Everything below concerns 胸腺素α1. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-03-28. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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 |
|---|---|---|
| Appearance | White to off-white lyophilized powder | Visual description varies by batch |
| Solubility | Freely soluble in water | Aqueous buffers are commonly used |
| Typical storage temperature | -20 °C or below for powder | Reconstituted liquid kept at 2-8 °C short term |
| Purity method | Reversed-phase HPLC | Value derived from peak area integration |
| Identity method | Mass spectrometry | Confirms mass and sequence integrity |
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.
Thymosin alpha 1 is approved as a medicine in several countries, including Italy and China, for indications such as chronic hepatitis B and as an immune adjuvant. It is not approved by the United States Food and Drug Administration as a therapeutic product. In research settings the peptide appears in studies of sepsis, vaccine response, and oncology support, often with mixed or inconclusive results. The evidence base is uneven, and reviews note that many trials were small. Regulatory status therefore differs widely between jurisdictions.
Thymosin beta-4 is a separate 43-residue peptide that binds actin and participates in cell migration; it shares no sequence similarity with thymosin alpha-1 despite the common family name. Other preparative materials, such as thymosin fraction 5 and thymopoietin, contain distinct mixtures or peptides. The shared thymosin label reflects the tissue of origin used in early purification, not a common structural core. Treating these molecules as interchangeable is a frequent source of confusion in laboratory reports and in popular summaries alike.
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.
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.
==== Non-volatile residue ==== Another type of contamination in UPW is dissolved inorganic material, primarily silica. Any dissolved inorganic material has the potential to remain on the wafer as the UPW dries. Nonvolatile material can be detected by using nebulizer to create small droplets liquid suspended in a stream of gas. These droplets are dried an aerosol of non-volatile residue particles that can be counted by light scattering techniques.
The contaminated vegetable proteins were imported from China in 2006 and early 2007 and used as pet food ingredients. The process of identifying and accounting for the source of the contamination and for how the contaminant causes sickness was ongoing. The first recalls were announced by Menu Foods late on Friday, 16 March 2007 for cat and dog food products in the United States. By 30 March the United States began to ban imports of wheat gluten from China. The Chinese government responded on 4 April by categorically denying any connection to the North American food poisonings refusing to allow inspection of facilities suspected of producing contaminated products. However, on 6 April 2007, the Chinese government told the Associated Press they would investigate the source of the wheat gluten and by 23 April China gave permission to FDA investigators to enter the country. On 25 April Chinese authorities began to shut down and destroy the implicated factories and detain their managers. The following day, China's Foreign Ministry said it had banned the use of melamine in food products, admitting that products containing melamine had cleared customs while continuing to dispute the role of melamine in causing pet deaths. China also vowed to cooperate with U.S. investigators to find the "real cause" of pet deaths. The United States Senate held an oversight hearing on the matter by 12 April. The economic impact on the pet food market has been extensive, with Menu Foods losing roughly US$30 million alone from the recall.
Herophilos (335–280 BC) described the functions of the optic nerve in sight and the oculomotor nerve in eye movement. Analysis of the nerves in the cranium enabled him to differentiate between blood vessels and nerves (Ancient Greek: νεῦρον (neûron) "string, plant fiber, nerve"). Modern research has not confirmed William Cullen's 1785 hypothesis associating mental states with physical nerves, although popular or lay medicine may still invoke "nerves" in diagnosing or blaming any sort of psychological worry or hesitancy, as in the common traditional phrases "my poor nerves", "high-strung", and "nervous breakdown".
=== Controlled release of therapeutics === The ability of aptamers to reversibly bind molecules such as proteins has generated increasing interest in using them to facilitate controlled release of therapeutic biomolecules, such as growth factors. This can be accomplished by tuning the binding strength to passively release the growth factors, along with active release via mechanisms such as hybridization of the aptamer with complementary oligonucleotides or unfolding of the aptamer due to cellular traction forces.
