This is a working overview of prothymosin alpha, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-12-18. Anything still debated is marked as such rather than presented as settled.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, which separates the target peptide from truncated or chemically modified byproducts. Mass spectrometry confirms the expected molecular mass and can indicate acetylation state or sequence errors. Amino acid analysis and peptide mapping supply complementary sequence-level information, while endotoxin testing is relevant for preparations intended for cell or animal work. Purity figures reported by suppliers refer to the method used and are not directly comparable across laboratories unless conditions are stated.
Lyophilized material is typically treated as a hygroscopic solid that should be brought to room temperature before the container is opened, which limits condensation on the powder. Reconstitution is commonly done with sterile water or a buffered diluent, and gentle mixing is preferred over vigorous agitation to reduce foaming and surface adsorption. Because peptides can bind to plastic and glass, diluents containing a small amount of carrier protein are sometimes used in laboratory work. Working solutions are generally aliquoted and prepared fresh rather than subjected to repeated freezing and thawing.
Stability depends on temperature, pH, and the number of freeze-thaw events the sample has experienced. Freeze-dried material is commonly held at -20 °C or colder, while reconstituted liquid is kept cold and used within a short window. Extreme pH and prolonged light exposure can promote deamidation, oxidation, or aggregation, particularly at asparagine and methionine positions. Adsorption to container walls can lower the measured concentration of a dilute solution even when the peptide molecules themselves remain intact.
Whether the free 28-residue peptide circulates in human tissue remains debated. The best-documented human source is prothymosin alpha, a larger acidic protein that carries the sequence at its N-terminus. Reports of measurable peptide levels in serum and lymphoid tissue exist, yet some of that signal may come from cross-reacting fragments or from the parent protein. Most reviews therefore treat prothymosin alpha as the established human molecule and describe independent circulation of the small peptide as an unresolved question.
Immunological studies connect the peptide to multiple parts of the immune response. It has been reported to engage Toll-like receptor signaling, to promote dendritic cell maturation, and to influence the balance of T helper cell subsets. Changes in natural killer cell activity and in cytokine release appear in cell culture and animal models. These observations describe broad immunomodulatory behavior rather than a single defined receptor target, and the primary molecular interaction has not been settled.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white lyophilized powder | Visual description varies by batch |
| Solubility | Freely soluble in water | Aqueous buffers are commonly used |
| Typical storage temperature | -20 °C or below for powder | Reconstituted liquid kept at 2-8 °C short term |
| Purity method | Reversed-phase HPLC | Value derived from peak area integration |
| Identity method | Mass spectrometry | Confirms mass and sequence integrity |
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.
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.
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.
Until 2009 all species within the family Conidae were placed in one genus, Conus. Testing of the molecular phylogeny of the Conidae was first conducted by Christopher Meyer and Alan Kohn, and has continued, particularly with the advent of nuclear DNA testing. In 2009, J.K. Tucker and M.J. Tenorio proposed a classification system consisting of three distinct families and 82 genera for living species of cone snails. This classification is based on shell morphology, radular differences, anatomy, physiology, and cladistics, with comparisons to molecular (DNA) studies. Published accounts of Conidae that use these new genera include J.K. Tucker & M.J. Tenorio (2009), and Bouchet et al. (2011). Tucker and Tenorio's proposed classification system for the cone shells and other clades of Conoidean gastropods is shown in Tucker & Tenorio cone snail taxonomy 2009. Some experts, however, still prefer to use the traditional classification. For example, in the November 2011 version of the World Register of Marine Species, all species within the family Conidae were placed in the genus Conus. The binomial names of species in the 82 genera of living cone snails listed in Tucker & Tenorio 2009 were recognized by the World Register of Marine Species as "alternative representations". Debate within the scientific community regarding this issue has continued, and additional molecular phylogeny studies are being carried out in an attempt to clarify the issue.
