A practical reference on 胸腺素α1: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-07-26 and is reviewed periodically as new material appears.
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。
Reverse-phase high-performance liquid chromatography is the standard technique for assessing purity and concentration, because the peptide's hydrophobicity allows clean separation from related impurities. Mass spectrometry confirms molecular identity and detects sequence errors or truncations. Amino acid analysis and peptide mapping supply additional structural confirmation when required. Chromatographic purity values reported on certificates of analysis describe the proportion of the main peak and do not by themselves establish biological activity.
Like most short peptides, thymosin alpha-1 is susceptible to hydrolysis under strongly acidic or basic conditions and to oxidation when exposed to air over long periods. The acetylated amino terminus blocks one common degradation route, which contributes to the molecule's relative robustness in solution. Lyophilized material generally retains potency for extended periods when kept cold and dry. Once reconstituted, aqueous solutions are less stable and are typically used within a defined window rather than held indefinitely at ambient temperature.
Routine handling calls for storage of the lyophilized powder at refrigerated temperatures, away from light, in a sealed container. Working solutions are often prepared in sterile water or buffer and kept cold between uses. Repeated freeze-thaw cycles are generally avoided because they can promote aggregation and loss of material. Laboratories usually record lot number, reconstitution date, and storage conditions so that any change in behavior can be traced to a specific preparation.
| 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 |
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 28-amino-acid peptide first isolated from thymosin fraction 5, a bovine thymic extract. Its sequence begins with an acetylated serine residue and carries a high proportion of acidic residues, so the molecule has a net negative charge near neutral pH. Despite the shared name, it is unrelated in sequence to the thymosin beta family. Synthetic material prepared by solid-phase peptide synthesis is identical in sequence to the natural peptide.
Several names appear in the literature for this peptide, including thymalfasin and the abbreviation T-alpha-1. Naming conventions differ among research articles, regulatory documents, and supplier catalogs, which complicates literature searches. Both synthetic and recombinant production routes yield a peptide with the same 28-residue sequence as the thymic isolate. Because the thymosin label also covers unrelated peptides, sources should be compared by sequence rather than by name alone.
=== Piast monarchy under Casimir I, Bolesław II and Bolesław III === Bolesław I's expansive rule overstretched the resources of the early Polish state, and it was followed by a collapse of the monarchy. Recovery took place under Casimir I the Restorer (r. 1039–1058). Casimir's son Bolesław II the Generous (r. 1058–1079) became involved in a conflict with Bishop Stanislaus of Szczepanów that ultimately caused his downfall. Bolesław had the bishop murdered in 1079 after being excommunicated by the Polish church on charges of adultery. This act sparked a revolt of Polish nobles that led to Bolesław's deposition and expulsion from the country. Around 1116, Gallus Anonymus wrote a seminal chronicle, the Gesta principum Polonorum, intended as a glorification of his patron Bolesław III Wrymouth (r. 1107–1138), a ruler who revived the tradition of military prowess of Bolesław I's time. Gallus' work remains a paramount written source for the early history of Poland.
== Gosh Enterprises == Charleys Philly Steaks is a subsidiary of Gosh Enterprises, which is solely owned by Shin. Gosh also owns the Bibibop Asian Grill chain, which had purchased the leases for the defunct ShopHouse Southeast Asian Kitchen chain.
=== Macromolecular therapeutics for brain delivery === Nanomedicines designed for brain delivery/action have a difficult hurdle to overcome; they need to cross the blood brain barrier. We focus on receptor binding peptides that transcytose bound cargo into the brain. In particular, angiopep-2 (TFFYGGSRGKRNNFKTEEY) binds to LDLR (low-density lipoprotein receptor)-related protein (LRP)-1 followed by transcytosis. In collaboration with the University of Utah Department of Radiology we are developing conjugates suitable for the treatment of traumatic brain injury and Alzheimer disease.
