This is a working overview of 胸腺素α1, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-01-21. Anything still debated is marked as such rather than presented as settled.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
Thymosin alpha-1 is a 28-residue peptide first isolated from thymus tissue in the 1970s. It corresponds to the N-terminal portion of thymosin beta-4, from which it is cleaved in vivo. The peptide carries an acetyl group at its N-terminus, a modification that affects its charge and stability. Synthetic material produced by solid-phase peptide synthesis is chemically identical to the natural fragment and is the form used in research and clinical studies.
Thymosin alpha-1 is a short peptide of 28 amino acid residues first described in the 1970s as a component of thymic extracts. Its N-terminal residue carries an acetyl group, and the sequence is highly conserved across mammalian species. The peptide is not encoded as a standalone gene product; it is released by proteolytic cleavage from the N-terminus of prothymosin alpha, a larger acidic nuclear protein. That precursor relationship places it within a broader family of thymic and immune-associated peptides that have been studied for decades.
The activity of this peptide is generally described as immunomodulatory rather than directly antimicrobial. Experimental work links it to signaling through certain Toll-like receptors on dendritic cells and to downstream maturation of antigen-presenting cells. Reported effects include expansion of T cell subsets, shifts in cytokine profiles, and increased natural killer cell activity. These observations come largely from cell culture and animal models, and the precise receptor-level events in humans remain incompletely characterized.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Peptide | 28 amino acid residues |
| Molecular weight | Approximately 3108 Da | Depends on acetylation state |
| N-terminal modification | Acetylated | Affects charge and stability |
| Natural source | Fragment of thymosin beta-4 | Cleaved in vivo |
| Sequence length | 28 residues | Synthetic form matches natural |
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 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.
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.
Identity and purity are assessed with a small set of standard peptide methods. Reversed-phase high-performance liquid chromatography separates the main peak from truncated or oxidized species, and its area percentage is the usual purity measure. Mass spectrometry confirms the observed molecular mass against the expected value, while amino acid analysis or peptide mapping checks composition and sequence. Specifications for research-grade material are often stated as 95 percent or higher, though the exact limit depends on the supplier and the intended use.
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。
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.
The peptide occurs naturally in thymic tissue and has been detected in serum and other biological fluids. Reported concentrations are low, and reliable measurement generally requires immunoassay or mass spectrometry with an enrichment step. It is released from a larger precursor, prothymosin alpha, by proteolytic cleavage, although the enzymes involved are not fully characterized. Whether circulating levels reflect thymic output specifically remains an open question.
She has given a great deal of thought to how women are taught to act as they grow up and how that may impact their career decisions. In an interview in 2004, Osborn said, "In deciding whether to accept new challenges a remark by Diane Britten some years ago in The Times has proved very helpful: "When asked to do something women tend to say `Why me?' Men say `Why not me?' I have learned to say `Why not me?''' Summing up her advice to those in charge of sciences in universities and industry, she said in 2012, "Above all one has to get the argument across that it is wasteful, expensive and unfair to educate and train large numbers of woman scientists and then not use their talents in the job market or provide equal access to the top jobs."
== Parental care == Blow flies like C. vomitoria lay their eggs at carrion sites, which are scarce in most places so these corpses end up with many eggs of various species. As a result, high larval density arises. In fact, when there are many other individuals around the site, pregnant females increase oviposition rate (which increases number of offspring), likely triggered by contact and chemical stimulation. However, the large number of larvae ends up being beneficial for each individual. The larvae feed by secretion of enzymes that break down tissues of the corpse, so by aggregating in large numbers these secretions are more effective, leading to easier feeding. Additionally, the large aggregation helps generate heat and keep the larvae warm, as the flies generally prefer warmer temperature. One complication with the high number of individuals is that competition is still a factor, as larvae on the periphery may be left out of the feeding, and by the end of the developmental cycle they emerge undernourished and undersized.