Infliximab, a chimeric monoclonal antibody, sold under the brand name Remicade among others, is a medication used to treat a number of autoimmune diseases. This includes Crohn's disease, ulcerative colitis, rheumatoid arthritis, ankylosing spondylitis, psoriasis, psoriatic arthritis, and Behçet's disease. It is given by slow injection into a vein, typically at six- to eight-week intervals. Common side effects include infections, acute infusion reactions, and abdominal pain. Infliximab is a chimeric monoclonal antibody biologic. It seems to work by binding to and neutralizing TNF, preventing it from interacting with its receptors on the cell. TNF is a chemical messenger (cytokine) and a key part of the autoimmune reaction. Infliximab was originally developed in mice as a mouse antibody. Because humans have immune reactions to mouse proteins, the mouse common domains were replaced with similar human antibody domains. They are monoclonal antibodies and have identical structures and affinities to the target. Because they are a combination of mouse and human antibody amino acid sequences, they are called a "chimeric monoclonal antibody". Infliximab was approved for medical use in the United States in 1998, and in the European Union in August 1999. Infliximab biosimilars have been approved in the EU (2013), in Japan (2014), and in the United States (2016, 2017, 2019). Infliximab is a therapeutic alternative on the World Health Organization's List of Essential Medicines.
by Kimura). In 1981, Joseph Felsenstein proposed a four-parameter model (F81) in which the substitution rate corresponds to the equilibrium frequency of the target nucleotide. Hasegawa, Kishino, and Yano unified the two last models to a five-parameter model (HKY). After these pioneering efforts, many additional sub-models of the GTR model were introduced into the literature (and common use) in the 1990s. Other models that move beyond the GTR model in specific ways were also developed and refined by several researchers. Almost all DNA substitution models are mechanistic models (as described above). The small number of parameters that one needs to estimate for these models makes it feasible to estimate those parameters from the data. It is also necessary because the patterns of DNA sequence evolution often differ among organisms and among genes within organisms. The later may reflect optimization by the action of selection for specific purposes (e.g. fast expression or messenger RNA stability) or it might reflect neutral variation in the patterns of substitution. Thus, depending on the organism and the type of gene, it is likely necessary to adjust the model to these circumstances.
In 1986 and 1987, Transkei, a larger, wealthier, and more populous entity, undertook a series of military raids on Ciskei, and attempted to seize control of Ciskei. One of these raids was an attack on leader Lennox Sebe's compound, with the apparent goal of taking him hostage, in order to force a merger of the two Bantustans. Transkei had previously granted sanctuary to Lennox Sebe's estranged brother, Charles, the former head of Ciskei's security forces, who had been imprisoned in Ciskei on charges of sedition, in addition to previously kidnapping Lennox Sebe's son. The South African government ostensibly intervened to warn the Transkei government off. However, during a later meeting of the Truth and Reconciliation Commission, it was revealed that the plan to amalgamate the Transkei and Ciskei into a proposed Xhosaland, as well as the freeing of Charles Sebe from prison, had been carried out by South African security forces linked to the Civil Cooperation Bureau, in order to consolidate an anti-ANC front in the Eastern Cape region, as part of the abortive Operation Katzen.
Sources: en.wikipedia.org
=== Zeolites === Zeolites are natural or synthetic crystalline aluminosilicates, which have a repeating pore network and release water at high temperature. Zeolites are polar in nature. They are manufactured by hydrothermal synthesis of sodium aluminosilicate or another silica source in an autoclave followed by ion exchange with certain cations (Na+, Li+, Ca2+, K+, NH4+). The channel diameter of zeolite cages usually ranges from 2 to 9 Å. The ion exchange process is followed by drying of the crystals, which can be pelletized with a binder to form macroporous pellets. Zeolites are applied in drying of process air, CO2 removal from natural gas, CO removal from reforming gas, air separation, catalytic cracking, and catalytic synthesis and reforming. Non-polar (siliceous) zeolites are synthesized from aluminum-free silica sources or by dealumination of aluminum-containing zeolites. The dealumination process is done by treating the zeolite with steam at elevated temperatures, typically greater than 500 °C (930 °F). This high-temperature heat treatment breaks the aluminum-oxygen bonds and the aluminum atom is expelled from the zeolite framework.
Russia's Federal Security Service (FSB) claimed to have intercepted 70 kilograms of RDX, an RPG-7 and other bomb-making material at a border crossing in Pskov Oblast from Latvia. Originating from Ukraine, the paperwork indicated that it travelled through several EU countries before reaching the Russian border. The weapons were discovered hidden in Orthodox religious icons and paraphernalia.
