Everything below concerns prothymosin alpha. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-03-13. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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。
胸腺素α1（thymosin alpha 1，Tα1）是一种由28个氨基酸组成的酸性肽，N端被乙酰化，分子量约为3108道尔顿。该肽最早从牛胸腺组织提取物中分离，属于胸腺素组分5的一个成分。其序列在不同哺乳动物中高度保守，提示其具有基本的生物学功能。名称中的“α1”指其在电泳中的迁移位置，并非表示亚型编号。它既存在于胸腺，也存在于脾脏和淋巴结等免疫组织。
| Property | Value | Notes |
|---|---|---|
| Amino acid length | 28 residues | Single chain with an acetylated N-terminus |
| Molecular mass | Approximately 3,108 Da | Small shifts occur with counter-ion and water content |
| Isoelectric point | Around 3.5 | Low value follows from the many acidic residues |
| Parent molecule | N-terminal region of prothymosin alpha | Free circulating form in humans is not firmly established |
| Common synonyms | Thymalfasin; T alpha 1 | Older literature also uses the full spelled-out form |
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Findings across trials are mixed; some report changes in selected immune markers, while others find no clear clinical benefit. Many studies are small and define outcomes differently, which limits comparison. Regulatory approval is confined to a few countries, and the compound is not an approved drug in the United States or most of Europe.
Overall evidence quality varies considerably. A large share of published reports come from single centers, rely on surrogate immunological markers, or lack adequate control groups. Systematic reviews have highlighted this heterogeneity as a barrier to pooling results. Open questions include which patients, if any, might benefit, what treatment duration is appropriate, and whether any effect is independent of standard care. The peptide is often described as an immune modulator rather than a therapy for one disease, which complicates confirmatory trial design.
Thymosin alpha 1 is a short peptide first isolated from bovine thymus tissue in the early 1970s during fractionation work aimed at identifying factors that influence T cell development. It belongs to a family of acidic thymic peptides, and the original preparations contained several components that were later separated by chromatography. The compound is now produced synthetically rather than extracted from tissue, which removes batch variability tied to animal sourcing. Researchers describe it as an immunomodulatory peptide because laboratory studies show effects on several cell types of the innate and adaptive immune systems.
The molecule consists of 28 amino acid residues with an acetyl group attached to the N-terminal serine. Its sequence is acidic overall, with several glutamic and aspartic acid residues distributed along the chain and no cysteine, so disulfide bridges do not form. The peptide carries a net negative charge at physiological pH. Because the N-terminus is blocked, the intact molecule resists degradation by many aminopeptidases, which contributes to its stability in biological fluids.
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.
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.
== External links == The MEROPS online database for peptidases and their inhibitors: Serine Peptidase Archived 2017-04-04 at the Wayback Machine Serine Proteases site at Saint Louis University (SLU) Serine+proteases at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
=== "Last dictators" advertisement === In 2011, Nando's launched a "Last dictators" advert in South Africa. The 60-second commercial shows a sad Robert Mugabe dining alone at Christmas in a large mansion while he reminisces about "happier times" with former dictators, such as playing water tag with Muammar Gaddafi, singing karaoke with Mao Zedong, making snow angels in the sand with Saddam Hussein, pushing P. W. Botha on a swing set, and riding a Covenanter cruiser tank with Idi Amin in a similar fashion to Leonardo DiCaprio and Kate Winslet embracing each other from the film Titanic, while the music from "Those Were the Days" is played. Musekiwa Kumbula, holder of the Nando's franchise in Zimbabwe, said his group "strongly feels the advertisement is insensitive and in poor taste." The advert also offended Chipangano, a Zimbabwean youth militia loyal to Mugabe, who then demanded an apology from Nando's, threatened to boycott the South Africa-based chain, and demanded the advert be withdrawn or the restaurant face retribution. Nando's South Africa subsequently withdrew the advert citing threats to its staff in Zimbabwe from a youth group.
