If you have been reading about Thymosin alpha 1 and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-08-11. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular mass | ≈3,108 Da | Synthetic 28-residue peptide |
| Amino acid count | 28 | N-terminal serine carries an acetyl group |
| Appearance | White to off-white powder | Lyophilized solid |
| Water solubility | Freely soluble | Dissolves in aqueous buffer |
| Common synonyms | Thymalfasin; Tα1 | Thymalfasin is the international nonproprietary name |
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 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.
== Awards and recognition == Reith and her two collaborators were recognised on 28 March 1984 in an early day motion in the House of Commons, tabled by Michael Forsyth and other MPs. She was made a Commander of the Order of the British Empire (CBE) in the 2023 Birthday Honours, "for services to people with diabetes". She was given a Lifetime Achievement award at the 2024 Pride Of Britain Awards.
== Distribution and habitat == The death cap is native to Europe, where it is widespread. It is found from the southern coastal regions of Scandinavia in the north, to Ireland in the west, east to Poland and western Russia, and south throughout the Balkans, in Greece, Italy, Spain, and Portugal in the Mediterranean basin, and in Morocco and Algeria in north Africa. In west Asia, it has been reported from forests of northern Iran. There are records from further east in Asia but these have yet to be confirmed as A. phalloides. By the end of the 19th century, Charles Horton Peck had reported A. phalloides in North America. In 1918, samples from the eastern United States were identified as being a distinct though similar species, A. brunnescens, by George Francis Atkinson of Cornell University. By the 1970s, it had become clear that A. phalloides does occur in the United States, apparently having been introduced from Europe alongside chestnuts, with populations on the West and East Coasts. A 2006 historical review concluded the East Coast populations were inadvertently introduced, likely on the roots of other purposely imported plants such as chestnuts. The origins of the West Coast populations remained unclear, due to scant historical records, but a 2009 genetic study provided strong evidence for the introduced status of the fungus on the west coast of North America. Observations of various collections of A. phalloides, from conifers rather than native forests, have led to the hypothesis that the species was introduced to North America multiple times.
=== Itching === In the classic scenario, the itch is made worse by warmth and is usually experienced as being worse at night, possibly because distractions are fewer. As a symptom, it is less common in the elderly.
=== Radiogenic === Some 209Bi was created radiogenically from the neptunium decay chain. Neptunium-237 is an extinct radionuclide, but it can be found in traces in uranium ores because of neutron capture reactions. This is also ultimately due to the r-process, as every (4n+1) nucleus formed (and not fissioned) ultimately decayed to bismuth.
=== Diabetes and pregnancy === A total review of metformin use during pregnancy compared to insulin alone found good short-term safety for both the mother and baby, but safety in the longer term is unclear. Several observational studies and randomized controlled trials found metformin to be as effective and safe as insulin for the management of gestational diabetes. Nonetheless, several concerns have been raised and evidence on the long-term safety of metformin for both mother and child is lacking. Compared with insulin, women with gestational diabetes treated with metformin gain less weight and are less likely to develop pre-eclampsia during pregnancy. Babies born to women treated with metformin have less visceral fat, and this may make them less prone to insulin resistance in later life. The use of metformin for gestational diabetes resulted in smaller babies compared to treatment with insulin. However, despite initially lower birth weight, children exposed to metformin during pregnancy had accelerated growth after birth, and were heavier by mid-childhood than those exposed to insulin during pregnancy. This pattern of initial low birth weight followed by catch-up growth that surpasses comparative children has been associated with long-term cardiometabolic disease. A systematic review and meta-analysis of metformin, published in 2024, found that it is safe and effective in managing gestational diabetes or diabetes in pregnancy with no adverse impact on the mother or the child after eleven years of childbirth.
