Everything below concerns 免疫调节. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-25. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Several factors accelerate degradation: alkaline pH, elevated temperature, exposure to oxidants, and the presence of residual moisture. Deamidation of asparagine residues and oxidation of methionine are the most commonly reported degradation routes. Because the peptide lacks disulfide bonds, it does not undergo the thiol-related aggregation seen in some other biologics, but physical aggregation can still occur at high concentration. Stability data are product-specific, and extrapolating shelf life between formulations is not reliable.
Lyophilized thymosin alpha-1 is generally stored at or below minus twenty degrees Celsius, protected from moisture and light. Short-term handling at ambient temperature is possible for dry powder, but reconstituted solutions degrade faster and are usually kept at two to eight degrees Celsius with a defined expiry of days rather than weeks. Repeated freeze-thaw cycles should be avoided because they promote aggregation and loss of potency. Exact limits depend on the formulation and should follow the supplier's documentation.
Identity and purity are normally assessed by reversed-phase high-performance liquid chromatography, which separates the peptide from related impurities and truncation products. Mass spectrometry confirms molecular mass and detects modifications such as deamidation or oxidation. Amino acid analysis and peptide mapping provide additional sequence-level confirmation. For research material, a certificate of analysis typically reports these results together with water content and counter-ion identity, since the lyophilized powder is often supplied as an acetate or trifluoroacetate salt.
| 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 |
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。
The activity of this peptide is generally described as immunomodulatory rather than directly antimicrobial. Experimental work links it to signaling through certain Toll-like receptors on dendritic cells and to downstream maturation of antigen-presenting cells. Reported effects include expansion of T cell subsets, shifts in cytokine profiles, and increased natural killer cell activity. These observations come largely from cell culture and animal models, and the precise receptor-level events in humans remain incompletely characterized.
The compound has been investigated as an adjunct in chronic viral hepatitis and as a vaccine adjuvant, with results that vary by study design and population. Regulators in some countries have approved a synthetic form for specific indications, while other agencies have not. Whether the peptide produces consistent clinical benefit across diverse patient groups is still an open question, and many trials have been small. Its status is therefore best described as investigational in many contexts and established only narrowly.
The name itself causes confusion, because several unrelated thymic peptides share the thymosin label. Thymosin beta-4, for example, is a different molecule with different functions. Naming conventions in the literature also mix descriptive research terms with assigned nonproprietary names, so a reader should confirm which entity a given paper addresses. Clarifying that point is usually the first step in interpreting any claim about this peptide.
are convenient for the patients who have difficulty in swallowing (children, old people, bed-ridden and psychiatric patients); are fast to absorb; don't require water to consume; have good taste (mouth feel); don't provoke choking or suffocation; have high microbial resistance ("due to the low moisture content in the final product, the Zydis formulation does not allow microbial growth").
A statistical analysis plan is a document that contains a more technical and detailed elaboration of the principal features of the analysis described in the protocol, and includes detailed procedures for executing the statistical analysis of the primary and secondary variables and other data. (ICH E9) Statistical significance
=== Thyroid function === One review noted that soy-based foods may inhibit absorption of thyroid hormone medications required for treatment of hypothyroidism. A 2015 scientific review by the European Food Safety Authority concluded that intake of isoflavones from supplements did not affect thyroid hormone levels in postmenopausal women.
backbone Also main chain. The primary or most structurally significant portion of a molecule with respect to its other parts, functional groups, moieties, or substituents; or, in the case of a polymer, that linear chain of atoms to which all other chains, long or short or both, may be regarded as being pendant or as side chains. Where two or more chains might equally be considered the backbone, the one which permits the simplest representation of the molecule in chemical formulae and nomenclature is considered the backbone.
== Discovery == Several of the components and reactions of the citric acid cycle were established in the 1930s by the research of Albert Szent-Györgyi, who received the Nobel Prize in Physiology or Medicine in 1937 specifically for his discoveries pertaining to fumaric acid, a component of the cycle. He made this discovery by studying pigeon breast muscle. Because this tissue maintains its oxidative capacity well after breaking down in the Latapie mincer and releasing in aqueous solutions, breast muscle of the pigeon was very well qualified for the study of oxidative reactions. The citric acid cycle itself was finally identified in 1937 by Hans Adolf Krebs and William Arthur Johnson while at the University of Sheffield, for which the former received the Nobel Prize for Physiology or Medicine in 1953, and for whom the cycle is sometimes named the "Krebs cycle". Independently citric acid cycle was identified in 1937 by German biochemists Carl Martius and Franz Knoop.