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===== MeSH D08.811.913.477 – nitrogenous group transferases (EC 2.6) ===== MeSH D08.811.913.477.700 – transaminases MeSH D08.811.913.477.700.100 – alanine transaminase MeSH D08.811.913.477.700.120 – 2-aminoadipate transaminase MeSH D08.811.913.477.700.200 – 4-aminobutyrate transaminase MeSH D08.811.913.477.700.225 – aspartate aminotransferases MeSH D08.811.913.477.700.225.249 – aspartate aminotransferase, cytoplasmic MeSH D08.811.913.477.700.225.500 – aspartate aminotransferase, mitochondrial MeSH D08.811.913.477.700.286 – beta-alanine-pyruvate transaminase MeSH D08.811.913.477.700.347 – d-alanine transaminase MeSH D08.811.913.477.700.470 – Glutamate synthase (ferredoxin) MeSH D08.811.913.477.700.500 – glutamine-fructose-6-phosphate transaminase (isomerizing) MeSH D08.811.913.477.700.525 – glycine transaminase MeSH D08.811.913.477.700.535 – leucine transaminase MeSH D08.811.913.477.700.550 – l-lysine 6-transaminase MeSH D08.811.913.477.700.700 – ornithine-oxo-acid transaminase MeSH D08.811.913.477.700.800 – succinyldiaminopimelate transaminase MeSH D08.811.913.477.700.850 – tryptophan transaminase MeSH D08.811.913.477.700.900 – tyrosine transaminase
== Indian Biological Data Centre == Department of Biotechnology announces the launch of first Indian Biological Data Centre (IBDC) at Regional Centre for Biotechnology, Faridabad. A national facility to store, manage, archive and distribute all kind of biological data.
Sources: en.wikipedia.org
One-color light is well suited for traffic lights and signals, exit signs, emergency vehicle lighting, ships' navigation lights, and LED-based Christmas lights. Because of their long life, fast switching times, and visibility in broad daylight due to their high output and focus, LEDs have been used in automotive brake lights and turn signals. The use in brakes improves safety, due to a great reduction in the time needed to light fully, or faster rise time, about 200 milliseconds faster than an incandescent bulb. This gives drivers behind more time to react. In a dual intensity circuit (rear markers and brakes) if the LEDs are not pulsed at a fast enough frequency, they can create a phantom array, where ghost images of the LED appear if the eyes quickly scan across the array. White LED headlamps are beginning to appear. Using LEDs has styling advantages because LEDs can form much thinner lights than incandescent lamps with parabolic reflectors. Due to the relative cheapness of low output LEDs, they are also used in many temporary uses such as glowsticks and throwies. Artists have also used LEDs for LED art.
For services to Business and to the UK Film Industry. Catherine Anne Goodman, LVO. Artist and Educator. For services to Art. Professor Roger James Goodman. Nissan Professor of Modern Japanese Studies and Warden, St. Antony's College, University of Oxford. For services to Social Science. Gayle Jean Margaret Gorman. Lately HM Chief Inspector and Chief Executive, Education Scotland. For services to Education and Charity. Gerard Arthur Georges Grech. Founder, Tech Nation and Managing Director, Founders at the University of Cambridge. For services to the Technology Sector. The Reverend Nicholas Glyn Paul Gumbel. Lately Vicar, Holy Trinity Brompton, London. For services to the Church of England. Paul Harris. Deputy Chief Executive Officer and Operations Director, HM Courts and Tribunals Service. For Public and Voluntary Service. Martin James Hewitt, QPM. Lately Chair, National Police Chiefs Council. For services to Policing. Professor Peter Michael Hollingsworth. Director of Science and Deputy Keeper, Royal Botanic Garden, Edinburgh. For services to Botanical Science. Karl James Hoods. Chief Digital and Information Officer, Department for Science, Innovation and Technology and Department for Energy Security and Net Zero. For services to Technology and to Education. Professor Andrew Lee Hopkins, FRS, FMedSci, FRSE. Chief Executive Officer, Exscientia. For services to Science and to Innovation. Christian Edward Johnston Horner, OBE. Team Principal and Chief Executive Officer, Red Bull Racing. For services to Motor Sport. Pauline Jean Howie, OBE.