== Signs and symptoms == Severe weakness of the proximal muscles (shoulders, upper arms, thighs) on both sides of the body, very high blood levels of the enzyme creatine kinase (CK) being released by broken down skeletal muscle, and persistent symptoms and CK elevation despite stopping the offending statin medication are the hallmarks of SAAM. Other forms of statin associated muscle damage (myopathy) usually resolve after stopping the involved statin. Mild joint pain and rash may be present. In people affected by SAAM, the median duration of statin therapy was 38 months before the onset of muscular symptoms. SAAM may affect people after long-term statin use even if they had no previous muscular side effects. A differentiating feature between this and more benign statin side effects is SAAM typically has a late onset. While muscle pain (myalgia) is seen in 9-20% of patients treated with statins, it typically occurs in the first month of treatment. SAAM has a later onset, occurring years after uncomplicated statin use. In some cases even after statins have been discontinued for several years.
== Epidemiology == A 1994 community-based study indicated that two out of every 100,000 people with a sCSF, while a 2004 emergency room-based study indicated five per 100,000. sCSF leaks generally affect the young and middle aged; the average age for onset is 42.3 years, but onset can range from ages 22 to 61. In an 11-year study, women were found to be twice as likely to be affected as men. Studies have shown that sCSF leaks runs in families. It is suspected that genetic similarity in families includes weakness in the dura mater which leads to a sCSFL. Large scale population-based studies have not yet been conducted. While a majority of sCSF leaks continue to be undiagnosed or misdiagnosed, an actual increase in occurrence is unlikely.
Sources: en.wikipedia.org
We feel that the Arabs and Jews are cousins in race, suffering similar oppression at the hands of powers stronger than themselves, and by a happy coincidence have been able to take the first step toward the attainment of their national ideals together. We Arabs, especially the educated among us, look with deepest sympathy on the Zionist movement ... We will do our best, in so far as we are concerned, to help them through; we will wish the Jews a most hearty welcome home.When the letter was tabled at the Shaw Commission in 1929, Rustam Haidar spoke to Faisal in Baghdad and cabled that Faisal had "no recollection that he wrote anything of the sort". In January 1930, Haidar wrote to a newspaper in Baghdad that Faisal: "finds it exceedingly strange that such a matter is attributed to him as he at no time would consider allowing any foreign nation to share in an Arab country". Awni Abd al-Hadi, Faisal's secretary, wrote in his memoirs that he was not aware that a meeting between Frankfurter and Faisal took place and that: "I believe that this letter, assuming that it is authentic, was written by Lawrence, and that Lawrence signed it in English on behalf of Faisal. I believe this letter is part of the false claims made by Chaim Weizmann and Lawrence to lead astray public opinion." According to Allawi, the most likely explanation for the Frankfurter letter is that a meeting took place, a letter was drafted in English by Lawrence, but that its "contents were not entirely made clear to Faisal.
Sulfur–sulfur bonds are a structural component used to stiffen rubber, similar to the disulfide bridges that rigidify proteins (see biological below). In the most common type of industrial "curing" or hardening and strengthening of natural rubber, elemental sulfur is heated with the rubber to the point that chemical reactions form disulfide bridges between isoprene units of the polymer. This process, patented in 1843, made rubber a major industrial product, especially in automobile tires. Because of the heat and sulfur, the process was named vulcanization, after the Roman god of the forge and volcanism.
Trypsinogen () is the precursor form (or zymogen) of trypsin, a digestive enzyme. It is produced by the pancreas and found in pancreatic juice, along with amylase, lipase, and chymotrypsinogen. It is cleaved to its active form, trypsin, by enteropeptidase, which is found in the intestinal mucosa. Once activated, the trypsin can cleave more trypsinogen into trypsin, a process called autoactivation. Trypsin cleaves the peptide bond on the carboxyl side of basic amino acids such as arginine and lysine.
The sulcular epithelium is a thin, non-keratinized epithelial lining that forms the smooth inner wall of the gingival sulcus, extending from the gingival margin coronally to the dentogingival junction apically. The gingival sulcus normally measures 0.5–3 mm in healthy individuals; an increase beyond this range may indicate pseudopocket formation or periodontal disease. The sulcular epithelium primarily acts as the protective barrier against foreign substances while also playing a crucial immunological role due to its semi-permeable nature. Structural and functional changes in the sulcular epithelium are observed during the onset and progression of periodontal disease. In dental anatomy, the sulcular epithelium is that epithelium which lines the gingival sulcus. It is apically bounded by the junctional epithelium and meets the epithelium of the oral cavity at the height of the free gingival margin. The sulcular epithelium is nonkeratinized.
