Thymalfasin raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-07-28 and is reviewed periodically as new material appears.
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。
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.
| 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 |
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.
Clinical interest has centered on chronic viral hepatitis, on immune restoration in various conditions, and on use as an adjuvant intended to improve responses to vaccines. Trials have reported mixed results, and regulatory status differs sharply between countries; in some places it is a prescription product, while elsewhere it is sold without an approved therapeutic indication. Because published studies vary widely in design, population, and endpoints, comparisons across them are difficult and no single conclusion covers the whole literature.
Thymosin alpha 1 is a short peptide of 28 amino acid residues that derives from the amino terminal region of a larger precursor protein known as prothymosin alpha. The peptide carries an acetyl group on its first residue and contains no disulfide bonds or carbohydrate chains. Its sequence is highly conserved across mammalian species, which is one reason laboratories treat it as a molecule with a defined and reproducible structure rather than a variable tissue extract. The name follows an early naming convention for thymus-derived fractions and does not imply that the peptide acts as a hormone in the classical endocrine sense.
Biologically, the peptide is studied mainly in the context of immune cell development and regulation. It is produced in the thymus and in several other tissues, and it appears to influence the maturation and activity of T cells and other immune populations. Laboratory work describes effects on cytokine production, on the balance between T cell subsets, and on the function of dendritic cells. Much of this evidence comes from cell culture and animal models, so the extent to which the same pathways operate in humans remains an open question.
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.
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.
{\displaystyle {\begin{aligned}&{\frac {dS}{dt}}=-{\frac {\beta (t)IS}{N}}-v(t)S,\\[6pt]&{\frac {dI}{dt}}={\frac {\beta (t)IS}{N}}-\gamma (t)I,\\[6pt]&{\frac {dR}{dt}}=\gamma (t)I,\\[6pt]&{\frac {dV}{dt}}=v(t)S,\end{aligned}}}
The report also finds over 400,000 New Zealanders receiving welfare. McDonald's New Zealand is denied resource consent to build a restaurant in Wānaka due to strong local opposition. 13 February: The Public Service Association challenges Health New Zealand's proposed digital and IT job cuts, claiming they breached employment law. Crown Research Institute Callaghan Innovation proposes slashing 63 jobs in response to Government plans to disestablish the organisation. 14 February – Director-General of Health Diana Sarfati resigns. 15 February: A bush fire in North Canterbury causes a section of State Highway 7 to close and several homes to evacuate. Members of Destiny Church's "Man Up" group disrupt a "Pride and Rainbow" event at Te Atatū's library. The church's actions were condemned by Prime Minister Luxon, Mayor of Auckland Wayne Brown, Acting Waitematā District Commander Inspector Simon Walker and Labour leader Chris Hipkins. Foreign Minister Winston Peters announces that New Zealand will be considering the newly ratified Chinese–Cook Islands strategic partnership agreement in light of its national interests and constitutional relationship with the Cook Islands. 17 February: The New Zealand Police launch an investigation into assault complaints during a protest by Destiny Church members against a rainbow event at Te Atatū's library. Immigration New Zealand temporarily suspends deportation proceedings against New Zealand-born teenager Daman Kumar and his mother Sunita Devi (who both hold Indian citizenship) pending a ministerial review.
Lissencephaly A rare brain malformation where the cerebral cortex lacks normal folds (gyri), leading to developmental delay and seizures. Long-term depression (LTD) A long-lasting decrease in synaptic strength following low-frequency stimulation. Thought to be important in motor learning and memory pruning. Long-term memory Stored information retained for extended periods—from hours to years. Includes declarative (explicit) and non-declarative (implicit) forms. Long-term potentiation (LTP) A long-lasting enhancement in signal transmission between two neurons that results from their synchronous activation. A major cellular mechanism underlying learning and memory. Low-threshold spikes A burst of action potentials generated by the activation of low-threshold, T-type calcium channels in response to a small depolarization from a hyperpolarized membrane potential. Commonly observed in thalamic neurons, low-threshold spikes enable rhythmic firing and are important for sleep-related oscillations and sensory signal gating. Lower motor neuron A neuron that directly innervates skeletal muscle. Damage to these neurons causes flaccid paralysis, muscle atrophy, and loss of reflexes. LTP induction The process of initiating long-term potentiation through specific patterns of synaptic stimulation, such as high-frequency tetanic stimulation. Lucid dreaming A state during which the dreamer is aware that they are dreaming and may be able to exert control over the dream. Associated with increased prefrontal cortex activity.