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For comparison with lower dosages, the suppression of circulating testosterone levels in men with a dosage of 100 mg/day oral CPA was 77% and with a dosage of 300 mg/week intramuscular CPA was 76%. Dosages of CPA of 12.5 to 25 mg/day have been used as a maintenance dosage for testosterone suppression in men with sexual deviance after initial administration of higher CPA dosages, without recurrence of symptoms. CPA is generally able to maximally suppress circulating testosterone levels by 70 to 80% in men. However, in spite of strong suppression of testosterone levels, CPA, at least by itself (e.g., without estrogen), is not usually able to reduce testosterone levels into the castrate/female range (<50 ng/dL) at any dosage, and testosterone levels generally remain just above it at levels of roughly 50 to 200 ng/dL. However, studies have reported that a very high dosage of CPA of 300 mg/day may suppress testosterone levels to around 50 ng/dL in men. CPA also suppresses estradiol levels in men, with one study finding about a 65% decrease in estradiol levels (from about 27 pg/mL to around 10 pg/mL) with 100 mg/day CPA. CPA has been found to maximally suppress testosterone and estradiol levels in young men within 7 days of continuous administration. Following discontinuation of CPA, the recovery of testosterone levels is variable and may require 14 days to 6 months for completion. An escape or recovery phenomenon, in which testosterone levels increase over time, has been observed with long-term CPA monotherapy.
Sources: en.wikipedia.org
One mixed-mode column can replace two or even more single mode columns, which is economic and eco-friendly for employing the stationary phase more sufficiently and reducing the consuming and ‘waste’ of raw materials. Single mixed-mode column can be applied for on-line two-dimensional (2D) analysis in a sealed system via establishing corresponding chromatographic system or off-line 2D analysis as two columns.
Glycosidic bonds of the form discussed above are known as O-glycosidic bonds, in reference to the glycosidic oxygen that links the glycoside to the aglycone or reducing end sugar. In analogy, one also considers S-glycosidic bonds (which form thioglycosides), where the oxygen of the glycosidic bond is replaced with a sulfur atom. In the same way, N-glycosidic bonds, have the glycosidic bond oxygen replaced with nitrogen. Substances containing N-glycosidic bonds are also known as glycosylamines. C-glycosyl bonds have the glycosidic oxygen replaced by a carbon; the term "C-glycoside" is considered a misnomer by IUPAC and is discouraged. All of these modified glycosidic bonds have different susceptibility to hydrolysis, and in the case of C-glycosyl structures, they are typically more resistant to hydrolysis.
== Precursors == The earliest use of chromatography is sometimes attributed to German chemist Friedlieb Ferdinand Runge, who in 1855 described the use of paper to analyze dyes. Runge dropped spots of different inorganic chemicals onto circles of filter paper already impregnated with another chemical, and reactions between the different chemicals created unique color patterns. According to historical analysis of L. S. Ettre, however, Runge's work had "nothing to do with chromatography" (and instead should be considered a precursor of chemical spot tests such as the Schiff test). In the 1860s, Christian Friedrich Schönbein and his student Friedrich Goppelsroeder published the first attempts to study the different rates at which different substances move through filter paper. Schönbein, who thought capillary action (rather than adsorption) was responsible for the movement, called the technique capillary analysis, and Goppelsroeder spent much of his career using capillary analysis to test the movement rates of a wide variety of substances. Unlike modern paper chromatography, capillary analysis used reservoirs of the substance being analyzed, creating overlapping zones of the solution components rather than separate points or bands. Work on capillary analysis continued, but without much technical development, well into the 20th century. The first significant advances over Goppelsroeder's methods came with the work of Raphael E.
Sources: en.wikipedia.org
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.
Prothymosin alpha is a much larger acidic protein, roughly 111 to 113 residues long, and the thymosin alpha-1 sequence matches its N-terminal region. The small peptide is therefore best understood as a fragment of that parent protein rather than a separate gene product.
Trials and clinical reports have examined chronic hepatitis B and C, use as a vaccine adjuvant, and supportive treatment in some immunodeficiency and oncology settings. Results vary by indication, and regulatory approval differs between countries.
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。