This is a working overview of thymosin alpha-1, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-05-07 and is reviewed periodically as new material appears.
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.
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.
Identity and purity are assessed with a small set of standard peptide methods. Reversed-phase high-performance liquid chromatography separates the main peak from truncated or oxidized species, and its area percentage is the usual purity measure. Mass spectrometry confirms the observed molecular mass against the expected value, while amino acid analysis or peptide mapping checks composition and sequence. Specifications for research-grade material are often stated as 95 percent or higher, though the exact limit depends on the supplier and the intended use.
Laboratory supplies of the peptide usually arrive as a lyophilized powder in sealed vials. The powder is hygroscopic, so a vial should be allowed to reach room temperature before it is opened to prevent condensation on the contents. Weighing and transfer are best performed in a low-humidity environment with clean tools. Once dissolved, the solution should be mixed gently rather than vortexed, because foaming and shear can reduce recovery of the peptide.
Storage recommendations center on low temperature, dryness, and protection from repeated freezing and thawing. The intact powder is commonly held at 20 degrees below zero Celsius or colder, while a working solution is divided into single-use aliquots to limit freeze-thaw cycles. Buffered saline or phosphate-buffered saline at neutral pH is frequently used as a diluent. Light sensitivity is not well documented, yet amber vials or foil wrapping are common practice for long-term storage of peptide stocks.
| 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 |
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.
Thymosin alpha 1 is approved as a medicine in several countries, including Italy and China, for indications such as chronic hepatitis B and as an immune adjuvant. It is not approved by the United States Food and Drug Administration as a therapeutic product. In research settings the peptide appears in studies of sepsis, vaccine response, and oncology support, often with mixed or inconclusive results. The evidence base is uneven, and reviews note that many trials were small. Regulatory status therefore differs widely between jurisdictions.
The peptide lacks cysteine, methionine, and tryptophan, so disulfide scrambling and sulfur oxidation are not major degradation routes. Instead, aspartate residues can undergo isomerization or cyclization to succinimide intermediates, generating isoaspartate variants. Hydrolysis of peptide bonds also occurs slowly in solution. These changes may reduce biological activity even when the main peak remains detectable. Stability studies therefore track both potency and the appearance of related substances.
Lyophilized thymosin alpha 1 is typically stored refrigerated at 2 to 8 degrees Celsius and kept away from light. Reconstituted solutions are less stable and are usually used promptly after preparation. Repeated freeze-thaw cycles are avoided because they can promote aggregation and loss of activity. The peptide adsorbs to some plastic and glass surfaces, so a carrier protein is often added to dilute working solutions. Manufacturer instructions and published protocols both govern handling.
Within the immune system, the peptide acts on several cell types rather than a single target. Reported activities include promotion of T-cell maturation, enhancement of natural killer cell activity, and modulation of cytokine production by dendritic cells and macrophages. Some of these effects appear to operate through toll-like receptor signaling, though the precise receptor-level mechanism remains debated. Whether the observed immune changes translate into clinical benefit is a separate question and depends on the indication studied.
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.
== Variations == Coffee beans can be "seeded" with the same microbes as in civet gut to produce the same coffee flavor without having to deal with civet excrement. The binturong is also sometimes kept captive for the production of kopi luwak. There are reports of a kopi luwak type process occurring naturally with muntjac and birds. Bat coffee is another variation that is in demand. Bats feed on the ripest coffee and fruits and spit out the seeds. These seeds are dried and processed to make coffee with a slight fruity flavor.
Three different arrangements of iron atoms in solid iron are observed at ordinary pressures. These allotropes are conventionally denoted α, γ, δ, and ε. As molten iron cools past its freezing point of 1538 °C, it crystallizes into its δ allotrope, which has a body-centered cubic (bcc) crystal structure. As it cools further to 1394 °C, it changes to its γ-iron allotrope, a face-centered cubic (fcc) crystal structure, or austenite. At 912 °C and below, the crystal structure again becomes the bcc α-iron allotrope. In the transition from body-centered to face centered, the crystal expands along one axis and contracts along the other two axis, resulting in a net reduction of volume of about 0.41 percent.
, where distance is the direct (not logarithmic) distance in number of decades or "octaves" to the right the mass concentration is found. To translate from mass to molar concentration, the dividend (molar mass and the divisor (1000) in the division change places, or, alternatively, distance to right is changed to distance to left. Substances with a molar mass around 1000g/mol (e.g. thyroxine) are almost vertically aligned in the mass and molar images. Adrenocorticotropic hormone, on the other hand, with a molar mass of 4540, is 0.7 decades to the right in the mass image. Substances with molar mass below 1000g/mol (e.g. electrolytes and metabolites) would have "negative" distance, that is, masses deviating to the left. Many substances given in mass concentration are not given in molar amount because they haven't been added to the article. The diagram above can also be used as an alternative way to convert any substance concentration (not only the normal or optimal ones) from molar to mass units and vice versa for those substances appearing in both scales, by measuring how much they are horizontally displaced from one another (representing the molar mass for that substance), and using the same distance from the concentration to be converted to determine the equivalent concentration in terms of the other unit. For example, on a certain monitor, the horizontal distance between the upper limits for parathyroid hormone in pmol/L and pg/mL may be 7 cm, with the mass concentration to the right.
