The short version of synthetic peptide fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-10-06 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Class | Synthetic peptide | 28 residues; not a small-molecule compound |
| Molecular mass | About 3,106 Da | Monoisotopic mass of the unmodified chain |
| N-terminal group | Acetylated serine | Present in both native and synthetic forms |
| Secondary structure | Disulfide-constrained loop | One bridge between two cysteine residues |
| Typical source | Solid-phase synthesis | Early isolates came from bovine thymus extracts |
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, which separates the target peptide from truncated or chemically modified byproducts. Mass spectrometry confirms the expected molecular mass and can indicate acetylation state or sequence errors. Amino acid analysis and peptide mapping supply complementary sequence-level information, while endotoxin testing is relevant for preparations intended for cell or animal work. Purity figures reported by suppliers refer to the method used and are not directly comparable across laboratories unless conditions are stated.
Lyophilized material is typically treated as a hygroscopic solid that should be brought to room temperature before the container is opened, which limits condensation on the powder. Reconstitution is commonly done with sterile water or a buffered diluent, and gentle mixing is preferred over vigorous agitation to reduce foaming and surface adsorption. Because peptides can bind to plastic and glass, diluents containing a small amount of carrier protein are sometimes used in laboratory work. Working solutions are generally aliquoted and prepared fresh rather than subjected to repeated freezing and thawing.
Stability depends on temperature, pH, and the number of freeze-thaw events the sample has experienced. Freeze-dried material is commonly held at -20 °C or colder, while reconstituted liquid is kept cold and used within a short window. Extreme pH and prolonged light exposure can promote deamidation, oxidation, or aggregation, particularly at asparagine and methionine positions. Adsorption to container walls can lower the measured concentration of a dilute solution even when the peptide molecules themselves remain intact.
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.
The peptide was described in the 1970s as a component of thymic extracts, and early research focused on restoring immune function in immunodeficiency states. A synthetic version entered clinical development in the 1980s and is approved as a drug in several countries for conditions such as chronic hepatitis B and certain immunodeficiencies. Approval status varies widely by jurisdiction, and in the United States it is not an approved therapeutic. Regulatory and clinical positions differ, so statements about efficacy should be tied to specific indications and studies.
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。
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。
In the 20th century, as it spread to the United States and Western countries, spiritual elements of acupuncture that conflicted with scientific knowledge were sometimes abandoned in favor of simply tapping needles into acupuncture points.
== Research == Research has identified at least one other possible marker that may appear earlier and exclusively during pregnancy. For example, early pregnancy factor (EPF) can be detected in blood within 48 hours of fertilization, rather than after implantation. However, its reliable use as a pregnancy test remains unclear as studies have shown its presence in physiological situations besides pregnancy, and its application to humans remains limited.
== Gliding scandals == During the 2020 Women's World Gliding Championships at Lake Keepit, Australia, the home team captain Terry Cubley (Executive Officer of the GFA) was charged with unsporting behaviour for hacking the official tracking system to bypass the mandatory 15 minute delay and forward real time competitors' positions to his team, granting a tactical advantage. An investigation revealed that Matt Gage had been closely involved with the developers of the tracking system, and was aware of an undocumented back door that allowed the team captain (Terry Cubley) to bypass the 15 minute delay. This real-time information was relayed by the team captain over the radio to the Australian pilots. This was the first time in the sport's history that an entire team had been penalised for unsporting behaviour, with the Competition Director applying a penalty of 25 points per pilot per day. Controversially the pilots involved were spared disqualification only receiving a relatively trivial points reduction (compared to a competing pilot who was disqualified for infringing airspace earlier in the competition). Following a subsequent GFA investigation two of the Australian Team admitted to cheating and the GFA made a formal apology to the FAI and the wider gliding community. Terry Cubley was removed from his role as Vice President of the IGC, but chose to remain as Executive Officer of the GFA . The pilots involved chose to appeal against this decision, resulting in the longest and most comprehensive investigation in the FAIs history.
