Thymosin alpha 1 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-04-14. Anything still debated is marked as such rather than presented as settled.
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.
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.
Lyophilized material is generally held at reduced temperature to slow degradation, and storage at minus twenty degrees Celsius or lower is common practice for long-term retention. Short-term working portions are often kept between two and eight degrees Celsius. Once dissolved, the peptide is less stable than the dry powder, and repeated freeze-thaw cycles are associated with loss of material and with aggregate formation. Vials are usually allowed to reach room temperature before opening so that condensation does not introduce moisture, and solutions are protected from light where practical.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography, which separates the peptide from closely related impurities and from truncated or oxidized variants. Mass spectrometry supplies the molecular mass and confirms the expected sequence length, while amino acid analysis can be used to check composition. Because the molecule has no chromophore beyond the peptide backbone, ultraviolet detection is typically performed at a low wavelength, where baseline interference from solvents and buffers is a practical concern. Water content and counter-ion content are often reported alongside purity.
| 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 |
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。
Quantifying thymosin alpha-1 in a sample usually relies on reverse-phase high-performance liquid chromatography. The peptide lacks strong chromophores, so detection often occurs at 214 nm, where the peptide backbone absorbs. Mass spectrometry provides confirmatory identification and can detect sequence variants or truncations. Immunoassays have been used in biological matrices, but they may cross-react with related fragments. For purity assessment, chromatographic peak area gives the main component percentage, while mass accuracy verifies molecular identity.
The lyophilized peptide is generally stable for extended periods when kept cold and dry. Once dissolved, aqueous solutions are less stable; hydrolysis, oxidation, and aggregation can degrade the material. Storage at -20 °C or lower slows these processes. Repeated freeze-thaw cycles are best avoided because they can promote aggregation. The exact shelf life depends on formulation, pH, and concentration, so stability studies are typically performed for each specific product.
=== Graphene aerogel === An aerogel made of graphene layers separated by carbon nanotubes was measured at 0.16 milligrams per cubic centimeter. A solution of graphene and carbon nanotubes in a mold is freeze-dried to dehydrate the solution, leaving the aerogel. The material has superior elasticity and absorption. It can recover completely after more than 90% compression, and absorb up to 900 times its weight in oil, at a rate of 68.8 grams per second.
Schwartz Award (for Significant Contributions in Cancer Research Diagnostics American Association for Clinical Chemistry) 2015–Present: Wittliff Lecture Series at San Marcos Academy honoring his career contributions 2021 John G. Tower Distinguished Alumni Award, Texas Tech University, Kappa Sigma Fraternity
== Structure == The core of the signal peptide contains a long stretch of hydrophobic amino acids (about 5–16 residues long) that has a tendency to form a single alpha-helix and is also referred to as the "h-region". In addition, many signal peptides begin with a short positively charged stretch of amino acids, which may help to enforce proper topology of the polypeptide during translocation by what is known as the positive-inside rule. Because of its close location to the N-terminus it is called the "n-region". At the end of the signal peptide there is typically a stretch of amino acids that is recognized and cleaved by signal peptidase and therefore named cleavage site. This cleavage site is absent from transmembrane-domains that serve as signal peptides, which are sometimes referred to as signal anchor sequences. Signal peptidase may cleave either during or after completion of translocation to generate a free signal peptide and a mature protein. The free signal peptides are then digested by specific proteases. Moreover, different target locations are aimed by different types of signal peptides. For example, the structure of a target peptide aiming for the mitochondrial environment differs in terms of length and shows an alternating pattern of small positively charged and hydrophobic stretches. Nucleus-targeting signal peptides can be found at both the N-terminus and the C-terminus of a protein and are in most cases retained in the mature protein.
