Everything below concerns PTMA gene. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-08. 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.
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.
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.
| 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 |
Stability depends on temperature, pH, and the number of freeze-thaw events the sample has experienced. Freeze-dried material is commonly held at -20 °C or colder, while reconstituted liquid is kept cold and used within a short window. Extreme pH and prolonged light exposure can promote deamidation, oxidation, or aggregation, particularly at asparagine and methionine positions. Adsorption to container walls can lower the measured concentration of a dilute solution even when the peptide molecules themselves remain intact.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, which separates the target peptide from truncated or chemically modified byproducts. Mass spectrometry confirms the expected molecular mass and can indicate acetylation state or sequence errors. Amino acid analysis and peptide mapping supply complementary sequence-level information, while endotoxin testing is relevant for preparations intended for cell or animal work. Purity figures reported by suppliers refer to the method used and are not directly comparable across laboratories unless conditions are stated.
Lyophilized material is typically treated as a hygroscopic solid that should be brought to room temperature before the container is opened, which limits condensation on the powder. Reconstitution is commonly done with sterile water or a buffered diluent, and gentle mixing is preferred over vigorous agitation to reduce foaming and surface adsorption. Because peptides can bind to plastic and glass, diluents containing a small amount of carrier protein are sometimes used in laboratory work. Working solutions are generally aliquoted and prepared fresh rather than subjected to repeated freezing and thawing.
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.
Thymosin alpha-1 is a 28-residue peptide first isolated from thymus tissue in the 1970s. It corresponds to the N-terminal portion of thymosin beta-4, from which it is cleaved in vivo. The peptide carries an acetyl group at its N-terminus, a modification that affects its charge and stability. Synthetic material produced by solid-phase peptide synthesis is chemically identical to the natural fragment and is the form used in research and clinical studies.
Laboratory work indicates that the peptide acts on cells of both the innate and adaptive immune systems. Reported effects include signalling through Toll-like receptors on dendritic cells, enhanced T-cell maturation, and increased natural killer cell activity. These actions are described largely from cell-culture and animal experiments, and the precise receptor-level events remain incompletely defined. Studies in humans have generally measured immune markers rather than a single defined molecular target. The resulting picture remains partly descriptive.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
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。
The dependence of osteosarcoma cells on NMNAT1-derived NAD for the PARP1-dependent DNA repair and survival is not restricted to cisplatin-treated cancer cells but has also been reported to occur in actinomycine D-treated tumor cell lines, as well. These data suggest that nuclear NAD synthesis by NMNAT1 may represent a therapeutic target in osteosarcoma and possibly in other tumors, as well.
== Mechanism == Ammonium sulfate, as well as other neutral salts, will stabilize proteins by preferential solvation. Proteins are usually stored in ammonium sulfate because it inhibits bacterial growth. With the addition of ammonium sulfate, proteins unfolded by denaturants can be pushed into their native conformations. This can be seen with the folding of recombinant proteins. The solubility of proteins varies according to the ionic strength of the solution, thus according to the salt concentration. At low ion concentrations (less than 0.5 mol/L), the solubility of proteins increases with increasing salt concentration, an effect termed "salting in". As the salt concentration is further increased, the solubility of the protein begins to decrease. At a sufficiently high ionic strength, the protein will precipitate out of the solution, an effect termed "salting out". When the ammonium (NH+4) and sulfate (SO2−4) ions are within the aqueous solution they are attracted to the opposite charges evident on the compound that is being purified. This attraction of opposite charges prevents the water molecules from interacting with the compound being purified, leading to the precipitation or "salting out". Proteins differ markedly in their solubilities at high ionic strength, therefore, "salting out" is a very useful procedure to assist in the purification of the desired protein. Ammonium sulfate is commonly used for precipitation because of its high solubility, additionally, it forms two ions high in the Hofmeister series.
== Early life and education == Csaba Horváth was born in Szolnok, Hungary and graduated in chemical engineering from the Budapest Institute of Technology. In 1956 he went to West Germany to work for Hoechst AG. He then studied physical chemistry at the J.W. Goethe University in Frankfurt, receiving his Ph.D. in 1963.
C5 convertase is an enzyme belonging to a family of serine proteases that play key role in the innate immunity. It participates in the complement system ending with cell death. There are four different C5 convertases able to specifically convert the protein C5 to C5a and C5b fragments. Two of the convertases are physiological complement enzymes, associate to the cell-surface and mediate the classical pathway (C4b2b3b, or C4b2a3b depending on source) or the alternative pathway (C3bBbC3b) of complement system. Two fluid phase C5 convertases have been described: the classical pathway enzyme, C4b2boxy3b and the cobra venom factor-dependent C5 convertase, CVFBb.
== Data analysis == Gel permeation chromatography (GPC) has become the most widely used technique for analyzing polymer samples in order to determine their molecular weights and weight distributions. Examples of GPC chromatograms of polystyrene samples with their molecular weights and dispersities are shown on the left.
Sources: en.wikipedia.org
== External links == True Anatomy for New Ways of Teaching von Hagens Plastination offers one-of-a-kind, real human teaching specimens! Plastination technique, on Body Worlds page Plastination website by Dr. Selcuk Tunali Laboratory of Plastination & Anatomical Techniques, Universidad de La Frontera, Temuco, Chile (Dr. Nicolas E. Ottone) Plastination Models Inc. Plastination in India by Dr. N. M. Shama Sundar. Plastination: Silicone Impregnation of Specimens (the standard S10 technique) Plastination: The Sheet Plastination Technique International Society for Plastination The New Plastination Index Online The New Plastination Index on-line: Subject Index "Exhibit Human" a documentary on plastination by Aaron Edell Learn About PCOM's Plastination Process Plastination
As governor, Newsom has focused on infrastructure, housing, climate, gun control and LGBTQ rights. In 2025, he began hosting the podcast This Is Gavin Newsom, which has featured guests from across the political spectrum. He oversaw the passage of California Proposition 50, a gerrymandering proposal developed in response to 2025 Texas redistricting. Newsom is a potential 2028 presidential candidate.