=== Drug policy in Brazil === Laws prohibiting the recreational use of drugs, such as cannabis, coca and opium, were introduced to the Penal Code of Brazil in 1940, when certain narcotic drugs were criminalized within Brazilian territory through the 1940 Penal Code (Law No. 2,848/1940), as set forth in Article 281:
Sources: en.wikipedia.org
The basic mammalian body type is quadrupedal, with most mammals using four limbs for terrestrial locomotion; but in some, the limbs are adapted for life at sea, in the air, in trees or underground. The bipeds have adapted to move using only the two lower limbs, while the rear limbs of cetaceans and the sea cows are mere internal vestiges. Mammals range in size from the 30–40 millimetres (1.2–1.6 in) bumblebee bat to the 30 metres (98 ft) blue whale—possibly the largest animal to have ever lived. Maximum lifespan varies from two years for the shrew to 211 years for the bowhead whale. All modern mammals give birth to live young, except the five species of monotremes, which lay eggs. The most species-rich group is the viviparous placental mammals, so named for the temporary organ (placenta) used by offspring to draw nutrition from the mother during gestation. Most mammals are intelligent, with some possessing large brains, self-awareness, and tool use. Mammals can communicate and vocalize in several ways, including the production of ultrasound, scent marking, alarm signals, singing, echolocation; and, in the case of humans, complex language. Mammals can organize themselves into fission–fusion societies, harems, and hierarchies—but can also be solitary and territorial. Most mammals are polygynous, but some can be monogamous or polyandrous. Domestication of many types of mammals by humans played a major role in the Neolithic Revolution, and resulted in farming replacing hunting and gathering as the primary source of food for humans.
To allow bone mineralization to take place, osteoblasts secrete tissue-nonspecific alkaline phosphatase into the osteoid to break down pyrophosphate, an extracellular inhibitor of hydroxyapatite precipitation which otherwise prevents precipitation of hydroxyapetite crystals from extracellular fluid which is supersaturated in Ca2+ and PO3−4 ions.
== Awards == German Innovation Award. Excellence in Business to Business – Pharmaceuticals, Winner 2019 German Innovation Award, Fortibone January 2020 Nutra Ingredients Awards. Ingredient of the Year: Healthy Ageing – Fortibone, GELITA – 2018, Winner 2018, January 2020 Life PR Award: German Innovation Award in gold for innovative detergent additive Novotec CB800, June 6, 2018 Nutraceuticals World: Top 100 Innovative Companies in Germany, Category "Innovative Processes" Cannes Corporate Media & TV Awards 2016: Four Dolphins for the company Video "You can see". Gold in category corporate videos and silver in the categories marketing films – B2B, information films and visitors films German Brand Award for successful brand management in the category "Industry Excellence in Branding", 2016 "Intermedia-globe Award" in gold, World Media Festival June 22, 2016 Frost & Sullivan Award, "European Health Ingredient of the Year" – 2008 New Hope, "GELITA Wins Frost & Sullivan Award European Health Ingredient of the Year 2008"
Autoimmune diseases predominantly begin in adulthood, although they can start at any age. The initial recognition of autoimmune diseases dates back to the early 1900s, and since then, advances in understanding and management of these conditions have been substantial, though much more is needed to fully unravel their complex etiology and pathophysiology.
