This is a working overview of prothymosin alpha, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-04-04 and is reviewed periodically as new material appears.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Acetylated peptide | N-terminal acetyl group blocks aminopeptidase attack |
| Residue count | 28 amino acids | Matches the N-terminus of prothymosin alpha |
| Molecular mass | About 3,108 Da | Value for the free, unmodified peptide |
| Isoelectric point | Approximately 4.2 | Acidic; net negative charge at neutral pH |
| Encoding gene | PTMA | Human gene for the precursor protein |
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.
Thymosin alpha 1 is a synthetic 28-amino-acid peptide first isolated in 1966 from thymosin fraction 5, a bovine thymus extract. Its chain begins with an acetylated serine residue and ends with asparagine. The native peptide carries a molecular mass near 3,108 daltons. Researchers classify it as an immunomodulatory agent rather than a hormone with a single endocrine target. Early work framed it as a thymus-derived factor that supports T-cell maturation. The synthetic form used in research and clinical products matches the natural sequence.
Clinical interest has centered on chronic viral hepatitis, on immune restoration in various conditions, and on use as an adjuvant intended to improve responses to vaccines. Trials have reported mixed results, and regulatory status differs sharply between countries; in some places it is a prescription product, while elsewhere it is sold without an approved therapeutic indication. Because published studies vary widely in design, population, and endpoints, comparisons across them are difficult and no single conclusion covers the whole literature.
Thymosin alpha 1 is a short peptide of 28 amino acid residues that derives from the amino terminal region of a larger precursor protein known as prothymosin alpha. The peptide carries an acetyl group on its first residue and contains no disulfide bonds or carbohydrate chains. Its sequence is highly conserved across mammalian species, which is one reason laboratories treat it as a molecule with a defined and reproducible structure rather than a variable tissue extract. The name follows an early naming convention for thymus-derived fractions and does not imply that the peptide acts as a hormone in the classical endocrine sense.
The MNHN continued to flourish during the 19th century, particularly under the direction of chemist Michel Eugène Chevreul, His research with animal fats revolutionised the manufacture of soap and of candles and led to his isolation of the heptadecanoic (margaric), stearic, and oleic fatty acids. In the medical field, he was first to demonstrate that diabetics excrete glucose. and to isolate creatine. His theories of colour "provided the scientific basis for Impressionist and Neo-Impressionist painting." Henri Becquerel held the chair for Applied Physics at the MNHN (1892–1908). By wrapping uranium salts in photographic paper, he first demonstrated the radioactive properties of uranium. In 1903, he shared the Nobel Prize in Physics with Pierre Curie and Marie Curie for the discovery of spontaneous radioactivity. Four generations of Becquerels held this chairmanship, from 1838 to 1948. As its collections grew, the MNHN was enlarged, with the construction of a new gallery of zoology. it was begun in 1877 and completed in 1889, for the 100th anniversary of the French Revolution. A new Gallery of Palaeontology and Comparative Anatomy was opened in 1898. The cost of construction drained the museum budget and it began to run short of funds. Its emphasis on teaching brought it into conflict with the University of Paris, which had better political connections. It gradually scaled back its program of teaching and focused primarily on research and the museum collections.
== Human exposure == A person can be exposed to uranium (or its radioactive daughters, such as radon) by inhaling dust in air or by ingesting contaminated water and food. The amount of uranium in air is usually very small; however, people who work in factories that process phosphate fertilizers containing uranium impurities, live near government facilities that made or tested nuclear weapons, live or work near a modern battlefield where depleted uranium weapons have been used, or live or work near a coal-fired power plant, facilities that mine or process uranium ore, or enrich uranium for reactor fuel, may have increased exposure to uranium. Houses or structures that are over uranium deposits (either natural or man-made slag deposits) may have an increased incidence of exposure to radon gas. The health impacts of natural and of depleted uranium are chemical rather than due to radiation. The Occupational Safety and Health Administration (OSHA) has set the permissible exposure limit for uranium exposure in the workplace as 0.25 mg/m3 over an 8-hour workday. The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 0.2 mg/m3 over an 8-hour workday and a short-term limit of 0.6 mg/m3. At 10 mg/m3, uranium is immediately dangerous to life and health. Most ingested uranium is excreted during digestion. Only 0.5% is absorbed when insoluble forms of uranium, such as its oxide, are ingested, whereas absorption of the more soluble uranyl ion can be up to 5%.
=== Modeling === Models inform the design of engineered biological systems by better predicting system behavior prior to fabrication. Synthetic biology benefits from better models of how biological molecules bind substrates and catalyze reactions, how DNA encodes the information needed to specify the cell and how multi-component integrated systems behave. Multiscale models of gene regulatory networks focus on synthetic biology applications. Simulations can model all biomolecular interactions in transcription, translation, regulation and induction of gene regulatory networks.
