If you have been reading about neurotrophic signaling and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2025-12-12. Numbers and descriptions here follow the published literature rather than marketing material.
Published research covers ischemic stroke, traumatic brain injury, cognitive impairment, optic nerve conditions and attention-related measures. Much of the human evidence comes from small trials conducted in one country, which limits how far the results generalize. Animal models supply the larger share of the data, and effects seen in rodents do not transfer automatically to people. Reviews have noted that methodological reporting is often incomplete, making it difficult to pool results or compare treatment schedules across studies.
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
| Property | Value | Notes |
|---|---|---|
| Primary research models | Rodent studies | Largest share of published data |
| Reported markers | BDNF and NGF expression | Measured mainly in animal tissue |
| Common administration | Intranasal | Matches the registered formulation |
| Blood residence time | Minutes | Rapid enzymatic degradation |
| Evidence quality | Small trials, limited replication | Noted repeatedly in reviews |
Ixazomib (trade name Ninlaro) is a drug for the treatment of multiple myeloma, a type of white blood cell cancer, in combination with other drugs. It is taken by mouth in the form of capsules. Common side effects include diarrhea, constipation and low platelet count. Like the older bortezomib (which can only be given by injection), it acts as a proteasome inhibitor, has orphan drug status in the US and Europe, and is a boronic acid derivative. The drug was developed by Takeda. In the US, it is approved since November 2015, and in the EU since November 2016.
Some other geogenic nuclides occur naturally as products of the spontaneous fission of one of these three long-lived nuclides, such as 126Sn, which makes up about 10−12 percent of all natural tin. Another, 99Tc, has also been detected, and there are five other long-lived fission products known.
== Degradation == Numerous cyclic nucleotide phosphodiesterases (PDE) can degrade cGMP by hydrolyzing cGMP into 5'-GMP. PDE 5, -6 and -9 are cGMP-specific while PDE1, -2, -3, -10 and -11 can hydrolyse both cAMP and cGMP. Phosphodiesterase inhibitors prevent the degradation of cGMP, thereby enhancing and/or prolonging its effects. For example, Sildenafil (Viagra) and similar drugs enhance the vasodilatory effects of cGMP within the corpus cavernosum by inhibiting PDE 5 (or PDE V). This is used as a treatment for erectile dysfunction. However, the drug can inhibit PDE6 in retina (albeit with less affinity than PDE5). This has been shown to result in loss of visual sensitivity but is unlikely to impair common visual tasks, except under conditions of reduced visibility when objects are already near visual threshold. This effect is largely avoided by other PDE5 inhibitors, such as tadalafil.
John Russell (1893–1917), recipient of the Victoria Cross, born in Holyhead Ceinwen Rowlands (1905–1983), a Welsh concert soprano and recording artist, born in Holyhead R. S. Thomas (1913–2000), a Welsh poet and Anglican priest poet, grew up in Holyhead Cledwyn Hughes, Baron Cledwyn of Penrhos (1916–2001) MP & politician, born in Holyhead, attended Ysgol Uwchradd Caergybi Barbara Margaret Trimble (1921–1995) a British writer of over 20 crime, thriller and romance novels, born in Holyhead David Crystal (born 1941) linguist and chair of the charity behind Holyhead's Ucheldre Centre, lives in Holyhead Glenys Kinnock (1944-2023) a politician, MEP, educated at Holyhead High School Dawn French (born 1957 in Holyhead) comedian and actress, co-star in French and Saunders Albert Owen (born 1959 in Holyhead) politician, MP for Ynys Môn from 2001 to 2019. Kevin Johnson (born 1960 in Holyhead), a managing partner at Medicxi Ventures, a venture capital firm Jason Evans (born 1968 in Holyhead), a Welsh photographer and lecturer on photography Ben Crystal (born 1977), an English actor, author, and producer brought up in Holyhead Gareth Williams (1978–2010) worked for GCHQ and SIS died in suspicious circumstances
obstructive type of cholestasis, where there is a mechanical blockage in the duct system that can occur from a gallstone or malignancy, and metabolic type of cholestasis, in which there are disturbances in bile formation that can occur because of genetic defects or acquired as a side effect of many medications. Classification is further divided into acute or chronic and extrahepatic or intrahepatic.
