The short version of synthetic peptide fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
Biologically, the peptide is studied mainly in the context of immune cell development and regulation. It is produced in the thymus and in several other tissues, and it appears to influence the maturation and activity of T cells and other immune populations. Laboratory work describes effects on cytokine production, on the balance between T cell subsets, and on the function of dendritic cells. Much of this evidence comes from cell culture and animal models, so the extent to which the same pathways operate in humans remains an open question.
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.
| 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 |
Overall evidence quality varies considerably. A large share of published reports come from single centers, rely on surrogate immunological markers, or lack adequate control groups. Systematic reviews have highlighted this heterogeneity as a barrier to pooling results. Open questions include which patients, if any, might benefit, what treatment duration is appropriate, and whether any effect is independent of standard care. The peptide is often described as an immune modulator rather than a therapy for one disease, which complicates confirmatory trial design.
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.
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.
The two substrates of this enzyme are (S)-3-(imidazol-5-yl)lactic acid and oxidised nicotinamide adenine dinucleotide (NAD+). Its products are imidazole-4-pyruvic acid, reduced NADH, and a proton. The enzyme can use the alternative cofactor, nicotinamide adenine dinucleotide phosphate. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is (S)-3-(imidazol-5-yl)lactate:NAD(P)+ oxidoreductase. This enzyme is also called imidazol-5-yl lactate dehydrogenase.
== Awards & Sponsorship == In 2011 IBA was granted multiple local innovation awards, e.g. for its Streptamer technology, which allows reversible isolation and staining of antigen-specific T cells. Additionally, a diagnostic test developed by IBA and Fassisi for veterinary diseases was chosen as one of the top five innovations by the county of Göttingen in 2015. Furthermore, the company honors young scientists and participated in research consortia as well.
Gobies are dorsal finned like the lumpsuckers, yet they are not related. The Rhenanids became extinct over 200 million years before the first stingrays evolved, yet they share quite a similar appearance. Sandlance fish and chameleons have independent eye movements and focusing by use of the cornea. Acanthurids and mbuna are both aggressive, brightly colored fish that feed principally on aufwuchs, although the former is found only in marine environments, while the latter is only found in freshwater Lake Malawi. Cichlids of South America and the "sunfish" of North America are strikingly similar in morphology, ecology and behavior. The peacock bass and largemouth bass are excellent examples. The two fishes are not related, yet are very similar. Peacock bass are native of South America and is a Cichla. While largemouth bass are native to Southern USA states and is a sunfish. others will surely be described (but see the results based on DNA data). The antifreeze protein of fish in the Arctic and Antarctic, came about independently. AFGPs evolved separately in notothenioids and northern cod. In notothenioids, the AFGP gene arose from an ancestral trypsinogen-like serine protease gene. Electric fish: electric organs and electrosensory systems evolved independently in South American Gymnotiformes and African Mormyridae. Eel form are independent in the North American brook lamprey, neotropical eels, and the African spiny eel.
=== December === 1 December – NHS Grampian suspends visiting at Dr Gray's Hospital in Elgin following an outbreak of vomiting and diarrhoea. 3 December – A teenage boy is sentenced to life imprisonment with a minimum of 18 years for the murder of Danielle Davidson, who was stabbed with a Rambo-style knife following an argument over a e-scooter in Edinburgh in May 2023. A report by Audit Scotland says that fundamental changes are required in the way NHS Scotland provides services are "urgently needed" and that "difficult decisions" about whether some services can continue to be provided may need to be taken. 4 December – Finance Secretary Shona Robison delivers the 2024 budget, which includes planned changes to taxation and a pledge to scrap the two child benefit cap in Scotland. Rocket manufacturer Orbex announces plans to pause the construction of a spaceport in Sutherland in order to focus on the construction of its SaxaVord Spaceport site in Shetland. 6 December – First Minister John Swinney and Prime Minister Keir Starmer hold private talks about the Scottish Government's plans to scrap the two child benefit cap, which are later described as "helpful". A single case of bovine spongiform encephalopathy (BSE) has been identified on a farm in Dumfries and Galloway, authorities confirm. Professor Iain Gillespie resigns as principal of Dundee University following controversy over a £7,000 business trip he and a colleague took to Hong Kong. 7 December – Storm Darragh: An amber warning for high winds, and yellow warnings for wind and rain, are in place in Scotland.
Sources: en.wikipedia.org
Flotufolastat (18F), sold under the brand name Posluma, is a radioactive diagnostic agent for use with positron emission tomography (PET) imaging for prostate cancer. The active ingredient is flotufolastat (18F). Flotufolastat (18F) was approved for medical use in the United States in May 2023.
