prothymosin alpha raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-06-26. Anything still debated is marked as such rather than presented as settled.
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.
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。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C129H215N33O55 | Calculated for the acetylated 28-residue peptide |
| Appearance | White to off-white powder | Lyophilized solid recovered from aqueous buffer |
| Solubility | Freely soluble in water | Typically dissolved in water or buffer before use |
| Typical storage | -20 C or below, desiccated | Protect from light and avoid repeated freeze-thaw cycles |
| Identity testing | Reverse-phase HPLC with mass spectrometry | Retention time and measured mass confirm the sequence |
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.
Early work on thymic extracts in the 1960s described a heat-stable acidic fraction containing many polypeptides. Separation of that mixture yielded individual components, and thymosin alpha-1 was named as one of them on the basis of assays for T-cell activity. The first preparations came from calf thymus, while subsequent research and clinical material has been chemically synthesized. Nomenclature in older papers is inconsistent, and the same peptide sometimes appears under different designations, which complicates literature searches.
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.
The compound has been investigated as an adjunct in chronic viral hepatitis and as a vaccine adjuvant, with results that vary by study design and population. Regulators in some countries have approved a synthetic form for specific indications, while other agencies have not. Whether the peptide produces consistent clinical benefit across diverse patient groups is still an open question, and many trials have been small. Its status is therefore best described as investigational in many contexts and established only narrowly.
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.
Laboratory work indicates that the peptide acts on cells of both the innate and adaptive immune systems. Reported effects include signalling through Toll-like receptors on dendritic cells, enhanced T-cell maturation, and increased natural killer cell activity. These actions are described largely from cell-culture and animal experiments, and the precise receptor-level events remain incompletely defined. Studies in humans have generally measured immune markers rather than a single defined molecular target. The resulting picture remains partly descriptive.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
8969, which declared the third Friday of August a special holiday in Davao City. He expressed disinterest with his new post, describing it as less engaging compared to his time as mayor. He attempted to resign in 1999 after his son Paolo was accused of mauling a hotel guard, but House Speaker Manny Villar and President Joseph Estrada declined his resignation. After embarking on a diplomatic trip to Brazil between 2000 and 2001, Duterte made a brief stopover in the United States, but as he was about to step out of the Los Angeles International Airport, he was held up by law enforcement officers and interrogated about his travel documents. After the stopover, Duterte never again returned to the United States. In 2001, he was elected mayor of Davao for a fourth unconsecutive term, defeating his former ally, incumbent Mayor Benjamin de Guzman; his estranged sister Jocelyn attempted to run against him as well, but was disqualified by the Commission on Elections. He was re-elected in 2004, defeating de Guzman for the second time, and in 2007 with virtually no opposition. In 2003, Duterte formally laid out the scope of Davao City's Chinatown, the first Chinatown in Mindanao, along the newly renamed Magsaysay Street, while establishing the Davao City Chinatown Development Council to oversee the area's development.
In February 2022, The Wall Street Journal reported that "Mental-health professionals around the country are growing increasingly concerned about the effects on teen girls of posting sexualized TikTok videos." In March 2022, a coalition of US state attorneys general launched an investigation into TikTok's effect on children's mental health. In June 2022, TikTok introduced the ability to set a maximum uninterrupted screen time allowance, after which the app blocks off the ability to navigate the feed. The block only lifts after the app is exited and left unused for a set period of time. Additionally, the app features a dashboard with statistics on how often the app is opened, how much time is spent browsing it and when the browsing occurs. Since 2021, it has been reported that accounts engaging with contents related to suicide, self-harm, or eating disorders were shown more similar videos. Some users were able to circumvent TikTok filters by writing in code or using unconventional spelling. The company has faced multiple lawsuits pertaining to wrongful deaths. TikTok said it is working to break up these "rabbit holes" of similar recommendations. US searches for eating disorder receive a prompt that offers mental health resources. In 2021, the platform revealed that it will be introducing a feature that will prevent teenagers from receiving notifications past their bedtime. The company will no longer send push notifications after 9 pm to users aged between 13 and 15. For 16 to 17 year olds, notifications will not be sent after 10 pm.
=== Unilever === In 1989, Unilever acquired Biocon Biochemicals Ltd. in Ireland and merged it with its subsidiary Quest International. Unilever later sold its holdings to the Indian owners of Biocon Limited in 1998, effectively reuniting the partnered corporations.