Sources: en.wikipedia.org
Lazarsfeld, however, had trouble both with the prose style of the work Adorno handed in and what Lazarsfeld thought was Adorno's "lack of discipline in... presentation." Adorno himself provided the following personal anecdote:
== Clinical significance == In addition to their roles in cancer development and chemotherapeutic drug resistance, GSTs are implicated in a variety of diseases by virtue of their involvement with GSH. Although the evidence is minimal for the influence of GST polymorphisms of the alpha, mu, pi, and theta classes on susceptibility to various types of cancer, numerous studies have implicated such genotypic variations in asthma, atherosclerosis, allergies, and other inflammatory diseases. Because diabetes is a disease that involves oxidative damage, and GSH metabolism is dysfunctional in diabetic patients, GSTs may represent a potential target for diabetic drug treatment. In addition, insulin administration is known to result in increased GST gene expression through the PI3K/AKT/mTOR pathway and reduced intracellular oxidative stress, while glucagon decreases such gene expression. Omega-class GST (GSTO) genes, in particular, are associated with neurological diseases such as Alzheimer's, Parkinson's, and amyotrophic lateral sclerosis; again, oxidative stress is believed to be the culprit, with decreased GSTO gene expression resulting in a lowered age of onset for the diseases.
=== Cardiac arrest === While intravenous calcium has been used in cardiac arrest, its general use is not recommended. Cases of cardiac arrest in which it is still recommended include high blood potassium, low blood calcium such as may occur following blood transfusions, and calcium channel blocker overdose. There is the potential that general use could worsen outcomes. If calcium is used, calcium chloride is generally the recommended form.
The scientific name Asteroidea was given to starfish by the French zoologist de Blainville in 1830. It is derived from the Greek aster, ἀστήρ (a star) and the Greek eidos, εἶδος (form, likeness, appearance). Starfish are included in the subphylum Asterozoa along with brittle and basket stars (order Ophiuroidea), the characteristics of which include a star-shaped body as adults, with multiple arms surrounding central disc. The arms of asteroids are skeletally connected to the disc by ossicles in the body wall while ophiuroids have clearly demarcated arms. The starfish are a large and diverse class with over 1,900 living species. There are seven extant orders: Brisingida, Forcipulatida, Notomyotida, Paxillosida, Spinulosida, Valvatida and Velatida. Living asteroids, the Neoasteroidea, are distinct from their forerunners in the Paleozoic. Their classification has changed little but there is debate in regards to Paxillosida. The deep-water sea daisies, though clearly Asteroidea and currently included in Velatida, do not fit easily in any accepted lineage. Phylogenetic data suggests that they may be a sister group, the Concentricycloidea, to the Neoasteroidea, or that the Velatida themselves may be a sister group.
=== Pharmaceutical derivatives === Imidazole substituents are found in many pharmaceuticals such as anticancer drug mercaptopurine. The imidazole group is present in many fungicides and antifungal, antiprotozoal, and antihypertensive medications. Imidazole is part of the theophylline molecule, found in tea leaves and coffee beans, that stimulates the central nervous system. A number of substituted imidazoles, including clotrimazole, are selective inhibitors of nitric oxide synthase. Other biological activities of the imidazole pharmacophore relate to the downregulation of intracellular Ca2+ and K+ fluxes, and interference with translation initiation. The substituted imidazole derivatives are valuable in treatment of many systemic fungal infections. Imidazoles belong to the class of azole antifungals, which includes ketoconazole, miconazole, and clotrimazole. For comparison, another group of azoles is the triazoles, which includes fluconazole, itraconazole, and voriconazole. The difference between the imidazoles and the triazoles involves the mechanism of inhibition of the cytochrome P450 enzyme class. The N3 of the imidazole compound binds to the heme iron atom of ferric cytochrome P450, whereas the N4 of the triazoles bind to the heme group. The triazoles have been shown to have a higher specificity for the cytochrome P450 than imidazoles, thereby making them more potent than the imidazoles.
Sources: en.wikipedia.org
==== Micronutrient undernutrition ==== Micronutrient undernutrition results from insufficient intake of vitamins and minerals. Worldwide, deficiencies in iodine, Vitamin A, and iron are the most common. Children and pregnant women in low-income countries are at especially high risk for micronutrient deficiencies. Anemia is most commonly caused by iron deficiency, but can also result from other micronutrient deficiencies and diseases. Vitamin B12 deficiency may cause anemia, but not in all cases, in which may result in changes in consciousness or thinking, or even irreversible neurological damage. This condition can have major health consequences. It is possible to have overnutrition simultaneously with micronutrient deficiencies; this condition is termed the double burden of malnutrition.
