prothymosin alpha raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-05-26. Anything still debated is marked as such rather than presented as settled.
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.
临床研究将Tα1用于慢性病毒感染、肿瘤辅助治疗和疫苗佐剂等场景。部分试验报告了免疫学指标改善，但临床终点获益在不同研究中并不一致。系统综述指出，研究间在人群、剂量和联合方案上差异较大，难以汇总结论。因此，Tα1的确切临床地位仍属开放问题，需要更多高质量随机对照试验来澄清。其机制研究也需从体外实验向体内模型推进。
胸腺素α1对免疫系统的影响涉及多种细胞类型。研究表明，它可促进未成熟T细胞向成熟T细胞分化，并增强T细胞对抗原刺激的增殖反应。树突状细胞在Tα1存在下表达更高水平的共刺激分子，从而更有效地呈递抗原。此外，自然杀伤细胞的活性也观察到上升。这些效应并非直接杀伤病原体，而是调节宿主免疫应答的强度与方向。
| 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 |
Several factors accelerate degradation: alkaline pH, elevated temperature, exposure to oxidants, and the presence of residual moisture. Deamidation of asparagine residues and oxidation of methionine are the most commonly reported degradation routes. Because the peptide lacks disulfide bonds, it does not undergo the thiol-related aggregation seen in some other biologics, but physical aggregation can still occur at high concentration. Stability data are product-specific, and extrapolating shelf life between formulations is not reliable.
Lyophilized thymosin alpha-1 is generally stored at or below minus twenty degrees Celsius, protected from moisture and light. Short-term handling at ambient temperature is possible for dry powder, but reconstituted solutions degrade faster and are usually kept at two to eight degrees Celsius with a defined expiry of days rather than weeks. Repeated freeze-thaw cycles should be avoided because they promote aggregation and loss of potency. Exact limits depend on the formulation and should follow the supplier's documentation.
Identity and purity are normally assessed by reversed-phase high-performance liquid chromatography, which separates the peptide from related impurities and truncation products. Mass spectrometry confirms molecular mass and detects modifications such as deamidation or oxidation. Amino acid analysis and peptide mapping provide additional sequence-level confirmation. For research material, a certificate of analysis typically reports these results together with water content and counter-ion identity, since the lyophilized powder is often supplied as an acetate or trifluoroacetate salt.
Several names appear in the literature for this peptide, including thymalfasin and the abbreviation T-alpha-1. Naming conventions differ among research articles, regulatory documents, and supplier catalogs, which complicates literature searches. Both synthetic and recombinant production routes yield a peptide with the same 28-residue sequence as the thymic isolate. Because the thymosin label also covers unrelated peptides, sources should be compared by sequence rather than by name alone.
The peptide occurs naturally in thymic tissue and has been detected in serum and other biological fluids. Reported concentrations are low, and reliable measurement generally requires immunoassay or mass spectrometry with an enrichment step. It is released from a larger precursor, prothymosin alpha, by proteolytic cleavage, although the enzymes involved are not fully characterized. Whether circulating levels reflect thymic output specifically remains an open question.
Thymosin alpha 1 is a 28-amino-acid peptide first isolated from thymosin fraction 5, a bovine thymic extract. Its sequence begins with an acetylated serine residue and carries a high proportion of acidic residues, so the molecule has a net negative charge near neutral pH. Despite the shared name, it is unrelated in sequence to the thymosin beta family. Synthetic material prepared by solid-phase peptide synthesis is identical in sequence to the natural peptide.
