The short version of HGF/c-Met fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
Dihexa is a synthetic peptide whose structure is modeled on angiotensin IV. Its chemical name often appears as N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide, though vendor and publication naming can differ. The molecule combines a short amino acid sequence with a hexanoic acid group and an amide terminus. It is classed as a small research peptide rather than a conventional drug. Databases may list it under several synonyms, so matching names are important when comparing sources.
The angiotensin IV connection places dihexa in a family of short peptides studied for effects on central nervous system signaling. Angiotensin IV itself is a metabolite of angiotensin II, and analogs have been explored in cardiovascular and neurological research. Dihexa differs from the natural peptide through structural modifications intended to alter stability and receptor interactions. Published descriptions sometimes call it a hepatocyte growth factor mimetic, although that label reflects proposed activity rather than a confirmed clinical mechanism.
Identity checks for dihexa usually rely on mass spectrometry and chromatographic purity analysis. A lyophilized powder is the common supplied form, and it may appear as a white to off-white solid. Aqueous solubility is limited, so laboratory work often uses an organic solvent such as dimethyl sulfoxide to prepare stock solutions. Because the peptide is not a standard pharmaceutical product, exact specifications can vary between suppliers. Certificates of analysis may accompany a batch, but they are not equivalent to regulatory approval.
Dihexa is typically supplied as a lyophilized powder for laboratory research. Lyophilization removes water and improves stability during transport and storage. The solid is commonly stored at -20 °C or lower, desiccated, and protected from light. Repeated freeze-thaw cycles and exposure to moisture can degrade peptides, so aliquoting and sealed containers are standard practice in most laboratory settings. These handling measures apply to research-grade material and do not imply clinical suitability.
Purity and identity are usually assessed with reverse-phase high-performance liquid chromatography (RP-HPLC) and mass spectrometry. RP-HPLC separates components by hydrophobicity and can estimate peptide purity. Mass spectrometry confirms molecular mass and helps detect truncations or modifications. Some laboratories also use amino acid analysis or nuclear magnetic resonance for structural verification. A certificate of analysis from a supplier may list these results, but independent verification is often recommended for critical work.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic peptide analog | Modeled on angiotensin IV; not a natural hormone. |
| Common synonyms | Dihexa; N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide | Naming conventions differ across vendors and papers. |
| CAS Registry Number | 1401708-83-6 | Listed in some chemical databases; verify against primary sources. |
| Appearance | White to off-white powder | Typical form for lyophilized research peptides. |
| Solubility | Soluble in DMSO; limited in water | Organic stock solutions are common in laboratory settings. |
In laboratory settings, dihexa is typically handled as a research chemical rather than a pharmaceutical product. Suppliers may provide it as a lyophilized powder or in solution, and purity is often stated as a percentage determined by chromatographic analysis. Because independent verification is uncommon, researchers generally rely on certificates of analysis, which may include high-performance liquid chromatography and mass spectrometry data. The absence of pharmacopeial monographs means that identity, purity, and impurity profiles can vary between batches and suppliers.
Storage recommendations for peptides and peptide-like compounds usually emphasize low temperatures, desiccation, and protection from light. A common practice is to keep dry powder at -20 °C or below and to prepare solutions shortly before use. Repeated freeze-thaw cycles may degrade the material, so aliquoting is often advised. Solubility depends on the solvent; aqueous solubility may be limited, and organic solvents such as dimethyl sulfoxide are sometimes used for stock solutions. Stability data specific to dihexa are sparse, so general peptide handling guidelines are often applied instead.
The leading hypothesis for dihexa centers on hepatocyte growth factor (HGF) and its receptor, c-Met. In cell-based assays, dihexa has been reported to potentiate HGF-dependent signaling. That pathway influences cell growth, survival, and motility. Because c-Met signaling is widespread, the proposed mechanism is broad rather than specific to neurons. The exact binding site and stoichiometry remain areas of active investigation, and independent replication is limited. This uncertainty limits firm conclusions about how the compound acts in living organisms.
Animal studies have examined dihexa in models of cognitive impairment, synaptic plasticity, and memory. Some reports describe improved performance on maze or avoidance tasks after administration. These findings are preclinical and often involve small samples, varied routes, and differing formulations. Results in rodents do not establish effects in humans. The absence of published randomized controlled trials in people is a major gap in the evidence base. Observational reports and user accounts do not substitute for controlled clinical data.
