The short version of prothymosin alpha fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-07-19 and is reviewed periodically as new material appears.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Findings across trials are mixed; some report changes in selected immune markers, while others find no clear clinical benefit. Many studies are small and define outcomes differently, which limits comparison. Regulatory approval is confined to a few countries, and the compound is not an approved drug in the United States or most of Europe.
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.
Practical handling focuses on limiting adsorption and contamination. The peptide dissolves readily in water, and dilute solutions tend to adhere to plastic and glass surfaces, so an inert carrier protein or a defined buffer can reduce losses in laboratory work. Workers also record the counter-ion form, since an acetate or trifluoroacetate salt changes the mass balance of the weighed powder. Documentation of lot number, purity value, and storage history supports reproducibility when results from different laboratories are compared.
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 |
|---|---|---|
| First described | 1977 | Reported as a component of thymosin fraction 5 |
| Sequence length | 28 amino acids | N-terminal residue is acetylated |
| Net charge at neutral pH | Negative | Reflects a high proportion of acidic residues |
| Principal studied uses | Chronic hepatitis B and vaccine adjuvant | Research uses outnumber approved indications |
| Regulatory status | Approved in a limited number of countries | Not approved in the United States or most of Europe |
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 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.
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.
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.
Thymosin alpha 1 is a short peptide of 28 amino acid residues that derives from the amino terminal region of a larger precursor protein known as prothymosin alpha. The peptide carries an acetyl group on its first residue and contains no disulfide bonds or carbohydrate chains. Its sequence is highly conserved across mammalian species, which is one reason laboratories treat it as a molecule with a defined and reproducible structure rather than a variable tissue extract. The name follows an early naming convention for thymus-derived fractions and does not imply that the peptide acts as a hormone in the classical endocrine sense.
==== Oxidation ==== Magnesium is widely used as a reducing agent. Although it oxidises in air, it does not need an inert atmosphere for storage; it forms a thin layer of magnesium oxide that protects the rest of the metal. Direct reaction of magnesium with air or oxygen at ambient pressure forms only the "normal" oxide MgO. However, this oxide may be combined with hydrogen peroxide to form magnesium peroxide, MgO2, and at low temperature the peroxide may be further reacted with ozone to form magnesium superoxide Mg(O2)2. Magnesium reacts with nitrogen in the solid state if it is powdered and heated to just below the melting point, forming magnesium nitride Mg3N2. Magnesium reacts with water at room temperature, though it reacts much more slowly than calcium, a similar group 2 metal. When submerged in water, hydrogen bubbles form slowly on the surface of the metal; this reaction happens much more rapidly with powdered magnesium. The reaction also occurs faster with higher temperatures (see § Safety precautions). Magnesium's reversible reaction with water can be harnessed to store energy and run a magnesium-based engine. Magnesium also reacts exothermically with most acids such as hydrochloric acid (HCl), producing magnesium chloride and hydrogen gas, similar to the HCl reaction with aluminium, zinc, and many other metals. Although it is difficult to ignite in mass or bulk, magnesium metal will ignite. Magnesium may also be used as an igniter for thermite, a mixture of aluminium and iron oxide powder that ignites only at a very high temperature.
Additionally, cinnarizine can be used in scuba divers without an increased risk of central nervous system oxygen toxicity which can result in seizures, and is a high risk in closed-circuit oxygen diving. This is also relevant to divers who could potentially have to undergo hypobaric decompression therapy, which uses high oxygen pressure and could also be affected by any cinnarizine-induced CNS oxygen toxicity risk. However, cinnarizine does not heighten toxicity risk, and in fact, evidence even seems to suggest that cinnarizine may be beneficial in helping delay O2 toxicity in the central nervous system. There is also evidence that cinnarizine may be used as an effective anti-asthma medication when taken regularly. Beyond an anti-vertigo treatment, cinnarizine could be also viewed as a nootropic drug because of its vasorelaxating abilities (due to calcium channel blockade), which happen mostly in brain, and the fact that it is also used as a labyrinthine sedative. Cinnarizine inhibits the flow of calcium into red blood cells, which increases the elasticity of the cell wall, thereby increasing their flexibility and making the blood less viscous. This allows the blood to travel more efficiently and effectively through narrowed vessels in order to bring oxygen to damaged tissue. It is also effectively combined with other nootropics, primarily piracetam; in such combination each drug potentiates the other in boosting brain oxygen supply.