==== tiab-tiap ==== tiabendazole (INN) tiacrilast (INN) tiadenol (INN) tiafibrate (INN) tiagabine (INN) Tiamate tiamenidine (INN) tiametonium iodide (INN) tiamiprine (INN) tiamizide (INN) Tiamol tiamulin (INN) tianafac (INN) tianeptine (INN) tiapamil (INN) tiapirinol (INN) tiapride (INN) tiaprofenic acid (INN) tiaprost (INN)
Sources: en.wikipedia.org
=== Contamination === A 2011 survey of 33 supplements commercially available in Italy found that over 50% of them exceeded the European Food Safety Authority recommendations in at least one contaminant. The most prevalent of these contaminants was creatinine, a breakdown product of creatine also produced by the body. Creatinine was present in higher concentrations than the European Food Safety Authority recommendations in 44% of the samples. About 15% of the samples had detectable levels of dihydro-1,3,5-triazine or a high dicyandiamide concentration. Heavy metals contamination was not found to be a concern, with only minor levels of mercury being detectable. Two studies reviewed in 2007 found no impurities.'
The vast majority of plants are C3, meaning they photorespire when necessary. Certain species of plants or algae have mechanisms to lower the uptake of molecular oxygen by RuBisCO. These are commonly referred to as Carbon Concentrating Mechanisms (CCMs), as they increase the concentration of CO2 so that RuBisCO is less likely to produce glycolate through reaction with O2.
Graphite (graphene) oxide has also been prepared by using a "bottom-up" synthesis method (Tang-Lau method) in which the sole reagent source is glucose; the process is safer, simpler, and more environmentally friendly compared to the traditional "top-down" method, in which strong oxidizers are involved. Another important advantage of the Tang-Lau method is the control of thickness, ranging from monolayer to multilayers, by adjusting growth parameters.
== Further reading == Mishra, NK; Agarwal, S; Raghava, GP (July 2010). "Prediction of cytochrome P450 isoform responsible for metabolizing a drug molecule". BMC Pharmacology. 10: 8. doi:10.1186/1471-2210-10-8. PMC 2912882. PMID 20637097.
== Reception == Anathem received several positive reviews. Paul Boutin wrote in The Wall Street Journal that "the lasting satisfaction of Anathem derives … from Mr. Stephenson's wry contempt for today's just-Google-it mindset. His prose is dense, but his worldview contagious." On Salon.com, Andrew Leonard described the book as "a page turner and a philosophical argument, an adventure novel and an extended existential meditation, a physics lesson, sermon and ripping good yarn." Michael Dirda of The Washington Post disagreed, remarking that "Anathem will certainly be admired for its intelligence, ambition, control and ingenuity", but describing it as "fundamentally unoriginal", "grandiose, overwrought and pretty damn dull." David Itzkoff of The New York Times concluded that "Anathem spends so much time engaged in copying, in conjuring up alternative formulations of our real-world science and religion, that it forgets to come up with much that is new or true." The novel entered The New York Times Best Seller list for Hardcover Fiction at number one and achieved the rare distinction for a novel of being reviewed in the scientific journal Nature. Anathem won the Locus Award for Best Science Fiction Novel in 2009 and collected nominations for the Hugo, Arthur C. Clarke, and John W. Campbell Memorial Awards the same year. In 2008, the novel received a nomination for the British Science Fiction Award.