== External links == http://www.asap.unimelb.edu.au/asap_inf.htm – Australian Science Archives Project From http://www.asap.unimelb.edu.au/bsparcs/aasmemoirs AAS Biographical Memoirs (1966–1996) From http://www.sciencearchive.org.au "Fellows elected in 2005". Australian Academy of Science. Archived from the original on 25 March 2016. "Fellows elected in 2006". Australian Academy of Science. Archived from the original on 23 March 2016. "Fellows elected in 2007". Australian Academy of Science. Archived from the original on 1 April 2016. "Fellows elected in 2008". Australian Academy of Science. Archived from the original on 23 March 2016. "Fellows elected in 2009". Australian Academy of Science. Archived from the original on 24 September 2015. "Fellows elected in 2010". Australian Academy of Science. Archived from the original on 3 April 2016. "Fellows elected in 2011". Australian Academy of Science. Archived from the original on 24 September 2015. "Fellows elected in 2012". Australian Academy of Science.{{cite web}}: CS1 maint: deprecated archival service (link) "Fellows elected in 2013". Australian Academy of Science. Archived from the original on 25 March 2016. From https://www.science.org.au "Fellows elected in 2010". Australian Academy of Science. "Fellows elected in 2011". Australian Academy of Science. "Fellows elected in 2012". Australian Academy of Science. "Fellows elected in 2013". Australian Academy of Science. "Fellows elected in 2014". Australian Academy of Science. "Fellows elected in 2015". Australian Academy of Science. "Fellows elected in 2016".
Daniel Siebert identified salvinorin A as the active constituent of Salvia divinorum via self-experimentation in 1993 and published these findings in 1994. Jonathan Ott published a paper on use of salvinorin A by various means and its effects in 1995. D. M. Turner published his book Salvinorin: The Psychedelic Essence of Salvia Divinorum, further describing salvinorin A's hallucinogenic effects in humans, in 1996. Salvinorin A was identified as a highly selective and potent κ-opioid receptor (KOR) agonist by Bryan L. Roth and colleagues in 2002. Dennis McKenna has shared that he identified salvinorin A as an extremely high-affinity KOR ligand while working at Shaman Pharmaceuticals in the early 1990s, but did not publish his findings as he could not believe how potent it was and thought that his results were erroneous. Roland Griffiths and colleagues and other researchers characterized the effects of salvinorin A in humans in formal clinical studies in the 2010s. Griffiths and colleagues further showed that salvinorin A's hallucinogenic and other effects in humans were blocked by the KOR antagonist naltrexone in 2016.
== Prognosis == As of 2015, 5-year survival rates for small cell lung cancer (extensive and limited) range between 3.6% and 32.2% for women, and between 2.2% and 24.5% for men. Relative 5-year survival rate for both sexes has increased from 3.6% in 1975 to 6.7% in 2014. In limited-stage disease, the relative 5-year survival rate (both sexes, all races, all ages) is 21.3%; however, women have higher 5-year survival rates, 26.9%, and men have lower survival rates, 21.3%. The prognosis is far grimmer in extensive-stage small-cell lung carcinoma where 5-year relative survival rate (both sexes, all races, all ages) is 2.8%; however, women have higher 5-year survival rates, 3.4%, and men have lower 5-year survival rates, 2.2%. Small-cell carcinoma is very responsive to chemotherapy and radiotherapy, and in particular, regimens based on platinum-containing agents. However, most people with the disease relapse, and median survival remains low. The overall incidence and mortality rates of SCLC in the United States have decreased during the past few decades. Long-term survival of more than 5 years can be achieved with proper treatment. According to the 17th World Conference on Lung Cancer (WCLC), "patients who received chest radiation and prophylactic cranial irradiation along with a mean of five chemotherapy cycles could achieve a median survival of more than 5 years." In some cases, long-term survival of 10+ years is achieved with chemotherapy and radiation alone. A 2023 article stated that the median overall survival is about 1 year, the worst of any lung cancer subtype.
Sources: en.wikipedia.org
=== Acatalasia === Acatalasia is a condition caused by homozygous mutations in CAT, resulting in a lack of catalase. Symptoms are mild and include oral ulcers. A heterozygous CAT mutation results in lower, but still present catalase.
