If you have been reading about Immunomodulatory peptide and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-11-21. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
在信号层面，Tα1可能通过Toll样受体等模式识别受体发挥作用。部分实验显示，它能激活髓样分化因子88依赖的通路，进而促进核因子κB进入细胞核。这导致白细胞介素2、干扰素γ和白细胞介素12等细胞因子的转录增加。这些细胞因子偏向辅助性T细胞1型应答，有助于细胞免疫。然而，具体受体和结合位点尚未完全确定，不同实验模型的结果存在差异。
临床研究将Tα1用于慢性病毒感染、肿瘤辅助治疗和疫苗佐剂等场景。部分试验报告了免疫学指标改善，但临床终点获益在不同研究中并不一致。系统综述指出，研究间在人群、剂量和联合方案上差异较大，难以汇总结论。因此，Tα1的确切临床地位仍属开放问题，需要更多高质量随机对照试验来澄清。其机制研究也需从体外实验向体内模型推进。
胸腺素α1对免疫系统的影响涉及多种细胞类型。研究表明，它可促进未成熟T细胞向成熟T细胞分化，并增强T细胞对抗原刺激的增殖反应。树突状细胞在Tα1存在下表达更高水平的共刺激分子，从而更有效地呈递抗原。此外，自然杀伤细胞的活性也观察到上升。这些效应并非直接杀伤病原体，而是调节宿主免疫应答的强度与方向。
| Property | Value | Notes |
|---|---|---|
| Molecular mass | ≈3,108 Da | Synthetic 28-residue peptide |
| Amino acid count | 28 | N-terminal serine carries an acetyl group |
| Appearance | White to off-white powder | Lyophilized solid |
| Water solubility | Freely soluble | Dissolves in aqueous buffer |
| Common synonyms | Thymalfasin; Tα1 | Thymalfasin is the international nonproprietary name |
Overall evidence quality varies considerably. A large share of published reports come from single centers, rely on surrogate immunological markers, or lack adequate control groups. Systematic reviews have highlighted this heterogeneity as a barrier to pooling results. Open questions include which patients, if any, might benefit, what treatment duration is appropriate, and whether any effect is independent of standard care. The peptide is often described as an immune modulator rather than a therapy for one disease, which complicates confirmatory trial design.
Thymosin alpha 1 was identified in 1977 as a component of thymosin fraction 5, a heterogeneous preparation used in early studies of thymic function. Investigators purified the active material and determined its amino acid sequence, which enabled chemical synthesis. Work in the following decades concentrated on T-cell maturation and immune reconstitution in animals and small human cohorts. Early preparations varied in composition, so results from that period are difficult to compare with studies using defined synthetic peptide.
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.
The peptide was described in the 1970s as a component of thymic extracts, and early research focused on restoring immune function in immunodeficiency states. A synthetic version entered clinical development in the 1980s and is approved as a drug in several countries for conditions such as chronic hepatitis B and certain immunodeficiencies. Approval status varies widely by jurisdiction, and in the United States it is not an approved therapeutic. Regulatory and clinical positions differ, so statements about efficacy should be tied to specific indications and studies.
Thymosin alpha-1 is a synthetic peptide of 28 amino acids, corresponding to the N-terminal fragment of prothymosin alpha. Its sequence begins with acetylation at the N-terminus, a modification that affects stability and receptor interaction. The peptide is acidic, with a calculated isoelectric point near 4.2, and carries no disulfide bonds, so its secondary structure is largely flexible in solution. Molecular mass is approximately 3108 daltons. The native form was first isolated from bovine thymus tissue, while pharmaceutical material is produced by solid-phase peptide synthesis.
== Structure == Similar to G protein-coupled receptors (GPCRs), AdipoR1 also possesses 7 transmembrane domains. However, AdipoR1 is orientated oppositely to GPCRs in the membrane (i.e., cytoplasmic N-terminus, extracellular C-terminus) and does not associate with G proteins.
Flap is a surgical technique in plastic and reconstructive surgery where a bulk of tissue with an intact blood supply is lifted (mobilized) from the original (donor) site and moved to a new (recipient) site. Flaps are distinct from grafts, which are autotransplantations that do not come with an intact blood supply and rely on the growth of new blood vessels (neovascularization) to stay viable.
