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.
This page was last updated on 2025-12-04 and is reviewed periodically as new material appears.
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。
Quantifying thymosin alpha-1 in a sample usually relies on reverse-phase high-performance liquid chromatography. The peptide lacks strong chromophores, so detection often occurs at 214 nm, where the peptide backbone absorbs. Mass spectrometry provides confirmatory identification and can detect sequence variants or truncations. Immunoassays have been used in biological matrices, but they may cross-react with related fragments. For purity assessment, chromatographic peak area gives the main component percentage, while mass accuracy verifies molecular identity.
The lyophilized peptide is generally stable for extended periods when kept cold and dry. Once dissolved, aqueous solutions are less stable; hydrolysis, oxidation, and aggregation can degrade the material. Storage at -20 °C or lower slows these processes. Repeated freeze-thaw cycles are best avoided because they can promote aggregation. The exact shelf life depends on formulation, pH, and concentration, so stability studies are typically performed for each specific product.
| Property | Value | Notes |
|---|---|---|
| 化学分类 | 线性肽 | 由28个氨基酸组成 |
| 分子量 | 约3108 Da | 合成版本一致 |
| 外观 | 白色至类白色粉末 | 冻干品 |
| 溶解度 | 易溶于水 | 微溶于有机溶剂 |
| 储存温度 | -20°C（冻干） | 溶解后2-8°C |
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.
Like most short peptides, thymosin alpha-1 is susceptible to hydrolysis under strongly acidic or basic conditions and to oxidation when exposed to air over long periods. The acetylated amino terminus blocks one common degradation route, which contributes to the molecule's relative robustness in solution. Lyophilized material generally retains potency for extended periods when kept cold and dry. Once reconstituted, aqueous solutions are less stable and are typically used within a defined window rather than held indefinitely at ambient temperature.
Routine handling calls for storage of the lyophilized powder at refrigerated temperatures, away from light, in a sealed container. Working solutions are often prepared in sterile water or buffer and kept cold between uses. Repeated freeze-thaw cycles are generally avoided because they can promote aggregation and loss of material. Laboratories usually record lot number, reconstitution date, and storage conditions so that any change in behavior can be traced to a specific preparation.
== Adverse effects == The major side effects of tegafur are similar to fluorouracil and include myelosuppression, central neurotoxicity and gastrointestinal toxicity (especially diarrhoea). Gastrointestinal toxicity is the dose-limiting side effect of tegafur. Central neurotoxicity is more common with tegafur than with fluorouracil.
===== Southern Land Bridge project ===== Paetongtarn Shinawatra has adopted the 1-trillion-baht Southern Land Bridge project as a cornerstone of her administration's economic policy, positioning herself as its chief advocate and lead promoter on the international stage. Her role is multifaceted, encompassing policy direction, investment promotion, and stakeholder management for one of Thailand's most ambitious and controversial mega-projects. The project aims to construct a 90-kilometer logistics corridor, including deep-sea ports in Ranong (Andaman Sea) and Chumphon (Gulf of Thailand), linked by a motorway and dual-track railway. This would create a strategic alternative to the congested Strait of Malacca for maritime transport. She has argued that it will reduce shipping times by several days, lower costs by up to 15%, create an estimated 280,000 jobs, and boost GDP growth. During numerous overseas roadshows and at major domestic events like the "Ignite Thailand" forum in March 2025, she has presented the project as a key opportunity for investment. She has actively courted interest from global players, particularly during her official visit to China in February 2025, and has highlighted investment interest from firms in China, the Middle East (notably Dubai Port World), and financial institutions like the Asian Infrastructure Investment Bank (AIIB).
== Environmental benefits == Insects require significantly less feed, can be used in feed, and release fewer CO2 emissions than conventional animal food sources. They can be used to address the issue of depleted agricultural lands as they do not need much space to be reared as compared to livestock. Insects may be a sustainable commercial farming option to support populations struggling with food security due to their nutrition and farming capacities, taking less room to cultivate than other protein sources. Additionally, since insects can eat food waste, and they require less feed, they are a good option to address food waste. However, insect consumption remains less sustainable overall than plant-based food, and insects are often used as feed for aquaculture and livestock rather than for direct human consumption.