==== Type distribution ==== Individual muscles tend to be a mixture of various fiber types, whose proportions vary depending on the actions of that muscle. For instance, in humans, the quadriceps muscles contain ~52% type I fibers, while the soleus is ~80% type I. The orbicularis oculi muscle of the eye is only ~15% type I. Motor units within the muscle, however, have minimal variation between the fibers of that unit. It is this fact that makes the size principle of motor unit recruitment viable. The total number of skeletal muscle fibers has traditionally been thought not to change. It is believed there are no sex or age differences in fiber distribution; however, proportions of fiber types vary considerably from muscle to muscle and person to person. Among different species there is much variation in the proportions of muscle fiber types. Sedentary men and women (as well as young children) have 45% type II and 55% type I fibers. People at the higher end of any sport tend to demonstrate patterns of fiber distribution e.g. endurance athletes show a higher level of type I fibers. Sprint athletes, on the other hand, require large numbers of type IIX fibers. Middle-distance event athletes show approximately equal distribution of the two types. This is also often the case for power athletes such as throwers and jumpers. It has been suggested that various types of exercise can induce changes in the fibers of a skeletal muscle. It is thought that by performing endurance type events for a sustained period of time, some of the type IIX fibers transform into type IIA fibers.
=== Pathology === As a bioactive lipid, ceramide has been implicated in a variety of physiological functions including apoptosis, cell growth arrest, differentiation, cell senescence, cell migration and adhesion. Roles for ceramide and its downstream metabolites have also been suggested in a number of pathological states including cancer, neurodegeneration, diabetes, microbial pathogenesis, obesity, and inflammation. Several distinct ceramides potently predict major adverse cardiovascular events (MACE), namely C16:0, C18:0, and C24:1, although C24:0 has an inverse relationship. C16-C18 are harmful in the liver. Ceramide levels are positively correlated with inflammation and oxidative stress in the liver, and the onset and progression of non-alcoholic fatty liver disease (NAFLD) is associated with elevated ceramide in hepatocytes. Dietary intake of saturated fat has been shown to increase serum ceramide and increase insulin resistance. Although initial studies showed increased insulin resistance in muscle, subsequent studies also showed increased insulin resistance in liver and adipose tissue. Interventions that limit ceramide synthesis or increase ceramide degradation lead to improved health (reduced insulin resistance and reduced fatty liver disease, for example). Ceramides induce skeletal muscle insulin resistance when synthesized as a result of saturated fat activation of TLR4 receptors. Unsaturated fat does not have this effect. Ceramides induce insulin resistance in many tissues by inhibition of Akt/PKB signaling.
Historically, the aristocracy was divided between Conservatives and Liberals. However, when Gladstone committed to home rule for Ireland, Britain's upper classes largely abandoned the Liberal party, giving the Conservatives a large permanent majority in the House of Lords. Following the Queen, High Society in London largely ostracized home rulers and Liberal clubs were badly split. Joseph Chamberlain took a major element of upper-class supporters out of the Party and into a third party called Liberal Unionism on the Irish issue. It collaborated with and eventually merged into the Conservative party. The Gladstonian liberals in 1891 adopted The Newcastle Programme that included home rule for Ireland, disestablishment of the Church of England in Wales, tighter controls on the sale of liquor, major extension of factory regulation and various democratic political reforms. The Programme had a strong appeal to the nonconformist middle-class Liberal element, which felt liberated by the departure of the aristocracy.
Sources: en.wikipedia.org
Eyes: Chronic conjunctivitis, scars on cornea, corneal opacities, early cataracts Respiratory tracts: Obstructive and/or restrictive disease, pulmonary fibrosis, aggravation of tuberculosis and chronic bronchitis Neurological system: Impairment of memory, finer motor skills, numbness, etc. Psychological problems: Post traumatic stress disorder (PTSD) Children's health: Peri- and neonatal death rates increased. Failure to grow, intellectual impairment, etc. Missing or insufficient fields for research are female reproduction, chromosomal aberrations, cancer, immune deficiency, neurological sequelae, post traumatic stress disorder (PTSD) and children born after the disaster. Late cases that might never be highlighted are respiratory insufficiency, cardiac insufficiency (cor pulmonale), cancer and tuberculosis. Bhopal now has high rates of birth defects and records a miscarriage rate 7x higher than the national average. A 2014 report in Mother Jones quotes a "spokesperson for the Bhopal Medical Appeal, which runs free health clinics for survivors" as saying "An estimated 120,000 to 150,000 survivors still struggle with serious medical conditions including nerve damage, growth problems, gynaecological disorders, respiratory issues, birth defects, and elevated rates of cancer and tuberculosis."
The preparation of THC was reported in JACS in 1965. That procedure called for the intramolecular alkyl lithium attack on a starting carbonyl to form the fused rings, and a tosyl chloride mediated formation of the ether.
