胸腺素α1 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-08-05 and is reviewed periodically as new material appears.
The name itself causes confusion, because several unrelated thymic peptides share the thymosin label. Thymosin beta-4, for example, is a different molecule with different functions. Naming conventions in the literature also mix descriptive research terms with assigned nonproprietary names, so a reader should confirm which entity a given paper addresses. Clarifying that point is usually the first step in interpreting any claim about this peptide.
Thymosin alpha-1 is a short peptide of 28 amino acid residues first described in the 1970s as a component of thymic extracts. Its N-terminal residue carries an acetyl group, and the sequence is highly conserved across mammalian species. The peptide is not encoded as a standalone gene product; it is released by proteolytic cleavage from the N-terminus of prothymosin alpha, a larger acidic nuclear protein. That precursor relationship places it within a broader family of thymic and immune-associated peptides that have been studied for decades.
The activity of this peptide is generally described as immunomodulatory rather than directly antimicrobial. Experimental work links it to signaling through certain Toll-like receptors on dendritic cells and to downstream maturation of antigen-presenting cells. Reported effects include expansion of T cell subsets, shifts in cytokine profiles, and increased natural killer cell activity. These observations come largely from cell culture and animal models, and the precise receptor-level events in humans remain incompletely characterized.
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 |
|---|---|---|
| Residue count | 28 amino acids | Acetyl group on the first residue |
| Approximate molecular mass | 3108 daltons | Calculated from the consensus sequence |
| Origin | Cleavage product of prothymosin alpha | Not encoded as a separate gene product |
| Primary research focus | Immune modulation | Studied in viral hepatitis and as a vaccine adjuvant |
| Common synonyms | Thymalfasin, Tα1, thymosin alpha 1 | Thymalfasin is the assigned nonproprietary name |
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.
市售的胸腺素α1通常以冻干粉形式提供，溶解后用于注射。其氨基酸组成包括多个酸性残基，因此在中性pH下带负电荷。该肽可溶于水和生理盐水，但在有机溶剂中溶解度有限。储存条件通常为冻干状态下负20摄氏度，溶解后需冷藏并避免反复冻融。常见的同义词包括胸腺肽α1、thymalfasin和Tα1。
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。
== June 30, 1915 (Wednesday) == Shabin-Karahisar uprising — Out of ammunition, the remaining men of the Armenian militia in the Giresun Province of Turkey engaged Ottoman troops in hand-to-hand combat. Ottoman soldiers defeated the militia and entered the fort the resistance had holed up in to massacre Armenian women, children and elderly inside. British destroyer HMS Lightning struck a mine in the Thames Estuary of England. She broke in two, the bow section sinking with the loss of fifteen of her crew. The stern section was towed to Sheerness, Kent where it was later scrapped. French commander Henri Gouraud was wounded at Gallipoli and replaced by his divisional commander, Maurice Bailloud. German submarine SM UC-2 struck a mine and sank in the North Sea. The Hay Gaol prison closed in Hay, New South Wales, Australia due to its small inmate population (it had only three prisoners). Born: Harry Weese, American architect, designer of the Washington Metro; in Evanston, Illinois, United States (d. 1998) Died: Preston Watson, 35, Scottish aviator, designer of aircraft that could be airborne under their own power; killed in a plane crash (b. 1880)
stringency The effect of conditions such as temperature and pH upon the degree of complementarity that is required for a hybridization reaction to occur between two single-stranded nucleic acid molecules. In the most stringent conditions, only exact complements can successfully hybridize; as stringency decreases, an increasing number of mismatches can be tolerated between the two hybridizing strands.
In his return game, he had the fifth highest percentage of first serve points won that year at 32.4%. His second serve has been a weakness for him in his earlier years, yet he has managed to turn it into a consistent strength. Zverev hit the most double faults on tour in 2016 and 2020. While it has improved since, it can still cause trouble for the German in big points.
=== Disorders involving the immune mechanism === 279 Disorders involving the immune mechanism 279.0 Deficiency of humoral immunity 279.00 Hypogammaglobulinemia unspecified 279.01 Selective IgA immunodeficiency 279.02 Selective IgM immunodeficiency 279.03 Other selective immunoglobulin deficiencies 279.04 Congenital hypogammaglobulinemia 279.05 Immunodeficiency with increased IgM 279.06 Common variable immunodeficiency 279.09 Other deficiency of humoral immunity 279.1 Deficiency of cell-mediated immunity 279.10 Immunodeficiency with predominant t-cell defect unspecified 279.11 DiGeorge syndrome 279.12 Wiskott–Aldrich syndrome 279.13 Nezelof syndrome 279.19 Other deficiency of cell-mediated immunity 279.2 Combined immunity deficiency Severe combined immunodeficiency 279.3 Unspecified immunity deficiency 279.4 Autoimmune disease not elsewhere classified 279.5 Graft-versus-host disease 279.8 Other specified disorders involving the immune mechanism 279.9 Unspecified disorder of immune mechanism
The deep veins of the lower limb include the common femoral vein, femoral vein, and the deep femoral vein; the popliteal vein, the tibial, and fibular veins. In the common femoral vein one valve is located above the saphenofemoral junction called the suprasaphenic valve. There are sometimes two valves in the same tract. In the femoral vein there are often three valves, the most constantly found valve is just below the joining of the deep femoral vein. The deep femoral vein and its perforators have valves. In the popliteal veins there are between one and three valves; in each posterior tibial vein there are between 8 and 19 valves, and in the anterior tibial veins there are between 8 and 11 valves. In the superficial veins there are between one and seven valves along the thigh portion of the great saphenous vein (GSV); two to six below the knee and one to four in the marginal veins of the foot. There is a valve at the termination of the GSV known as the terminal valve to prevent reflux from the femoral vein. A preterminal valve is located just below the openings of the tributaries to prevent reflux form these into the GSV. Incompetence of the GSV is a common cause of varicose veins. The valves also divide the column of blood into segments which helps move the blood unidirectionally to the heart. Their action is supported by the action of skeletal muscle pumps that contract and compress the veins. A skeletal muscle is confined in its fascia and contraction of the muscle which makes it wider results In compression on the vein that pushes the blood forward.
