The short version of PTMA gene fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-03-25 and is reviewed periodically as new material appears.
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.
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.
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。
| 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 |
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 was identified in 1977 as a component of thymosin fraction 5, a heterogeneous preparation used in early studies of thymic function. Investigators purified the active material and determined its amino acid sequence, which enabled chemical synthesis. Work in the following decades concentrated on T-cell maturation and immune reconstitution in animals and small human cohorts. Early preparations varied in composition, so results from that period are difficult to compare with studies using defined synthetic peptide.
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.
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.
The peptide is generated in cells by cleavage of prothymosin alpha, a larger acidic protein encoded by the PTMA gene. Prothymosin alpha is expressed in many tissues, not only in the thymus, and its functions include nuclear roles in chromatin-related processes. The 28-residue fragment corresponds to the N-terminal portion of that precursor. How the cleavage occurs and how the fragment's concentration is regulated remain open questions; circulating amounts are small and difficult to measure reliably with routine assays.
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.
He was initiated into the Tau chapter of Alpha Chi Sigma at Cornell in 1949. At Cornell he elaborated and refined his Baker Lectures into his magnum opus, Principles of Polymer Chemistry which was published in 1953 by Cornell University Press. This quickly became a standard text for all workers in the field of polymers, and is still widely used to this day. Flory introduced the concept of excluded volume, coined by Werner Kuhn in 1934, to polymers. Excluded volume refers to the idea that one part of a long chain molecule can not occupy space that is already occupied by another part of the same molecule. Excluded volume causes the ends of a polymer chain in a solution to be further apart (on average) than they would be were there no excluded volume. The recognition that excluded volume was an important factor in analyzing long-chain molecules in solutions provided an important conceptual breakthrough, and led to the explanation of several puzzling experimental results of the day. It also led to the concept of the theta point, the set of conditions at which an experiment can be conducted that causes the excluded volume effect to be neutralized. At the theta point, the chain reverts to ideal chain characteristics – the long-range interactions arising from excluded volume are eliminated, allowing the experimenter to more easily measure short-range features such as structural geometry, bond rotation potentials, and steric interactions between near-neighboring groups.
== External links == TMA-2 - Isomer Design TMA-2 - PsychonautWiki TMA-2 - Erowid TMA-2 - PiHKAL - Erowid TMA-2 - PiHKAL - Isomer Design TMA-2: An Amphetamine Compound With Unique Sedative Properties - Tripsitter
== History == RO5073012 was first described in the scientific literature by 2012. It has been relatively little-studied compared to other TAAR1 partial agonists, for instance RO5166017, RO5203648, and RO5263397.
β thalassemia major (Mediterranean anemia or Cooley anemia) is caused by a βo/βo genotype. No functional β chains are produced, and thus no hemoglobin A can be assembled. This is the most severe form of β-thalassemia. β thalassemia intermedia is caused by a β+/βo or β+/β+ genotype. In this form, some hemoglobin A is produced. β thalassemia minor is caused by a β/βo or β/β+ genotype. Only one of the two β globin alleles contains a mutation, so β chain production is not terribly compromised and patients may be relatively asymptomatic.
Sources: en.wikipedia.org
=== 1 December === The RSF captured the 22nd Infantry Division headquarters in Babanusa and claimed full control over the city. The SPLM-N (al-Hilu) claimed to have retaken the town of Qardoud Nama in South Kordofan from the SAF.
== Mechanism == Understanding of the underlying mechanisms that cause electrotaxis to occur is limited. The diversity of biological cells and environmental conditions make it likely that there are many different mechanisms that allow for cells to migrate due to electric fields. Some studies have indicated that certain organisms move passively without any specific sensing mechanisms applied to alter active motility.
Second Cup Coffee Co. is a Canadian specialty coffee retailer operating more than 345 cafes across the country. Its headquarters are in Mississauga, Ontario. Its stores sell hot and cold beverages, pastries, snacks, pre-packaged food items, hot and cold sandwiches, and drinkware, including mugs and tumblers. Second Cup sales continue to compete with Starbucks, Tim Hortons and McDonald's, which also feature espresso-based specialty drinks. Since its inception, Second Cup has expanded its franchises to the United States, Morocco, Saudi Arabia, Bahrain, Kuwait, Oman, Qatar, Lebanon, Jordan, Egypt, the United Arab Emirates, Iraq, Syria, Yemen, Cyprus, Azerbaijan, Angola, Lithuania, and Romania. It also opened a store in Pakistan in 2013, in the United Kingdom in 2014, in the Philippines in 2015, and in Poland in 2016.