In North America: Alphora, Delmar and NAEJA, all Canada. AMRI, Aptuit, Cambridge Major, ChemBridge, Innocentive, Irix Pharmaceuticals and PharmEco, all USA. In Europe: Carbogen-Amcis, Switzerland; Chemcomm, Germany; ChemDiv, Russia; Clauson-Kaas, Denmark; Enamine Ltd, Ukraine; Girindus, Germany; Nerviano Medical Sciences, Italy; Recipharm, Sweden; Serichim, Italy; Solvias, Switzerland, Netherlands. In Asia: BioDuro, Medicilon, Pharmaron and WuXi AppTec, all China; Acoris, Aptuit Laurus, Biocon/Syngene, Chembiotek, Chempartner and ProCitius, all India; NARD Institute and Riken, both Japan. The business of CROs is usually done through a "pay for service" arrangement. Unlike manufacturing companies, invoicing of CROs is not based on unit product price, but on full-time equivalents (FTEs), or the cost of a scientist working one year on a given customer assignment. Companies offering both contract research and manufacturing services (CRAMS) combine the activities of CROs and CMOs. Their history is either a forward integration of a CRO, which adds industrial scale capabilities, or backwards integration of a CMO. As there are only limited synergies (>90% of the projects end at the sample preparation stage), it is questionable if one-stop shops really fulfil a need. Large fine chemical companies consider the preparation of samples more as marketing tool (and expense) rather than a profit contributor.
Delirium has been noted from discontinuation from clorazepate. A benzodiazepine dependence occurs in approximately one third of patients who take benzodiazepines for longer than 4 weeks, which is characterised by a withdrawal syndrome upon dose reduction. When used for seizure control, tolerance may manifest itself with an increased rate of seizures as well an increased risk of withdrawal seizures. In humans, tolerance to the anticonvulsant effects of clorazepate occurs frequently with regular use. Due to the development of tolerance, benzodiazepines are, in general, not considered appropriate for the long-term management of epilepsy; increasing the dose may result only in the developing of tolerance to the higher dose combined with worsened adverse effects. Cross-tolerance occurs between benzodiazepines, meaning that, if individuals are tolerant to one benzodiazepine, they will display a tolerance to equivalent doses of other benzodiazepines. Withdrawal symptoms from benzodiazepines include a worsening of pre-existing symptoms as well as the appearance of new symptoms that were not pre-existing. The withdrawal symptoms may range from mild anxiety and insomnia to severe withdrawal symptoms such as seizures and psychosis. Withdrawal symptoms can be difficult in some cases to differentiate between pre-existing symptoms and withdrawal symptoms. Use of high doses, long-term use and abrupt or over-rapid withdrawal increase the severity of withdrawal syndrome. However, tolerance to the active metabolite of clorazepate may occur more slowly than with other benzodiazepines.
Sources: en.wikipedia.org
While the UK was an early leader with the Modern Slavery Act 2015, techUK argues that the law has become an obsolete "reporting law" that allows companies to merely state they are doing nothing. They have called for the UK to adopt mandatory human rights due diligence laws, similar to the EU's Corporate Sustainability Due Diligence Directive, to force technology companies to meaningfully investigate and address human rights abuses.
The Asian Federation for Psychotherapy published a code of ethics in 2008 with the following principles: Beneficence, Responsibility, Integrity, Justices, and Respect. Similar to the APA code, it provides detailed instructions for the conduct of psychologists, specifically psychotherapists. Russia, India, Iran, Kazakhstan, China, Malaysia, and Japan are member countries. The National Latina/o Psychological Association adopted their current ethical guidelines in 2018, stating that "the traditional Eurocentric foundations in mainstream psychology have provided culturally bound knowledge about worldviews, ways of living, and cultural practices." Their principles are: Respect and Responsibility, Ethical Dilemmas, Ethical Decision-Making and Legal Responsibility, Consultation, Justice and Advocacy, Self-Awareness and Social-Consciousness, Action and Accountability, Training and Creating Infrastructure, and Mentorship.
=== Indonesia === Acetorphine is considered as a class 1 narcotic drug in Indonesia, along with etorphine and dihydroetorphine. A class 1 narcotic drug can only be used for scientific development purposes and not be used in therapy.
Sources: en.wikipedia.org
Trials differ in patient population, dose schedule, background treatment, and the endpoints used to judge success. Many are small and single-center, so random variation can dominate the reported effects.
Authorization is limited to a small number of countries and covers specific indications such as chronic hepatitis B and vaccine adjuvant use. Availability and labelling differ by jurisdiction.
Most reviews describe it as an immunomodulatory agent with an uncertain clinical effect. They generally call for larger, better-controlled trials before firm conclusions are drawn.
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.