If you have been reading about 免疫组织 and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-09-02. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
The peptide was identified during work in the 1970s on thymosin fraction 5, a partially purified extract of calf thymus. Investigators separated that mixture and characterized individual components, one of which they named thymosin alpha-1. The same compound later received the international nonproprietary name thymalfasin. Commercial material is produced by solid-phase peptide synthesis rather than by extraction, so synthetic and natural forms share an identical sequence. Naming conventions vary across the literature, and readers should distinguish the alpha-1 peptide from other thymosins that have unrelated sequences and functions.
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.
| 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 |
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.
The peptide is generated in cells by cleavage of prothymosin alpha, a larger acidic protein encoded by the PTMA gene. Prothymosin alpha is expressed in many tissues, not only in the thymus, and its functions include nuclear roles in chromatin-related processes. The 28-residue fragment corresponds to the N-terminal portion of that precursor. How the cleavage occurs and how the fragment's concentration is regulated remain open questions; circulating amounts are small and difficult to measure reliably with routine assays.
Thymosin alpha 1 is a short peptide first isolated from bovine thymus tissue in the early 1970s during fractionation work aimed at identifying factors that influence T cell development. It belongs to a family of acidic thymic peptides, and the original preparations contained several components that were later separated by chromatography. The compound is now produced synthetically rather than extracted from tissue, which removes batch variability tied to animal sourcing. Researchers describe it as an immunomodulatory peptide because laboratory studies show effects on several cell types of the innate and adaptive immune systems.
Whether the free 28-residue peptide circulates in human tissue remains debated. The best-documented human source is prothymosin alpha, a larger acidic protein that carries the sequence at its N-terminus. Reports of measurable peptide levels in serum and lymphoid tissue exist, yet some of that signal may come from cross-reacting fragments or from the parent protein. Most reviews therefore treat prothymosin alpha as the established human molecule and describe independent circulation of the small peptide as an unresolved question.
Immunological studies connect the peptide to multiple parts of the immune response. It has been reported to engage Toll-like receptor signaling, to promote dendritic cell maturation, and to influence the balance of T helper cell subsets. Changes in natural killer cell activity and in cytokine release appear in cell culture and animal models. These observations describe broad immunomodulatory behavior rather than a single defined receptor target, and the primary molecular interaction has not been settled.
Thymosin alpha-1 is a synthetic 28-amino-acid peptide whose sequence was first identified in extracts of bovine thymus tissue during the 1970s. The chain carries an acetyl group on its N-terminal serine. Its acidic residue content is high, which produces strong water solubility and an isoelectric point well below neutrality. Material supplied for laboratory and clinical use is manufactured by solid-phase peptide synthesis rather than purified from animal tissue. Different salt forms, such as the acetate, alter the counter-ion content without changing the peptide backbone.
Leukopenia and liver damage of the cholestatic type with or without jaundice have additionally been seen; the original manufacturer Roche recommends regular laboratory examinations to be performed routinely. Ambulatory patients should be warned that bromazepam may impair the ability to drive vehicles and to operate machinery. The impairment is worsened by consumption of alcohol, because both act as central nervous system depressants. During the course of therapy, tolerance to the sedative effect usually develops.
== Safety == Theacrine has demonstrated clinical safety and non-habituating effects in healthy humans over eight weeks of daily use at up to 300 mg/day. Moreover, there was no evidence of the tachyphylaxis typical of neuroactive agents like caffeine and other stimulants. In animal studies, theacrine has an LD50 of 810 mg/kg, compared to 265 mg/kg for caffeine.
==== Deluge of wars ==== During the reign of John II Casimir Vasa (r. 1648–1668), the third and last king of his dynasty, the nobles' democracy fell into decline as a result of foreign invasions and domestic disorder. These calamities multiplied rather suddenly and marked the end of the Polish Golden Age. Their effect was to render the once powerful Commonwealth increasingly vulnerable to foreign intervention.