==== Slow-tight ==== Slow-tight inhibition occurs when the initial enzyme–inhibitor complex EI undergoes conformational isomerism (a change in shape) to a second more tightly held complex, EI*, but the overall inhibition process is reversible. This manifests itself as slowly increasing enzyme inhibition. Under these conditions, traditional Michaelis–Menten kinetics give a false value for Ki, which is time–dependent. The true value of Ki can be obtained through more complex analysis of the on (kon) and off (koff) rate constants for inhibitor association with kinetics similar to irreversible inhibition.
One theory on the evolutionary and biological origins of autism traits in Homo sapiens that has gained recent attention in the 2010s and 2020s is that some genes linked to autism may have originated from early humans crossbreeding with Neanderthals, an extinct group of archaic humans (generally regarded as a distinct species, Homo neanderthalensis, though some regard it as a subspecies of Homo sapiens, referred to as H. sapiens ssp. neanderthalensis) who lived in Eurasia until about 40,000 years ago. A possible link between autism spectrum disorders (ASDs) and Neanderthal DNA was identified in 2009, pending genome sequencing. The first Neanderthal genome sequence was published in 2010, and strongly indicated interbreeding between Neanderthals and early modern humans. The genomes of all studied modern populations contain Neanderthal DNA. Various estimates exist for the proportion, such as 1–4% or 3.4–7.9% in modern Eurasians, or 1.8–2.4% in modern Europeans and 2.3–2.6% in modern East Asians. Pre-agricultural Europeans appear to have had similar, or slightly higher, percentages to modern East Asians, and the numbers may have decreased in the former due to dilution with a group of people which had split off before Neanderthal introgression.
Sources: en.wikipedia.org
The new understanding of benzene, and hence of all aromatic compounds, proved to be so important for both pure and applied chemistry that in 1890 the German Chemical Society organized an elaborate appreciation in Kekulé's honor, celebrating the twenty-fifth anniversary of his first benzene paper. Here Kekulé spoke of the creation of the theory. He said that he had discovered the ring shape of the benzene molecule after having a reverie or day-dream of a snake biting its own tail (a symbol in ancient cultures known as the ouroboros). This vision, he said, came to him after years of studying the nature of carbon-carbon bonds. This was seven years after he had solved the problem of how carbon atoms could bond to up to four other atoms at the same time. Curiously, a similar, humorous depiction of benzene had appeared in 1886 in a pamphlet entitled Berichte der Durstigen Chemischen Gesellschaft (Journal of the Thirsty Chemical Society), a parody of the Berichte der Deutschen Chemischen Gesellschaft, only the parody had monkeys seizing each other in a circle, rather than snakes as in Kekulé's anecdote. Some historians have suggested that the parody was a lampoon of the snake anecdote, possibly already well known through oral transmission even if it had not yet appeared in print. Kekulé's 1890 speech in which this anecdote appeared has been translated into English. If the anecdote is the memory of a real event, circumstances mentioned in the story suggest that it must have happened early in 1862.
== Education == Lin received her BS in chemistry from National Taiwan University in 2004. Lin received her PhD in chemistry in 2009 from University of Wisconsin, Madison, under the guidance of James L. Skinner. She then moved to Stanford, where she was a Bio-X postdoctoral fellow in the lab of Vijay S. Pande. In 2012, Lin joined the Department of Chemistry at Tufts University and received tenure in 2018. In 2024, Lin was appointed to a full professorship and became chair of the department.
=== Other === Other bodily fluids and organs may provide samples, particularly samples collected during an autopsy. A common autopsy sample is the gastric contents of the deceased, which can be useful for detecting undigested pills or liquids that were ingested prior to death. In highly decomposed bodies, traditional samples may no longer be available. The vitreous humour from the eye may be used, as the fibrous layer of the eyeball and the eye socket of the skull protects the sample from trauma and adulteration. Other common organs used for toxicology are the brain, liver, and spleen.
Bibudhendra Sarkar (born August 2, 1935), commonly known as Amu Sarkar, is an Indian-born Canadian biochemist known for his research on copper-histidine therapy in human blood, which led to one of the first effective treatments for Menkes disease. From 1990 to 2002, he served as head of the Division of Biochemistry Research at the Hospital for Sick Children Research Institute in Toronto. During his tenure, he founded the institute's Department of Structural Biology Research in 1990.
