lyophilized powder comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-06-20. Numbers and descriptions here follow the published literature rather than marketing material.
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。
Identity and purity are usually checked by reverse-phase high-performance liquid chromatography, which separates the intact chain from truncated products, together with mass spectrometry for confirmation of the expected mass. Peptide mapping after enzymatic digestion and amino acid analysis add sequence-level evidence. Release testing also covers water content, residual solvents, and counter-ions, all of which influence measured mass and stability. Related-peptide limits are commonly expressed as a percentage of total peak area, with individual unspecified impurities held below a lower threshold.
The lyophilized peptide is a white to off-white powder that dissolves freely in water and in aqueous buffers near neutral pH. Because the molecule carries a net negative charge under physiological conditions, saline and phosphate solutions are the usual vehicles, while strongly acidic media are avoided. Stock solutions are commonly divided into small aliquots so that repeated freezing and thawing can be limited, since cycling may encourage aggregation. Solubility in organic solvents is poor and those solvents are seldom used as primary diluents.
Recommended storage for the dry powder is a freezer near minus twenty degrees Celsius, kept desiccated and away from light. Once dissolved, the peptide is less stable and is usually held at two to eight degrees Celsius for short intervals or frozen for longer storage. Stability studies focus on the acetylated terminus and the disulfide linkage because those features define the intact molecule. Common degradation routes include cysteine oxidation, deamidation of asparagine or glutamine side chains, and slow formation of higher-molecular-weight species.
| 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 |
=== Immunology === Simponi (golimumab) ($0.5 billion in 2024 revenues) is an immunosuppressive drug. Remicade (infliximab) ($0.1 billion in 2024 revenues) is a monoclonal antibody directed toward the cytokine TNF-alpha and used for the treatment of a wide range of autoimmune disorders, including rheumatoid arthritis, Crohn's disease, ankylosing spondylitis, plaque psoriasis, and others. Remicade and other TNF-alpha inhibitors exhibit additive therapeutic effects with methotrexate and improve quality of life. Adverse effects include increased risk of infection and certain cancers. Merck had rights to the drug in certain areas, while Janssen Biotech had rights in other areas; in 2017, Merck announced a biosimilar to Remicade, Renflexis.
==== Morphological plasticity in the supraoptic nucleus ==== Anatomical studies using electron microscopy have shown that the morphology of the supraoptic nucleus is remarkably adaptable. For example, during lactation there are large changes in the size and shape of the oxytocin neurons, in the numbers and types of synapses that these neurons receive, and in the structural relationships between neurons and glial cells in the nucleus. These changes arise during parturition, and are thought to be important adaptations that prepare the oxytocin neurons for a sustained high demand for oxytocin. Oxytocin is essential for milk let-down in response to suckling. These studies showed that the brain is much more "plastic" in its anatomy than previously recognized, and led to great interest in the interactions between glial cells and neurons in general.
=== Membership policy === WOSM's membership consists of its remaining founding member organizations and organizations recognized by WOSM as national scout organizations. WOSM's rules protect its founding and existing member organizations by permitting only one member organization in each country and locking-out all other Scout organizations from WOSM membership, recognition and participation no matter how worthy or large their membership. Several member organizations are federations, some with different component groups divided on the basis of religion (e.g., France and Denmark), ethnic identification (e.g., Israel) or language (e.g., Belgium). However, WOSM has never required an existing member organization to federate with other Scout organizations in the country, in order to make WOSM more inclusive and representative. There are numerous Canadian Scout organizations but only one is a WOSM member organization (the Canadian branch of one of the organizations that founded WOSM) which has a French language affiliate which is thereby recognized by WOSM. Other than this inherent limitation on WOSM membership, the basis for WOSM membership includes adherence to WOSM's aims and principles and independence from political involvement on the part of each member organization.