Belize became the first country in the world to completely ban bottom trawling in December 2010. In December 2015, Belize banned offshore oil drilling within 1 km (0.6 mi) of the Barrier Reef and all of its seven World Heritage Sites. In 2017, the Government and people of Belize made marine conservation history implementing an indefinite moratorium on offshore oil activities everywhere Belize exercises maritime jurisdiction. This move was further bolstered when the Government enacted law which requires a referendum if there is any move to lift the moratorium. Despite these protective measures, the reef remains under threat from oceanic pollution as well as uncontrolled tourism, shipping, and fishing. Other threats include hurricanes, climate change and the resulting increase in ocean temperatures, which causes coral bleaching. It is claimed by scientists that over 40% of Belize's coral reef has been damaged since 1998.
The direct quaternization of chitosan amino acids treats chitosan with haloalkanes under alkaline conditions. Another method is the reaction of chitosan with aldehydes first, followed by reduction, and finally with haloalkanes to obtain quaternized chitosan. The indirect quaternization method refers to introducing small molecules containing quaternary ammonium groups into chitosan, such as glycidyl trimethyl ammonium chloride, (5-bromopentyl) trimethyl ammonium bromide, etc. Quaternary ammonium groups can further be introduced into the chitosan backbone via azide-alkyne cycloaddition, or by dissolving chitosan in alkali and urea and then reacting it with 3-chloro-2-hydroxypropyl trimethylammonium chloride, which provides a simple and green solution to achieve chitosan functionalization. Cationic derivatives of chitosan have important roles in bioadhesion, absorption enhancement, anti-inflammatory, antibacterial and anti-tumor applications. Chitosan modified with quaternary ammonium groups is one of the most common cationic chitosan derivatives. Quaternized chitosan with a permanent positive charge has increased antimicrobial activity and solubility compared to normal chitosan.
Sources: en.wikipedia.org
=== Kynurenine/tryptophan ratio === Changes in the ratio of kynurenine versus tryptophan are reported for many diseases like arthritis, HIV/AIDS, neuropsychiatric disorders, cancer and inflammations. The kynurenin/tryptophan is also an indicator for the activity of indoleamine 2,3-dioxygenase (IDO).
=== Enzymes === Peripheral enzymes participate in metabolism of different membrane components, such as lipids (phospholipases and cholesterol oxidases), cell wall oligosaccharides (glycosyltransferase and transglycosidases), or proteins (signal peptidase and palmitoyl protein thioesterases). Lipases can also digest lipids that form micelles or nonpolar droplets in water.
Silica nanoparticles- Silica nanoparticles can be classified into solid, non-porous, and mesoporous. They have large surface are, hydrophilic surface, and chemical and physical stabilities. Silica nanoparticles are made by the use of the Stöber process. Which is the hydrolysis of silyl ethers such as tetraethyl silicate into silanols (Si-OH) using ammonia in a mixture of water and alcohol followed by the condensation of silanols into 50–2000 nm silica particles. The size of the particle can be controlled by varying the concentration of silyl ether and alcohol or the micro emulsion method. Mesoporous silica nanoparticles are synthesized by the sol-gel process. They have pores that range in diameter from 2 nm to 50 nm. They are synthesized in a water-based solution in the presence of a base catalyst and a pore forming agent known as a surfactant. Surfactants are molecules that present the particularity to have a hydrophobic tail (alkyl chain) and a hydrophilic head (charged group, such as a quaternary amine for example). As these surfactants are added to a water-based solution, they will coordinate to form micelles with increasing concentration in order to stabilize the hydrophobic tails. Varying the pH of the solution and composition of the solvents, and the addition of certain swelling agents can control the pore size. Their hydrophilic surface is what makes silica nanoparticles so important and allows them to carry out functions such as drug and gene delivery, bio imaging and therapy.
The FR Yugoslavia was suspended from a number of international institutions. This was due to the ongoing Yugoslav Wars during the 1990s, which had prevented agreement being reached on the disposition of federal assets and liabilities, particularly the national debt. The Government of Yugoslavia supported Croatian and Bosnian Serbs in the wars from 1992 to 1995. Because of that, the country was under economic and political sanctions. War and sanctions resulted in economic disaster, which forced thousands of its young citizens to emigrate from the country. The FR Yugoslavia acted to support Serb separatist movements in breakaway states, including the Republic of Serbian Krajina and the Republika Srpska, and sought to establish them as independent Serbian republics, with potential eventual reintegration with FR Yugoslavia. The Government of FR Yugoslavia treated these republics as separate entities, and gave unofficial, rather than active, aid by transferring control of units from the now-defunct JNA to the secessionist movements. In this way, FR Yugoslavia avoided potential accusations of committing acts of aggression against the breakaway republics recognised by the international community. Following the transfer of Yugoslav Army units, Yugoslavia ceased to play an important military role in the Yugoslav Wars, barring conflicts on the border with Croatia, such as the Siege of Dubrovnik.
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。