Sources: en.wikipedia.org
==== Measles prevention ==== "Vitamin A deficiency (VAD) is a major public health problem in low- and middle-income countries, affecting 190 million children under five years of age and leading to many adverse health consequences, including death." Vitamin A deficiency is rare in the United States. A meta-analysis of clinical trials conducted in countries where VAD is prevalent concluded that when children were supplemented with vitamin A, there was a 50% reduction in incidence of contracting measles. Vitamin A supplementation is not thought to reduce the risk of death from measles. Young children given high doses of vitamin A from supplements or cod liver oil can accumulate to toxic levels and this can lead to hypervitaminosis A and liver damage. In the 2025 Southwest United States measles outbreak, centered in West Texas, some families continued to refuse vaccines and instead opted for giving vitamin A supplements or vitamins A- and D-containing cod liver oil to their children after Robert F. Kennedy Jr., promoted vitamin A as prevention and treatment. Multiple children hospitalized for measles at Covenant Children's Hospital in Lubbock also showed signs of liver damage, a symptom of vitamin A toxicity.
Napoleon defeated the Prussians at Jena-Auerstedt and the Russians at Friedland, bringing an uneasy peace to the continent by July 1807, and again leaving Britain as France's sole major enemy. Britain was unable to dispute French dominance on the continent but obtained hegemony over the seas after victories including Trafalgar. Russia used the interim peace to resolve wars with the Ottomans, Swedes, and Iranians. Hoping to isolate and weaken Britain economically through his Continental System, Napoleon launched an invasion of Portugal, the only remaining British ally in continental Europe. After occupying Lisbon in November 1807, and with the bulk of French troops present in Spain, Napoleon seized the opportunity to turn against his former ally, depose the reigning Spanish royal family, and declare his brother as Joseph I the King of Spain in 1808, to the disapproval of the Spanish populace. Spain joined Britain and Portugal, with the three powers engaging France in the Peninsular War. The diversion of French armies to the large new Anglo-Spanish front led to Austria reentering the conflict and forming the Fifth Coalition in April 1809, composed of Austria, Spain, and Britain. Austria won the Battle of Aspern-Essling but was defeated at Wagram, forcing the imposition of a harsh peace in October 1809. Britain, Spain, and Portugal remained at war with France. Concurrently Russia, unwilling to bear the economic consequences of reduced trade, violated the Continental System, prompting Napoleon to launch an invasion in June 1812.
=== Trophoblast differentiation === In addition, HAND1 is uniquely expressed in trophoblasts and is essential for early trophoblast giant cell differentiation. Trophoblast giant cells are necessary in order for placental development to proceed, participating in vital processes such as blastocyst implantation, remodeling of the maternal decidua, and secretion of hormones. The importance of this relationship is demonstrated in HAND1-null mutant mice, which display significant abnormalities in trophoblast development, such as a reduced ectoplacental cone, thin parietal yolk sac, and reduced density of trophoblast giant cells. These homozygous HAND1-null mutant embryos were arrested by E7.5 of gestation, though could be saved by contribution of wild-type cells to the trophoblast.
Sources: en.wikipedia.org
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。
天然胸腺素α1主要从胸腺组织提取，也可在脾脏和淋巴结中检出。目前研究和临床使用的多为化学合成版本，不再依赖动物组织。
胸腺素组分5是牛胸腺提取物的粗组分，包含多种肽。胸腺素α1是其中一种被纯化和表征的单一肽，具有明确的28个氨基酸序列。
Reverse-phase HPLC with ultraviolet detection at 214 nm is common. Mass spectrometry is used to confirm molecular identity and detect modifications. Immunoassays exist but may not distinguish the intact peptide from fragments.