Valerie Joy Beynon. For services to the community in Cobham, Surrey. Elizabeth Kay Billington. Chair, Kushti Bok and Vice-Chair, Dorset Council Gypsy Traveller Forum. For services to the Gypsy and Traveller Community in Dorset. William Archibald Bingham. Chair, Newcastle and Mourne Cancer Research Committee. For services to Cancer Research Fundraising in County Down. Chandra Shekhar Biyani. Consultant Urological Surgeon, Leeds Teaching Hospitals NHS Trust. For services to Medical Education. Reverend Christine Fiona Blackman. For services to the community in Reading, Berkshire. Derek John Bland. For services to the community in Northamptonshire. Roberta Vivian Lindsay Blyth. For services to the community in Roade, Northamptonshire. Winifred Patricia Bownes. Volunteer Coordinator, Cookstown Monday Club. For services to the community in Cookstown, County Tyrone. Mary Boyes. Cleaner, North Shore Academy, Stockton-on-Tees. For services to Education. John Robert Boyne-Aitken. For services to Heritage Crafts. Evelyn Lettita Bracey. For services to the community in Wantage, Oxfordshire. Paul Mark Brackley. Community First Responder, Oundle Community First Responders. For services to the community in Oundle and North Northamptonshire. Christopher Samuel Bradbury. For services to the community in Reedham, Norfolk. Moira Jeanette Brock. Founder and Principal, La Danse Fantastique. For services to Young People in Basildon, Essex. Anna Theresa Margaret Brown. For services to the NHS and to the community in the London Borough of Richmond-upon-Thames. Dennis Sydney Brown.
When the particles either pass through each other without interaction or elastically repel during the collision, the gained kinetic energy (related to speed) begins to revert into potential energy, driving the collided particles apart. The decelerating particles will return to the initial distance and beyond into infinity, or stop and repeat the collision (oscillation takes place). This shows that the system, which loses no energy, does not combine (bind) into a solid object, parts of which oscillate at short distances. Therefore, to bind the particles, the kinetic energy gained due to the attraction must be dissipated by resistive force. Complex objects in collision ordinarily undergo inelastic collision, transforming some kinetic energy into internal energy (heat content, which is atomic movement), which is further radiated in the form of photons – the light and heat. Once the energy to escape the gravity is dissipated in the collision, the parts will oscillate at a closer, possibly atomic, distance, thus looking like one solid object. This lost energy, necessary to overcome the potential barrier to separate the objects, is the binding energy. If this binding energy were retained in the system as heat, its mass would not decrease, whereas binding energy lost from the system as heat radiation would itself have mass. It directly represents the "mass deficit" of the cold, bound system. Closely analogous considerations apply in chemical and nuclear reactions.
==== The SEIR model with vital dynamics and constant population ==== As described in the example above, so many epidemic processes can be described with a SIR model. However, for many important infections, such as COVID-19, there is a significant latency period during which individuals have been infected but are not yet infectious themselves. During this period the individual is in compartment E (for exposed). Here, the formation of the next-generation matrix from the SEIR model involves determining two compartments, infected and non-infected, since they are the populations that spread the infection. So we only need to model the exposed, E, and infected, I, compartments. Consider a population characterized by a death rate
Halim, Adilla Nur; Abdul Rani, Aidatul Azura; et al. (Kadri, Rozeeda; Abdul Aziz, Farhana; Ridzuan, Mohd Naufal; Hassan, Ali Noor; Wazir, Maznah; Arzeni, Lydiawati) (2017). Amalan Perubatan Tradisional Melayu bagi Penjagaan Ibu-Ibu Selepas Bersalin di Negeri Kelantan [Traditional Malay Medical Practices for Postpartum Maternal Care in Kelantan] (PDF) (in Malay). Traditional and Complementary Medicine Practice Branch, Traditional and Complementary Medicine Division, Ministry of Health of Malaysia. pp. 1–90. ISBN 978-983-44782-9-2. Archived (PDF) from the original on 2 June 2025. Mazliadiyana, M; Nazrun, AS; Isa, NM (2017). "Optimum Dose of Sea Cucumber (Stichopus Chloronotus) Extract for Wound Healing" (PDF). Med & Health. 12 (1): 83–89. doi:10.17576/MH.2017.1201.09. Devi Oktaviani, Paramita; Wahjuningsih, Endah; Andriani, Dwi (2018). "Efektivitas Suplementasi Teripang Emas (Stichopus Hermanii) Dalam Mencegah Terjadinya Oral Candidiasis Pada Tikus Wistar" [Effectivity of Stichopus hermanii Supplementation to Prevent Oral Candidiasis on Rats]. Denta (Jurnal Kedokteran Gigi) (in Indonesian). 12 (1): 9–15. doi:10.30649/denta.v12i1.155. ISSN 1907-5987. Archived from the original on 1 June 2025. Text is licensed by DENTA (Journal Kedokteran Gigi) under CC BY-NC-SA 4.0 Hafiz Leong, Muhamad Nur; Mohd Fauzi, Noor Akhmazillah; Rahim Kamarudin, Kamarul; Mohamed Rehan, Aisyah (2021). "Investigation of Bioactive Compounds from Sea Cucumber Extract and Stingless Bee Honey Using Critical Literature Review and Bioinformatics Approach for Potential Synergy Combination".