Sources: en.wikipedia.org
ATP + H2O + oligopeptide [oligopeptide - binding protein][side 1] = ADP + phosphate + oligopeptide [side 2] + [oligopeptide - binding protein][side 1] 7.4.2.7 ABC-type alpha-factor-pheromone transporter The enzyme appears in viruses and cellular organisms characterized by the presence of two similar ATP-binding domains/proteins and two integral membrane domains/proteins. Does not undergo phosphorylation during the transport process. A yeast enzyme that exports the α-factor sex pheromone. ATP + H2O + alpha factor [side 1] = ADP + phosphate + alpha factor [side 2] 7.4.2.8 ABC-type protein-secreting ATPase The expected taxonomic range for this enzyme is: Archaea, Bacteria. A non-phosphorylated, non-ABC (ATP-binding cassette) ATPase that is involved in protein transport. ATP + H2O + cellular protein [side 1] = ADP + phosphate + cellular protein [side 2] 7.4.2.9 ABC-type dipeptide transporter The enzyme appears in viruses and cellular organisms. ATP-binding cassette (ABC) type transporter, characterized by the presence of two similar ATP-binding domains/proteins and two integral membrane domains/proteins. A bacterial enzyme that interacts with an extracytoplasmic substrate binding protein and mediates the uptake of dipeptides and tripeptides.
== January 18, 1982 (Monday) == A simultaneous crash of four T-38 jets killed the four pilots for the Thunderbirds stunt flying team of the U.S. Air Force, as they were flying in formation at Indian Springs Air Force Auxiliary Field in Nevada in preparation of a flying show set for March. U.S. Army Lieutenant Colonel Charles R. Ray, an assistant military attache in France, was shot and killed, in front of his home in Paris as he was leaving his apartment to drive to his job at the U.S. Embassy. Georges Ibrahim Abdallah, a terrorist from Lebanon who had founded the Lebanese Armed Revolutionary Factions, would be arrested almost three years later in Lyon, convicted of complicity in the murder of Lt. Col. Ray and of the March 31 killing of Israeli diplomat Yacov Barsimantov, and would serve 41 years of a life sentence before being released in 2025. Born: Joanna Newsom, American folk singer; in Grass Valley, California Phạm Phương Thảo, Vietnamese folk singer; in Nghi Lộc district, Nghệ An province Died: Juan O'Gorman, 76, Mexican artist and architect, was found dead from an apparent suicide. Frank C. Baxter, 85, American literature professor and television host of the CBS series Shakespeare on TV and the ABC series Telephone Time, winner of seven Emmy Awards, including Outstanding Male Performer (1954), and 1960 for Outstanding Male Personality (1960). Josef Mai, 94, German fighter ace with 30 victories in World War One; Trent Lehman, 20, former American child actor known for Nanny and the Professor, hanged himself.
Bruising and bleeding can result from decreased production of blood clotting factors. Hepatic encephalopathy (HE) occurs when ammonia and related substances build up in the blood. This build-up affects brain function when they are not cleared from the blood by the liver. Symptoms can include unresponsiveness, forgetfulness, trouble concentrating, changes in sleep habits, or psychosis. One classic physical examination finding is asterixis. This is the asynchronous flapping of outstretched, dorsiflexed hands. Fetor hepaticus is a musty breath odor resulting from increased dimethyl sulfide and is a feature of HE. Increased sensitivity to medication can be caused by decreased metabolism of the active compounds. Acute kidney injury (particularly hepatorenal syndrome). Cachexia associated with muscle wasting and weakness.
Sources: en.wikipedia.org
== Prognosis == The prognosis of primary Raynaud syndrome is often excellent, with no factor to mortality and little morbidity overall. In some very rare cases, gangrene has been known to develop. The prognosis of secondary Raynaud is related to the course of the underlying disease, and how effective blood flow-restoring maneuvers are.
At longer times, after some but not all of the ion channels have recovered, the axon can be stimulated to produce another action potential, but with a higher threshold, requiring a much stronger depolarization, e.g., to −30 mV. The period during which action potentials are unusually difficult to evoke is called the relative refractory period.
The regulation of proline biosynthesis can depend on the initial controlling step through negative feedback inhibition. In E. coli, proline allosterically inhibits Glutamate 5-kinase which catalyzes the reaction from L-glutamate to an unstable intermediate L-γ-Glutamyl phosphate. Arginine synthesis also utilizes negative feedback as well as repression through a repressor encoded by the gene argR. The gene product of argR, ArgR an aporepressor, and arginine as a corepressor affect the operon of arginine biosynthesis. The degree of repression is determined by the concentrations of the repressor protein and corepressor level.
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.
Cool storage below freezing is usual for long-term retention, with a desiccant and protection from light. Portions are often split before first use to avoid repeated handling.