immunomodulatory peptide is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-06-26. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
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。
The molecule consists of 28 amino acid residues with an acetyl group attached to the N-terminal serine. Its sequence is acidic overall, with several glutamic and aspartic acid residues distributed along the chain and no cysteine, so disulfide bridges do not form. The peptide carries a net negative charge at physiological pH. Because the N-terminus is blocked, the intact molecule resists degradation by many aminopeptidases, which contributes to its stability in biological fluids.
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.
| 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 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.
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.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
Thymosin alpha-1 is a 28-residue peptide first isolated from thymus tissue in the 1970s. It corresponds to the N-terminal portion of thymosin beta-4, from which it is cleaved in vivo. The peptide carries an acetyl group at its N-terminus, a modification that affects its charge and stability. Synthetic material produced by solid-phase peptide synthesis is chemically identical to the natural fragment and is the form used in research and clinical studies.
In particular, Jung argued that dreams are best used in analysis with the methods of amplification and active imagination, rather than by interpretation through free association (as Freud proposed). Jung saw dreams as serving individuation by making unconscious material available to the whole personality. Jung originated the idea of therapy as a dialectical process - a two-way process where both parties are equally involved. He saw it was important to see the patient as a real person rather than a sick inferior. In this way, he also saw himself as not having all the answers and saw the process of a patient finding their own answers as much more valuable. He made a point of not being dogmatic in his approach and treating each patient as the individual they are. As such, he disregarded group therapies. Jung saw analysis as having four stages:
Pennington's involvement with refrigerated boxcar design at the Food Research Laboratory led to an interest in the entire process of transporting and storing perishable food, including both refrigerated transport and home refrigeration. During her time with the laboratory, Pennington and Howard Castner Pierce were awarded a U.S. patent for an all-metal poultry-cooling rack for the cooling and grading of poultry, rabbits, and game. In 1919, Pennington accepted a position with a private firm, American Balsa, which manufactured insulation for refrigeration units. She left the firm in 1922 to start her own consulting business, which she ran until her retirement in 1952. She founded the Household Refrigeration Bureau in 1923 to educate consumers in safe practices in domestic refrigeration. Much of her work in the 1920s was supported by the National Association of Ice Industries (NAII), an association of independent icemakers and distributors who delivered ice to the home for use in iceboxes, before the widespread availability of electric refrigerators. With NAII support, she published pamphlets on home food safety, including The Care of the Child's Food in the Home (1925) and Cold is the Absence of Heat (1927).
== Chemistry == DET, also known as N,N-diethyltryptamine, is a synthetic compound in the tryptamine class, structurally related to the endogenous neurotransmitter serotonin and the naturally occurring psychedelic compounds dimethyltryptamine (DMT) and dipropyltryptamine (DPT). It is the ethyl analogue of DMT.
The surgeon measures the dimensions (length, width, depth) of the nasal wound, and then delineates them upon the nasal septum, and, if possible, incorporates an additional margin of 3–5 mm of width to the wound measurements; furthermore, the base of the mucosal tissue flap should be at least 1.5-cm wide. The surgeon then makes two parallel incisions along the floor and the roof of the nasal septum; the incisions converge anteriorly, towards the front of the nasal spine. Using an elevator, the flap is dissected in a sub-mucoperichondrial plane. The (far) distal edge of the flap is cut with a right-angle Beaver blade, and then is transposed into the wound. The exposed cartilages will reepithelialise (regenerate the epithelium), provided the opposite (contralateral) side of the septal mucosa is undisturbed. A technical variant of the septal mucosal flap technique is the trap-door flap, which is used to reconstruct one side of the upper half of the nasal lining. It is emplaced in the contralateral nasal cavity, as a superiorly based septal mucosal flap of rectangular shape, like that of a "trap-door". This septomucosal flap variant is a random flap with its pedicle based at the junction of the septum and the lateral nasal skeleton. The surgeon elevates the flap of septal mucosa to the roof of the nasal septum, and then traverses it into the contralateral (opposite) nasal cavity through a slit made by removing a small, narrow portion of the dorsal roof of the septum. Afterwards, the septomucosal flap is stretched across the wound in the mucosal lining of the lateral nose.