In his work with the late Hans Eysenck and subsequently with Con Stough on the role of basic information processing speed in human intelligence, he used ERP complexity measures to argue for a modification to the Hendrickson and Hendrickson error or "string theory" (so named as pins and string were used to make the measurements of EEG output) model of ability, to include a controlling role of attention. In related work on reaction time, he introduced a novel modification to the Jensen box, again controlling the role of attention in this task, and suggesting that under these conditions, intelligence is, as Arthur Jensen proposed, related to the rate of information processing defined in Fitts Law and using Claude Shannon's information metrics. At the University of Edinburgh he has investigated individual differences in intelligence, memory, and the genetic and environmental influences on social behaviours, such as coalition affiliation, politics, and altruism. Working with Ian Deary, Paul Irwing, and Geoff Derr, he reported evidence for substantial gender differences in intelligence in the form of much larger variance amongst males than amongst females, with more boys and men scoring in both the extreme high range, and in the extreme low range.
7 and Transitional Provisions) Order 1993 (S.I. 1993/2229) National Assistance (Assessment of Resources) (Amendment No.2) Regulations 1993 (S.I. 1993/2230) National Curriculum Council and School Examinations and Assessment Council (Designation of Staff) Order 1993 (S.I. 1993/2231) Export of Goods (Control) (Haiti) (Revocation) Order 1993 (S.I. 1993/2232) Motor Vehicles (Competitions and Trials) (Amendment) Regulations 1993 (S.I. 1993/2233) Road Traffic (Special Parking Areas) (London Boroughs of Bromley, Hammersmith and Fulham and Lewisham) (London Borough of Wandsworth) (Amendment) Order 1993 (S.I. 1993/2237) Housing (Extension of Right to Buy) Order 1993 (S.I. 1993/2240) Housing (Preservation of Right to Buy) Regulations 1993 (S.I. 1993/2241) Valuation Timetable (Scotland) Amendment (No.3) Order 1993 (S.I. 1993/2242) Housing (Right to Buy Delay Procedure) (Prescribed Forms) (Amendment) Regulations 1993 (S.I. 1993/2245) Housing (Right to Buy) (Prescribed Forms) (Amendment) Regulations 1993 (S.I. 1993/2246) Law Reform (Miscellaneous Provisions) (Scotland) Act 1990 (Commencement No.12) Order 1993 (S.I. 1993/2253) Public Trusts (Reorganisation) (Scotland) (No.2) Regulations 1993 (S.I. 1993/2254) Fish Health (Amendment) Regulations 1993 (S.I. 1993/2255) Royal National Hospital for Rheumatic Diseases National Health Service Trust (Transfer of Trust Property) Order 1993 (S.I. 1993/2256) St Peter's Hospital National Health Service Trust (Transfer of Trust Property) Order 1993 (S.I.
=== Safety === Like for other radioactive imaging agents in medicine, the applied amounts of radioactivity are so low that radiation-related adverse effects are very unlikely to occur, and have not been observed in practice. Consistent with the "tracer principle", the amount of pharmacologically active compound injected to a patient in the course of such an examination is extremely low. Adverse events, such as toxicity or allergic reactions, are thus highly improbable. No adverse or clinically detectable pharmacologic effects were observed following intravenous administration of 68Ga-Trivehexin when administered to cancer patients, and there were no significant changes in vital signs, laboratory study results, or electrocardiograms. In a study involving healthy volunteers, researchers again reported no adverse or clinically detectable pharmacologic effects and no significant changes in vital signs.
North Raleigh is an expansive, diverse, and fast-growing suburban area of the city that is home to established neighborhoods to the south along with many newly built subdivisions and along its northern fringes. The area generally falls North of Millbrook Road. It is primarily suburban with large shopping areas. Primary neighborhoods and subdivisions in North Raleigh include Bartons Creek Bluffs, Bedford, Bent Tree, Black Horse Run, Brier Creek, Brookhaven, Coachman's Trail, Crossgate, Crosswinds, Dominion Park, Durant Trails, Ethan's Glenn, Falls River, Greystone Village, Harrington Grove, Hidden Valley, Lake Park, Long Lake, North Haven, North Ridge, Oakcroft, Shannon Woods, Six Forks Station, Springdale Estates, Stonebridge, Stone Creek, Stonehenge, Summerfield, The Sanctuary, Valley Estates, Wakefield, Weathersfield, Windsor Forest, and Wood Valley. The area is served by a number of primary transportation corridors including Glenwood Avenue US 70, I-540, Wake Forest Road, Millbrook Road, Lynn Road, Six Forks Road, Spring Forest Road, Creedmoor Road, Leesville Road, Norwood Road, Strickland Road, and North Hills Drive.
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.
The name reflects an early convention for naming thymus-derived fractions. The peptide is characterized and measured as a defined molecule, and it does not operate through a single classical endocrine axis.