The proposed mechanism for dihexa centers on hepatocyte growth factor, or HGF, and its receptor c-Met. HGF signaling is involved in cell growth, survival, and synapse formation. Dihexa has been described as an HGF mimetic or modulator in preclinical literature. Whether it binds c-Met directly, increases HGF availability, or acts through another route remains uncertain. This mechanistic uncertainty is a recurring theme in reviews of the compound, and no single molecular model has been confirmed across independent laboratories.
Research on dihexa has primarily used rodent models and cultured cells. Common endpoints include dendritic spine density, synaptic protein expression, and performance on maze or avoidance tasks. Some studies report improvements in cognitive measures after scopolamine-induced deficits or in aged animals. These findings are interesting but come from a small body of work, and independent laboratories have not consistently replicated all reported effects. Larger, preregistered studies would help clarify which results are robust.
In 80–85% of cases, the ALK detected in ALK-positive ALCL is a NPM1-ALK fusion protein. It is made by a fusion of NPM1 gene, which makes nucleophosmin 1, located on the long or "q" arm of chromosome 5 at position 35 (notated as 5q35) with the ALK gene located on the short or "p" arm of chromosome 2 at position 23 (notated as 2p23) to form a chimeric gene notated as (2;5)(p23;q35). In 13% of cases ALK fuses with the TPM3 gene or in <1% of cases for each of the following genes: TFG, ATIC, CLTC, TPM4, MSN, RNF213 (also termed ALO17), MYH9, or TRAF1. All of these fusion proteins are considered to act like NPMI-ALK in possessing high ALK activity that promotes the development and progression ALK-positive ALCL by activating the cell signaling pathways cited in the Introduction. 15% Of individuals with ALK-positive ALCL also have point mutations in the NOTCH1 gene. While most of these abnormalities are thought to be detrimental not all are. For example, DUSP22 gene rearrangements are associated with favorable outcomes in ALK-positive (as well as ALK-negative) ALCL.
Effective on new passenger cars sold in the United States after January 1, 1964. front outboard lap belts were required. On September 9, 1966, the National Traffic and Motor Vehicle Safety Act became law in the U.S., the first mandatory federal safety standards for motor vehicles. Effective in 1966, US-market passenger cars were required to be equipped with padded instrument panels, front and rear outboard lap belts, and white reverse (backup) lamps. In 1966, the U.S. established the United States Department of Transportation (DOT) with automobile safety as one of its purposes. The National Transportation Safety Board (NTSB) was created as an independent organization on April 1, 1967, but was reliant on the DOT for administration and funding. However, in 1975 the organization was made completely independent by the Independent Safety Board Act (in P.L. 93-633; 49 U.S.C. 1901). In 1967, equipment specifications by such major fleet purchasers as the City and County of Los Angeles, California, encouraged the voluntary installation in most new cars sold in the US of safety devices, systems, and design features including:
A/B testing (also known as bucket testing, split-run testing or split testing) is a user-experience research method. A/B tests consist of a randomized experiment that usually involves two variants (A and B), although the concept can be also extended to multiple variants of the same variable. It includes application of statistical hypothesis testing or "two-sample hypothesis testing" as used in the field of statistics. A/B testing is employed to compare multiple versions of a single variable, for example by testing a subject's response to variant A against variant B, and to determine which of the variants is more effective. Multivariate testing or multinomial testing is similar to A/B testing but may test more than two versions at the same time or use more controls. Simple A/B tests are not valid for observational, quasi-experimental or other non-experimental situations—commonplace with survey data, offline data, and other, more complex phenomena.
