A practical reference on thymalfasin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-12-04 and is reviewed periodically as new material appears.
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。
胸腺素α1对免疫系统的影响涉及多种细胞类型。研究表明，它可促进未成熟T细胞向成熟T细胞分化，并增强T细胞对抗原刺激的增殖反应。树突状细胞在Tα1存在下表达更高水平的共刺激分子，从而更有效地呈递抗原。此外，自然杀伤细胞的活性也观察到上升。这些效应并非直接杀伤病原体，而是调节宿主免疫应答的强度与方向。
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。
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 |
|---|---|---|
| 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 |
Identity and purity are normally confirmed by reversed-phase high-performance liquid chromatography and mass spectrometry. The expected mass for the acetylated 28-residue peptide is close to 3108 daltons, and a mass shift indicates a modification or truncation. Peptide mapping after enzymatic digestion can resolve sequence-level questions. Counter-ion content, water content, and residual solvents are separate quality attributes that a certificate of analysis may or may not report. Aggregation is monitored by size-exclusion chromatography when relevant.
Thymosin alpha-1 is supplied as a lyophilized powder in most research settings. The solid dissolves readily in water and in common aqueous buffers, and it is typically reconstituted shortly before use. Solutions are clear and colourless at ordinary working concentrations. Because the peptide is hygroscopic, weighing and reconstitution are usually performed with minimal exposure to ambient air. Aliquots are prepared to avoid repeated freeze-thaw cycles, and working solutions are kept cold.
Long-term storage is generally at minus twenty degrees Celsius or colder, preferably desiccated and protected from light. Lyophilized material is more stable than reconstituted solution, which degrades faster at room temperature. Stability depends on pH, ionic strength, and the presence of oxidising agents. Published stability data for the peptide are limited, so storage claims in catalogues should be treated as general guidance rather than measured guarantees. Freeze-thaw cycles are kept to a minimum.
Laboratory work indicates that the peptide acts on cells of both the innate and adaptive immune systems. Reported effects include signalling through Toll-like receptors on dendritic cells, enhanced T-cell maturation, and increased natural killer cell activity. These actions are described largely from cell-culture and animal experiments, and the precise receptor-level events remain incompletely defined. Studies in humans have generally measured immune markers rather than a single defined molecular target. The resulting picture remains partly descriptive.
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.
=== Minimum requirement specification for Western Blot === In order to ensure that the results of Western blots are reproducible, it is important to report the various parameters mentioned above, including specimen preparation, the concentration of protein used for loading, the percentage of gel and running condition, various transfer methods, attempting to block conditions, the concentration of antibodies, and identification and quantitative determination methods. Many of the articles that have been published don't cover all of these variables. Hence, it is crucial to describe different experimental circumstances or parameters in order to increase the repeatability and precision of WB. To increase WB repeatability, a minimum reporting criteria is thus required.
Most dietary carbohydrates contain glucose, either as their only building block (as in the polysaccharides starch and glycogen), or together with another monosaccharide (as in the hetero-polysaccharides sucrose and lactose). Unbound glucose is one of the main ingredients of honey. Glucose is extremely abundant and has been isolated from a variety of natural sources across the world, including male cones of the coniferous tree Wollemia nobilis in Rome, the roots of Ilex asprella plants in China, and straws from rice in California.
== Mechanism of plasminogen activation == Full length plasminogen comprises seven domains. In addition to a C-terminal chymotrypsin-like serine protease domain, plasminogen contains an N-terminal Pan Apple domain (PAp) together with five Kringle domains (KR1-5). The Pan-Apple domain contains important determinants for maintaining plasminogen in the closed form, and the kringle domains are responsible for binding to lysine residues present in receptors and substrates. The X-ray crystal structure of closed plasminogen reveals that the PAp and SP domains maintain the closed conformation through interactions made throughout the kringle array . Chloride ions further bridge the PAp / KR4 and SP / KR2 interfaces, explaining the physiological role of serum chloride in stabilizing the closed conformer. The structural studies also reveal that differences in glycosylation alter the position of KR3. These data help explain the functional differences between the type I and type II plasminogen glycoforms. In closed plasminogen, access to the activation bond (R561/V562) targeted for cleavage by tPA and uPA is blocked through the position of the KR3/KR4 linker sequence and the O-linked sugar on T346. The position of KR3 may also hinder access to the activation loop. The Inter-domain interactions also block all kringle ligand-binding sites apart from that of KR-1, suggesting that the latter domain governs pro-enzyme recruitment to targets.