== Arrest and conviction == Archerd was arrested on July 27, 1967, in Los Angeles for a threefold murder. He was convicted of killing the following: Zella Archerd, his fourth wife (July 25, 1956, two months after their wedding); Burney Archerd, his nephew (September 2, 1961, in Long Beach); and Mary Brinker Post, his seventh wife (November 3, 1966). Others suspected to be victims of Archerd are: William Jones Jr. (October 12, 1947, in Fontana), Juanita Plum Archerd, his fifth wife (March 13, 1958, in Las Vegas); and Frank Stewart (March 17, 1960). All exhibited symptoms of hypoglycemia. Archerd was sentenced to death on March 6, 1968, for three of the murder cases. The medical personnel, law enforcement, and prosecution team were unaware of the availability of an accurate and sensitive assay for blood insulin levels developed years earlier by Rosalyn Yalow in collaboration with Solomon Berson working at the Bronx Veterans Administration Hospital. Instead, they presented some unproven laboratory evidence that, in retrospect, should not have been accepted in court. In December 1970, the death sentence was upheld by the California Supreme Court. In 1972, the sentence was instead changed to life imprisonment after a ruling by the United States Supreme Court. Archerd died of pneumonia in 1977 at the age of 65.
Sources: en.wikipedia.org
The four substrates of this enzyme are pyrrole-2-carboxylic acid, reduced nicotinamide adenine dinucleotide (NADH), oxygen, and a proton. Its products are 5-hydroxypyrrole-2-carboxylic acid, oxidised NAD+, and water. It is a flavoprotein that uses flavin adenine dinucleotide as a cofactor.
In 1954, Mogens Schou of Denmark confirmed lithium's efficacy in a randomzied double-blind placebo-controlled study with his colleagues. Schou and Paul Baastrup organized other studies over the following years and decades and published a variety of research papers about lithium. At the time, lithium was a major advance. Before the advent of lithium, barbiturates were the standard treatment for mania. However, lithium was met with great resistance by British psychiatry. To Aubrey Lewis and Michael Shepherd, from the Institute of Psychiatry at Maudsley Hospital, lithium was ‘dangerous nonsense’. Michael Shepherd and Barry Blackwell called lithium a 'therapeutic myth.' The Maudsley psychiatrists had a history of debunking ineffective medical treatments. They claimed that Schou was biased because his brother, who experienced recurrent depressions since childhood, had a dramatic response to lithium. Schou felt that it had cured him. Largely through the research and other efforts of Mogens Schou and Paul Baastrup in Europe, and Samuel Gershon and Baron Shopsin in the U.S., resistance to lithium was slowly overcome. The American Psychiatric Association (APA) established a lithium task force chaired by Irvin M. Cohen, with members William Bunney, Jonathan Cole, Ronald R. Fieve, Samuel Gershon, Robert Prien, and Joseph Tupin. The recommendation of the lithium task force was to approve lithium. The application of lithium in manic illness was approved by the Food and Drug Administration in 1970, becoming the 50th nation to do so.
== History == Sarepta started in Corvallis, Oregon on January 1, 1980 and was originally named Antivirals Inc. After occupying several research laboratory spaces in Corvallis, the company opened a production laboratory in Corvallis in February 2002 and was renamed AVI BioPharma Inc. The company made headlines in 2003 when it announced work on treatments for severe acute respiratory syndrome (SARS) and the West Nile virus. In July 2009, the company announced they would move their headquarters from Portland, Oregon, north to Bothell, Washington, near Seattle. At that time, the company led by president and CEO Leslie Hudson had 83 employees and quarterly revenues of $3.2 million. AVI had yet to turn a profit and had not yet developed any commercial products as of July 2009. The company lost $19.7 million in the second quarter of 2009, and then won an $11.5 million contract with the U.S. Department of Defense's Defense Threat Reduction Agency in October 2009. By this time, the company had completed its headquarters move to Bothell. In 2012, the company moved a second time, to Cambridge, Massachusetts. At the time, CEO Chris Garabedian indicated the move was motivated by the need to recruit expertise in rare diseases. The Corvallis laboratory facility was closed in 2016. In June 2017, Sarepta Therapeutics appointed former Allergan executive Doug Ingram as its new CEO to replace Edward Kaye who had announced plans to step down earlier that year.
=== Deep brain stimulation === One treatment methodology that is very promising for the treatment of camptocormia is deep brain stimulation. Previously, deep brain stimulation and bilateral stimulation of the subthalamic nucleus and/or globus pallidus internus have been used to treat patients with Parkinson's disease. Studies have shown that similar treatments could be used on patients with severe camptocormia. By using the Burke-Fahn-Marsden Dystonia Rating Scale before and after treatment, it was found that patients experienced significant functional improvement in the ability to walk.