Beyond its store endeavors, Jollibee also ventured into media, notably partnering with GMA for the children's magazine show Chikiting Patrol, which aired from 1996 to 2002. In 1998, Jollibee would expand to North America with its first United States location in Daly City, California. Jollibee first entered Europe in 2018 with the opening of a branch in Milan, Italy.
Sources: en.wikipedia.org
=== Cancer === HLA-G has been shown to be associated with tumor escape in cancers, because it causes the immune system to not pay attention to cancer cells. Because it is upregulated in cancer cells, it could serve as a potential target for immunotherapy. Monoclonal antibodies that bind to HLA-G have been used successfully against cancers as part of a strategy to inhibit immune checkpoints. HLA-G has potential utility as a tumor marker due to the large increase in HLA-G in many cancers, including breast cancer, ovarian cancer, and lung cancer. Increased expression of HLA-G has been associated with the metastatic potential of tumor cells.
In organic chemistry, a nitrile is any organic compound that has a −C≡N functional group. The name of the compound is composed of a base, which includes the carbon of the −C≡N, suffixed with "nitrile", so for example CH3CH2C≡N is called "propionitrile" (or propanenitrile). The prefix cyano- is used interchangeably with the term nitrile in industrial literature. Nitriles are found in many useful compounds, including methyl cyanoacrylate, used in super glue, and nitrile rubber, a nitrile-containing polymer used in latex-free laboratory and medical gloves. Nitrile rubber is also widely used as automotive and other seals since it is resistant to fuels and oils. Organic compounds containing multiple nitrile groups are known as cyanocarbons. For the organic compounds of the form R−N+≡C− instead of R−C≡N, they are referred to as isonitriles, or isocyanides. Inorganic compounds containing the −C≡N group are not called nitriles, but cyanides instead. Though both nitriles and cyanides can be derived from cyanide salts, most nitriles are not nearly as toxic.
== Etymology == The Oxford English Dictionary suggests that the European languages generally appear to have adopted the name from Turkish kahveh, about 1600, perhaps through Italian caffè. Arab qahwah, in Turkish pronounced kahveh, the name of the infusion or beverage; said by Arab lexicographers to have originally meant "wine" or some type of wine, and to be a derivative of a verb-root qahiya "to have no appetite". Another common theory is that the name derives from Kaffa Province, Ethiopia, where the species may have originated.
=== Against warts === Repeated daily application of silver nitrate can induce adequate destruction of cutaneous warts, but occasionally pigmented scars may develop. In a placebo-controlled study of 70 patients, silver nitrate given over nine days resulted in clearance of all warts in 43% and improvement in warts in 26% one month after treatment compared to 11% and 14%, respectively, in the placebo group.
=== Fossil fuel recovery === Carbon dioxide is used in enhanced oil recovery where it is injected into or adjacent to producing oil wells, usually under supercritical conditions, when it becomes miscible with the oil. This approach can increase original oil recovery by reducing residual oil saturation by 7–23% additional to primary extraction. It acts as both a pressurizing agent and, when dissolved into the underground crude oil, significantly reduces its viscosity, and changing surface chemistry enabling the oil to flow more rapidly through the reservoir to the removal well. Most CO2 injected in CO2-EOR projects comes from naturally occurring underground CO2 deposits. Some CO2 used in EOR is captured from industrial facilities such as natural gas processing plants, using carbon capture technology and transported to the oilfield in pipelines.
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.
它促进未成熟T细胞分化并增强成熟T细胞的增殖与细胞因子分泌。这些作用有助于放大抗原特异性免疫应答。