Sources: en.wikipedia.org
Due to the growing concerns of the high cost, health consequences, and illegal nature of some steroids, many organizations have formed in response and have deemed themselves "natural" bodybuilding competitions. In addition to the concerns noted, many promoters of bodybuilding have sought to shed the "freakish" perception that the general public has of bodybuilding and have successfully introduced a more mainstream audience to the sport of bodybuilding by including competitors whose physiques appear much more attainable and realistic. In natural contests, the testing protocol ranges among organizations from lie detectors to urinalysis. Penalties vary between organisations, from suspensions to strict bans from competition. Natural organizations also have their own list of banned substances and it is important to refer to each organization's website for more information about which substances are banned from competition. There are many natural bodybuilding organizations; some of the larger ones include: MuscleMania, Ultimate Fitness Events (UFE), INBF/WNBF, and INBA/PNBA. These organizations either have an American or worldwide presence and are not limited to the country in which they are headquartered.
In 1974, Steely Dan guitarist Jeff "Skunk" Baxter learned that his band was retiring from the road and that Donald Fagen and Walter Becker intended to work almost exclusively with session players in the future. In need of a steady gig, he joined the Doobie Brothers as third lead guitarist in the middle of their tour. He had previously worked with the band both live and in the studio, adding pedal steel guitar to both The Captain and Me ("South City Midnight Lady") and What Were Once Vices Are Now Habits ("Black Water", "Tell Me What You Want") and was already playing with the band as a special guest during that year's tour. What Were Once Vices Are Now Habits included the band's first No. 1 single, Simmons' signature tune "Black Water". It topped the charts in March 1975 and eventually propelled the album to multi-platinum status. Johnston's lyrical "Another Park, Another Sunday" (as a single, it featured "Black Water" as the B-side) and his horn-driven funk song "Eyes of Silver" also charted the year before at numbers 32 & 52, respectively. During this period and for several subsequent tours, the Doobies were often supported on stage by Stax Records mainstays the Memphis Horns. Live recordings with the horn section have aired on radio on the King Biscuit Flower Hour, but none have been officially released. The Memphis Horns also appeared as session players on multiple Doobies albums. By the end of 1974, Johnston's health was suffering from the rigors of the road.
=== Magnetic resonance guided focused ultrasound === In guided therapy, high-intensity focused ultrasound (HIFU) beams are focused on a tissue, that are controlled using MR thermal imaging. Due to the high energy at the focus, the temperature rises to above 65 °C (150 °F) which completely destroys the tissue. This technology can achieve precise ablation of diseased tissue. MR imaging provides a three-dimensional view of the target tissue, allowing for the precise focusing of ultrasound energy. The MR imaging provides quantitative, real-time, thermal images of the treated area. This allows the physician to ensure that the temperature generated during each cycle of ultrasound energy is sufficient to cause thermal ablation within the desired tissue and if not, to adapt the parameters to ensure effective treatment.
In another study, the combination of positively charged peptide amphiphiles and negatively charged long biopolymers led to the formation of hierarchically ordered membranes. When the two solutions are brought into contact, electrostatic complexation between the components of each solution creates a diffusion barrier that prevents the mixing of the solutions. Over time, an osmotic pressure difference drives the reptation of polymer chains through the diffusion barrier into the peptide amphiphile compartment, leading to the formation of fibers perpendicular to the interface that grow over time. These materials can be made in the form of flat membranes or as spherical sacs by dropping one solution into the other. These materials are robust enough to handle mechanically and a range of mechanical properties can be accessed by altering growth conditions and time. They can incorporate bioactive peptide amphiphiles, encapsulate cells and biomolecules, and are biocompatible and biodegradable.
Reactive neutrophilic cutaneous conditions constitute a spectrum of disease mediated by neutrophils, and typically associated with underlying diseases, such as inflammatory bowel disease and hematologic malignancy.
Sources: en.wikipedia.org
It is usually classified as an immunomodulatory peptide rather than a classical hormone. It derives from the larger protein prothymosin alpha and acts mainly on immune cells. The thymosin label covers a group of distinct peptides, so the naming can be misleading.
The two share a family name but have different sequences, sizes, and functions. Thymosin beta-4 is a 43-residue peptide associated with actin binding and cell migration. Thymosin alpha-1 is a 28-residue peptide linked mainly to immune signaling.
Thymalfasin is the assigned international nonproprietary name for the synthetic 28-residue peptide. Thymosin alpha-1 is the descriptive research name for the same molecule. Which term appears depends on the context and the regulatory document.
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.