Fourth, TFEU article 106(1) requires that the state may not grant special or exclusive rights for undertakings that distort competition, and states that (2) competition law applies to services of general economic interest, unless it obstructs their tasks in law or fact (e.g. in providing public services). Under TFEU art 107(1) no state aid that distorts competition is allowed, but aid is allowed (2) for individual consumers, without discrimination, and (3) for economic development, particularly to tackle underemployment. The Procurement Directive 2014/24/EU, on government procurement in the EU sets standards for open tenders when outsourcing public services to private companies.
== Disorders == Hyperactivity of theca cells causes hyperandrogenism, and hypoactivity leads to a lack of estrogen. Granulosa cell tumors, while rare (less than 5% of ovarian cancers), may occur in both granulosa cells and theca cells. Thecomas are benign proliferations of theca cells that may present with hormonal dysfunction. Dysfunction in theca cells is one of the leading cause of endocrine-based infertility, as either hyperactivity or hypoactivity of the theca cells can lead to fertility problems.
Sources: en.wikipedia.org
=== Physicochemical === PAHs are nonpolar and lipophilic. Larger PAHs are generally insoluble in water, although some smaller PAHs are soluble. The larger members are also poorly soluble in organic solvents and in lipids. The larger members, such as perylene, are strongly colored.
== Legacy == David Lipman, director of the National Center for Biotechnology Information, has called Dayhoff the "mother and father of bioinformatics". Her seminal contributions as the mother of the science of bioinformatics, now routinely used as part of the process for naming bacteria, were acknowledged with a bacterium being named after her in 2020, Enemella dayhoffiae. Dayhoff was inducted into the Maryland Women's Hall of Fame in March 2026.
Newsom declared a state of emergency on March 4, 2020, after the first death in California attributable to the novel SARS-CoV-2 coronavirus disease (COVID-19). His stated intention was to help California prepare for and contain COVID-19's spread. The emergency declaration allowed state agencies to more easily procure equipment and services, share information on patients and alleviated restrictions on the use of state-owned properties and facilities. Newsom also announced that mitigation policies for the state's estimated 108,000 unsheltered homeless people would be prioritized, with a significant push to move them indoors. Newsom issued an executive order that allowed the state to commandeer hotels and medical facilities to treat COVID-19 patients and permitted government officials to hold teleconferences in private without violating open meeting laws. He also directed local school districts to make their own decisions on school closures, but used an executive order to ensure students' needs would be met whether or not their school was physically open. The U.S. Department of Agriculture approved the Newsom administration's request to offer meal service during school closures, which included families being able to pick up those meals at libraries, parks, or other off-campus locations. Roughly 80% of students at California's public schools receive free or reduced-price meals. This executive order included continued funding for remote learning opportunities and child care options during workday hours.
=== Protein degradation === Protein degradation may take place intracellularly or extracellularly. In digestion of food, digestive enzymes may be released into the environment for extracellular digestion whereby proteolytic cleavage breaks proteins into smaller peptides and amino acids so that they may be absorbed and used. In animals the food may be processed extracellularly in specialized organs or guts, but in many bacteria the food may be internalized via phagocytosis. Microbial degradation of protein in the environment can be regulated by nutrient availability. For example, limitation for major elements in proteins (carbon, nitrogen, and sulfur) induces proteolytic activity in the fungus Neurospora crassa as well as in of soil organism communities. Proteins in cells are broken into amino acids. This intracellular degradation of protein serves multiple functions: It removes damaged and abnormal proteins and prevents their accumulation. It also serves to regulate cellular processes by removing enzymes and regulatory proteins that are no longer needed. The amino acids may then be reused for protein synthesis.
== Mechanism == At the cellular level, metabolic myopathies lack some kind of enzyme or transport protein that prevents the chemical reactions necessary to create adenosine triphosphate (ATP). ATP is often referred to as the "molecular unit of currency" of intracellular energy transfer. The lack of ATP prevents the muscle cells from being able to function properly. Some people with a metabolic myopathy never develop symptoms due to the body's ability to produce enough ATP through alternative pathways (e.g. the majority of those with AMP-deaminase deficiency are asymptomatic). H2O + ATP → H+ + ADP + Pi + energy → muscle contraction ATP is needed for muscle contraction by two processes:
Sources: en.wikipedia.org
It is a 28-amino-acid peptide originally purified from a bovine thymic extract and later produced synthetically. It is studied mainly for its effects on immune cell function.
No. The two peptides share part of a name but differ in length, sequence, and net charge. Literature searches that treat them as one compound return misleading results.
Solid-phase peptide synthesis is the usual route, and recombinant expression has also been described. Both approaches produce material matching the natural sequence.
它不是经典的内分泌激素，而是一种免疫调节肽。其作用主要通过局部免疫细胞间的信号传递实现，而非经血液循环作用于远隔器官。