Everything below concerns prothymosin alpha. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-04-24. 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.
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 |
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Findings across trials are mixed; some report changes in selected immune markers, while others find no clear clinical benefit. Many studies are small and define outcomes differently, which limits comparison. Regulatory approval is confined to a few countries, and the compound is not an approved drug in the United States or most of Europe.
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.
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.
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.
Within the immune system, the peptide acts on several cell types rather than a single target. Reported activities include promotion of T-cell maturation, enhancement of natural killer cell activity, and modulation of cytokine production by dendritic cells and macrophages. Some of these effects appear to operate through toll-like receptor signaling, though the precise receptor-level mechanism remains debated. Whether the observed immune changes translate into clinical benefit is a separate question and depends on the indication studied.
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.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography, which separates the peptide from closely related impurities and from truncated or oxidized variants. Mass spectrometry supplies the molecular mass and confirms the expected sequence length, while amino acid analysis can be used to check composition. Because the molecule has no chromophore beyond the peptide backbone, ultraviolet detection is typically performed at a low wavelength, where baseline interference from solvents and buffers is a practical concern. Water content and counter-ion content are often reported alongside purity.
Practical handling focuses on limiting adsorption and contamination. The peptide dissolves readily in water, and dilute solutions tend to adhere to plastic and glass surfaces, so an inert carrier protein or a defined buffer can reduce losses in laboratory work. Workers also record the counter-ion form, since an acetate or trifluoroacetate salt changes the mass balance of the weighed powder. Documentation of lot number, purity value, and storage history supports reproducibility when results from different laboratories are compared.
== Presentation == People presenting with possible auricular hematoma often have additional injuries (for example, head/neck lacerations) due to the frequently traumatic causes of auricular hematoma. The ear itself is often tense, fluctuant, and tender with throbbing pain. However, because of potentially more remarkable injuries often associated with auricular hematoma, it can easily be overlooked without directed attention.
In the kinetic-molecular picture, a non-zero bulk viscosity arises in gases whenever there are non-negligible relaxational timescales governing the exchange of energy between the translational energy of molecules and their internal energy, e.g. rotational and vibrational. As such, the bulk viscosity is
Mark (1943), former U.S. ambassador to Burundi J. Owen Zurhellen, Jr. (1943), first U.S. ambassador to Suriname Christian H. Armbruster (1944), member of the New York State Assembly and the New York State Senate Harold Brown (1945), U.S. secretary of defense and president of the California Institute of Technology Albert Burstein (1947), Democratic Party politician and former Majority leader of the New Jersey General Assembly Edward N. Costikyan (1947), Democratic Party politician and reformer who oversaw the dismantling of Tammany Hall; partner at Paul, Weiss, Rifkind, Wharton & Garrison Gardiner L. Tucker (1947), former director of IBM Research and assistant secretary of defense for System Analysis, assistant secretary general of NATO Jonathan Dean (1948), U.S. representative for Mutual and Balanced Force Reductions negotiations 1979–1981 Roy H. McVicker (1948), U.S. congressman for Colorado's 2nd congressional district Monteagle Stearns (1948), former U.S. ambassador to Ivory Coast and U.S. ambassador to Greece Eugene Rossides (1949), lobbyist, football player drafted by the New York Giants in 1949, founder of the American Hellenic Institute, former U.S. assistant secretary of the treasury Donald A. Beattie (1951), assistant secretary for Conservation and Solar Applications in the United States Department of Energy and assistant administrator of the Energy Research and Development Administration Lawrence Pezzullo (1951), former U.S. ambassador to Uruguay, Nicaragua, and special envoy to Haiti; executive director of Catholic Relief Services 1983–1992 Eric M.