Secret police and armed forces were ordered to initiate large-scale incursions into the houses of protest planners and independent journalists "once each sector has been cleansed of wanted people", Ba'athist paramilitaries were to occupy these areas under protection of Syrian military and prevent survivors from returning to their homes Formation of "joint investigation committees" headed by leaders of the Baathist security departments across all provinces to incarcerate suspected activists and cross-examining them in prisons Transfer of the findings across all security branches for pinpointing of additional suspects The commands were passed down to the provincial leaders of the party who were instructed to swiftly execute the orders in their respective regions
== Medicinal Use == Traditional Medicine The resin of Croton lechleri, commonly known as sangre de drago, has a long history of medicinal use by indigenous peoples and is widely used in both urban and rural contexts in Peru and Ecuador, and to a lesser extent in other endemic countries.[8] For centuries, the sap has been used to cover abrasions, cuts, scratches, blisters, bites and stings to prevent bleeding, decrease inflammation, seal wounds and injuries to protect from infection. The sap dries quickly on soft, damaged tissue, forming a barrier similar in thickness to the skin removed, noted as something akin to a "second skin." Antimicrobial activity offered by the plant is further believed to offer protection to the injury. The formation of this resistant barrier is likely due to the saps ability to co-precipitate with surrounding proteins or extracellular matrix elements. The hemostatic qualities relevant in wound healing that are associated with sangre de grado are further relevant to Amazonian indigenous communities in arresting the large amounts of bleeding following childbirth. Beyond cutaneous ailments, the use of sangre de grado is taken orally for gastrointestinal disorders and irregularities including gastritis, gastric ulcers, intestinal infections, and inflammation.
Sources: en.wikipedia.org
The General Principles of Software Validation (FDA 2002) defines verification as "Software verification provides objective evidence that the design outputs of a particular phase of the software development life cycle meet all of the specified requirements for that phase." It also defines Validation as "Confirmation by examination and provision of objective evidence that software specifications conform to user needs and intended uses, and that the particular requirements implemented through software can be consistently fulfilled". The software validation guideline states: “The software development process should be sufficiently well planned, controlled, and documented to detect and correct unexpected results from software changes." Annex 11 states "The validation documentation and reports should cover the relevant steps of the life cycle." Weichel (2004) recently found that over twenty warning letters issued by the FDA to pharmaceutical companies specifically cited problems in Computer System Validation between 1997 and 2001. Probably the best known industry guidance available is the GAMP Guide, now in its fifth edition and known as GAMP5 published by ISPE (2008). This guidance gives practical advice on how to satisfy regulatory requirements.
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.
The causative agent of yaws is Treponema pallidum pertenue, which is transmissible by direct physical contact between infected people. Yaws is not sexually transmitted, and occurs in tropical, humid environments of Africa, Pacific Islands, Asia and South America. Unlike syphilis, which displays vertical transmission, one strain of T. p. pertenue researched was not vertically transmissible in a guinea pig model, and yaws cannot be spread from mother to offspring. Yaws appears as skin lesions, usually papules, commonly on the lower extremities, but present in other areas such as the arms, trunk and hands. Three stages of yaws disease have been documented: primary yaws which presents as inflamed sores on the lower body, secondary yaws which presents as a variety of skin abnormalities along with bone inflammation, and tertiary yaws, also referred to as latent yaws, which occurs when T. p. pertenue is serologically detected in the host but no clinical signs are displayed until relapse, which often occurs years later. Yaws is treated with antibiotics such as azithromycin and benzathine penicillin-G.
=== Ron Hites Award: for an exemplary paper published in the previous two volumes of the Journal of the American Society for Mass Spectrometry (since 2009) === 2022 Elyssia Gallagher 2019 Julia Laskin 2009 Alison Ashcroft
Sources: en.wikipedia.org
The 5th SFG was assigned responsibility for two sectors of western Iraq-the western and southern JSOAs (Joint Special Operations Areas-also known as Ops Boxes), one element termed FOB 51 (Operating Base 51) and commanded by AOB 520 and AOB 530, was composed of ODAs from 1st Battalion 5th SFG, they were stationed out of H-5 Air Base and were responsible for western Iraq. 2nd and 3rd Battalions deployed from Ali Al Salem Air Base as FOB 52 and 53 and were assigned to southern Iraq; attached to all teams were Special Tactics airmen from the 23rd Special Tactics Squadron to guide in close air support and manage the airspace above the ODA teams. A company element from the 19th SFG was attached to TF Dagger as were several regular and National Guard infantry companies to provide FOB security and to act as a QRF. As the prospect of war grew A company, 1st Battalion, 19th SFG, were tasked with liaison roles supporting conventional forces: ODA 911 and ODA 913 were to support the I MEF; ODA 914 was divided into two elements, one supporting the 3rd Infantry Division with ODA 916 and the other supporting British Forces; ODA 915 was attached to the 101st Airborne Division; and ODA 912 was tasked with providing PSD for General Harrell, the commander of CFSOCC (Combined Forces Special Operations Component Command). Responsibility for special operations in northern Iraq was assigned to CJSOTF-North (Combined Joint Special Operations Task Force-North/Task Force Viking) was formed around the 10th SFG, working alongside them would 3rd Battalion 3rd SFG.