== Gene == The POMC gene is located on chromosome 2p23.3. This gene encodes a 285-amino acid polypeptide hormone precursor that undergoes extensive, tissue-specific, post-translational processing via cleavage by subtilisin-like enzymes known as prohormone convertases.
Two policemen disguised as orienteers, Bertil Brosved and Ulf Högenberg, tried to arrest him at the same time as Olofsson pulled a pistol out of his waistband and fired two shots. Högenberg was hit in the shoulder. Olofsson was first sentenced to ten years in prison, but the Court of Appeal changed the sentence to eight years. Norgren was sentenced to 12 years, which was the most severe punishment a Swedish court could impose at that time. On 4 February 1969, Olofsson escaped from Kumla Prison and fled to the Canary Islands. He then entered West Germany on a fake passport, flying to Frankfurt am Main, where he lived until he was arrested by the German police. He was escorted to the ferry in Travemünde where two Swedish police officers met him. He was then taken via Malmö back to the Kumla Prison. Two months before he was to be released, he escaped again, from Lingatan Prison, an open institution in Bohuslän. On 2 February 1973, he was arrested in the dining room of the Kurhotel in Ulricehamn. Police had received a tip from a cleaning lady who had seen a gun in his hotel room. At the time of his arrest, he had been on the run for seven months and had robbed a bank in Gothenburg. In May 1973, he was sentenced to six years in prison and transported to the Kalmar Prison.
Sources: en.wikipedia.org
=== Student Union Memorial Center === The Student Union Memorial Center, on the north side of the Mall east of Old Main, was completely reconstructed between 2000 and 2003. It replaced a 270,000-square-foot (25,000 m2) building that originally opened in 1951 and had been expanded during the 1960s and early 1970s. Designed to resemble the USS Arizona (BB-39), the building includes memorial features honoring members of the university community and others who served in the military. Memorial sculptures throughout the complex incorporate elements such as the sounds of chiming dog tags and refracted light. One of the center's best known features is the USS Arizona bell, which is housed in the building's clock tower. The 1,820-pound (826 kg) bell was one of two recovered from the battleship after the attack on Pearl Harbor and arrived on campus in July 1946. For decades, the bell was rung seven times on the third Wednesday of every month at 12:07 p.m., marking the time of the USS Arizona's sinking on December 7, 1941. The bell was also rung after Arizona Wildcats football home victories, except against other Arizona schools. In December 2020, the university ended the long-standing ringing tradition after the U.S. Navy, which still owns the bell, requested that the historic object be protected from further wear.
== Further reading == Greer, William R.; Logan, John A.; Willis, Paul S. (1986). America the Bountiful: How the Supermarket Came to Main Street : an Oral History. Washington, D.C.: Food Marketing Institute in cooperation with Beatrice Companies. OCLC 14357784. Longstreth, R. W. (1999). The Drive-In, the Supermarket, and the Transformation of Commercial Space in Los Angeles, 1914-1941. The MIT Press. Lorr, B. (2020). The Secret Life of Groceries: The Dark Miracle of the American Supermarket. Avery. Newman, K. (2012). The Secret Financial Life of Food: From Commodities Markets to Supermarkets (Illustrated edition). Columbia University Press. Petroski, Henry (November–December 2005). "Shopping by Design". American Scientist 93 (6): 491. Sowell, Thomas. Basic Economics (Third Edition, 2007 Basic Books). Pages 92–94 describe the competition between the dominant grocery chains in the United States through the 20th century and beyond. Yee, A. (2003). Shopping at Giant Foods: Chinese American Supermarkets in Northern California (Illustrated edition). University of Washington Press.
February 22, 2013: Bermuda In its National Economic Report of Bermuda for 2012, the Bermudan Ministry of Finance expects GDP will decline by 0% to 1.5% in 2013 but five years of recession will end with "modest growth in 2014". GDP is thought to have contracted by 1.75% to 2.25% in 2012 after a decline of 2.8% in 2011.
=== Honey bee products === Honey bee products are used medicinally across Asia, Europe, Africa, Australia, and the Americas, despite the fact that the honey bee was not introduced to the Americas until the colonization by Spain and Portugal. They are by far the most common medical insect product, both historically and currently. Honey is the most frequently referenced medical bee material. It can be applied to skin to treat excessive scar tissue, rashes, and burns, and can be applied as a poultice to eyes to treat infection. It is also consumed for digestive problems and as a general health restorative, and can be heated and consumed to treat head colds, cough, throat infections, laryngitis, tuberculosis, and lung diseases. Additionally, apitoxin, or honey bee venom, can be applied via direct stings to relieve arthritis, rheumatism, polyneuritis, and asthma. Propolis, a resinous, waxy mixture collected by honeybees and used as a hive insulator and sealant, is often consumed by menopausal women because of its high hormone content, and it is said to have antibiotic, anesthetic, and anti-inflammatory properties. Royal jelly is used to treat anemia, gastrointestinal ulcers, arteriosclerosis, hypo- and hypertension, and inhibition of sexual libido. Finally Bee bread, or bee pollen, is eaten as a generally health restorative, and is said to help treat both internal and external infections. All of these honey bee products are regularly produced and sold, especially online and in health food stores, though none are yet approved by the FDA.
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.
Aliquots are typically frozen well below zero Celsius and thawed only once, since repeated cycles promote aggregation and loss. Dilution into a neutral buffer limits degradation during short working periods, and prolonged storage at room temperature is avoided.