Sources: en.wikipedia.org
An important piece information gained by ion mobility are the collision cross sections (CCS). These rotationally averaged 2D-projections of the molecule, providing an insight in the global shape. In proteomics, these can be used to gain insights in the stability of protein and multi-protein complexes via collision induced dissociation (CID) experiments. While in metabolomics and glycomics, the CCS can, when coupled to mass spectrometry (MS), be used to separate isomers of the same compound. This way, adding CCS values of glycans and their fragments to databases will increase structural identification confidence and accuracy. In addition to the empirical determination, CCS values can be computationally calculated if the 3D-structure of the molecule is known. Current CCS algorithms allow ms calculation times, making them very powerful when combined with AlphaFold and/or molecular dynamic simulations. Outside of laboratory purposes, IMS has found great usage as a detection tool for hazardous substances. More than 10,000 IMS devices are in use worldwide in airports, and the US Army has more than 50,000 IMS devices. In industrial settings, uses of IMS include checking equipment cleanliness and detecting emission contents, such as determining the amount of hydrochloric and hydrofluoric acid in a stack gas from a process. It is also applied in industrial purposes to detect harmful substances in air.
Households comprising couples with or without children make up 51 percent of all households; 8.7 percent of households are single-parent households, 2.9 percent are multigenerational households, and 29.3 percent are single-person households.
It is one of the few hallucinogens legally available in the United States for religious purposes by the Native American Church. Salvia divinorum: This hallucinogenic Mexican herb in the mint family; not considered recreational, most likely due to the nature of the hallucinations (legal in some jurisdictions) Synthetic cannabis: "Spice", "K2", JWH-018, AM-2201 Quaaludes: A popular club drug in the 1970s. No longer prescribed or manufactured in many countries but remains popular in South Africa.
== Awards and honors == Agnes Fay Morgan Research Award, Iota Sigma Pi, 2019 Marshall University College of Science Distinguished Alumni Award, 2019 Eli Lilly Young Investigator Award in Analytical Chemistry, 2018 US HUPO Robert J. Cotter New Investigator Award, 2018 NSF CAREER Award, 2015 Arthur C. Neish Young Investigator Award, 2014 NSF Graduate Research Fellowship, 2002-2005
=== Brown === The brown color that UPS uses on its vehicles and uniforms is called Pullman brown. Company founder James E. Casey originally wanted company vehicles to use a yellow paint scheme, but one of his partners, Charlie Soderstrom, stated that a yellow vehicle would be hard to keep clean and that Pullman railroad cars were brown for just that reason. During the 2000s, the company used the familiarity of its color scheme in an advertising slogan: "What can Brown do for you?"
Sources: en.wikipedia.org
This relative stability was consolidated with the oil expropriation carried out in 1938, which universally raised Cárdenas' popularity. The United States, seeing Mexico's stability, decided not to retaliate following the expropriation and reached a compensation agreement as part of the Good Neighbor policy, which would help establish post-war Pan-American cooperation.
== Collaborative research == In addition to internal research and development activities F. Hoffmann-La Roche is also involved in publicly funded collaborative research projects, with other industrial and academic partners. One example in the area of non-clinical safety assessment is the InnoMed PredTox. The company is expanding its activities in joint research projects within the framework of the Innovative Medicines Initiative of the European Federation of Pharmaceutical Industries and Associations and the European Commission.
=== Alcohols === Alcohols generally have weak molecular ion peaks due to the strong electronegativity of oxygen. “Alpha” cleavage is common due to the resonance stabilization. The largest alkyl group will be lost.
A sterile needle and sterile syringe must be used for each vial for adding the diluent to the powder in a single vial or ampoule of freeze-dried vaccine. The only way to be completely safe from exposure to blood-borne diseases from injections, particularly hepatitis B virus (HBV), hepatitis C virus (HCV), and human immunodeficiency virus (HIV) is to use one sterile needle, one sterile syringe for each child.
A motor unit that rotates the evaporation flask or vial containing the user's sample. A vapor duct that is the axis for sample rotation, and is a vacuum-tight conduit for the vapor being drawn off the sample. A vacuum system, to substantially reduce the pressure within the evaporator system. A heated fluid bath (generally water) to heat the sample. A condenser with either a coil passing coolant, or a "cold finger" into which coolant mixtures such as dry ice and acetone are placed. A condensate-collecting flask at the bottom of the condenser, to catch the distilling solvent after it re-condenses. A mechanical or motorized mechanism to quickly lift the evaporation flask from the heating bath. The vacuum system used with rotary evaporators can be as simple as a water aspirator with a trap immersed in a cold bath (for non-toxic solvents), or as complex as a regulated mechanical vacuum pump with refrigerated trap. Glassware used in the vapor stream and condenser can be simple or complex, depending upon the goals of the evaporation, and any propensities the dissolved compounds might give to the mixture (e.g., to foam or "bump"). Commercial instruments are available that include the basic features, and various traps are manufactured to insert between the evaporation flask and the vapor duct. Modern equipment often adds features such as digital control of vacuum, digital display of temperature and rotational speed, and vapor temperature sensing.
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.
Dry lyophilized powder tolerates short ambient exposure during handling and shipping. Long-term room-temperature storage is not recommended because moisture uptake and slow degradation can occur over months. Storage at minus twenty degrees Celsius is the common practice for extended periods.