Everything below concerns 免疫调节. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-01-03. Numbers and descriptions here follow the published literature rather than marketing material.
在信号层面，Tα1可能通过Toll样受体等模式识别受体发挥作用。部分实验显示，它能激活髓样分化因子88依赖的通路，进而促进核因子κB进入细胞核。这导致白细胞介素2、干扰素γ和白细胞介素12等细胞因子的转录增加。这些细胞因子偏向辅助性T细胞1型应答，有助于细胞免疫。然而，具体受体和结合位点尚未完全确定，不同实验模型的结果存在差异。
临床研究将Tα1用于慢性病毒感染、肿瘤辅助治疗和疫苗佐剂等场景。部分试验报告了免疫学指标改善，但临床终点获益在不同研究中并不一致。系统综述指出，研究间在人群、剂量和联合方案上差异较大，难以汇总结论。因此，Tα1的确切临床地位仍属开放问题，需要更多高质量随机对照试验来澄清。其机制研究也需从体外实验向体内模型推进。
Thymosin alpha-1 is a synthetic peptide of 28 amino acids, corresponding to the N-terminal fragment of prothymosin alpha. Its sequence begins with acetylation at the N-terminus, a modification that affects stability and receptor interaction. The peptide is acidic, with a calculated isoelectric point near 4.2, and carries no disulfide bonds, so its secondary structure is largely flexible in solution. Molecular mass is approximately 3108 daltons. The native form was first isolated from bovine thymus tissue, while pharmaceutical material is produced by solid-phase peptide synthesis.
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.
| Property | Value | Notes |
|---|---|---|
| 主要靶细胞 | T细胞、树突状细胞 | 也影响NK细胞 |
| 信号通路 | TLR/MyD88/NF-κB | 部分实验模型 |
| 细胞因子偏向 | Th1型 | 增加IL-2、IFN-γ |
| 给药途径 | 皮下注射 | 临床常用 |
| 半衰期 | 约2小时 | 血浆中较短 |
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.
The compound has been investigated as an adjunct in chronic viral hepatitis and as a vaccine adjuvant, with results that vary by study design and population. Regulators in some countries have approved a synthetic form for specific indications, while other agencies have not. Whether the peptide produces consistent clinical benefit across diverse patient groups is still an open question, and many trials have been small. Its status is therefore best described as investigational in many contexts and established only narrowly.
The name itself causes confusion, because several unrelated thymic peptides share the thymosin label. Thymosin beta-4, for example, is a different molecule with different functions. Naming conventions in the literature also mix descriptive research terms with assigned nonproprietary names, so a reader should confirm which entity a given paper addresses. Clarifying that point is usually the first step in interpreting any claim about this peptide.
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。
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。
McGregor starred in Moulin Rouge! (2001) as the young poet Christian, who falls in love with the terminally-ill courtesan Satine (Nicole Kidman), for which his performance was widely praised and garnered McGregor his first Golden Globe Award for Best Actor – Motion Picture Musical or Comedy nomination. He also appeared in Ridley Scott's war film Black Hawk Down (2001) as John Grimes. He starred alongside Renée Zellweger in Down with Love (2003). He also portrayed the younger Edward Bloom in Tim Burton's critically acclaimed film Big Fish (2003) alongside Albert Finney, Jessica Lange, Alison Lohman and Billy Crudup. In the same period, he also received critical acclaim for his portrayal of an amoral drifter mixed up with murder in the drama Young Adam (also 2003), which co-starred Tilda Swinton. McGregor voiced the robot Rodney Copperbottom in Robots and the lead character in Gary Chapman's Valiant (both 2005). Also around this time, McGregor played two roles – one a clone of the other – opposite Scarlett Johansson in Michael Bay's science fiction action thriller film The Island (2005). He also headlined Marc Forster's 2005 film Stay, a psychological thriller co-starring Naomi Watts and Ryan Gosling.
Woodworking When wood is used as a construction material, whether as a structural support in a building or in woodworking objects, it will absorb or expel moisture until it is in equilibrium with its surroundings. Equilibration (usually drying) causes unequal shrinkage in the wood, and can cause damage to the wood if equilibration occurs too rapidly. The equilibration must be controlled to prevent damage to the wood. Wood burning When wood is burned (firewood), it is best to dry it first. Damage from shrinkage is not a problem here, as it may be in the case of drying for woodworking purposes. Moisture affects the burning process, with unburnt hydrocarbons going up the chimney. If a 50% wet log is burnt at high temperature, with good heat extraction from the exhaust gas leading to a 100°C exhaust temperature, about 5% of the energy of the log is wasted through evaporating and heating the water vapour. With condensers, the efficiency can be further increased; but, for the normal stove, the key to burning wet wood is to burn it very hot, perhaps starting fire with dry wood.