=== Political changes in East Germany === On 18 October 1989, longtime Socialist Unity Party of Germany (SED) leader Erich Honecker stepped down in favor of Krenz. Honecker had been seriously ill, and those looking to replace him were initially willing to wait for a "biological solution", but by October were convinced that the political and economic situation was too grave. Honecker approved the choice, naming Krenz in his resignation speech, and the Volkskammer duly elected him. Although Krenz promised reforms in his first public speech, he was considered by the East German public to be following his predecessor's policies, and public protests demanding his resignation continued. Despite promises of reform, public opposition to the regime continued to grow. On 1 November, Krenz authorized the reopening of the border with Czechoslovakia, which had been sealed to prevent East Germans from fleeing to West Germany. On 4 November, the Alexanderplatz demonstration took place. On 6 November, the Interior Ministry published a draft of new travel regulations, which made cosmetic changes to Honecker-era rules, leaving the approval process opaque and maintaining uncertainty regarding access to foreign currency. The draft enraged ordinary citizens, and was denounced as "complete trash" by West Berlin Mayor Walter Momper. Hundreds of refugees crowded onto the steps of the West German embassy in Prague, enraging the Czechoslovaks, who threatened to seal off the East German–Czechoslovak border.
Sources: en.wikipedia.org
===== India, Russia and CIS countries ===== Valparin Chrono by Sanofi India Valprol CR by Intas Pharmaceutical (India) Encorate Chrono by Sun Pharmaceutical (India) Serven Chrono by Leeven APL Biotech (India)
== Putative SLCs == Putative SLCs, also called atypical SLCs, are novel, plausible secondary active or facilitative transporter proteins that share ancestral background with the known SLCs. The atypical SLCs of MFS type can, however, be subdivided into 15 Putative MFS Transporter Families (AMTF). All the putative SLCs are plausible SLC transporters. Some are only "atypical" when it comes to their nomenclature; the genes have an SLC assignment but as an alias, and have retained their already assigned "non-SLC" gene symbol as the approved symbol. Here are some Putative SLCs listed: OCA2, CLN3, TMEM104, SPNS1, SPNS2, SPNS3, SV2A, SV2B, SV2C, SVOP, SVOPL, MFSD1, MFSD2A, MFSD2B, MFSD3, MFSD4A, MFSD4B, MFSD5, MFSD6, MFSD6L, MFSD8, MFSD9, MFSD10, MFSD11, MFSD12, MFSD13A, MFSD14A, MFSD14B, UNC93A and UNC93B1.
The pitot tube and static port on an aircraft are used to determine the airspeed of the aircraft. These two devices are connected to the airspeed indicator, which determines the dynamic pressure of the airflow past the aircraft. Bernoulli's principle is used to calibrate the airspeed indicator so that it displays the indicated airspeed appropriate to the dynamic pressure. A De Laval nozzle utilizes Bernoulli's principle to create a force by turning pressure energy generated by the combustion of propellants into velocity. This then generates thrust by way of Newton's third law of motion. The flow speed of a fluid can be measured using a device such as a Venturi meter or an orifice plate, which can be placed into a pipeline to reduce the diameter of the flow. For a horizontal device, the continuity equation shows that for an incompressible fluid, the reduction in diameter will cause an increase in the fluid flow speed. Subsequently, Bernoulli's principle then shows that there must be a decrease in the pressure in the reduced diameter region. This phenomenon is known as the Venturi effect. The maximum possible drain rate for a tank with a hole or tap at the base can be calculated directly from Bernoulli's equation and is found to be proportional to the square root of the height of the fluid in the tank. This is Torricelli's law, which is compatible with Bernoulli's principle. Increased viscosity lowers this drain rate; this is reflected in the discharge coefficient, which is a function of the Reynolds number and the shape of the orifice.
=== The IGF system === IGF1 is part of the insulin-like growth factor (IGF) system. This system consists of three ligands (insulin, IGF1 and IGF-2), two tyrosine kinase receptors (insulin receptor and IGF1R receptor) and six ligand binding proteins (IGFBP 1–6). Together they play an essential role in proliferation, survival, regulation of cell growth and affect almost every organ system in the body. Similarly to IGF1, IGF2 is mainly produced in the liver and after it is released into circulation, it stimulates growth and cell proliferation. IGF2 is thought to be a fetal growth factor, as it is essential for a normal embryonic development and is highly expressed in embryonic and neonatal tissues.