Radon has been produced commercially for use in radiation therapy, but for the most part has been replaced by radionuclides made in particle accelerators and nuclear reactors. Radon has been used in implantable seeds, made of gold or glass, primarily used to treat cancers, known as brachytherapy. The gold seeds were produced by filling a long tube with radon pumped from a radium source, the tube being then divided into short sections by crimping and cutting. The gold layer keeps the radon within, and filters out the alpha and beta radiations, while allowing the gamma rays to escape (which kill the diseased tissue). The activities might range from 0.05 to 5 millicuries per seed (2 to 200 MBq). The gamma rays are produced by radon and the first short-lived elements of its decay chain (218Po, 214Pb, 214Bi, 214Po). After 11 half-lives (42 days), radon radioactivity is at 1/2,048 of its original level. At this stage, the predominant residual activity of the seed originates from the radon decay product 210Pb, whose half-life (22.3 years) is 2,000 times that of radon and its descendants 210Bi and 210Po. 211Rn can be used to generate 211At, which has uses in targeted alpha therapy.
=== Pulse experiments === This method required the introduction of a very small volume of concentrated tracer at the inlet of the reactor, such that it approaches the Dirac delta function. Although an infinitely short injection cannot be produced, it can be made much smaller than the mean residence time of the vessel. If a mass of tracer,
Sources: en.wikipedia.org
over a longer period of evolutionary time. Each amino acid is more or less likely to mutate into various other amino acids. For instance, a hydrophilic residue such as arginine is more likely to be replaced by another hydrophilic residue such as glutamine, than it is to be mutated into a hydrophobic residue such as leucine. (Here, a residue refers to an amino acid stripped of a hydrogen and/or a hydroxyl group and inserted in the polymeric chain of a protein.) This is primarily due to redundancy in the genetic code, which translates similar codons into similar amino acids. Furthermore, mutating an amino acid to a residue with significantly different properties could affect the folding and/or activity of the protein. This type of disruptive substitution is likely to be removed from populations by the action of purifying selection because the substitution has a higher likelihood of rendering a protein nonfunctional. If we have two amino acid sequences in front of us, we should be able to say something about how likely they are to be derived from a common ancestor, or homologous. If we can line up the two sequences using a sequence alignment algorithm such that the mutations required to transform a hypothetical ancestor sequence into both of the current sequences would be evolutionarily plausible, then we'd like to assign a high score to the comparison of the sequences. To this end, we will construct a 20x20 matrix where the
=== Passport validity length === Very few countries, such as Paraguay, just require a valid passport on arrival. However many countries and groupings now require only an identity card – especially from their neighbours. Other countries may have special bilateral arrangements that depart from the generality of their passport validity length policies to shorten the period of passport validity required for each other's citizens or even accept passports that have already expired (but not been cancelled). Some countries, such as Japan, Ireland and the United Kingdom, require a passport valid throughout the period of the intended stay. In the absence of specific bilateral agreements, countries requiring passports to be valid for at least 6 more months on arrival include Afghanistan, Algeria, Anguilla, Bahrain, Bhutan, Botswana, British Virgin Islands, Brunei, Cambodia, Cameroon, Cape Verde, Cayman Islands, Central African Republic, Chad, Comoros, Costa Rica, Côte d'Ivoire, Curaçao, Ecuador, Egypt, El Salvador, Equatorial Guinea, Fiji, Gabon, Guinea Bissau, Guyana, Haiti, India, Indonesia, Iran, Iraq, Israel, Jordan, Kenya, Kiribati, Kuwait, Laos, Madagascar, Malaysia, Marshall Islands, Mongolia, Myanmar, Namibia, Nepal, Nicaragua, Nigeria, Oman, Palau, Papua New Guinea, Peru, Philippines, Qatar, Rwanda, Samoa, Saudi Arabia, Singapore, Solomon Islands, Somalia, Sri Lanka, Sudan, Suriname, Tanzania, Thailand, Timor-Leste, Tokelau, Tonga, Turkey, Tuvalu, Uganda, United Arab Emirates, Vanuatu, Venezuela, and Vietnam.