Sources: en.wikipedia.org
=== Vegetarian HDR and MARC === The Humanitarian Daily Ration (HDR) is a self-contained Halal meal designed to be given to refugees and other displaced people. It is designed to feed a person for a full day, and the menus are intended to be palatable to many religious and cultural tastes. To meet this goal, no animal products or by-products, no alcohol or alcohol-based products, and minimal dairy products are used in their production. It is otherwise created and packaged much like MREs; feedback from the Afghanistan campaign led to the interior packing being reinforced to withstand being air-dropped, as the packets sometimes ruptured on impact. The outer bag is tinted a high-visibility red or yellow and has an American flag and a picture of a person eating out of the bag with a spoon. There are usually instructions printed on it in English and one or more local languages as well. The Meal, Alternative Regionally Customized (MARC) is a self-contained, shelf-stable meal developed by U.S. Army Soldier and Biological Chemical Command (SBCCOM)/Natick, Individual Combat Ration Team (ICRT), Combat Feeding Directorate (CFD). MARCs were developed specifically for detainees at Guantanamo Bay, and have since found wider spread use, notably Iraq and Afghanistan. MARC meals are entirely vegetarian as an easy way to prevent conflicts with culturally "prohibited products" (Islam and Judaism forbidding pork, Hindus avoiding beef, etc). They are neither Kosher nor Halal certified.
The measurement of molar mass by vapour density relies on the principle, first enunciated by Amedeo Avogadro, that equal volumes of gases under identical conditions contain equal numbers of particles. This principle is included in the ideal gas equation:
=== Awards and honours === Williams was appointed Member of the Order of the British Empire (MBE) in the 2010 New Year Honours for services to the community in North Oxford. He was elected a Fellow of the Royal Society (FRS) in 1972 and was a Foreign Member of the Swedish, Portuguese, Czechoslovak and Belgian science academies. He was a medallist of the Biochemical Society (twice), the Royal Society (twice), the Royal Society of Chemistry (three times), the Federation of European Biochemical Societies (twice) and the International Union of Biochemistry. He delivered the Bakerian Lecture in 1981 and won the Royal Medal in 1995.
=== Political views and activities === Because of Hodgkin's political activities, and her husband's association with the Communist Party, she was banned from entering the US in 1953 and subsequently not allowed to visit the country except by CIA waiver. In 1961 Thomas became an advisor to Kwame Nkrumah, President of Ghana, a country he visited for extended periods before Nkrumah's ouster in 1966. Hodgkin was in Ghana with her husband when they received the news that she had been awarded the Nobel Prize. She acquired from her mother, Molly, a concern about social inequalities and a determination to do what she could to prevent armed conflict. Dorothy became particularly concerned about the threat of nuclear war. In 1976, she became president of the Pugwash Conference and served longer than any who preceded or succeeded her in this post. She stepped down in 1988, the year after the Intermediate-Range Nuclear Forces Treaty imposed "a global ban on short- and long-range nuclear weapons systems, as well as an intrusive verification regime". She accepted the Lenin Peace Prize from the Soviet government in 1987 in recognition of her work for peace and disarmament.
==== Psychosis ==== Isotretinoin has also been linked to psychosis. Many of the side effects of isotretinoin mimic hypervitaminosis A, which has been associated with psychotic symptoms. The dopamine hypothesis of schizophrenia and psychosis suggests that an increase in dopaminergic stimulation or sensitivity in the limbic system causes psychotic symptoms. It has been suggested that dysregulation of retinoid receptors by retinoids such as isotretinoin may cause schizophrenia. The evidence for this is threefold: transcriptional activation of the dopamine D2 receptor – in addition to serotonin and glutamate receptors – is regulated by retinoic acid; schizophrenia and the retinoid cascade have been linked to the same gene loci; and retinoid dysfunction causes congenital anomalies identical to those observed in people with schizophrenia. Further, the expression of dopamine receptors has indeed been shown to be regulated by retinoic acid.
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。
Thymosin fraction 5 is a mixture of many peptides obtained from thymus tissue, while thymosin alpha 1 is a single defined 28-residue molecule. The two names appear together in older literature because the purified peptide was first obtained from that mixture.