== Signals and noise == One of the most important components of analytical chemistry is maximizing the desired signal while minimizing the associated noise. The analytical figure of merit is known as the signal-to-noise ratio (S/N or SNR). Noise can arise from environmental factors as well as from fundamental physical processes.
The West Coast exhibition site opened on 22 June 2006 at the Tropicana Resort and Casino Las Vegas. As of June 2009, BODIES... The Exhibition is showing at the Ambassador Theatre in Dublin, Ireland. The exhibition was in Istanbul, Turkey, until the end of March 2011. Plastination galleries are offered in several college medical schools, including the University of Michigan (which Michigan Daily reported possessed the United States' largest such lab in 2007), Vienna University, and the JSS Medical Collegem Gunther von Hagens maintains a permanent exhibition of plastinates and plastination at the Plastinarium in Guben, Germany.
Sources: en.wikipedia.org
The biotechnical company Defymed, based in France, is developing an implantable bio-artificial device called MailPan which features a bio-compatible membrane with selective permeability to encapsulate different cell types, including pancreatic beta cells. The implantation of the device does not require conjunctive immuno-suppressive therapy because the membrane prevents antibodies of the patient from entering the device and damaging the encapsulated cells. After being surgically implanted, the membrane sheet will be viable for years. The cells that the device holds can be produced from stem cells rather than human donors, and may also be replaced over time using input and output connections without surgery. Defymed is partially funded by JDRF, formerly known as the Juvenile Diabetes Research Foundation, but is now defined as an organization for all ages and all stages of type 1 diabetes. In November 2018, it was announced that Defymed would partner with the Israel-based Kadimastem, a bio-pharmaceutical company developing stem-cell based regenerative therapies, to receive a two-year grant worth approximately $1.47 million for the development of a bio-artificial pancreas that would treat type 1 diabetes. Kadimastem's stem cell technology uses differentiation of human embryonic stem cells to obtain pancreatic endocrine cells. These include insulin-producing beta cells, as well as alpha cells, which produce glucagon. Both cells arrange in islet-like clusters, mimicking the structure of the pancreas.
== History == EGF was the second growth factor to be identified. Initially, human EGF was known as urogastrone. Stanley Cohen discovered EGF while working with Rita Levi-Montalcini at the Washington University in St. Louis during experiments researching nerve growth factor. For these discoveries Levi-Montalcini and Cohen were awarded the 1986 Nobel Prize in Physiology or Medicine.
Manufacture and sale of sildenafil citrate drugs known as "generic Viagra" is common in India, where Pfizer's patent claim does not apply. Brand names include Kamagra (Ajanta Pharma), Silagra (Cipla), Edegra (Sun Pharmaceutical), Penegra (Zydus Cadila), Manly (Cooper Pharma) and Zenegra (Alkem Laboratories).
== Formation and ecological succession == Cold seeps occur over fissures on the seafloor caused by tectonic activity. Oil and methane "seep" out of those fissures, get diffused by sediment, and emerge over an area several hundred meters wide. Methane (CH4) is the main component of natural gas. But in addition to being an important energy source for humans, methane also forms the basis of a cold seep ecosystem. Cold seep biota below 200 m (660 ft) typically exhibit much greater systematic specialization and reliance on chemoautotrophy than those from shelf depths. Deep-sea seeps sediments are highly heterogeneous. They sustain different geochemical and microbial processes that are reflected in a complex mosaic of habitats inhabited by a mixture of specialist (heterotrophic and symbiont-associated) and background fauna.
== Composition and nutrition == Garlic powder is 73% carbohydrates (including 9% dietary fiber), 17% protein, 1% fat, and 6% water (table). In a reference amount of 100 g (3.5 oz), garlic powder supplies 331 calories, and is a moderate-to-rich source (higher than 10% of the Daily Value, DV) of several B vitamins and dietary minerals (table).