Sources: en.wikipedia.org
March 11: Decree improving breastfeeding conditions in industrial and commercial establishments (dedicated rooms, breastfeeding facilities, cribs, and qualified staff). December 3: Decree enacting the International Convention for the Suppression of the Traffic in Women and Children (signed September 30, 1921); France adhered in January 1926 with reservations regarding colonies, protectorates, or mandates. December 7: Law amending Article 72 of Book II of the Labor and Social Welfare Code (list of jobs prohibited to children under 18 and to women). December 1: Maritime Labor Code; a married woman may not board a ship without her husband's permission—or court authorization. 1927
==== Fake news about the alleged "Taxation of Pix" ==== At the beginning of January 2025, a regulation (IN RFB No. 2219/2024) entered into force, which changed the way the Federal Revenue of Brazil monitors transactions via Pix and credit card in order to reinforce the fight against illicit operations. With this measure, all financial institutions, including digital banks and payment apps, became obliged to report monthly movements above 5,000 reais for individuals and 15,000 for companies. The Revenue Service stressed that financial transactions would not suffer increases in taxes, only that they would be subject to additional inspection to monitor atypical movements, such as the non-declaration of income tax by individuals who move more than 5,000 reais monthly. Since 2003, financial monitoring has been carried out through Decred (current e-Financeira), the Revenue Service system that tracks transactions made with credit cards. With the regulation that entered into force in 2025, monitoring was expanded to include transactions via Pix, sales made through card readers, payments with debit cards, store cards and virtual currencies, movements that would be reported to the Federal Revenue Service. However, with the beginning of the inspection, fake news about the alleged taxation of Pix began circulating on social media. According to the false information, the Federal Revenue Service would create or increase taxation on the system, which would lead companies to pass on the costs to consumers.
== Research == Biggar's research includes many different areas from different fields within molecular biology, biochemistry, and physical biochemistry. His main areas of research interest are Oxidative Cell Stress, Functional Proteomics, Bioinformatics, and Molecular Pharmacology. He is particularly known for his research in the new field of Non-histone Lysine Methylation and its relation to both functional proteomics and cell stress.
Cigarette smoking has been found to affect global epigenetic regulation of transcription across tissue types. Studies have shown differences in epigenetic markers such as DNA methylation, histone modifications and miRNA expression between smokers and non-smokers. Similar differences exist in children whose mothers smoked during pregnancy. These epigenetic effects are thought to be linked to many of negative health effects associated with smoking. Studies have shown an association between prenatal exposure to environmental tobacco smoke and conduct disorder in children. As well, postnatal tobacco smoke exposure may cause similar behavioral problems in children.
=== 17 May === The Security Service of Ukraine identified and charged six individuals with "illegally disseminating" information about Ukrainian air defences in Kyiv. These individuals took videos of Ukrainian air defences in action then posted them on social media sites such as YouTube. Such information, the SBU alleged, could be used to make Russian strikes more accurate. The penalty for such a charge was five to eight years imprisonment. Russia's defence ministry claimed its forces had destroyed a British-made L-119 howitzer in Ukraine according to a report by state news agency TASS. It also claimed to have struck an ammunition depot in Mykolaiv. The DSM Capella, the last ship to sail under the Black Sea Grain Initiative before its expected expiration on 18 May, left the Ukrainian port of Chornomorsk carrying 30,000 tonnes of corn bound for Turkey. Shortly afterwards, Turkish President Recep Tayyip Erdoğan said that the grain exportation deal between Ukraine and Russia had been extended for two more months. Both Russia and Ukraine welcomed the extension. A child and two others were reported to have been killed and three people were injured after a Russian shell struck outside a shop in Zelenivka, Kherson Oblast. In Donetsk, the city's Russian-backed mayor claimed Ukrainian shelling left five dead and 15 injured.
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。
It is a chain of 28 amino acids, with an acetyl group attached to the first serine residue. The synthetic version replicates this sequence. Its molecular mass is about 3,108 daltons.