The Cherokee Nation also has the right to appoint a delegate to the U.S. House of Representatives, per the 1835 Treaty of New Echota. In 2019, Kimberly Teehee was appointed the first ever delegate to the U.S. House of Representatives from the Cherokee Nation, in accordance with the 1835 treaty, though Congress has not yet seated her.
Sources: en.wikipedia.org
Not only did the people of ancient Mexico use the same methods of production as the Phoenicians, they also valued murex-dyed cloth above all others, as it appeared in codices as the attire of nobility. "Nuttall noted that the Mexican murex-dyed cloth bore a "disagreeable ... strong fishy smell, which appears to be as lasting as the colour itself." Likewise, the ancient Egyptian Papyrus of Anastasi laments: "The hands of the dyer reek like rotting fish". So pervasive was this stench that the Talmud specifically granted women the right to divorce any husband who became a dyer after marriage. In 2021, archaeologists found surviving wool fibers dyed with royal purple in the Timna Valley in Israel. The find, which was dated to c. 1000 BC, constituted the first direct evidence of fabric dyed with the pigment from antiquity.
=== Terrestrial abundance === Perchlorate is created by lightning discharges in the presence of chloride. Perchlorate has been detected in rain and snow samples from Florida and Lubbock, Texas. Naturally occurring perchlorate at its most abundant can be found commingled with deposits of sodium nitrate in the Atacama Desert of northern Chile. These deposits have been heavily mined as sources for nitrate-based fertilizers. Chilean nitrate is in fact estimated to be the source of around 81,000 tonnes (89,000 tons) of perchlorate imported to the U.S. (1909–1997). Results from surveys of ground water, ice, and relatively unperturbed deserts have been used to estimate a 100,000 to 3,000,000 tonnes (110,000 to 3,310,000 tons) "global inventory" of natural perchlorate presently on Earth.
==== Initial vice presidential conflict ==== In conflict with Vice President Verónica Abad Rojas from the very first days of his mandate, he distanced her by appointing her "peace collaborator" between Israel and the Palestinians, a mission she was to carry out from the Ecuadorian embassy in Tel Aviv. At the same time, he announced the reorganisation of the vice presidency in order to reduce its powers. Abad Rojas accused him of sending her "to die in the war". Indeed, Noboa sent Abad Rojas to Israel just weeks after diplomats were being evacuated from Israel due to the October 7 attacks, and with decreased security while she remained outside of Ecuador.
===== Clinical Laboratory Building ===== UPMC's nine-story Clinical Laboratory Building (CLB) opened in 2013 and cost $39 million. The CLB is located in the Oakland neighborhood and is situated between Magee-Womens Hospital and UPMC Presbyterian Hospital. Much of UPMC's laboratory testing is performed within the CLB. An extensive pneumatic tube system connects the CLB with UPMC hospitals that are in the Oakland neighborhood (Presbyterian, Magee-Womens, Montefiore) to facilitate the transport of specimens from the hospitals to the laboratories.
Sources: en.wikipedia.org
It corresponds to the first 28 amino acids of thymosin beta-4, a larger protein found in many tissues. The fragment is acetylated at its N-terminus and is produced synthetically for research and pharmaceutical use. Synthetic and natural forms share the same sequence.
It is usually described as an immunomodulatory peptide rather than a classical hormone. It does not travel to a single distant organ in the manner of an endocrine hormone. Classification varies across sources, and some texts group it with thymic peptides generally.
The broad outline involves immune cell activation, but the specific molecular steps remain under investigation. Different studies report effects on dendritic cells, T cells, and natural killer cells. No single receptor has been confirmed as the sole mediator.
It is usually classified as an immunomodulatory peptide rather than a classical hormone. It derives from the larger protein prothymosin alpha and acts mainly on immune cells. The thymosin label covers a group of distinct peptides, so the naming can be misleading.