Everything below concerns immunomodulatory peptide. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-07-17. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 acids, corresponding to the N-terminal fragment of prothymosin alpha. Its sequence begins with acetylation at the N-terminus, a modification that affects stability and receptor interaction. The peptide is acidic, with a calculated isoelectric point near 4.2, and carries no disulfide bonds, so its secondary structure is largely flexible in solution. Molecular mass is approximately 3108 daltons. The native form was first isolated from bovine thymus tissue, while pharmaceutical material is produced by solid-phase peptide synthesis.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic peptide, 28 residues | N-terminal fragment of prothymosin alpha |
| Molecular mass | About 3108 Da | Acetylated form |
| Isoelectric point | Near 4.2 | Acidic peptide |
| Appearance | White to off-white lyophilized powder | Common supplied form |
| Typical storage | -20 °C or below, dry | Solution stability is lower |
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.
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。
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。
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.
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.
Tho told Kissinger that the Khmer Rouge's leader, Pol Pot, was a Vietnamphobe and that North Vietnam had very limited influence over him. At the same time, Kissinger reported to Nixon that "only a miracle" could save South Vietnam now, as Thiệu showed no signs of making the necessary reforms to allow the ARVN to fight. His assessment of Cambodia was even bleaker, as the Lon Nol regime had lost control of much of the countryside by the spring of 1973, and only American air strikes prevented the Khmer Rouge from taking Phnom Penh. Between March–May 1973, American bombers dropped 95,000 tons of bombs on Cambodia, while American fighters dropped another 15,000 tons of bombs. On 4 June 1973, the Senate passed a bill that already cleared the House of Representatives to block funding for any American military operations in Indochina, and Kissinger spent much of the summer of 1973 lobbying Congress to extend the deadline to 15 August in order to keep bombing Cambodia. The Lon Nol regime was saved in 1973 due to heavy American bombing, but the cutoff in funding ended the possibility of an American return to Southeast Asia. The PAVN had taken heavy losses in the Easter Offensive, but the North Vietnamese were rebuilding their strength for a new offensive. By the spring of 1973, Nixon was caught up in the Watergate scandal and was losing interest in foreign affairs. Kissinger was angry that the Secretary of State, William Rogers, had not resigned so he take could over the State Department, shouting: "And now's he's hanging on just as I said he would. Piece by piece. Bit by bit.
=== Arjo === Arjo was founded in 1957 by Arne Johansson in the Swedish town of Eslöv. The company name consists of the first two letters of the first and last name of the company founder. Arjo initially functioned as a supplier of components and machine parts to medical device manufacturers. In 1972, the company developed the first height-adjustable bathtub and introduced it to the market. In 1993, the company's shares are listed on the Stockholm Stock Exchange and the London Stock Exchange. In 1995, the company merged with the Swedish Getinge Group, in whose "Extended Care" business area it continued to operate under its brand name. In 2004, Arjo took over the company BHM Medical and rounded off its range of passenger lifts with its Ceiling Lifts.
=== Refrigeration === Around 1938, following a request by Numero, Jones began designing the Thermo Control Model A automatic truck refrigeration unit. Jones designed the portable air-cooling unit for trucks carrying perishable food to prevent spoilage. The Model A refrigeration equipment was attached to undercarriages of trucks. Chilled air was transported to the inside of the trailer via refrigerant tubing. Because Model A was too heavy, Jones later developed the Model B, which was smaller and lighter, but not durable. In 1941, Jones completed development of the Model C, which was mounted to the front of the truck, was compact, light, and withstood road travel vibrations. In 1939, Jones filed for a patent for the Model A and received a patent for it on July 12, 1949. Numero sold his movie sound equipment business to RCA and formed a new company in partnership with Jones, the U.S. Thermo Control Company (later the Thermo King Corporation) which became a $3 million business by 1949. Portable cooling units designed by Jones were especially important during World War II, preserving blood, medicine, and food for use at army hospitals and on open battlefields. Model C units were initially manufactured for military use, but following the war the units became available for commercial use as well.
