The short version of Toll-like receptor fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-07-31. Anything still debated is marked as such rather than presented as settled.
Immune signaling studies link thymosin alpha 1 to Toll-like receptor pathways, particularly TLR2 and TLR9, on dendritic cells and other antigen-presenting cells. Activation of these receptors promotes maturation of T cells and increases natural killer cell activity. The peptide shifts cytokine output toward a T helper 1 profile, raising interferon gamma and interleukin 2 while modulating interleukin 10. Whether these effects translate into clinical benefit for any specific disease remains a subject of debate. Reported outcomes vary across trials and populations.
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.
The peptide lacks cysteine, methionine, and tryptophan, so disulfide scrambling and sulfur oxidation are not major degradation routes. Instead, aspartate residues can undergo isomerization or cyclization to succinimide intermediates, generating isoaspartate variants. Hydrolysis of peptide bonds also occurs slowly in solution. These changes may reduce biological activity even when the main peak remains detectable. Stability studies therefore track both potency and the appearance of related substances.
Lyophilized thymosin alpha 1 is typically stored refrigerated at 2 to 8 degrees Celsius and kept away from light. Reconstituted solutions are less stable and are usually used promptly after preparation. Repeated freeze-thaw cycles are avoided because they can promote aggregation and loss of activity. The peptide adsorbs to some plastic and glass surfaces, so a carrier protein is often added to dilute working solutions. Manufacturer instructions and published protocols both govern handling.
Identity and purity testing for thymosin alpha 1 relies mainly on reversed-phase high-performance liquid chromatography and mass spectrometry. Chromatography separates the parent peptide from truncated or modified variants, while mass spectrometry confirms the expected molecular mass. Amino acid analysis and peptide mapping provide additional sequence confirmation. Counterion content, water content, and residual solvents are measured separately as part of specification testing. No single method captures every attribute, so laboratories combine several techniques.
| 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 |
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.
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.
=== Nanofiltration === Virus removal processes using nanofiltration techniques remove viruses specifically by size exclusion. This type of process is typically used for parvoviruses and other viruses containing a protein coat. A typical HIV virion is 180 nm and a typical parvovirus can vary between 15 and 24 nm, which is very small. One great advantage of filtration, as opposed to methods involving extremes of temperature or acidity, is that filtration will not denature the proteins in the sample. Nanofiltration is also effective for most types of proteins. Since it is not chemically selective, no matter what the surface chemistry of the viral particle is, viral removal processes using nanofiltration techniques will still be effective. Another great advantage of this technique is its ability to be performed on a lab scale and then effectively scaled up to production standards. It is important to consider, however, the fact that the level of removal of the viruses is dependent on the size of the pores of the nanofilter. In some cases, very small viruses will not be filtered out. It is also necessary to consider the possible effects of pressure and flow rate variation. Some of the filters used for to perform these types of processes are Planova 15N, Planova 20N, BioEX, VAG - 300, Viresolve 180, Viresolve 70TM, and the Virosart range.
Water flow and feeding in the phylum Porifera (sponges) – Flash animations of sponge body structures, water flow and feeding Carsten's Spongepage, Information on the ecology and the biotechnological potential of sponges and their associated bacteria. History of Tarpon Springs sponge industry, Tarpon Springs, Florida Nature's 'fibre optics' experts The Sponge Reef Project Queensland Museum information about sponges Queensland Museum Sessile marine invertebrates collections Queensland Museum Sessile marine invertebrates research Sponge Guide for Britain and Ireland Archived 2008-12-08 at the Wayback Machine, Bernard Picton, Christine Morrow & Rob van Soest World Porifera database, the world list of extant sponges, includes a searchable database. Sponges: World production and markets // Food and Agriculture Organisation
== Signs and symptoms == It is seen as a yellow-white deposit on the conjunctiva adjacent to the limbus (the junction between the cornea and sclera). (It is to be distinguished clinically from a pterygium, which is a wedge shaped area of fibrosis that may grow onto the cornea.) A pinguecula usually does not cause any symptoms. It is most common in tropical climates and there is a direct correlation with UV exposure. Histologically, there is degeneration of the collagen fibers of the conjunctival stroma with thinning of the overlying epithelium and occasionally calcification. Actinic exposure of the thin conjunctival tissue is thought to cause fibroblasts to produce more elastin fibers, which are more twisted than normal elastin fibers and may lead to the degradation of the collagen fibers. Alternatively, it has been postulated that the sub-epithelial collagen fibers undergo degradation and assume the qualities of elastic tissue while fragmenting and twisting in a different configuration from their normal state. It is thought that the high reflectivity of the solid white scleral tissue underlying the conjunctival tissue may result in additional UV exposure to the back side of the tissue. The side of the nose also reflects sunlight on to the conjunctiva. As a result, pingueculae tend to occur more often on the nasal side of the eye. While most pingueculae are found in people over the age of 40, they are not uncommon in 20- and 30-year-old adults who spend significant time in the sun.
