This is a working overview of prothymosin alpha, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-02-06 and is reviewed periodically as new material appears.
Thymosin alpha-1 is a synthetic peptide of 28 amino acids, corresponding to the N-terminal fragment of prothymosin alpha. Its sequence begins with acetylation at the N-terminus, a modification that affects stability and receptor interaction. The peptide is acidic, with a calculated isoelectric point near 4.2, and carries no disulfide bonds, so its secondary structure is largely flexible in solution. Molecular mass is approximately 3108 daltons. The native form was first isolated from bovine thymus tissue, while pharmaceutical material is produced by solid-phase peptide synthesis.
Within the immune system, the peptide acts on several cell types rather than a single target. Reported activities include promotion of T-cell maturation, enhancement of natural killer cell activity, and modulation of cytokine production by dendritic cells and macrophages. Some of these effects appear to operate through toll-like receptor signaling, though the precise receptor-level mechanism remains debated. Whether the observed immune changes translate into clinical benefit is a separate question and depends on the indication studied.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic peptide, 28 residues | N-terminal fragment of prothymosin alpha |
| Molecular mass | About 3108 Da | Acetylated form |
| Isoelectric point | Near 4.2 | Acidic peptide |
| Appearance | White to off-white lyophilized powder | Common supplied form |
| Typical storage | -20 °C or below, dry | Solution stability is lower |
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.
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.
Long-term storage is generally at minus twenty degrees Celsius or colder, preferably desiccated and protected from light. Lyophilized material is more stable than reconstituted solution, which degrades faster at room temperature. Stability depends on pH, ionic strength, and the presence of oxidising agents. Published stability data for the peptide are limited, so storage claims in catalogues should be treated as general guidance rather than measured guarantees. Freeze-thaw cycles are kept to a minimum.
Identity and purity are normally confirmed by reversed-phase high-performance liquid chromatography and mass spectrometry. The expected mass for the acetylated 28-residue peptide is close to 3108 daltons, and a mass shift indicates a modification or truncation. Peptide mapping after enzymatic digestion can resolve sequence-level questions. Counter-ion content, water content, and residual solvents are separate quality attributes that a certificate of analysis may or may not report. Aggregation is monitored by size-exclusion chromatography when relevant.
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Cry of Fear is a 2013 indie survival horror video game developed and published by the Swedish game development studio Team Psykskallar. It is derived from a mod for the video game Half-Life developed by the same team a year prior. Cry of Fear follows the story of Simon Henriksson, a 19-year-old Swedish male suffering from depression and anxiety, exploring the city of Stockholm. Combining elements of survival horror and first-person shooter mechanics, Cry of Fear challenges players to navigate through a haunting urban environment filled with monsters and unsettling occurrences. The story explores themes of mental illness and trauma. The game was praised for its atmospheric tension, narrative, and innovative use of the Half-Life engine. Cry of Fear received the Mod DB awards for Best Single Player Game of the Year and the Community Award.
==== Emulsions ==== Emulsions are mixtures of immiscible liquids. Water-in-oil emulsions of estradiol benzoate were evaluated as long-acting preparations for use by intramuscular injection in the 1940s and 1950s. Formulations of estradiol benzoate alone under the brand name Menformon-Emulsion and with progesterone under the brand name Di-Pro-Emulsion were previously marketed. A 10 mg dose of estradiol benzoate in emulsion by intramuscular injection is said to have a duration of about 2 to 3 weeks. This is similar to the duration of an aqueous suspension of 10 mg estradiol benzoate or an oil solution of 10 mg estradiol valerate. Emulsions of steroids by intramuscular injection have similar properties (e.g., duration) relative to aqueous suspensions. Painful injection site reactions have been reported with emulsions similarly to suspensions.