In the 17th century Guillaume Amontons discovered a regular relationship between the pressure and temperature of a gas at constant volume. Some introductory physics textbooks still define the pressure-temperature relationship as Gay-Lussac's law. Gay-Lussac primarily investigated the relationship between volume and temperature and published it in 1802, but his work did cover some comparison between pressure and temperature. Given the relative technology available to both men, Amontons could only work with air as a gas, whereas Gay-Lussac was able to experiment with multiple types of common gases, such as oxygen, nitrogen, and hydrogen.
Sources: en.wikipedia.org
=== History of direct examination of biological tissue by mass spectrometry (MS) === Direct examination of biological tissue by mass spectrometry (MS) began in the 1970s, but at that time the next advance in technical conditions did not exist. The method did not provide any useful information on the chemical composition of the samples tested. The first breakthrough came with desorption ionisation methods (secondary ionization mass spectrometry - SIMS, matrix-assisted laser desorption ionization - MALDI) a release said. Using these methods, after appropriate sample preparation, chemical biological tissue imaging analysis may be achieved. From the end of the 1990s, it became apparent that mass spectrometry data in imaging studies showed a high degree of tissue specificity, that tissue histology could determine mass spectral information, and vice versa. In the case of the detected protein and peptide components, tissue-specific expression of the proteins is known commonly. Precise immunohistochemical methods are based on this phenomenon. The mass spectrometer detection, mainly from cell membranes and similar tissue, specifically, of complex lipids from similar tissue, however, yields surprising results. Since the distribution of proteins are in good agreement with the distribution patterns obtained by immunohistochemical methods, the distribution of the lipid components of the direct ionization mass spectrometric, previously were relative methods leading to the appearance of a new era in the study of biological specimens.
== Natural occurrence == NMT is naturally occurring in Acacia species like Acacia confusa (1.63%; Buchanan et al., 2007), Acacia obtusifolia (up to two-thirds of total alkaloid content), and Acacia simplicifolia (A. simplex; 1.44% in bark, 0.29% twigs; Pouet et al., 1976) and Desmanthus illinoensis (major component seasonally).
Significant 6d involvement is expected in the Nh–Au bond, although it is expected to be more unstable than the Tl–Au bond and entirely due to magnetic interactions. This raises the possibility of some transition metal character for nihonium. On the basis of the small energy gap between the 6d and 7s electrons, the higher oxidation states +3 and +5 have been suggested for nihonium. Some simple compounds with nihonium in the +3 oxidation state would be the trihydride (NhH3), trifluoride (NhF3), and trichloride (NhCl3). These molecules are predicted to be T-shaped and not trigonal planar as their boron analogues are: this is due to the influence of the 6d5/2 electrons on the bonding. The heavier nihonium tribromide (NhBr3) and triiodide (NhI3) are trigonal planar due to the increased steric repulsion between the peripheral atoms; accordingly, they do not show significant 6d involvement in their bonding, though the large 7s–7p energy gap means that they show reduced sp2 hybridisation compared to their boron analogues. The bonding in the lighter NhX3 molecules can be considered as that of a linear NhX+2 species (similar to HgF2 or AuF−2) with an additional Nh–X bond involving the 7p orbital of nihonium perpendicular to the other two ligands. These compounds are all expected to be highly unstable towards the loss of an X2 molecule and reduction to nihonium(I):
==== Drug and toxin-associated myopathies ==== Medication-related muscle disease is an important diagnostic consideration. Myopathy may occur with corticosteroids, amiodarone, cyclosporine, statins, colchicine, chloroquine or hydroxychloroquine, and chronic alcohol exposure just to name a few. Some of these agents can produce muscle biopsy findings that partially overlap with inflammatory myopathies. In individuals with human immunodeficiency virus infection, both HIV-associated myopathy and antiretroviral drug toxicity may contribute to diagnostic uncertainty.
Sources: en.wikipedia.org
它促进未成熟T细胞分化并增强成熟T细胞的增殖与细胞因子分泌。这些作用有助于放大抗原特异性免疫应答。
目前认为它可能通过Toll样受体等模式识别受体传递信号，但精确的受体身份和结合机制尚未完全阐明。
不同试验在患者选择、给药方案、联合治疗和终点定义上差异很大。这些异质性使得跨研究比较困难，结论难以统一。
It corresponds to a fragment of the larger protein prothymosin alpha, which is present in many tissues. The isolated 28-amino-acid peptide was originally obtained from thymus preparations, and the pharmaceutical product is synthesized rather than extracted. The term therefore describes both a natural fragment and a manufactured drug substance.