==== Expiration date ==== The expiration date, required in several countries, specifies the date up to which the manufacturer guarantees the full potency and safety of a drug. In the United States, expiration dates are determined by regulations established by the FDA. The FDA advises consumers not to use products after their expiration dates. A study conducted by the U.S. Food and Drug Administration covered over 100 drugs, prescription and over-the-counter. The results showed that about 90% of them were safe and effective far past their original expiration date. At least one drug worked 15 years after its expiration date. Joel Davis, a former FDA expiration-date compliance chief, said that with a handful of exceptions—notably nitroglycerin, insulin, and some liquid antibiotics (outdated tetracyclines can cause Fanconi syndrome)—most expired drugs are probably effective. The American Medical Association issued a report and statement on Pharmaceutical Expiration Dates. The Harvard Medical School Family Health Guide notes that, with rare exceptions, "it's true the effectiveness of a drug may decrease over time, but much of the original potency still remains even a decade after the expiration date". The expiration date is the final day that the manufacturer guarantees the full potency and safety of a medication. Drug expiration dates exist on most medication labels, including prescription, over-the-counter and dietary supplements. U.S. pharmaceutical manufacturers are required by law to place expiration dates on prescription products prior to marketing.
Sources: en.wikipedia.org
=== Congenital adrenal hyperplasia === In congenital adrenal hyperplasia, the adrenal cortex lacks appropriate corticosteroid synthesis, leading to excess adrenal androgens and affects female fetuses. There is an external masculinization of the genitalia in the female fetuses. Mothers of at risk fetuses are given dexamethasone at 6 weeks gestation to suppress pituitary gland release of androgens. If analysis of cffDNA obtained from a sample of maternal plasma lacks genetic markers found only on the Y chromosome, it is suggestive of a female fetus. However, it might also indicate a failure of the analysis itself (a false negative result). Paternal genetic polymorphisms and sex-independent markers may be used to detect cffDNA. A high degree of heterozygosity of these markers must be present for this application.
This led to a technological revolution caused by the invention of Orbments, mechanical devices varying greatly in size and scope that run off orbal energy, powering everyday appliances up to mecha and other large machinery. Orbal energy also allowed for the casting of magic-like "arts", which exist in seven elemental forms. Trails also features sociopolitical elements, with subjects such as imperialism, classism, and immigration being a part of the narrative. In contrast with many other role-playing games, nearly every non-playable character in the series has a name, with most having their own character arcs of varying degrees of importance to the main plot. Trails is expected to end with its final entry by 2032.
=== Feminist collages === In February 2019, she began posting collages which featured brief feminist slogans in public spaces across France, particularly in Paris and Marseille. Her collages are composed of black letters painted one by one on white sheets. Her first slogan was "Since I was 13, men have commented on my physical appearance in the street."
=== United Cup === Zverev has started his season every year since 2023 by participating in the United Cup. In 2023, Zverev and Team Germany were placed in Group C alongside the Czech Republic and the USA. Against the Czech Republic, he lost to Jiří Lehečka. The Czech Republic won the tie over Germany 3–2. Against the US, he lost to Taylor Fritz. The USA beat Germany 5–0. Germany failed to qualify for the knockout round and ended third in Group C. In 2024, Zverev returned to the United Cup in Sydney, Australia for the second consecutive year, leading Team Germany alongside Angelique Kerber. He won both of his singles matches in the round-robin stage, defeating Lorenzo Sonego of Italy and Adrian Mannarino of France both in three sets. He played both mixed doubles matches in both ties with Angelique Kerber, partnering for the first time since 2019, and won against Team Italy but not Team France. Despite this, Team Germany managed to qualify as the best runner-up team from all countries participating in Sydney, advancing to the quarterfinals against Greece. There, Zverev decisively won his singles match against Stefanos Tsitsipas and his mixed doubles match, partnering with doubles specialist Laura Siegemund, against Maria Sakkari and Petros Tsitsipas. In the semifinal tie against Australia, Zverev was defeated by Alex de Minaur in three sets, allowing the Australian to crack the top 10 after previously making top 10 wins against Taylor Fritz and Novak Djokovic earlier that week.
==== 1993–1997 ==== Under Bill Clinton (President 1993–2001) and P. V. Narasimha Rao (Prime Minister 1991–1996) both sides mishandled relations, according to Arthur G. Rubinoff. Clinton simultaneously pressured India to liberalize its economy while criticizing New Delhi on human rights and nuclear issues. In the face of criticism from Washington and opposition at home, Indian leaders lost their enthusiasm for rapprochement and reverted to formalistic protocol over substantive diplomacy. The Brown Amendment that restored American aid to Pakistan in 1995 was an irritant. In returning to a Cold War style rhetoric, Indian parliamentarians and American congressmen demonstrated their unwillingness to establish a new relationship.
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 28-residue synthetic peptide studied as an immune-modulating agent and approved as a drug in some countries. The sequence matches a naturally occurring fragment isolated from thymus tissue. It is not a hormone in the endocrine sense.