Extracellular matrix has been found to cause regrowth and healing of tissue. Although the mechanism of action by which extracellular matrix promotes constructive remodeling of tissue is still unknown, researchers now believe that Matrix-bound nanovesicles (MBVs) are a key player in the healing process. In human fetuses, for example, the extracellular matrix works with stem cells to grow and regrow all parts of the human body, and fetuses can regrow anything that gets damaged in the womb. Scientists have long believed that the matrix stops functioning after full development. It has been used in the past to help horses heal torn ligaments, but it is being researched further as a device for tissue regeneration in humans. In terms of injury repair and tissue engineering, the extracellular matrix serves two main purposes. First, it prevents the immune system from triggering from the injury and responding with inflammation and scar tissue. Next, it facilitates the surrounding cells to repair the tissue instead of forming scar tissue. For medical applications, the required ECM is usually extracted from pig bladders, an easily accessible and relatively unused source. It is currently being used regularly to treat ulcers by closing the hole in the tissue that lines the stomach, but further research is currently being done by many universities as well as the U.S. Government for wounded soldier applications. As of early 2007, testing was being carried out on a military base in Texas. Scientists are using a powdered form on Iraq War veterans whose hands were damaged in the war.
Sources: en.wikipedia.org
== Structure == The C4 Domain at the C-terminus is not removed in the post-translational process, and as a result, the structure of the fibers are linked in a "head-to-head" format instead of in a parallel fashion. It also lacks a glycine in every third amino acid residue that is responsible for the tight collagen helix, as a result it will be more flexible and kinked than other types of collagen.
=== Heritable connective tissue disorders === Hereditary connective tissue disorders are a diverse set of broad, single-gene disorders that impact one or more of the main components of connective tissues, such as ground substance (glycosaminoglycans), collagen, or elastin. Many result in anomalies of the skeleton and joints, which can substantially impair normal growth and development. In contrast to acquired connective tissue diseases, these conditions are uncommon.
=== Pharmacokinetics === The bioavailability of lemborexant is good and is at least 87%. The time to peak levels of lemborexant is 1 to 3 hours. A high-fat and high-calorie meal has been found to delay the time to peak levels by 2 hours. Its plasma protein binding in vitro is 94%. Lemborexant is metabolized primarily by CYP3A4 and to a lesser extent by CYP3A5. The "effective" half-life of lemborexant is 17 to 19 hours while its terminal elimination half-life is 55 hours. The medication is excreted in feces (57%) and to a lesser extent urine (29%).
== History == Insulin was discovered by Sir Frederick G Banting, Charles H Best, and JJR Macleod from the University of Toronto in 1921 as an injectable agent. German researchers first introduced the idea of inhalable insulin in 1924. Years of failure followed until scientists realized they might be able to use new technologies to turn insulin into a concentrated powder with particles sized for inhalation. In the 1980s Nektar Therapeutics, based on work by A. Carl Leopold on vitrifying proteins, developed technology to make insulin into small particles, technology then licensed to Pfizer. Alkermes developed a delivery device that they licensed to Eli Lilly and Company. Once concrete methods were developed, human tests began in the late 1990s. In January 2006, the U.S. Food and Drug Administration (FDA) approved the use of Exubera, a form of inhalable insulin developed by Pfizer. It was approved in the UK in August 2006 but reimbursed by the National Health Service only for people who had problems with needles. It was not reimbursed by any U.S. insurer. A 2007 systematic review concluded that the inhaled hexameric insulin (Exubera) "appears to be as effective, but no better than injected short-acting insulin. The additional cost is so much more that it is unlikely to be cost-effective." In 2007, Pfizer announced that it would no longer manufacture or market Exubera. According to Chairman and CEO Jeffrey Kindler this was because Exubera "failed to gain acceptance among patients and physicians".
Sources: en.wikipedia.org
Its sequence corresponds to the amino-terminal portion of prothymosin alpha, a larger protein present in many cell types. The isolated 28-residue peptide is a fragment of that protein rather than a separately encoded molecule, and laboratory material is produced by synthesis.
The single bridge between two cysteine residues holds the chain in a folded loop that influences its shape and its behavior in solution. Loss of the bridge through reduction or oxidation shifts chromatographic retention and is tracked during stability work.
It is a defined 28-residue sequence derived from a larger precursor, whereas many other thymic preparations are mixtures of several polypeptides. Its acetylated amino terminus and single disulfide bridge distinguish it chemically from unrelated thymic extracts.
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.