=== Inflammation === FFAR2 is expressed in various cells involved in the development of inflammatory responses such as neutrophils, monocytes, macrophages, dendritic cells, regulatory T cells, and T helper cells. FFAR2 often appears to be involved in suppressing these cells' pro-inflammatory actions and thereby the development of inflammation. For example: 1) compared to control mice, Ffar2 gene knockout mice developed more severe and unresolving inflammation in colitis, arthritis, peritonitis, and asthma models of inflammation; 2) germ-free mice, which lack intestinal SCFAs, likewise had severer disease in these colitis, arthritis, and asthma models; 3) in a dextran sulphate sodium-induced model of colitis, Ffar2 gene knockout mice developed more severe disease than control mice; 4) two studies found that normal mice but not Ffar2 gene knockout mice fed a prebiotic diet that produces higher intestinal levels of SCFAs were protected from developing allergic responses to food; 5) the latter study also showed that the prebiotic diet was fully protective in Ffar3 gene knockout mice (allergic responses are a subtype of the inflammatory reactions); and 6) studies in mice and humans suggest that FFAR2 is involved in suppressing the pancreatic islet inflammation underlying the development of type 1 diabetes (see previous section). Other studies, however, have reported that FFAR2 promotes inflammation. Two studies found that FFAR2 gene knockdown mice had less severe disease in a dextran sulphate sodium-induce colitis model compared to control mice.
Sources: en.wikipedia.org
== Alternatives == In 2018 road transport used 49% of petroleum, aviation 8%, and uses other than energy 17%. Electric vehicles are the main alternative for road transport and biojet for aviation. Single-use plastics have a high carbon footprint and may pollute the sea, but as of 2022 the best alternatives are unclear.
=== Obesity-related metabolic disorders === CK1δ may affect metabolic dysfunction especially in obese situation by improving glucose tolerance, decreasing gluconeogenesis gene expression and glucose secretion or increasing basal and insulin-stimulated glucose uptake. Furthermore, formation of the biologically active higher molecular weight (HMW) form of adiponectin, which is involved in regulating glucose levels and fatty acid secreted from adipose tissue, is modulated by site-specific phosphorylation of adiponectin by CK1δ.
== Terminology == Lactose intolerance primarily refers to a syndrome with one or more symptoms upon the consumption of food substances containing lactose sugar. Individuals may be lactose intolerant to varying degrees, depending on the severity of these symptoms. Hypolactasia is the term specifically for the small intestine producing little or no lactase enzyme. If a person with hypolactasia consumes lactose sugar, it results in lactose malabsorption. The digestive system is unable to process the lactose sugar, and the unprocessed sugars in the gut produce the symptoms of lactose intolerance. Lactose intolerance is not an allergy, because it is not an immune response, but rather a sensitivity to dairy caused by a deficiency of lactase enzyme. Milk allergy, occurring in about 2% of the population, is a separate condition, with distinct symptoms that occur when the presence of milk protein, whey, triggers an immune reaction. A milk allergy most often appears in the first year of life, while lactose intolerance typically appears later in life. Lauren Ornelas, the founder of Food Empowerment Project, has coined the term lactose normal to replace lactose intolerance, as the latter term suggests that there is something abnormal or medically pathological about it, and originated in a context of cultural bias and failure to recognize the fact that most weaned humans are unable to digest lactose. Some have expressed preference for the term lactose normal.
Mysore State, colloquially Old Mysore, was a political territory within the Dominion of India and the subsequent Republic of India from 1950 until 1956. The state was formed by renaming the Kingdom of Mysore, with Bangalore replacing Mysore as the state's capital when Parliament passed the States Reorganisation Act in 1956. Mysore State was considerably enlarged when it became a linguistically homogeneous Kannada-speaking state within the Republic of India by incorporating territories from Andhra, Bombay, Coorg, Hyderabad, and Madras States, as well as other petty fiefdoms. It was subsequently renamed Karnataka in 1973.
Sources: en.wikipedia.org
It is a chain of 28 amino acids, with an acetyl group attached to the first serine residue. The synthetic version replicates this sequence. Its molecular mass is about 3,108 daltons.
It is usually described as an immunomodulatory peptide rather than a classic hormone. It acts on immune cells through receptor pathways. No single endocrine organ target defines its function.
Several countries, including Italy and China, allow it for specific indications. The FDA has not approved it as a drug in the United States. Availability depends on local regulation.
它促进未成熟T细胞分化并增强成熟T细胞的增殖与细胞因子分泌。这些作用有助于放大抗原特异性免疫应答。