John D. Rockefeller Jr. was an outspoken supporter of eugenics. Even as late as 1951, John D. Rockefeller III and John Foster Dulles, who was chairman of the foundation at the time, established the Population Council to advance family planning, birth control, and population control, and goals of the eugenics movement. The Rockefeller Foundation, along with the Carnegie Institution, was the primary financier for the Eugenics Record Office, until 1939. The foundation also provided grants to Margaret Sanger and Alexis Carrel, who supported birth control, compulsory sterilization and eugenics. Sanger went to Japan in 1922 and influenced the birth control movement there. By 1926, Rockefeller had donated over $400,000, which would be almost $4 million adjusted for inflation in 2003, to hundreds of German researchers, including Ernst Rüdin and Otmar Freiherr von Verschuer, through funding the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics, (also known as the Max Planck Institute for Medical Research) which conducted eugenics experiments in Nazi Germany and influenced the development of Nazi racial scientific ideology. Rockefeller spent almost $3 million between 1925 and 1935, and also funded other German eugenicists, Herman Poll, Alfred Grotjahn, Eugen Fischer, and Hans Nachsteim, continuing even after Hitler's ascent to power in 1933; Rüdin's work influenced compulsory sterilisation in Nazi Germany.
monocyte A type of large leukocyte of the mononuclear phagocyte system in mammals, characterized by pale-staining cytoplasm and a kidney-shaped or horseshoe-shaped nucleus. Monocytes are derived from pluripotent stem cells in bone marrow and become macrophages in other tissues.
== Research == Flupirtine has been noted for its neuroprotective properties, and has been investigated for possible use in Creutzfeldt–Jakob disease, Alzheimer's disease, and multiple sclerosis. It has also been proposed as a possible treatment for Batten disease. Flupirtine underwent a clinical trial as a treatment for multiple sclerosis and fibromyalgia. Flupirtine showed promise for fibromyalgia due to its different action than the three approved by U.S. FDA drugs: pregabalin, milnacipran, and duloxetine. Additionally, there are case reports regarding flupirtine as a treatment for fibromyalgia. Adeona Pharmaceuticals (now called Synthetic Biologics) sub-licensed its patents for using flupirtine for fibromyalgia to Meda AB in May 2010.
== Compartmentalization and genome integration == Hypercycle theory proposed that hypercycles are not the final state of organization, and further development of more complicated systems is possible by enveloping the hypercycle in some kind of membrane. After evolution of compartments, a genome integration of the hypercycle can proceed by linking its members into a single chain, which forms a precursor of a genome. After that, the whole individualized and compartmentalized hypercycle can behave like a simple self-replicating entity. Compartmentalization provides some advantages for a system that has already established a linkage between units. Without compartments, genome integration would boost competition by limiting space and resources. Moreover, adaptive evolution requires the package of transmissible information for advantageous mutations in order not to aid less-efficient copies of the gene. The first advantage is that it maintains a high local concentration of molecules, which helps to locally increase the rate of synthesis. Secondly, it keeps the effect of mutations local, while at the same time affecting the whole compartment. This favours preservation of beneficial mutations, because it prevents them from spreading away. At the same time, harmful mutations cannot pollute the entire system if they are enclosed by the membrane. Instead, only the contaminated compartment is destroyed, without affecting other compartments. In that way, compartmentalization allows for selection for genotypic mutations.
Sources: en.wikipedia.org
Cold storage slows the chemical degradation reactions that occur in solution. Lyophilized powder is more stable than reconstituted liquid and tolerates longer storage periods. Repeated temperature cycling should still be avoided because it can drive aggregation and loss of material.
Mass spectrometry is the standard confirmation of molecular mass and acetylation state. Chromatography establishes purity but does not identify the molecule on its own. The two techniques are normally applied together during verification.
No, because the reported value reflects the detection method and wavelength used, which vary between laboratories. A number stated without method details cannot be compared directly with another supplier's figure. Requesting the chromatogram and the method conditions is a common way to interpret it.
It is usually described as an immunomodulatory peptide rather than a classic circulating hormone. No endocrine gland is known to release it as a primary secretory product, and its measured presence in blood is not firmly established.