Sources: en.wikipedia.org
=== EC 2.8.3: CoA-transferases === EC 2.8.3.1: propionate CoA-transferase EC 2.8.3.2: oxalate CoA-transferase EC 2.8.3.3: malonate CoA-transferase EC 2.8.3.4: deleted EC 2.8.3.5: 3-oxoacid CoA-transferase EC 2.8.3.6: 3-oxoadipate CoA-transferase EC 2.8.3.7: The activity is due to two enzymes, EC 2.8.3.22, succinyl-CoA—L-malate CoA-transferase and EC 2.8.3.20, succinyl-CoA—Dcitramalate CoA-transferase EC 2.8.3.8: acetate CoA-transferase EC 2.8.3.9: butyrate—acetoacetate CoA-transferase EC 2.8.3.10: citrate CoA-transferase EC 2.8.3.11: citramalate CoA-transferase EC 2.8.3.12: glutaconate CoA-transferase EC 2.8.3.13: succinate—hydroxymethylglutarate CoA-transferase EC 2.8.3.14: 5-hydroxypentanoate CoA-transferase EC 2.8.3.15: succinyl-CoA:(R)-benzylsuccinate CoA-transferase EC 2.8.3.16: formyl-CoA transferase EC 2.8.3.17: cinnamoyl-CoA:phenyllactate CoA-transferase EC 2.8.3.18: succinyl-CoA:acetate CoA-transferase EC 2.8.3.19: CoA:oxalate CoA-transferase EC 2.8.3.20: succinyl-CoA—D-citramalate CoA-transferase EC 2.8.3.21: L-carnitine CoA-transferase EC 2.8.3.22: succinyl-CoA—L-malate CoA-transferase EC 2.8.3.23: caffeate CoA-transferase EC 2.8.3.24: (''R'')-2-hydroxy-4-methylpentanoate CoA-transferase EC 2.8.3.25: bile acid CoA-transferase EC 2.8.3.26: succinyl-CoA:mesaconate CoA transferase
== See also == NMR spectroscopy Nuclear magnetic resonance Nuclear magnetic resonance spectroscopy of carbohydrates Nuclear magnetic resonance spectroscopy of nucleic acids Protein crystallization Protein dynamics Relaxation (NMR) X-ray crystallography
To get more control on the regiospecific polymer synthesis, copolymerization was proposed. One of these methods is introducing the precursor polymer made from copolymerization of VF2 with either 1-chloro-2,2-difluoroethylene (CVF2) or 1-bromo-2,2-difluoroethylene (BVF2). The chlorinated or brominated monomers are attacked at their CF2 carbon by growing –CH2CF2∙ radical. After reductive dechlorination or debromination with tri-n-butyltin hydride they become a reversed VF2 unit in the final polymer. Therefore, a regioisomer of PVDF is formed.
Specialist Physiotherapist in Parkinson's Disease, University Hospitals of Derby and Burton NHS Foundation Trust. For services to Physiotherapy. Brenda Anne Lines. Chair, Big Local DY10. For services to the community in Kidderminster, Worcestershire. Richard John Linley. Lately Senior Inspector of Courses, British Horseracing Authority. For services to Horse Racing. Antony Lishak. Chief Executive, Learning from the Righteous. For services to Holocaust Education. Sharon Louise Livermore. Founder, Domestic Abuse Education and Director, Kameo Recruitment. For services to the Victims of Domestic Abuse. Shalom Ijeoma Lloyd. Director, Naturally Tiwa Skincare. For services to International Trade and to Women in Business. Dr. Leonard Malcolm Lofts. Patron and Lately Chief Executive, Northam Care Trust. For services to People with Disabilities in Devon. Joanne Elizabeth Loftus. Lately Civil Secretary, Ministry of Defence. For services to Defence. Louise Long. Chief Executive, Inverclyde Council. For services to Local Government and to the community in Inverclyde, Renfrewshire. Maria Victoria Rodriguez Lopez. Head of Partnerships, Scottish Government. For services to Minority Ethnic Communities in Scotland during Covid-19. Paul John Lord. Director of Sport and Senior Leader, Westcroft Special School. For services to Children and Young People with Special Educational Needs. Andrew McLauchlan Lothian. Founder and Director, Insights Learning and Development. For services to Personal and Professional Development. Dickon Rutherford Love. For services to Bell-Ringing in London and Kent.
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。
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。