Sources: en.wikipedia.org
The permeability of a membrane is the rate of passive diffusion of molecules through the membrane. These molecules are known as permeant molecules. Permeability depends mainly on the electric charge and polarity of the molecule and to a lesser extent the molar mass of the molecule. Due to the cell membrane's hydrophobic nature, small electrically neutral molecules pass through the membrane more easily than charged, large ones. The inability of charged molecules to pass through the cell membrane results in pH partition of substances throughout the fluid compartments of the body. Lipids, Membranes and Vesicle Trafficking – The Virtual Library of Biochemistry and Cell Biology Cell membrane protein extraction protocol Membrane homeostasis, tension regulation, mechanosensitive membrane exchange and membrane traffic 3D structures of proteins associated with plasma membrane of eukaryotic cells Lipid composition and proteins of some eukariotic membranes Prokaryotic and Eukaryotic Cells
Ancestim is a recombinant methionyl human stem cell factor, branded by Amgen as StemGen. It was developed by Amgen and sold to Biovitrium, now Swedish Orphan Biovitrum, in December, 2008. It is a 166 amino acid protein produced by E. coli bacteria into which a gene has been inserted for soluble human stem cell factor. It has a monomeric molecular weight of approximately 18,500 daltons and normally exists as a noncovalently associated dimer. The protein has an amino acid sequence that is identical to the natural sequence predicted from human DNA sequence analysis, except for the addition of an N-terminal methionine retained after expression in E. coli. Because Ancestim is produced in E. coli, it is nonglycosylated. Ancestim is supplied as a sterile, white, preservative-free, lyophilised powder for reconstitution and administration as a subcutaneous (SC) injection and is indicated for use in combination with filgrastim for mobilizing peripheral hematopoietic stem cells for later transplantation in certain cancer patients.
An analytical ultracentrifuge has a light source and optical detectors. To allow the light to pass through the analyte during the ultracentrifuge run, specialized cells are required which have to meet high optical standards as well as to resist the centrifugal forces. Each cell consists of a housing, two windows made from optically pure quartz glass, and a centrepiece with one or two sectors and filling holes for the sector(s), closed with a screw plug in the housing. These cell are placed into a rotor cavity with a continuous bore, with a collar at the bottom to retain the cell. By applying specific equipment and adapting measurement parameters several types of experiments can be performed. Most common AUC experiments are sedimentation velocity and sedimentation equilibrium experiments.
Sources: en.wikipedia.org
The tournament will be hosted by whoever wins the regular season title. Right now, either James Madison or Old Dominion will host the tournament, depending on their regular season outcomes. Last updated: October 31, 2011Source: NMN Athletics Colonial Athletic Association 2011 CAA Men's Soccer Tournament 2011 NCAA Division I men's soccer season 2011 NCAA Division I Men's Soccer Championship
The Public Affairs Office works with the PAAC to advocate for increased research budgets for the major governmental funding agencies, primarily the National Institutes of Health and the National Science Foundation. ASBMB has developed a set of recommendations for pre-medical course requirements consistent with the new Medical College Admission Test. Advocacy efforts also focus on protecting the conditions that promote a successful research environment. In addition, the office works to maintain a healthy relationship between ASBMB members, government officials, and the public in order to foster awareness of the importance of science to everyday life. As part of their advocacy efforts, ASBMB organizes Capitol Hill Day, an annual event that allows graduate students and trainees to meet their congressional representatives in Washington, D.C. List of biochemistry awards Official website American Society for Biochemistry and Molecular Biology records, 1906-2005 at the University of Maryland, Baltimore County
Although an estimated 43,000 species of bacteria have been named, most of them have never been studied. In fact, just 10 bacterial species account for half of all publications, whereas nearly 75% of all named bacteria have no academic research devoted to them. The best-studied species, Escherichia coli, has more than 300,000 studies published on it, but many of these papers likely use it only as a cloning vehicle to study other species, without providing any insight into its own biology. 90% of scientific studies on bacteria focus on less than 1% of species, mostly pathogenic bacteria relevant to human health. While E. coli is probably the best-studied bacterium, a quarter of its 4000 genes are poorly studied or remain uncharacterized. Some bacteria with minimal genomes (< 600 genes, e.g. Mycoplasma) usually have a large fraction of their genes functionally characterized, given that most of them are essential and conserved in many other species.
Sources: en.wikipedia.org
Dihexa is a synthetic peptide analog related to angiotensin IV. It is studied in preclinical research for effects on neural signaling and synapse formation. It is not an approved medicine.
No. Dihexa shares a conceptual link to angiotensin IV but has different structural features. Those changes are intended to modify its behavior in biological systems.
It often appears as N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide. Synonyms and CAS listings vary, so cross-checking identifiers is necessary.
The lyophilized powder is generally stored at -20 °C or lower, desiccated, and protected from light. Solutions are often aliquoted to avoid repeated freeze-thaw cycles. Specific stability data may vary by formulation and purity.