==== Historical funding ==== Over the last century, the responsibility to allocate funding has shifted from the OD and Advisory Committee to the individual ICs and Congress increasingly set apart funding for particular causes. In the 1970s, Congress began to earmark funds specifically for cancer research, and in the 1980s there was a significant amount allocated for AIDS/HIV research. Funding for the NIH has often been a source of contention in Congress, serving as a proxy for the political currents of the time. During the 1980s, President Reagan repeatedly tried to cut funding for research, only to see Congress partly restore funding. The political contention over NIH funding slowed the nation's response to the AIDS epidemic; while AIDS was reported in newspaper articles from 1981, no funding was provided for research on the disease. In 1984 National Cancer Institute scientists found implications that "variants of a human cancer virus called HTLV-III are the primary cause of acquired immunodeficiency syndrome (AIDS)," a new epidemic that gripped the nation. In 1992, the NIH encompassed nearly 1 percent of the federal government's operating budget and controlled more than 50 percent of all funding for health research and 85 percent of all funding for health studies in universities. From 1993 to 2001 the NIH budget doubled. For a time, funding essentially remained flat, and for seven years after the 2008 financial crisis, the NIH budget struggled to keep up with inflation. In 1999 Congress increased the NIH's budget by $2.3 billion to $17.2 billion in 2000.
Tandem time-of-flight (TOF/TOF) is a tandem mass spectrometry method where two time-of-flight mass spectrometers are used consecutively. To record full spectrum of precursor (parent) ions TOF/TOF operates in MS mode. In this mode, the energy of the pulse laser is chosen slightly above the onset of MALDI for specific matrix in use to ensure the compromise between an ion yield for all the parent ions and reduced fragmentation of the same ions. When operating in a tandem (MS/MS) mode, the laser energy is increased considerably above MALDI threshold. The first TOF mass spectrometer (basically, a flight tube which ends up with the timed ion selector) isolates precursor ions of choice using a velocity filter, typically, of a Bradbury–Nielsen type, and the second TOF-MS (that includes the post accelerator, flight tube, ion mirror, and the ion detector) analyzes the fragment ions. Fragment ions in MALDI TOF/TOF result from decay of precursor ions vibrationally excited above their dissociation level in MALDI source (post source decay ). Additional ion fragmentation implemented in a high-energy collision cell may be added to the system to increase dissociation rate of vibrationally excited precursor ions. Some designs include precursor signal quenchers as a part of second TOF-MS to reduce the instant current load on the ion detector.
=== Compressor refrigerators === A vapor compression cycle is used in most household refrigerators, refrigerator–freezers and freezers. In this cycle, a circulating refrigerant such as R134a enters a compressor as low-pressure vapor at or slightly below the temperature of the refrigerator interior. The vapor is compressed and exits the compressor as high-pressure superheated vapor. The superheated vapor travels under pressure through coils or tubes that make up the condenser; the coils or tubes are passively cooled by exposure to air in the room. The condenser cools the vapor, which liquefies. As the refrigerant leaves the condenser, it is still under pressure but is now only slightly above room temperature. This liquid refrigerant is forced through a metering or throttling device, also known as an expansion valve (essentially a pin-hole sized constriction in the tubing) to an area of much lower pressure. The sudden decrease in pressure results in explosive-like flash evaporation of a portion (typically about half) of the liquid. The latent heat absorbed by this flash evaporation is drawn mostly from adjacent still-liquid refrigerant, a phenomenon known as auto-refrigeration. This cold and partially vaporized refrigerant continues through the coils or tubes of the evaporator unit. A fan blows air from the compartment ("box air") across these coils or tubes and the refrigerant completely vaporizes, drawing further latent heat from the box air. This cooled air is returned to the refrigerator or freezer compartment, and so keeps the box air cold.
The Green Berets would become actively involved against the Iranian-backed Special Groups, TF-17 relied a good deal on the Green Berets mentoring teams with the ISOF, the Green Berets placed ODA's in outfits such as the INIS and the Iraqi commando brigade. The ODA's consisted of 20 men and became — during the course of 2007 — the key to coalition operations in provinces such as Dhi Ghar or Maysan, the teams ensured that operations in the Shia militant strongholds had an Iraqi face to them — something of great symbolic importance to the US relationship with the Iraqi government. Green Berets and Polish GROM conducted Operation Jackal against insurgents in Diwaniyah in 2007. During May and June 2007, many Shia arrest operations were conducted by the British SAS and TF-17s Green Berets and Iraqi commandos led to Muqtada al-Sadr to initially flee to Iran, and in August he declared a Mahdi Army ceasefire with the coalition.
Sources: en.wikipedia.org
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.
The precursor, prothymosin alpha, is encoded by the PTMA gene in humans. The 28-residue peptide corresponds to the N-terminal segment released from that larger protein.
It is produced as a fragment of prothymosin alpha and is present in many tissues. Circulating concentrations are low, which makes routine measurement difficult.
Its sequence corresponds to the amino-terminal portion of prothymosin alpha, a larger protein present in many cell types. The isolated 28-residue peptide is a fragment of that protein rather than a separately encoded molecule, and laboratory material is produced by synthesis.