Freeman had four film releases in 1989. In the first, he starred as Sergeant Major John Rawlins in Glory, directed by Edward Zwick, about the 54th Massachusetts Infantry Regiment, the Union Army's second African-American regiment in the American Civil War. Writing for The Washington Post, Desson Thomson praised Freeman and co-star Denzel Washington for their "warming sense of fraternity". Glory was nominated for five Academy Awards and won three: Best Supporting Actor for Washington, Best Cinematography, and Best Sound. Next, Freeman starred in the comedy-drama Driving Miss Daisy, alongside Jessica Tandy and Dan Aykroyd. Based on Alfred Uhry's play of the same name in which Freeman had appeared previously, he reprises his role of Hoke Colburn, chauffeur for a Jewish widow. The film was a commercial success and grossed US$145 million worldwide. Film critics were mainly positive; Henry Sheehan from The Hollywood Reporter opined that Freeman and Tandy's performances complemented each other while retaining their "individual star-quality". The film was nominated for nine Academy Awards (and received four, Best Picture being one of them), including Best Actor for Freeman. His third release was the biographical drama Lean on Me, in which he portrays the principal of an under-performing and drug- and crime-ridden New Jersey high school. Jane Galbraith of Variety magazine thought Freeman's casting was "wonderful". Lastly in 1989, he starred in Walter Hill's Johnny Handsome, a crime drama in which he plays a New Orleans police officer.
Currently, three proteins from the pathway have been identified, of which include D-lactate dehydrogenase, phosphotransacetylase, and the acetate kinase. The acetate kinase specifically acts to catabolize D-lactate for substrate-level phosphorylation of ADP into ATP, producing acetate as a byproduct. This pathway, which takes place in the cytoplasm, can also generate ATP by assisting the maintenance of the electrochemical gradient that lies between the periplasm and cytoplasm of T.pallidum.
Sources: en.wikipedia.org
==== Product scan ==== In the product scan, the first quadrupole Q1 is set to select an ion of a known mass, which is fragmented in q2. The third quadrupole Q3 is then set to scan the entire m/z range, giving information on the sizes of the fragments made. The structure of the original ion can be deduced from the ion fragmentation information. This method is commonly performed to identify transitions used for quantification by tandem MS.
=== Humans === Cocaine and other local anesthetics are known to produce cardiotoxicity by blocking sodium channels. However, no reports have been published of these same effects of cardiotoxicity associated with dimethocaine. There has been little research about toxicity of dimethocaine in humans, and therefore the exact lethal or pharmacological doses are unknown.
It could possibly be extended to 10 days and prevent substantial cell damage by low temperature preservation methods. On the same day, a separate study reports new cryoprotectant solvents, tested with cells, that could preserve organs by the latter methods for much longer with substantially reduced damage.
This system is used in many unrelated animals: ants, bees, and wasps, termites, naked mole-rat, Damaraland mole-rat, Synalpheus regalis shrimp, certain beetles, some gall thrips and some aphids. Oxygenate blood came about in unrelated animals groups: vertebrates use iron (hemoglobin) and crustaceans and many mollusks use copper (hemocyanin). Biomineralization the secrete protective shells or carapaces made out of organically made hard materials like mineral carbonates and organic chitins came about in unrelated species all at the same time during the cambrian Explosion in: mollusks, brachiopods, arthropods, bryozoans, echinoderms, tube worms. Reef builders, a number of unrelated species of sea life build rocky like reefs: some types of bacteria make stromatolites, various sponges build skeletons of calcium carbonate, like: archaeocyath sponges, and stromatoporoid sponges, corals, some anthozoan cnidarians, bryozoans, calcareous algae and some bivalves (rudist bivalves). Magnetite for orientation, magnetically charged particles of magnetite for directional sensing have been found in unrelated species of salmon, rainbow trout, some butterflies and birds. Hydrothermal vent adaptations like the use of bacteria housed in body flesh or in special organs, to the point they no longer have mouth parts, have been found in unrelated hydrothermal vent species of mollusks and tube worms (like the giant tube worm). Lichens are partnerships of fungi and algae. Each "species" of lichen is make of different fungi and algae species, thus each has to come about independently.
Sources: en.wikipedia.org
It corresponds to a fragment of the larger protein prothymosin alpha, which is present in many tissues. The isolated 28-amino-acid peptide was originally obtained from thymus preparations, and the pharmaceutical product is synthesized rather than extracted. The term therefore describes both a natural fragment and a manufactured drug substance.
Thymosin alpha-1 is a single defined 28-residue peptide, while the broader family includes unrelated peptides such as thymosin beta-4. The shared name reflects historical isolation from thymus tissue rather than a common structure. Confusion between the two is common in older literature.
No single pathway fully accounts for its reported effects. Several studies describe interaction with innate immune receptors and downstream cytokine changes, but the complete picture is not settled. Open questions remain about which effects occur at physiological concentrations.
It corresponds to the first 28 amino acids of thymosin beta-4, a larger protein found in many tissues. The fragment is acetylated at its N-terminus and is produced synthetically for research and pharmaceutical use. Synthetic and natural forms share the same sequence.