The short version of prothymosin alpha fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-07-11 and is reviewed periodically as new material appears.
Thymosin alpha 1 is a short peptide of 28 amino acid residues that derives from the amino terminal region of a larger precursor protein known as prothymosin alpha. The peptide carries an acetyl group on its first residue and contains no disulfide bonds or carbohydrate chains. Its sequence is highly conserved across mammalian species, which is one reason laboratories treat it as a molecule with a defined and reproducible structure rather than a variable tissue extract. The name follows an early naming convention for thymus-derived fractions and does not imply that the peptide acts as a hormone in the classical endocrine sense.
Biologically, the peptide is studied mainly in the context of immune cell development and regulation. It is produced in the thymus and in several other tissues, and it appears to influence the maturation and activity of T cells and other immune populations. Laboratory work describes effects on cytokine production, on the balance between T cell subsets, and on the function of dendritic cells. Much of this evidence comes from cell culture and animal models, so the extent to which the same pathways operate in humans remains an open question.
Clinical interest has centered on chronic viral hepatitis, on immune restoration in various conditions, and on use as an adjuvant intended to improve responses to vaccines. Trials have reported mixed results, and regulatory status differs sharply between countries; in some places it is a prescription product, while elsewhere it is sold without an approved therapeutic indication. Because published studies vary widely in design, population, and endpoints, comparisons across them are difficult and no single conclusion covers the whole literature.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular mass | Approximately 3,108 Da | Consistent with a 28-residue acetylated peptide |
| Residue count | 28 | Corresponds to the amino terminal region of prothymosin alpha |
| Appearance of dry powder | White to off-white solid | Slight variation between lots is normal |
| Solubility class | Freely soluble in water | Low solubility in most organic solvents |
| Common synonyms | Thymosin alpha 1, T alpha 1 | The numeral reflects an early fraction numbering scheme |
=== Compound class characterization === GC-VUV can be used for bulk compositional analysis because compounds share spectral shape characteristics within a class. Proprietary software applies fitting procedures to quickly determine the relative contribution of each compound category present in a sample. Retention index information is used to limit the amount of VUV library searching and fitting performed for each analyte, enabling the automated data processing routine to be completed quickly. Compound class or specific compound concentrations can be reported as either mass or volume percent. GC-VUV bulk compound characterization was first applied to the analysis of paraffin, isoparaffin, olefin, naphthene, and aromatic (PIONA) hydrocarbons in gasoline streams. It is suitable for use with finished gasoline, reformate, reformer feed, FCC, light naphtha, and heavy naphtha samples. A typical chromatographic analysis is displayed in Figure 7. The inset shows how the analyte spectral response is fit with VUV library spectra for the selected time slice. A report detailing the carbon number breakdown within each PIONA compound class, as well as the relative mass or volume percent of classes, is shown. A table with mass % and carbon number data from a gasoline sample can be seen in Figure 8. Compound class characterization utilizes a method known as time interval deconvolution (TID), which has recently been applied to the analysis of terpenes.
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The Classification of Pharmaco-Therapeutic Referrals helps guide the referral process between pharmacists and doctors. The International Narcotics Control Board of the United Nations imposes a world law of prohibition of certain drugs. They publish a lengthy list of chemicals and plants whose trade and consumption (where applicable) are forbidden. OTC drugs are sold without restriction as they are considered safe enough that most people will not hurt themselves accidentally by taking it as instructed. Many countries, such as the United Kingdom have a third category of "pharmacy medicines", which can be sold only in registered pharmacies by or under the supervision of a pharmacist. Medical errors include over-prescription and polypharmacy, mis-prescription, contraindication and lack of detail in dosage and administration instructions. In 2000 the definition of a prescription error was studied using a Delphi method conference; the conference was motivated by ambiguity in what a prescription error is and a need to use a uniform definition in studies.
Sources: en.wikipedia.org
The unit cell of these phases has double Bi–O planes which are stacked in a way that the Bi atom of one plane sits below the oxygen atom of the next consecutive plane. The Ca atom forms a layer within the interior of the CuO2 layers in both Bi-2212 and Bi-2223; there is no Ca layer in the Bi-2201 phase. The three phases differ with each other in the number of cuprate planes; Bi-2201, Bi-2212 and Bi-2223 phases have one, two and three CuO2 planes, respectively. The c axis lattice constants of these phases increases with the number of cuprate planes (see table below). The coordination of the Cu atom is different in the three phases. The Cu atom forms an octahedral coordination with respect to oxygen atoms in the 2201 phase, whereas in 2212, the Cu atom is surrounded by five oxygen atoms in a pyramidal arrangement. In the 2223 structure, Cu has two coordinations with respect to oxygen: one Cu atom is bonded with four oxygen atoms in square planar configuration and another Cu atom is coordinated with five oxygen atoms in a pyramidal arrangement.
