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Updated 2025-09-24. Numbers and descriptions here follow the published literature rather than marketing material.
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.
The peptide occurs naturally in thymic tissue and has been detected in serum and other biological fluids. Reported concentrations are low, and reliable measurement generally requires immunoassay or mass spectrometry with an enrichment step. It is released from a larger precursor, prothymosin alpha, by proteolytic cleavage, although the enzymes involved are not fully characterized. Whether circulating levels reflect thymic output specifically remains an open question.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C129H215N33O55 | Calculated for the acetylated 28-residue peptide |
| Appearance | White to off-white powder | Lyophilized solid recovered from aqueous buffer |
| Solubility | Freely soluble in water | Typically dissolved in water or buffer before use |
| Typical storage | -20 C or below, desiccated | Protect from light and avoid repeated freeze-thaw cycles |
| Identity testing | Reverse-phase HPLC with mass spectrometry | Retention time and measured mass confirm the sequence |
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.
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.
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。
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。
=== Synthesis === The sizeable number of serotonergic drugs for treating migraines all incorporate the indole nucleus found in serotonin itself. It is thus of interest that a compound based on a benzopyran manifests much the same activity.
==== Access group antibiotics ==== This group includes antibiotics that have activity against a wide range of commonly encountered susceptible pathogens while also showing lower resistance potential than antibiotics in the other groups.
Inorganic chemistry deals with synthesis and behavior of inorganic and organometallic compounds. This field covers chemical compounds that are not carbon-based, which are the subjects of organic chemistry. The distinction between the two disciplines is far from absolute, as there is much overlap in the subdiscipline of organometallic chemistry. It has applications in every aspect of the chemical industry, including catalysis, materials science, pigments, surfactants, coatings, medications, fuels, and agriculture.
Sources: en.wikipedia.org
==== MeSH E05.598.500 – disease models, animal ==== MeSH E05.598.500.249 – arthritis, experimental MeSH E05.598.500.374 – diabetes mellitus, experimental MeSH E05.598.500.468 – liver cirrhosis, experimental MeSH E05.598.500.496 – neoplasms, experimental MeSH E05.598.500.496.500 – leukemia, experimental MeSH E05.598.500.496.750 – liver neoplasms, experimental MeSH E05.598.500.496.843 – mammary neoplasms, experimental MeSH E05.598.500.496.937 – melanoma, experimental MeSH E05.598.500.496.968 – sarcoma, experimental MeSH E05.598.500.500 – nervous system autoimmune disease, experimental MeSH E05.598.500.500.500 – encephalomyelitis, autoimmune, experimental MeSH E05.598.500.500.750 – myasthenia gravis, autoimmune, experimental MeSH E05.598.500.500.875 – neuritis, autoimmune, experimental MeSH E05.598.500.750 – radiation injuries, experimental
== History == Vancomycin was first isolated in 1953 by a research team led by chemist Edmund Kornfeld at Eli Lilly, from a soil sample provided by missionary William M. Bouw. The sample had been collected in 1952 within a forest on the island of Borneo, after Bouw took over collection duties from the Reverend William W. Conley, who had been a regular contributor to Lilly's global soil screening program since 1948. This program used a network of Christian and Missionary Alliance members to obtain specimens from remote locations to identify novel microorganisms. The organism within the soil that produced the antibiotic was a previously unknown streptomycete originally named Streptomyces orientalis (later reclassified as Amycolatopsis orientalis). Initially designated as "compound 05865", the substance was identified as a distinct antibiotic on June 18, 1953, when researcher Marvin Hoehn used paper chromatography to establish its unique "fingerprint." Unlike many contemporaneous samples that resulted in the rediscovery of known agents like chloromycetin, 05865 exhibited a novel chromatographic pattern and was found to be water-soluble. One of the most difficult tasks Kornfeld's team faced was purification. The early purification method employed during that time utilized picric acid (a potentially explosive chemical); because of this, an alternate process was developed. However, this new method yielded material with a purity of only 82% and, when solubilized, produced a brown liquid termed "Mississippi mud".
== Example families == The peptide families in this section are ribosomal peptides, usually with hormonal activity. All of these peptides are synthesized by cells as longer "propeptides" or "proproteins" and truncated prior to exiting the cell. They are released into the bloodstream where they perform their signaling functions.