Ollie captures her and withholds her Joy, forcing her to remember that she had helped the Germans during the Very Bad Thing. Both aware of the city's true history, Ollie informs her that the city's food has run out and implores her to help him reveal these truths to save the people. Victoria agrees, but when Ollie releases her, she attacks him and escapes. After finding the town's executive committee too addled on Joy to pay any mind to the tanks or the famine, Ollie decides to confront Uncle Jack (Julian Casey), Wellington Wells' friendly celebrity propagandist. Ollie infiltrates his broadcasting studio above City Hall, but he finds the studio is abandoned and Jack is missing. He plays a tape of his final but unreleased broadcast, in which Jack suffers an emotional breakdown brought about by resurfacing memories of his daughter Margaret and despairs over the town's hopeless situation. Ollie finally realizes that Margaret was actually Jack's daughter; Jack had tried to hide her from the Germans, but Ollie (who was their neighbor and hated Jack for being a collaborator) informed on them, and she was shot trying to flee. Now willing to atone, Ollie broadcasts the unreleased tape to the city, awakening the population. He then bids farewell to Margaret and builds a hot air balloon that he rides out of Wellington Wells.
=== Traditional Chinese medicine === In addition to its culinary use, red yeast rice is also used in Chinese herbology and traditional Chinese medicine. Medicinal use of red yeast rice is described in the Chinese pharmacopoeia Ben Cao Gang Mu compiled by Li Shizhen ca. 1590. Recommendations were to take it internally to invigorate the body, aid in digestion, and revitalize the blood. One reference provided the Li Shizhen health claims as a quotation "...the effect of promoting the circulation of blood and releasing stasis, invigorating the spleen, and eliminating [in]digestion."
Sources: en.wikipedia.org
Neely's articles have been compiled into several books, including, The Secret History of Knoxville (1995), From the Shadow Side (2003), and Knoxville: This Obscure Prismatic City (2009). Arcadia has published several short books on local topics as part of its "Images of America" series, including Ed Hooper's WIVK (2008) and WNOX (2009), and 1982 World's Fair (2009) by Martha Rose Woodward. Other books on Knoxville topics include Wendy Lowe Besmann's Separate Circle: Jewish Life in Knoxville, Tennessee, which details the development of the city's Jewish community, and Sylvia Lynch's Harvey Logan in Knoxville (1998), which covers Kid Curry's time in the city. Knoxville native and college professor Dr. Marcy Conway has also written about Knoxville's history in the book The Sunsphere City (2022) coining this nickname for Knoxville as well as mentioning current arts and culture experiences in the area. The Junior League of Knoxville's Knoxville: 50 Landmarks (1976), provides descriptions of various historical buildings in the city. A more detailed overview of the city's architectural development is provided in "Historic and Architectural Resources of Knox County" (1994), a pamphlet written by Metropolitan Planning Commission preservationist Ann Bennett for the National Register of Historic Places. The National Register includes over 100 buildings and districts in Knoxville and Knox County, with extensive descriptions of the buildings provided in their respective nomination forms, which are being digitized for the Register's online database.
The hair shaft is majorly composed of hair keratins and their associated proteins (KRTAPs). KRTAPs are products of diverse gene families resulting from gene duplication events in their evolutionary history. These genes are typically small, comprising a single exon less than 1,000 base pairs long. Over the last decade, numerous KRTAP genes have been identified across mammals, including humans. They are categorized into three groups based on their amino acid composition: high sulfur (with <30 mol% cysteine), ultrahigh sulfur (>30 mol% cysteine), and high glycine/tyrosine. Hair keratins form intermediate filaments (KIFs) within trichocytes, specialized cells that contribute to hair formation. As these cells move upward in the cortex, KIFs aggregate, surrounded by a space called the matrix. KRTAPs, also known as KAPs, are a significant part of this matrix between KIFs. It's suggested that KRTAPs play a role in establishing a cross-linked network with KIFs, contributing to the creation of the rigid hair shaft.
The microstructure of a polymer (sometimes called configuration) relates to the physical arrangement of monomer residues along the backbone of the chain. These are the elements of polymer structure that require the breaking of a covalent bond in order to change. Various polymer structures can be produced depending on the monomers and reaction conditions: A polymer may consist of linear macromolecules containing each only one unbranched chain. In the case of unbranched polyethylene, this chain is a long-chain n-alkane. There are also branched macromolecules with a main chain and side chains, in the case of polyethylene the side chains would be alkyl groups. In particular unbranched macromolecules can be in the solid state semi-crystalline, crystalline chain sections highlighted red in the figure below. While branched and unbranched polymers are usually thermoplastics, many elastomers have a wide-meshed cross-linking between the "main chains". Close-meshed crosslinking, on the other hand, leads to thermosets. Cross-links and branches are shown as red dots in the figures. Highly branched polymers are amorphous and the molecules in the solid interact randomly.
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.
Thymosin fraction 5 is a mixture of many peptides obtained from thymus tissue, while thymosin alpha 1 is a single defined 28-residue molecule. The two names appear together in older literature because the purified peptide was first obtained from that mixture.