Pressure ulcer – Also known as decubitus ulcers or bedsores, this type of wound is a result of chronic pressure to the skin over a prolonged period. While most individuals have intact sensation and motor function which allow for frequent positional change to prevent the formation of such ulcers, older individuals are particularly susceptible to this type of chronic injury due to impaired neurosensory responses. Pressure ulcers can occur in as little as two hours of immobility in a bedridden patient or person who is otherwise unconscious/sedated (surgery, syncope, etc.). In the United States, pressure ulcers are graded using the National Pressure Injury Advisory Panel (NPIAP) system. In this system, ulcers are graded on wound depth with stage 1 being the least severe (erythema, intact skin) and stage 4 being full thickness damage through subcutaneous tissue down to muscle, tendon, or bone. Any ulcer that cannot be assessed due to overlying eschar is considered unstageable.
=== Dosage === Adult: Each tablet contains flupentixol 0.5 mg and melitracen 10 mg. The usual adult dose is one tablet in the morning and one at midday; in severe cases the morning dose may be increased to two tablets. The maximum recommended dose is four tablets per day. Elderly: The usual starting dose is one tablet in the morning; in severe cases, one tablet may also be given at midday.
Sources: en.wikipedia.org
== Genomes == The genome sequencing of the lactic acid bacterium L. plantarum WCFS1 shows more molecular details. The chromosome contains 3,308,274 base pairs (GenBank: AL935263.1). The GC content of L. plantarum is 44.45% with the average protein count 3063. According to the experiment from Wageningen Centre for Food Sciences, the rRNA number of L. plantarum WCFS1 is 15, and the number or tRNA is 70.
==== Cell culture using droplet-based microfluidics ==== Droplet-based microfluidic systems provide an analytic platform that enables the isolation of single cells or groups of cells in droplets. This tool offers high-throughput for cell experiments since droplet-based microfluidic systems can generate thousands of samples (droplets) per second. Compared with cell culture in conventional microtiter plates, microdroplets from μL to pL volumes reduce the use of reagents and cells. Additionally, automated handling and continuous processing allow assays to be carried out more efficiently. The isolated environment in an encapsulated droplet helps analyze each individual cell population. High-throughput cell culture experiments, for example, testing the behavior of bacteria, finding rare cell types, directed evolution, and cell screening are suitable for using the droplet-based microfluidic techniques.
Fatty acids are also components of the phospholipids that make up the bulk of the lipid bilayers of all cellular membranes. In plants, de novo fatty acid synthesis occurs in the plastids. Many seeds accumulate large reservoirs of seed oils to support germination and early growth of the seedling before it is a net photosynthetic organism. Mitochondrial fatty acid synthesis (mtFAS): Mitochondrial acetyl-CoA is converted to malonyl-CoA by the mitochondrial isoform of acetyl-CoA carboxylase 1 (mtACC1), in tandem with acyl-CoA synthetase family member 3 (ACSF3), which additionally generates malonyl-CoA from malonate, together providing the extender units for mitochondrial fatty acid synthesis (mtFAS). In response to mitochondrial acetyl-CoA availability, mtFAS builds acyl chains on the matrix-soluble acyl carrier protein (holo-ACP), producing acyl-ACP species with varying chain lengths. These acyl-ACP species are required for the biosynthesis of lipoic acid—a cofactor of key mitochondrial enzyme complexes such as the pyruvate dehydrogenase complex (PDC), the 2-oxoglutarate dehydrogenase complex (OGDC), the 2-oxoadipate dehydrogenase complex (OADHC), the branched-chain α-keto acid dehydrogenase complex (BCKDHC), and the glycine cleavage system—as well as for the allosteric activation of the LYRM protein network. Members of this network regulate iron–sulfur cluster biogenesis, assembly of the electron transport chain complexes, and mitochondrial translation, which remains active even under conditions of limited acetyl-CoA availability.
In order to strengthen security and stability in Iraq, and thereby contribute to international peace and stability, and to enhance the ability of the Republic of Iraq to deter all threats against its sovereignty, security, and territorial integrity, the Parties shall continue to foster close cooperation concerning defense and security arrangements without prejudice to Iraqi sovereignty over its land, sea, and air territory.
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。