Everything below concerns Immune modulation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
Lyophilized material is generally held at reduced temperature to slow degradation, and storage at minus twenty degrees Celsius or lower is common practice for long-term retention. Short-term working portions are often kept between two and eight degrees Celsius. Once dissolved, the peptide is less stable than the dry powder, and repeated freeze-thaw cycles are associated with loss of material and with aggregate formation. Vials are usually allowed to reach room temperature before opening so that condensation does not introduce moisture, and solutions are protected from light where practical.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography, which separates the peptide from closely related impurities and from truncated or oxidized variants. Mass spectrometry supplies the molecular mass and confirms the expected sequence length, while amino acid analysis can be used to check composition. Because the molecule has no chromophore beyond the peptide backbone, ultraviolet detection is typically performed at a low wavelength, where baseline interference from solvents and buffers is a practical concern. Water content and counter-ion content are often reported alongside purity.
| 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 alpha 1 is a synthetic 28-amino-acid peptide first isolated in 1966 from thymosin fraction 5, a bovine thymus extract. Its chain begins with an acetylated serine residue and ends with asparagine. The native peptide carries a molecular mass near 3,108 daltons. Researchers classify it as an immunomodulatory agent rather than a hormone with a single endocrine target. Early work framed it as a thymus-derived factor that supports T-cell maturation. The synthetic form used in research and clinical products matches the natural sequence.
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.
Identity and purity are normally assessed by reversed-phase high-performance liquid chromatography, which separates the peptide from related impurities and truncation products. Mass spectrometry confirms molecular mass and detects modifications such as deamidation or oxidation. Amino acid analysis and peptide mapping provide additional sequence-level confirmation. For research material, a certificate of analysis typically reports these results together with water content and counter-ion identity, since the lyophilized powder is often supplied as an acetate or trifluoroacetate salt.
Several factors accelerate degradation: alkaline pH, elevated temperature, exposure to oxidants, and the presence of residual moisture. Deamidation of asparagine residues and oxidation of methionine are the most commonly reported degradation routes. Because the peptide lacks disulfide bonds, it does not undergo the thiol-related aggregation seen in some other biologics, but physical aggregation can still occur at high concentration. Stability data are product-specific, and extrapolating shelf life between formulations is not reliable.
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.
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.
A similar promotion was held in September 2011, near the start of a traditional school year, encouraging the use of the game as an educational tool for science and mathematics. Valve wrote that they felt that Portal "makes physics, math, logic, spatial reasoning, probability, and problem-solving interesting, cool, and fun", a necessary feature to draw children into learning. This was tied to Digital Promise, a United States Department of Education initiative to help develop digital tools for education, which Valve is part of. Portal: Still Alive was announced for Xbox Live Arcade at the 2008 E3 convention, and was released on October 22, 2008. It features the original game, 14 new challenges, and new achievements. The additional content was based on levels from the map pack Portal: The Flash Version created by We Create Stuff and contains no additional story-related levels. According to Valve spokesman Doug Lombardi, Microsoft had previously rejected Portal on the platform due to its large size. Portal: Still Alive was well received by reviewers. 1UP.com's Andrew Hayward stated that, with the easier access and lower cost than paying for The Orange Box, Portal is now "stronger than ever". IGN editor Cam Shea ranked it fifth on his top 10 list of Xbox Live Arcade games. He stated that it was debatable whether an owner of The Orange Box should purchase this, as its added levels do not add to the plot. However, he praised the quality of the new maps included. The game ranked 7th in a later list of top Xbox Live Arcade titles compiled by IGN's staff in September 2010.
Relugolix is a selective antagonist of the gonadotropin-releasing hormone receptor (GnRHR), with a half-maximal inhibitory concentration (IC50) of 0.12 nM. A dosage of relugolix of 40 mg once per day has been found to suppress estradiol levels to postmenopausal levels (<20 pg/mL) within 24 hours in premenopausal women. In the control group of women, estradiol levels fluctuated between 50 and 250 pg/mL. Estradiol levels have been found to return to normal concentrations within 4 weeks of discontinuation of relugolix in premenopausal women. The medication additionally suppresses levels of progesterone, luteinizing hormone, and follicle-stimulating hormone in premenopausal women. Relugolix at a dosage of 40 mg or more once per day has been found to reduce testosterone levels to sustained castrate levels (<20 ng/dL) in men. It additionally suppresses luteinizing hormone and follicle-stimulating hormone levels in men. Lower doses of relugolix (<40 mg/day) are under investigation for achieving partial sex hormone suppression in the treatment of endometriosis and uterine fibroids. This is intended to reduce the incidence and severity of menopausal symptoms such as hot flushes and decreased bone mineral density that are secondary to estrogen deficiency.
== History == Because of its central geographic position within the Yugoslav federation, post-war Bosnia was strategically selected as a base for the development of the military defense industry. This contributed to a large concentration of arms and military personnel in Bosnia; a significant factor in the war that followed the break-up of Yugoslavia in the 1990s. However, Bosnia's existence within Yugoslavia, for the large part, was peaceful and prosperous. Being one of the poorer republics in the early 1950s it quickly recovered economically, taking advantage of its extensive natural resources to stimulate industrial development. The Yugoslavian communist doctrine of "brotherhood and unity" particularly suited Bosnia's diverse and multi-ethnic society that, because of such an imposed system of tolerance, thrived culturally and socially. The improvements to cultural tolerance throughout Bosnia and Herzegovina culminated with the selection of Sarajevo to host the 1984 Winter Olympics.