Sources: en.wikipedia.org
In 2024, D'Souza criticized the International Olympic Committee (IOC), alleging institutional corruption and inadequate athlete compensation. He also advocated for the abolition of the World Anti-Doping Agency (WADA), characterizing it as an "anti-science" extension of the IOC. D'Souza also argued that the Olympic program includes insignificant sports. He states that he has never used performance-enhancing drugs himself. By late 2025, he had been replaced as chief executive by Maximilian Martin, investment banker and bitcoin miner. Olympians attached to the organisation as of 2023 include Brett Fraser, Roland Schoeman, and Christina Smith. In 2025, Brett Hawke was named head swim coach. Other people include geneticist George Church. German biotech billionaire Christian Angermayer is co-founder of the organisation. D'Souza became Thiel's confidant in the process of leading the Gawker plan for him, and through Thiel's introduction, a friend of Angermayer. According to The Spectator, in December 2022, as D'Souza and other members of their small community of gay tech founders were about to gather for the annual party at Thiel's residence in Miami (formerly held while travelling the world, until Thiel had children), D'Souza came up with the idea of the Enhanced Games. After receiving positive feedback from Thiel (while other investors thought that the idea was "outside the Overton window"), D'Souza spent the next six months developing the project. Later, after reading about the plan on German media, Angermayer notified D'Souza that he wanted to come on board as a co-founder.
== Risk factors == Although it is difficult to predict which individuals will be affected from drug-induced long QT syndrome, there are general risk factors that can be associated with the use of certain medications. Generally, as the dose of a drug increases, the risk of QT prolongation increases as well. In addition, factors such as rapid infusion, concurrent use of more than one drug known to prolong QT interval, diuretic treatment, electrolyte derangements (hypokalemia, hypomagnesemia, or hypocalcemia), advanced age, bradyarrhythmias, and female sex have all been shown to be risk factors for developing drug-induced QT prolongation. TdP has been shown to occur up to three times more often in female patients compared with males, likely as a result of post-pubertal hormonal influence on cardiac ion channels. The QTc interval is longer in females, as well as having a stronger response to IKr-blocking agents. In males, the presence of testosterone upregulates IKr channels and therefore decreases QT interval. Stated otherwise, estrogens prolong the QT interval, while androgens shorten it and decrease the response to IKr-blocking agents. Structural heart disease, such as heart failure, myocardial infarction, and left ventricular hypertrophy, are also risk factors. Diuretic-induced hypokalemia and/or hypomagnesemia taken for heart failure can induce proarrthymia. The ischemia that results from myocardial infarctions also induce QT prolongation.
=== Endocrinopathies === The most commonly included disorders of the endocrine system are congenital hypothyroidism (CH) and congenital adrenal hyperplasia (CAH). Testing for both disorders can be done using blood samples collected on the standard newborn screening card. Screening for CH is done by measuring thyroxin (T4), thyrotropin (TSH) or a combination of both analytes. Elevated 17α-hydroxyprogesterone (17α-OHP) is the primary marker used when screening for CAH, most commonly done using enzyme-linked immunosorbant assays, with many programs using a second tier tandem mass spectrometry test to reduce the number of false positive results. Careful analysis of screening results for CAH may also identify cases of congenital adrenal hypoplasia, which presents with extremely low levels of 17α-OHP. When the immunoassay method is utilized as a screening method for quantifying 17α-OHP in dried blood spots, it exhibits a significant rate of false positive results. As per the clinical practice guideline issued by the Endocrine Society in 2018, employing LC-MS/MS to measure 17α-OHP and other adrenal steroid hormones (such as 21-deoxycortisol and androstenedione) is recommended as a supplementary screening approach to enhance the accuracy of positive predictions. CH was added to many newborn screening programs in the 1970s, often as the second condition included after PKU.
Sources: en.wikipedia.org
It corresponds to a fragment of the larger protein prothymosin alpha, which is present in many tissues. The isolated 28-amino-acid peptide was originally obtained from thymus preparations, and the pharmaceutical product is synthesized rather than extracted. The term therefore describes both a natural fragment and a manufactured drug substance.
Thymosin alpha-1 is a single defined 28-residue peptide, while the broader family includes unrelated peptides such as thymosin beta-4. The shared name reflects historical isolation from thymus tissue rather than a common structure. Confusion between the two is common in older literature.
No single pathway fully accounts for its reported effects. Several studies describe interaction with innate immune receptors and downstream cytokine changes, but the complete picture is not settled. Open questions remain about which effects occur at physiological concentrations.
Aliquots are typically frozen well below zero Celsius and thawed only once, since repeated cycles promote aggregation and loss. Dilution into a neutral buffer limits degradation during short working periods, and prolonged storage at room temperature is avoided.