Sources: en.wikipedia.org
Anshel Pfeffer(Hebrew: אנשיל פפר, born 22 June 1973); British -Israeli journalist; a senior correspondent and columnist for Haaretz, covering military, Jewish and international affairs, and Israel correspondent for The Economist.; has also written for The Guardian, The New York Times, The Washington Post and The Times; received the B'nai B'rith award for "Recognizing Excellence in Diaspora Reportage" Melanie Phillips,(born 4 June 1951) Neoconservative, and right wing hawkish pro Zionist journalist; began her career writing for The Guardian and New Statesman; during the 1990s, she came to identify with ideas more associated with the right and currently writes for The Times, The Jerusalem Post, and The Jewish Chronicle, covering political and social issues from a social conservative perspective.Irving Kristol, defines her as a liberal who has "been mugged by reality";was panellist on BBC Radio 4 programme The Moral Maze and BBC One's Question Time; was awarded the Orwell Prize for Journalism Hella Pick CBE (24 April 1929 – 4 April 2024); in 1960, was UN correspondent of The Guardian newspaper, tutored by chief US correspondent Alistair Cooke; awarded CBE in 2000; was Arts & Culture Programme Director at Institute for Strategic Dialogue, an independent think-tank based in London; author ofSimon Wiesenthal: A Life in Search of Justice, Weidenfeld & Nicolson, 1996; Guilty Victim – Austria from the Holocaust to Haider, I B Tauris & Co Ltd, 2000 and Invisible Walls, Weidenfeld & Nicolson, 2021 Gabriel Pogrund (born 1993 or 1994) is a journalist who has worked for the New Statesman, Shortlist, Ha'aretz and Jewish News and is currently Whitehall editor at The Sunday Times; won 2017 Young Journalist of the Year at the British Press Awards and in 2018 was a Stern Fellow at The Washington Post. 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Lignans and lignin differ in their molecular weight, the former being small and soluble in water, the latter being high polymers that are undigestable. Both are polyphenolic substances derived by oxidative coupling of monolignols. Thus, most lignans feature a C18 cores, resulting from the dimerization of C9 precursors. The coupling of the lignols occurs at C8. Eight classes of lignans are: "furofuran, furan, dibenzylbutane, dibenzylbutyrolactone, aryltetralin, arylnaphthalene, dibenzocyclooctadiene, and dibenzylbutyrolactol." Many lignans are metabolized by mammalian gut microflora, producing so-called enterolignans.
A similar role has been suggested for clays, though this speculation has not been supported through experimental evidence. The prebiotic synthesis of peptides from simpler molecules such as CO, NH3 and C, skipping the step of amino acid formation, is also very efficient.
== Causes == Prolidase deficiency is the result of mutations on the PEPD gene which is located on the "q", i.e., long, arm of chromosome 19 at region 1, band 3, sub-band 11 (notated as 19q13.11). This gene codes for the prolidase Enzyme, also known as peptidase-D. At least 19 different mutations in the PEPD gene have been identified in individuals affected by the disorder.
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244Cm(12C,xn)256−xNo (x=4,5) This reaction was studied in 1958 by scientists at the LBNL using a 95% 244Cm curium target. They were able to measure 7.43 MeV decays from250Fm, associated with a 3 s 254No parent activity, resulting from the reaction (246Cm,4n). The 3 s activity was later reassigned to252No, resulting from reaction (244Cm,4n). It could however not be proved that it was not due to the contaminant 250mFm, unknown at the time. Later work in 1959 produced 8.3 MeV alpha particles with a half-life of 3 s and a 30% SF branch. This was initially assigned to 254No and later reassigned to 252No, resulting from reaction with the 244Cm component in the target. The reaction was restudied in 1967 at the LBNL and a new activity assigned to 251No was measured.
Diarrhea Rash Fever Facial swelling Difficulty breathing Unusual bleeding Seizures This medicine is passed through breast milk, so its use during pregnancy or breastfeeding should only be done when clearly needed. Primaxin is cleared from the body by the kidneys, so it is important to tell one's doctor about any other drugs being taken that are also cleared through the kidneys (such as other antibiotics), especially for older patients, as kidney function declines with age. Patients who are allergic to penicillin, cephalosporins, and related drugs may react to imipenem. It is important tell one's doctor or pharmacist one's medical history, especially of brain disorders (e.g., seizures, head injury, tumor), kidney disease, liver disease, and stomach/intestinal diseases (e.g., colitis).
Although Liu's family was anxious of their future under communist rule and considered fleeing to Hong Kong, Liu Wenhui encouraged them to stay in China and claimed the new government would treat them well. Mao Zedong appointed Liu as a Vice Chairman of the Southwest Military and Political Committee, where he served until 1954. He was also elected a member of the National Committee of the Chinese People's Political Consultative Conference and a member of the National People's Congress, and was also appointed to the Central Military Commission. In June 1950, his 24th Army was merged with the 62nd Army of the People's Liberation Army. His nephew, Liu Yuanxuan, served as its deputy commander. In 1955, Liu was awarded the Order of Liberation, First Class for his role in the Chinese Civil War.
Sources: en.wikipedia.org
It is a chain of 28 amino acids, with an acetyl group attached to the first serine residue. The synthetic version replicates this sequence. Its molecular mass is about 3,108 daltons.
It is usually described as an immunomodulatory peptide rather than a classic hormone. It acts on immune cells through receptor pathways. No single endocrine organ target defines its function.
Several countries, including Italy and China, allow it for specific indications. The FDA has not approved it as a drug in the United States. Availability depends on local regulation.
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.