This is a working overview of clinical endpoint, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-08-26 and is reviewed periodically as new material appears.
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.
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 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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular mass | Approximately 3,108 Da | Consistent with a 28-residue acetylated peptide |
| Residue count | 28 | Corresponds to the amino terminal region of prothymosin alpha |
| Appearance of dry powder | White to off-white solid | Slight variation between lots is normal |
| Solubility class | Freely soluble in water | Low solubility in most organic solvents |
| Common synonyms | Thymosin alpha 1, T alpha 1 | The numeral reflects an early fraction numbering scheme |
Thymosin alpha-1 is a synthetic peptide of 28 amino acid residues that corresponds to a naturally occurring fragment first isolated from thymus tissue. Its chain is acetylated at the amino terminus, a modification that shields the peptide from rapid cleavage by aminopeptidases. The molecule carries a net negative charge at physiological pH and dissolves freely in water. Researchers classify it as an immune-modulating agent rather than a classical hormone, because it acts on several cell types of both the innate and the adaptive immune system.
The peptide was identified during work in the 1970s on thymosin fraction 5, a partially purified extract of calf thymus. Investigators separated that mixture and characterized individual components, one of which they named thymosin alpha-1. The same compound later received the international nonproprietary name thymalfasin. Commercial material is produced by solid-phase peptide synthesis rather than by extraction, so synthetic and natural forms share an identical sequence. Naming conventions vary across the literature, and readers should distinguish the alpha-1 peptide from other thymosins that have unrelated sequences and functions.
Thymosin alpha 1 is a synthetic 28-amino-acid peptide first isolated in 1966 from thymosin fraction 5, a bovine thymus extract. Its chain begins with an acetylated serine residue and ends with asparagine. The native peptide carries a molecular mass near 3,108 daltons. Researchers classify it as an immunomodulatory agent rather than a hormone with a single endocrine target. Early work framed it as a thymus-derived factor that supports T-cell maturation. The synthetic form used in research and clinical products matches the natural sequence.
Immune signaling studies link thymosin alpha 1 to Toll-like receptor pathways, particularly TLR2 and TLR9, on dendritic cells and other antigen-presenting cells. Activation of these receptors promotes maturation of T cells and increases natural killer cell activity. The peptide shifts cytokine output toward a T helper 1 profile, raising interferon gamma and interleukin 2 while modulating interleukin 10. Whether these effects translate into clinical benefit for any specific disease remains a subject of debate. Reported outcomes vary across trials and populations.
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。
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。
In an eye surgery procedure, the usual correction or modification (or both) is of the upper and the lower eyelids, and of the surrounding tissues of the eyebrows, the upper nasal-bridge area, and the upper portions of the cheeks, which are achieved by modifying the periosteal coverings of the facial bones that form the orbit (eye socket). The periosteum comprises two-layer connective tissues that cover the bones of the human body:
== Society and culture == Prescriptions in the US for all sleeping pills (including zolpidem) steadily declined from around 57 million tablets in 2013, to around 47 million in 2017, possibly due to concern about prescribing addictive drugs amid the opioid crisis.
== Awards and honors == Machine Learning in the Chemical Sciences & Engineering Award, Camille and Henry Dreyfus Foundation, 2020 2015: OpenEye Outstanding Junior Faculty Award in Computational Chemistry, American Chemical Society
Sources: en.wikipedia.org
Ronald Dickson Woodroof (February 3, 1950 – September 12, 1992) was an American man who created what would become known as the Dallas Buyers Club in March 1988, one of several such AIDS buyers clubs that sprang up at the time. After learning he had contracted the human immunodeficiency virus (HIV) in 1985 and being diagnosed with AIDS, he created the group as part of his efforts to find and distribute drugs to treat AIDS at a time when the disease was poorly understood. He sued the United States Food and Drug Administration (FDA) over a ban on peptide T, a drug he was using. Woodroof's final years became the basis of the 2013 film Dallas Buyers Club, in which he was portrayed by Matthew McConaughey.
In January 2013, the FDA reported shortages of some, but not all, forms of doxycycline "caused by increased demand and manufacturing issues". Companies involved included an unnamed major generics manufacturer that ceased production in February 2013, Teva (which ceased production in May 2013), Mylan, Actavis, and Hikma Pharmaceuticals. The shortage came at a particularly bad time, since there were also shortages of an alternative antibiotic, tetracycline, at the same time. The market price for doxycycline dramatically increased in the United States in 2013 and early 2014 (from $20 to over $1800 for a bottle of 500 tablets), before decreasing again.