Sources: en.wikipedia.org
== Mentions in culture == In the 2009 film inspired by Edgar Allan Poe's "The Tell-Tale Heart", Tell-Tale, Eastlack is mentioned and referred to as Harry Erlich. The mention occurs in a scene where characters are in a museum, and a skeleton is referred to. The scene provides some genuine facts, such as how Eastlack's skeleton does not require any wiring or glue to be held together in the museum because the fused bones hold it all in one piece.
== Plasma vs. serum in medical diagnostics == Plasma and serum are both derived from full blood, but serum is obtained by removing blood cells, fibrin clots, and other coagulation factors while plasma is obtained by only removing blood cells. Blood plasma and blood serum are often used in blood tests. Tests can be done on plasma, serum or both. In addition, some tests have to be done with whole blood, such as the determination of the amount of blood cells in blood via flow cytometry.
For most of the Lower Paleolithic, human societies were possibly more hierarchical than their Middle and Upper Paleolithic descendants, and probably were not grouped into bands, though during the end of the Lower Paleolithic, the latest populations of the hominin Homo erectus may have begun living in small-scale (possibly egalitarian) bands similar to both Middle and Upper Paleolithic societies and modern hunter-gatherers. Middle Paleolithic societies, unlike Lower Paleolithic and early Neolithic ones, consisted of bands that ranged from 20 to 30 or 25–100 members and were usually nomadic. These bands were formed by several families. Bands sometimes joined into larger "macrobands" for activities such as acquiring mates and celebrations or where resources were abundant. By the end of the Paleolithic era (c. 10,000 BP), people began to settle down into permanent locations, and began to rely on agriculture for sustenance in many locations. Much evidence exists that humans took part in long-distance trade between bands for rare commodities (such as ochre, which was often used for religious purposes such as ritual) and raw materials, as early as 120,000 years ago in Middle Paleolithic. Inter-band trade may have appeared during the Middle Paleolithic because trade between bands would have helped ensure their survival by allowing them to exchange resources and commodities such as raw materials during times of relative scarcity (i.e. famine, drought). Like in modern hunter-gatherer societies, individuals in Paleolithic societies may have been subordinate to the band as a whole.
Nvidia revealed the GeForce GTX 1080, the world's first graphics card with DisplayPort 1.4 support on 6 May 2016. AMD followed with the Radeon RX 480 to support DisplayPort 1.3/1.4 on 29 June 2016. The Radeon RX 400 series will support DisplayPort 1.3 HBR and HDR10, dropping the DVI connector(s) in the reference board design. In February 2017, VESA and Qualcomm announced that DisplayPort Alt Mode video transport will be integrated into the Snapdragon 835 mobile chipset, which powers smartphones, VR/AR head-mounted displays, IP cameras, tablets and mobile PCs.
Viral vectors are genetically engineered viruses carrying modified viral DNA or RNA that has been rendered noninfectious, but still contain viral promoters and the transgene, thus allowing for translation of the transgene through a viral promoter. However, because viral vectors frequently lack infectious sequences, they require helper viruses or packaging lines for large-scale transfection. Viral vectors are often designed to permanently incorporate the insert into the host genome, and thus leave distinct genetic markers in the host genome after incorporating the transgene. For example, retroviruses leaves a characteristic retroviral integration pattern after insertion that is detectable and indicates that the viral vector has incorporated into the host genome.
Sources: en.wikipedia.org
Cold storage slows the chemical degradation reactions that occur in solution. Lyophilized powder is more stable than reconstituted liquid and tolerates longer storage periods. Repeated temperature cycling should still be avoided because it can drive aggregation and loss of material.
Mass spectrometry is the standard confirmation of molecular mass and acetylation state. Chromatography establishes purity but does not identify the molecule on its own. The two techniques are normally applied together during verification.
No, because the reported value reflects the detection method and wavelength used, which vary between laboratories. A number stated without method details cannot be compared directly with another supplier's figure. Requesting the chromatogram and the method conditions is a common way to interpret it.
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。