European Union officials, European ministers and Commissioner (Tonio) Borg set up an urgent meeting in Brussels on 13 February 2013 on how to contain the horse meat scandal that exposed flaws in European control systems on food safety, and to formulate an action plan. Following the meeting, EU agriculture ministers announced a three-month coordinated control plan of DNA testing of processed meat across the European Union. The plan, adopted 19 February 2013, called for 2,500 random tests on processed food for horse DNA and 4,000 for phenylbutazone (bute), beginning in March 2013, with initial results announced on 15 April 2013. The Hague-based Europol would handle the co-ordination of investigations among national authorities, as well as any raids on premises and arrests on suspicion of criminal conspiracy to defraud.
ASH1L (also called huASH1, ASH1, ASH1L1, ASH1-like, or KMT2H) is a histone-lysine N-methyltransferase enzyme encoded by the ASH1L gene located at chromosomal band 1q22. ASH1L is the human homolog of Drosophila Ash1 (absent, small, or homeotic-like). Ash1 was discovered as a gene causing an imaginal disc mutant phenotype in Drosophila. Ash1 is a member of the trithorax-group (trxG) of proteins, a group of transcriptional activators that are involved in regulating Hox gene expression and body segment identity. Drosophila Ash1 interacts with trithorax to regulate ultrabithorax expression. The human ASH1L gene spans 227.5 kb on chromosome 1, band q22. This region is rearranged in a variety of human cancers such as leukemia, non-Hodgkin's lymphoma, and some solid tumors. The gene is expressed in multiple tissues, with highest levels in brain, kidney, and heart, as a 10.5-kb mRNA transcript. Mutations in ASH1L in humans have been associated with autism, epilepsy, and intellectual disability.
Sources: en.wikipedia.org
== External links == "ETOH Database Search". hazelden.org. The National Institute on Alcohol Abuse and Alcoholism maintains a database of alcohol-related health effects. ETOH Archival Database (1972–2003) Alcohol and Alcohol Problems Science Database. "Harmful Interactions". National Institute on Alcohol Abuse and Alcoholism (NIAAA). WHO fact sheet on alcohol ChEBI – biology related Kyoto Encyclopedia of Genes and Genomes signal transduction pathway: KEGG – human alcohol addiction
== Medical uses == Dexrazoxane has been used to protect the heart against the cardiotoxic side effects of chemotherapeutic drugs such as anthracyclines, such as daunorubicin or doxorubicin or other chemotherapeutic agents. However, in July 2011 the European Medicines Agency (EMA) released a statement restricting use only in adult patients with cancer who have received > 300 mg/m2 doxorubicin or > 540 mg/m2 epirubicin and general approval for use for cardioprotection. That showed a possibly higher rate of secondary malignancies and acute myelogenous leukemia in pediatric patients treated for different cancers with both dexrazoxane and other chemotherapeutic agents that are associated with secondary malignancies. On 19 July 2017, based on evaluation of the currently available data the European Commission issued an EU-wide legally binding decision to implement the recommendations of the Committee for Medicinal Products for Human Use (CHMP) on dexrazoxane and lifted its 2011-contraindication for primary prevention of anthracycline-induced cardiotoxicity with dexrazoxane in children and adolescents where high doses (≥ 300 mg/m3) of anthracyclines are anticipated. Dexrazoxane was designated by the US FDA as an orphan drug for "prevention of cardiomyopathy for children and adults 0 through 16 years of age treated with anthracyclines". This decision allows virtually all children to receive dexrazoxane starting with the first dose of anthracycline at the discretion of the treating provider.
She concluded "I find it somewhat difficult to believe that, in a single raid, we find two new forms of Captagon." Videos compiled by the Israeli government of the Hamas attack—cobbled together from cell phones, GoPros, as well as car and surveillance cameras—allege that at least some of the militants were under the influence of the drug. Rose also said that "Fighters might have taken cocaine right before, or captagon, or no substances at all. Some might have taken caffeine, some may be sleep deprived...but there's no way that captagon was a factor to blame in the violence and atrocities that we witnessed on October 7".
===== Laboratory specimen transport ===== PTS are widely used for routine and urgent specimen transport from wards and emergency departments to central laboratories. Studies show that, when validated, PTS can achieve fast transit times without degrading analytical quality; however, laboratories typically perform local validation because effects can vary by analyte and system design.
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.
The lyophilized powder is kept refrigerated at 2 to 8 degrees Celsius and protected from light. Reconstituted solutions should be used promptly. Freezing and thawing repeatedly is avoided.