==== United States ==== In the United States, tianeptine is not considered by the Drug Enforcement Administration as a controlled substance or analogue thereof. However, its use in dietary supplements and food is unlawful. The Food and Drug Administration (FDA) has issued warnings, as recently as January 2024, about the dangers of recreational tianeptine use and the risks posed by adulterated dietary supplements containing undeclared tianeptine. On 6 April 2018, Michigan became the first US state to outlaw tianeptine sodium, classifying it as a schedule II controlled substance. The scheduling of tianeptine sodium is effective 4 July 2018. On 1 November 2019, Tianeptine became a Schedule II controlled dangerous substance as classified within the Uniform Controlled Dangerous Substances Act of the state of Oklahoma. On 15 March 2021, Alabama outlawed tianeptine, initially classifying it as a schedule II controlled substance. It was later reclassified as a schedule I controlled substance on 14 November 2021. On 1 July 2022, Tennessee outlawed tianeptine and adds "any salt, sulfate, free acid, or other preparation of tianeptine, and any salt, sulfate, free acid, compound, derivative, precursor, or preparation thereof that is substantially chemically equivalent or identical with tianeptine", classifying it as a schedule II controlled substance. On 22 December 2022, Ohio outlawed tianeptine, classifying it as a schedule I controlled substance with Ohio Governor Mike DeWine referencing the widespread availability of the chemical there as "gas-station heroin".
Sources: en.wikipedia.org
Doctors Without Borders said in late March that supplies of diagnostic equipment and personal protective equipment were stranded on the Chinese border. On 26 March, The New York Times reported that satellite imagery shared by the Royal United Services Institute showed that the illicit trafficking of coal and other goods had stopped, with the commercial vessels idling in their North Korean home ports. After shutting its border, North Korea's official exports to China were worth $610,000 in March 2020, down 96% from the previous year. According to the North Korean government, 10,000 people had been quarantined by the end of March. From 12 February, the 14-day quarantine on all foreigners (including their local staff) was extended to 30 days. Diplomats and other foreigners were evacuated to Vladivostok in March. By 27 March, according to North Korean media, there were only two foreigners in quarantine, and 2,280 North Koreans were under "medical observation" in areas such as South Phyongan province, North Phyongan province, Ryanggang province, and the city of Rason. The North Korean military fired five test missiles on two occasions in early March 2020, possibly as "an effort to ensure the country remains on the agenda for other nations amid the virus outbreak". More missile tests followed in late March, along with an announcement that the Supreme People's Assembly would meet in early April. Foreign observers said the government was trying to show confidence in their handling of the virus.
After a short career break, he returned to work in 1978, appearing in two stage productions: 1978's The Mighty Gents, winning a Drama Desk Award and a Clarence Derwent Award for his role as a wino, and White Pelicans. Freeman continued to work in theater and a year later, appeared in the Shakespearean tragedies Coriolanus, receiving the Obie Award in 1980 for the title role as well as Julius Caesar. In 1980, he had a small role as Walter in the drama Brubaker, which starred Robert Redford as a prison warden. Freeman next appeared in the television film, Attica (1980), which is about the 1971 Attica Prison riot and its aftermath. A year later he had a lead role in Peter Yates' Eyewitness with co-stars William Hurt and Sigourney Weaver. From 1982 to 1984, Freeman was a cast member of the soap opera Another World, playing architect Roy Bingham. After several small roles in dramas, he starred in Marie (1985), a film adaptation of Marie: A True Story by Peter Maas; he portrayed Charles Traughber. He also appeared in the miniseries The Atlanta Child Murders. Freeman also had a small role in the drama That Was Then... This Is Now, based on the novel of the same name by S. E. Hinton. In the mid-1980s, he began accepting prominent supporting roles in feature films, earning him a reputation for depicting wise, fatherly characters. In addition to television films, in 1987, Freeman played a violent street hustler, a role that diverged from his previous roles, in Street Smart co-starring Christopher Reeve and Kathy Baker.
== Sources == Johnson, Daniel; Hashaikeh, Raed; Hilal, Nidal (2021). "Basic principles of osmosis and osmotic pressure". In Hilal, Nidal; Ismail, Ahmad Fauzi; Khayet, Mohamed; Johnson, Daniel (eds.). Osmosis Engineering. Elsevier. pp. 1–15. doi:10.1016/B978-0-12-821016-1.00011-5. ISBN 978-0-12-821016-1.
Sources: en.wikipedia.org
The name reflects an early convention for naming thymus-derived fractions. The peptide is characterized and measured as a defined molecule, and it does not operate through a single classical endocrine axis.
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.