In 1990, Maroon et al. published the first microsurgical approach to far lateral disc herniations in the lumbar spine and in 2007, they published the case of Golfer's Stroke from Vertebral Artery Dissection. Further groundbreaking publications include the use of fish oil as an anti-inflammatory and alternative to nonsteroidal drugs for discogenic pain (2006); a unifying, immunoexcitotoxicity hypothesis for chronic traumatic encephalopathy (2011); and the possible use of a restricted calorie ketogenic diet for the treatment of glioblastoma multiforme (2013). In 2021, he began collaborating with Dr. Pravat Mandal on research utilizing magnetic resonance spectroscopy to assess glutathione deficiency—the brain's most abundant antioxidant—as a potential biomarker for the early diagnosis of Alzheimer's and Parkinson's diseases. In 2023, he was appointed to the board of directors of Syncromune, a biotechnology company developing novel immunotherapies that integrate cryosurgery and checkpoint inhibitor drugs for the treatment of solid tumors. In 2025, he and his colleagues received a research grant from the Chuck Noll Foundation to investigate glutathione deficiency in the brains of former National Football League (NFL) players and former Navy SEALs. Dr. Maroon is also an advocate for the use of hyperbaric oxygen therapy in the treatment of post-concussion syndrome, post-traumatic stress disorder (PTSD), long COVID, stroke, and spinal cord injury. He has authored several publications on these topics.
Nucleic acid was, partially, first discovered by Friedrich Miescher in 1869 at the University of Tübingen, Germany. He discovered a new substance, which he called nuclein and which - depending on how his results are interpreted in detail - can be seen in modern terms either as a nucleic acid-histone complex or as the actual nucleic acid. Phoebus Levene determined the basic structure of nucleic acids. In the early 1880s, Albrecht Kossel further purified the nucleid acid substance and discovered its highly acidic properties. He later also identified the nucleobases. In 1889 Richard Altmann created the term nucleic acid – at that time DNA and RNA were not differentiated. In 1938 Astbury and Bell published the first X-ray diffraction pattern of DNA. In 1944 the Avery–MacLeod–McCarty experiment showed that DNA is the carrier of genetic information and in 1953 Watson and Crick proposed the double-helix structure of DNA. Experimental studies of nucleic acids constitute a major part of modern biological and medical research, and form a foundation for genome and forensic science, and the biotechnology and pharmaceutical industries.
Sources: en.wikipedia.org
== Pathogenesis == The cells of adipose (fat) tissue synthesize hormones known as adipokines. In humans, dysfunction of adipose tissue, even in cases without obesity, has been associated with the development of insulin resistance, hypertension, systemic inflammation, and increased risk of blood clots (thrombosis). The inflammation produced by these hormones are thought to inflame adipose tissue, leading to the production of more adipokines and perpetuation of the cycle, and a constant low-level, pro-inflammatory state. Although it is suspected that a similar mechanism occurs in horses, further research is needed.
== Awards and honors == 2018 Elected fellow of the American Academy of Microbiology 2020 American Society for Microbiology Award for Research and Leadership in Clinical Microbiology Academy of Clinical Laboratory Physicians and Scientists Ellis S. Benson Award "40 Under 40" honoree by the American Society for Clinical Pathology
Simple FSL peptide synthesis – there is a reactive-functional-group FSL Kode construct with maleimide as its functional group which can be used for preparation of FSLs from cysteine-containing peptides, proteins or any other thiols of biological interest. The effective synthetic approach is based on the well-known Michael nucleophilic addition to maleimides (Fig. 7). Synthetic "Gylcolipids" – one family of the FSL constructs are synthetic glycolipids with well-defined hydrophobic tails and carbohydrate head groups
== Medical uses == As of January 2017, plecanatide is approved in the United States for the treatment of chronic idiopathic constipation in adults. later it was also approved for irritable bowel syndrome with constipation (IBS-C). The presence of this condition is determined using the Rome III diagnostic criteria for chronic constipation which requires that the patient meet stool frequency, stool consistency, incomplete evacuation, and straining requirements in addition to not being a likely candidate for irritable bowel syndrome. The symptoms should also have been present for at least three of the last six months to establish the chronic nature of the condition before treatment with plecanatide is indicated. Plecanatide has been shown to be safe and effective. It has shown to be at least equally as effective as its main competitor, linaclotide (brand name Linzess), but has been shown to have a lower rate of diarrhea as an adverse drug reaction.
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。
Reconstituted solutions are typically kept refrigerated at two to eight degrees Celsius when used within a short window, or frozen in aliquots for longer periods. Repeated freeze-thaw cycles are avoided because they can reduce recovery of intact peptide.