produced when thyroglobulin's tyrosine residues are combined with iodine and the protein is subsequently cleaved. Each thyroglobulin molecule contains approximately 16 tyrosine residues, but only around 10 of these are subject to iodination by thyroperoxidase in the follicular colloid. It takes two iodinated tyrosines to make a thyroid hormone molecule; therefore, each Tg molecule forms approximately 5 thyroid hormone molecules.
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=== Availability === Cyproheptadine is available widely throughout the world. This includes in Australia, Canada, Europe, Hong Kong, India, Japan, Mexico, Turkey, the United Kingdom, and the United States, among others.
12 April The Scottish Government announces it will mount a legal challenge against the UK government's decision to block the Gender Recognition Reform (Scotland) Bill. SNP leader Humza Yousaf confirms that his party will not pay any legal fees for former chief executive Peter Murrell, but that he will not be suspended from the party because he is "innocent until proven guilty". 13 April – Representatives from BBC Scotland, STV, Viaplay and the Scottish FA meet to discuss the broadcasting of men's football in Scotland, the rights of which are owned by Viaplay until 2028. The meeting, to discuss showing free-to-air matches, ends without resolution, but is described by Gavin Newlands MP as encouraging. 15 April – The SNP's National Executive Committee orders a review of the party's transparency and governance. Corach Rambler, trained in Scotland at Milnathort by Lucinda Russell, wins the 2023 Grand National. 16 April The Sunday Mail publishes leaked video purporting to show Nicola Sturgeon playing down concerns about the SNP's finances. The SNP says that its finances are "in balance" following reports the party is facing a financial crisis. 18 April – SNP treasurer Colin Beattie is arrested and questioned by Police Scotland in connection with their ongoing investigation into the party's finances. 19 April – Colin Beattie resigns as SNP treasurer with immediate effect. 22 April – Police Scotland make several arrests at Ayr Racecourse as the protest group Animal Rising attempts to disrupt the Scottish Grand National by invading the course.
Sources: en.wikipedia.org
It is a chain of 28 amino acids, with an acetyl group attached to the first serine residue. The synthetic version replicates this sequence. Its molecular mass is about 3,108 daltons.
It is usually described as an immunomodulatory peptide rather than a classic hormone. It acts on immune cells through receptor pathways. No single endocrine organ target defines its function.
Several countries, including Italy and China, allow it for specific indications. The FDA has not approved it as a drug in the United States. Availability depends on local regulation.
Reverse-phase HPLC with ultraviolet detection at 214 nm is common. Mass spectrometry is used to confirm molecular identity and detect modifications. Immunoassays exist but may not distinguish the intact peptide from fragments.