Sources: en.wikipedia.org
== Clinical significance == GSH is a key cellular antioxidant and plays a major role in the phase 2 metabolic clearance of electrophilic xenobiotics. The importance of the GSH pathway and enzymes that affect this delicate balance is gaining an increased level of attention in recent years. Although glutathione reductase has been an attractive target for many pharmaceuticals, there have been no successful glutathione reductase related therapeutic compounds created to date. In particular, glutathione reductase appears to be a good target for anti-malarials, as the glutathione reductase of the malaria parasite Plasmodium falciparum has a significantly different protein fold than that of mammalian glutathione reductase. By designing drugs specific to p. falciparum it may be possible to selectively induce oxidative stress in the parasite, while not affecting the host. There are two main classes of GR targeting compounds:
In the fields of medicine, biotechnology, and pharmacology, drug discovery is the process by which new candidate medications are discovered. Historically, drugs were discovered by identifying the active ingredient from traditional remedies or by serendipitous discovery, as with penicillin. More recently, chemical libraries of synthetic small molecules, natural products, or extracts were screened in intact cells or whole organisms to identify substances that had a desirable therapeutic effect in a process known as classical pharmacology. After sequencing of the human genome allowed rapid cloning and synthesis of large quantities of purified proteins, it has become common practice to use high-throughput screening of large compound libraries against isolated biological targets which are hypothesized to be disease-modifying in a process known as reverse pharmacology. Hits from these screens are then tested in cells and then in animals for efficacy. Modern drug discovery involves the identification of screening hits, medicinal chemistry, and optimization of those hits to increase the affinity, selectivity (to reduce the potential of side effects), efficacy and potency, metabolic stability (to increase the half-life), and oral bioavailability. Once a compound that fulfills all of these requirements has been identified, the process of drug development can continue. If successful, clinical trials are developed.
Pharmaceutical form Chemical form Route of administration Stability Metabolism These concepts, which are discussed in detail in their respective titled articles, can be mathematically quantified and integrated to obtain an overall mathematical equation:
Sources: en.wikipedia.org
CyRL-QN15 is a cyclic heptapeptide derivative with the sequence CQFHYMC, linked by a disulphide bond between the two cysteine residues. It was derived from peptides found in the skin of the frog Rana limnocharis. It enhances wound healing and has been researched for the treatment of diabetic ulcers. It has several different mechanisms of action, including acting as an antagonist at TLR4 and indirectly activating SIRT1.
Acheson SA, Kirkman HN, Wolfenden R (1988). "Equilibrium of 5,6-hydration of NADH and mechanism of ATP-dependent dehydration". Biochemistry. 27 (19): 7371–5. doi:10.1021/bi00419a030. PMID 3061454. MEINHART JO, CHAYKIN S, KREBS EG (1956). "Enzymatic conversion of a reduced diphosphopyridine nucleotide derivative to reduced diphosphopyridine nucleotide". J. Biol. Chem. 220 (2): 821–9. doi:10.1016/S0021-9258(18)65307-4. PMID 13331940. Regueiro V, Campos MA, Pons J, Alberti S, Bengoechea JA (2006). "The uptake of a Klebsiella pneumoniae capsule polysaccharide mutant triggers an inflammatory response by human airway epithelial cells". Microbiology. 152 (Pt 2): 555–66. doi:10.1099/mic.0.28285-0. PMID 16436443.
The history of Poland spans over a thousand years, from medieval tribes, Christianization and monarchy; through Poland's Golden Age, expansionism and becoming one of the largest European powers; to its collapse and partitions, two world wars, communism, and the restoration of democracy. The roots of Polish history can be traced to ancient times, when the territory of present-day Poland was inhabited by diverse ethnic groups, including Celts, Scythians, Sarmatians, Slavs, Balts and Germanic peoples. However, it was the West Slavic Lechites, the closest ancestors of ethnic Poles, who established permanent settlements during the Early Middle Ages. The Lechitic Western Polans, a tribe whose name denotes "people living in open fields", dominated the region and gave Poland—which lies in the North-Central European Plain—its name. The first ruling dynasty, the Piasts, emerged in the 10th century AD. Duke Mieszko I, regarded as the creator of Polish statehood, adopted Western Christianity in 966 AD. Mieszko's dominion was formally reconstituted as a medieval kingdom in 1025 by his son Bolesław I the Brave, known for his military expansions. The most successful and the last Piast monarch, Casimir III the Great, presided over a period of economic prosperity and territorial aggrandizement before his death in 1370 without male heirs.
The two basic categories of tequila are mixtos and 100% agave. Mixtos use no less than 51% agave, with other sugars making up the remainder. Mixtos use both glucose and fructose sugars. There are five categories of tequila defined by the NOM:
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。
Cool storage below freezing is usual for long-term retention, with a desiccant and protection from light. Portions are often split before first use to avoid repeated handling.