== Function == BMPs interact with specific receptors on the cell surface, referred to as bone morphogenetic protein receptors (BMPRs). Signal transduction through BMPRs results in mobilization of members of the SMAD family of proteins. The signaling pathways involving BMPs, BMPRs and SMADs are important in the development of the heart, central nervous system, and cartilage, as well as post-natal bone development. They have an important role during embryonic development on the embryonic patterning and early skeletal formation. As such, disruption of BMP signaling can affect the body plan of the developing embryo. For example, BMP4 and its inhibitors noggin and chordin help regulate polarity of the embryo (i.e. back to front patterning). Specifically BMP-4 and its inhibitors play a major role in neurulation and the development of the neural plate. BMP-4 signals ectoderm cells to develop into skin cells, but the secretion of inhibitors by the underlying mesoderm blocks the action of BMP-4 to allow the ectoderm to continue on its normal course of neural cell development. Additionally, secretion of BMPs by the roof plate in the developing spinal cord helps to specify dorsal sensory interneurons. As a member of the transforming growth factor-beta superfamily, BMP signaling regulates a variety of embryonic patterning during fetal and embryonic development. For example, BMP signaling controls the early formation of the Müllerian duct (MD) which is a tubular structure in early embryonic developmental stage and eventually becomes female reproductive tracts.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Glucoside". Encyclopædia Britannica. Vol. 12 (11th ed.). Cambridge University Press. pp. 142–143.
Sources: en.wikipedia.org
== Toxicity == The Pompilidae family of spider wasps is known for its powerful and painful sting that is used to paralyse arachnids. Social wasps readily attack any threat to their queen and colony and are the only type of insects responsible for medically significant incidents with humans. However, PMTXs are produced by solitary spider wasps and since solitary wasps do not have a colony to defend, humans normally will not be stung by these wasps. PMTX is not listed by IARC, which suggests that there is no indication of carcinogenicity for humans, other information about the effects of PMTX on humans is currently not available. However, it is thought that it won't have a big impact on humans due to the difference in neurological setup between humans and arachnids. What is known is that being stung by a spider wasp causes local pain and swelling, and some people might have an allergic reaction to the sting which can be dangerous. The symptoms of a spider wasp sting, apart from the allergic reaction, can be treated with a cold compress. Even though humans usually will not be stung by these wasps, there have been scientists that deliberately extensively provoked spider wasps similar to PMTX-producing spider wasps, to have them stung by these animals for research on the pain inflicted by these insects. Because of these individuals, it is known that though spider wasp venom causes paralysis in their arthropod prey, they inflict intense pain that remains for around five minutes onto vertebrates such as humans.
== Research == Multiple studies have shown that LDN has promise as a treatment for chronic pain, some autoimmune disorders, and cancers. Studies on the efficacy of LDN for multiple sclerosis have been inconclusive. Clinical trials for its use as treatment of fibromyalgia were initiated in 2021. LDN is also being studied in long COVID. A 2018 therapeutic utilization review concluded that LDN may be an appropriate option for treatment of fibromyalgia and irritable bowel syndrome, but that "proper clinical trials are needed in order to establish evidence that could lead to correct indications, mode of administration, and other aspects necessary for effective clinical pharmacology of [low-dose naltrexone]." The UK's National Health Service echoed this sentiment in 2020. In a 2013 paper published in Arthritis & Rheumatology, authors Jarred Younger and Sean Mackey reported reduced circulating pro‑inflammatory cytokines and self‑reported pain in fibromyalgia patients using LDN. A 2018 review summarized mixed trial outcomes and emphasized methodological limitations. A 2023 systematic review published in the Australian Journal of General Practice found that preliminary research into the use of LDN as a treatment for fibromyalgia is promising. All clinical studies examined showed statistically significant improvements in pain and pain tolerance with mild side effects; however, sample sizes were small and the evidence is inconclusive.
== Adverse effects == The US FDA label contains a boxed warning about serious infections and malignancies. There is strong evidence that adalimumab increases risk of serious infections, such as tuberculosis, and it has also been reported to increase the risk of developing various cancers. However, such an association may reflect an increased risk of developing malignancies inherent in the conditions being treated, and not with adalimumab itself. A systematic review published in 2018, found no increased cancer incidence rate in patients with chronic inflammatory disorders treated with adalimumab and other TNF inhibitors, as compared to those who were not, with a possible exception for non-melanoma skin cancer. Injection site reactions such as redness and pain are very common, and may occur in up to 80% of cases.
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。
The lyophilized solid is normally held at 2 to 8 °C in a sealed, light-protected container. Dry storage limits both hydrolysis and microbial growth. Material kept this way remains stable for the shelf life stated by the supplier.