=== Seizures === Clonazepam, like other benzodiazepines, while being a first-line treatment for acute seizures, is not suitable for the long-term treatment of seizures due to the development of tolerance to the anticonvulsant effects. Clonazepam has been found effective in treating epilepsy in children, and the inhibition of seizure activity seemed to be achieved at low plasma levels of clonazepam. As a result, clonazepam is sometimes used for certain rare childhood epilepsies, but it is ineffective in the control of infantile spasms. Clonazepam is mainly prescribed for the acute management of epilepsy. Clonazepam is effective in the acute control of non-convulsive status epilepticus; the benefits, though, tended to be transient in many people, and the addition of phenytoin for lasting control was required in these patients. It is also approved for the treatment of typical and atypical absences (seizures) and infantile myoclonic and akinetic seizures. A subgroup of people with treatment-resistant epilepsy may benefit from long-term use of clonazepam; the benzodiazepine clorazepate may be an alternative due to its slow onset of tolerance.
Sources: en.wikipedia.org
=== Cuba (1800–1801) === On November 24, 1800, Humboldt and Bonpland departed the Venezuelan coast for Havana in a small vessel, enduring a perilous, storm-ridden journey of twenty-five days. Upon arrival, Havana presented a crowded and unsanitary environment, with a population of 44,000, half of whom were people of African descent. The city, nearly as large as New York due to its suburbs, was afflicted by yellow fever. The travelers were welcomed with receptions and enjoyed the hospitality of the local elite. Humboldt undertook a survey of the harbor, the principal commercial and naval base of Spanish colonial power in the Caribbean, correcting its geographic position. Humboldt and Bonpland then traveled into the Cuban interior, visiting sugar plantations, factories, and fields of indigo, tobacco, and cotton. They observed the harsh conditions under which enslaved people labored. Humboldt aimed to make an objective comparison between Cuba and South American societies.
Plantar fasciitis or plantar heel pain is a disorder of the plantar fascia, which is the connective tissue that supports the arch of the foot. It results in pain in the heel and bottom of the foot that is usually most severe with the first steps of the day or following a period of rest. Pain is also frequently brought on by bending the foot and toes up towards the shin. The pain typically comes on gradually. It affects both feet in about one-third of cases. The cause of plantar fasciitis is not clear. Risk factors include overuse, such as from long periods of standing, an increase in exercise, and obesity. It is associated with inward rolling of the foot, a tight calf muscle and Achilles tendon, and a sedentary lifestyle. Heel spurs may play a role; they are commonly present in people who have the condition. Plantar fasciitis is a disorder of the insertion site of the ligament on the bone characterized by micro tears, collagen breakdown, and scarring. Inflammation plays either a lesser or no role. A review proposed that the disorder be renamed plantar fasciosis. Presentation of symptoms is generally the basis for diagnosis. Conditions with similar symptoms include osteoarthritis, ankylosing spondylitis, heel pad syndrome, and reactive arthritis. Ultrasound can be useful in cases where the symptoms do not imply a diagnosis. Most cases resolve with time and conservative treatment. For the first few weeks, treatment involves rest, reduced activities, pain medications, and stretching. The next level involves physiotherapy, orthotics, splinting, or steroid injections.
== Prognosis == Prognosis depends on the individual form of muscular dystrophy. Some dystrophies cause progressive weakness and loss of muscle function, which may result in severe physical disability and a life-threatening deterioration of respiratory muscles or heart. Other dystrophies do not affect life expectancy and only cause relatively mild impairment.
=== The New 52 === In The New 52 continuity reboot, Major Force is a government agent working under Wade Eiling, with a special rank that allows him to represent all branches of the military. He seeks to protect Firestorm from villains and convince him to work for the government. However, Major Force comes to view Firestorm as a threat to national security and becomes his enemy. After helping out in a battle between Firestorm and several villains, Major Force knocks out Firestorm and takes him to Eiling. However, Superman confronts Major Force and Eiling and forces them to give Firestorm up. Major Force is implied to be the same character as Black Jack, an agent of the Black Razors who was introduced in Voodoo.
=== Inorganic hydroponic solutions === The formulation of hydroponic solutions is an application of plant nutrition, with nutrient deficiency symptoms mirroring those found in traditional soil based agriculture. However, the underlying chemistry of hydroponic solutions can differ from soil chemistry in many significant ways. Important differences include:
Sources: en.wikipedia.org
It is a 28-amino-acid peptide originally purified from a bovine thymic extract and later produced synthetically. It is studied mainly for its effects on immune cell function.
No. The two peptides share part of a name but differ in length, sequence, and net charge. Literature searches that treat them as one compound return misleading results.
Solid-phase peptide synthesis is the usual route, and recombinant expression has also been described. Both approaches produce material matching the natural sequence.
It is usually described as an immunomodulatory peptide rather than a classic circulating hormone. No endocrine gland is known to release it as a primary secretory product, and its measured presence in blood is not firmly established.