=== Peroxisome === There are two types of target peptides directing to peroxisome, which are called peroxisomal targeting signals (PTS). One is PTS1, which is made of three amino acids on the C-terminus. The other is PTS2, which is made of a 9-amino-acid sequence often present on the N-terminus of the protein.
diphtheriae infection (Barcoo rot, diphtheric desert sore, septic sore, Veldt sore) Cutaneous group B streptococcal infection Cutaneous Pasteurella hemolytica infection Cutaneous Streptococcus iniae infection Dermatitis gangrenosa (gangrene of the skin) Ecthyma Ecthyma gangrenosum Ehrlichiosis ewingii infection Elephantiasis nostras Endemic typhus (murine typhus) Epidemic typhus (epidemic louse-borne typhus) Erysipelas (ignis sacer, Saint Anthony's fire) Erysipeloid of Rosenbach Erythema marginatum Erythrasma External otitis (otitis externa, swimmer's ear) Felon Flea-borne spotted fever Flinders Island spotted fever Flying squirrel typhus Folliculitis Fournier gangrene (Fournier gangrene of the penis or scrotum) Furunculosis (boil) Gas gangrene (clostridial myonecrosis, myonecrosis) Glanders (equinia, farcy, malleus) Gonococcemia (arthritis–dermatosis syndrome, disseminated gonococcal infection) Gonorrhea (clap) Gram-negative folliculitis Gram-negative toe web infection Granuloma inguinale (Donovanosis, granuloma genitoinguinale, granuloma inguinale tropicum, granuloma venereum, granuloma venereum genitoinguinale, lupoid form of groin ulceration, serpiginous ulceration of the groin, ulcerating granuloma of the pudendum, ulcerating sclerosing granuloma) Green nail syndrome Group JK Corynebacterium sepsis Haemophilus influenzae cellulitis Helicobacter cellulitis Hospital furunculosis Hot tub folliculitis (Pseudomonas aeruginosa folliculitis) Human granulocytotropic anaplasmosis Human monocytotropic ehrlichiosis Impetigo contagiosa Japanese spotted fever Leptospirosis (Fort Bragg fever, pretibial fever, Weil's disease) Listeriosis Ludwig's angina Lupoid sycosis Lyme disease (Afzelius' disease, Lyme borreliosis) Lymphogranuloma venereum (climatic bubo, Durand–Nicolas–Favre disease, lymphogranuloma inguinale, poradenitis inguinale, strumous bubo) Malakoplakia (malacoplakia) Mediterranean spotted fever (Boutonneuse fever) Melioidosis (Whitmore's disease) Meningococcemia Missouri Lyme disease Mycoplasma infection Necrotizing fasciitis (flesh-eating bacteria syndrome) Neonatal toxic shock-like exanthematous disease Nocardiosis Noma neonatorum North Asian tick typhus Ophthalmia neonatorum Oroya fever (Carrion's disease) Pasteurellosis Perianal cellulitis (perineal dermatitis, streptococcal perianal disease) Periapical abscess Pinta Pitted keratolysis (keratolysis plantare sulcatum, keratoma plantare sulcatum, ringed keratolysis) Plague Primary gonococcal dermatitis Pseudomonal pyoderma Pseudomonas hot-foot syndrome Pyogenic paronychia Pyomyositis Q fever Queensland tick typhus Rat-bite fever Recurrent toxin-mediated perineal erythema Rhinoscleroma Rickettsia aeschlimannii infection Rickettsialpox Rocky Mountain spotted fever Saber shin (anterior tibial bowing) Saddle nose Salmonellosis Scarlet fever Scrub typhus (Tsutsugamushi fever) Shigellosis Staphylococcal scalded skin syndrome (pemphigus neonatorum, Ritter's disease) Streptococcal intertrigo Superficial pustular folliculitis (impetigo of Bockhart, superficial folliculitis) Sycosis vulgaris (barber's itch, sycosis barbae) Syphilid Syphilis (lues) Tick-borne lymphadenopathy Toxic shock syndrome (streptococcal toxic shock syndrome, streptococcal toxic shock-like syndrome, toxic streptococcal syndrome) Trench fever (five-day fever, quintan fever, urban trench fever) Tropical ulcer (Aden ulcer, jungle rot, Malabar ulcer, tropical phagedena) Tularemia (deer fly fever, Ohara's disease, Pahvant Valley plague, rabbit fever) Verruga peruana Vibrio vulnificus infection Yaws (bouba, frambösie, parangi, pian)
Sources: en.wikipedia.org
The name reflects an early convention for naming thymus-derived fractions. The peptide is characterized and measured as a defined molecule, and it does not operate through a single classical endocrine axis.
The lyophilized solid is normally held at 2 to 8 °C in a sealed, light-protected container. Dry storage limits both hydrolysis and microbial growth. Material kept this way remains stable for the shelf life stated by the supplier.
Reverse-phase HPLC separates the peptide from related impurities and yields a purity estimate. Mass spectrometry confirms the expected molecular mass and flags sequence errors. The two techniques are commonly reported together on a certificate of analysis.
Short exposure during handling is not considered a major problem for the dry powder. Prolonged storage at ambient temperature, especially of reconstituted solutions, raises the risk of degradation. Cold storage remains the standard practice for longer periods.