=== EC 1.3.99 With unknown physiological acceptors === EC 1.3.99.1: The activity is included in EC 1.3.5.1, succinate dehydrogenase (quinone) EC 1.3.99.2: Now EC 1.3.8.1, butyryl-CoA dehydrogenase. EC 1.3.99.3: now EC 1.3.8.7, medium-chain acyl-CoA dehydrogenase, EC 1.3.8.8, long-chain acyl-CoA dehydrogenase and EC 1.3.8.9, very-long-chain acyl-CoA dehydrogenase EC 1.3.99.4: 3-oxosteroid 1-dehydrogenase EC 1.3.99.5: 3-oxo-5α-steroid 4-dehydrogenase (acceptor) EC 1.3.99.6: 3-oxo-5β-steroid 4-dehydrogenase EC 1.3.99.7: Now EC 1.3.8.6, glutaryl-CoA dehydrogenase EC 1.3.99.8: 2-furoyl-CoA dehydrogenase EC 1.3.99.9: Now EC 1.21.99.1, β-cyclopiazonate dehydrogenase EC 1.3.99.10: Now EC 1.3.8.4, isovaleryl-CoA dehydrogenase EC 1.3.99.11: transferred to EC 1.3.5.2, dihydroorotate dehydrogenase EC 1.3.99.12: Now classified as EC 1.3.8.5, 2-methyl-branched-chain-enoyl-CoA reductase EC 1.3.99.13: Now EC 1.3.8.8, long-chain-acyl-CoA dehydrogenase EC 1.3.99.14: cyclohexanone dehydrogenase EC 1.3.99.15: Now EC 1.3.7.8 EC 1.3.99.16: isoquinoline 1-oxidoreductase EC 1.3.99.17: quinoline 2-oxidoreductase EC 1.3.99.18: quinaldate 4-oxidoreductase EC 1.3.99.19: quinoline-4-carboxylate 2-oxidoreductase EC 1.3.99.20: Now EC 1.3.7.9, 4-hydroxybenzoyl-CoA reductase EC 1.3.99.21: Now EC 1.3.8.3, (R)-benzylsuccinyl-CoA dehydrogenase EC 1.3.99.22: Now EC 1.3.98.3, coproporphyrinogen dehydrogenase EC 1.3.99.23: all-trans-retinol 13,14-reductase EC 1.3.99.24: Now EC 1.3.8.16, 2-amino-4-deoxychorismate dehydrogenase EC 1.3.99.25: carvone reductase EC 1.3.99.26: all-trans-ζ-carotene desaturase EC 1.3.99.27: 1-hydroxycarotenoid 3,4-desaturase EC 1.3.99.28: phytoene desaturase (neurosporene-forming) EC 1.3.99.29: phytoene desaturase (zeta-carotene-forming) EC 1.3.99.30: phytoene desaturase (3,4-didehydrolycopene-forming) EC 1.3.99.31: phytoene desaturase (lycopene-forming) EC 1.3.99.32: glutaryl-CoA dehydrogenase (non-decarboxylating) EC 1.3.99.33: urocanate reductase EC 1.3.99.34: Now classified as EC 1.3.7.11, 2,3-bis-O-geranylgeranyl-sn-glycero-phospholipid reductase EC 1.3.99.35: Now EC 1.3.7.15, chlorophyllide a reductase * EC 1.3.99.36: cypemycin cysteine dehydrogenase (decarboxylating) EC 1.3.99.37: 1-hydroxy-2-isopentenylcarotenoid 3,4-desaturase EC 1.3.99.38: menaquinone-9 β-reductase EC 1.3.99.39: carotenoid φ-ring synthase EC 1.3.99.40: carotenoid χ-ring synthase
=== Relationships === Carrey dated singer Linda Ronstadt for eight months in 1983. On March 28, 1987, Carrey married former actress and Comedy Store waitress Melissa Womer. The couple had one daughter. Carrey and Womer divorced in 1995. On September 23, 1996, Carrey married his Dumb and Dumber co-star Lauren Holly; this second marriage lasted less than a year. From 1999 to 2000, Carrey was engaged to his Me, Myself & Irene co-star Renée Zellweger. In 2002, he was in a relationship with January Jones. In 2005, Carrey met model and actress Jenny McCarthy, and he made public in June 2006 that they were in a romantic relationship. They ended it in April 2010, with McCarthy noting in October 2010 that they had remained good friends. In early 2011, Carrey was seen holding hands with America's Next Top Model contestant Anchal Joseph, leading to speculation that the two were dating. In 2012, Carrey met Cathriona White, a makeup artist from County Tipperary, Ireland. They dated between 2012 and 2015. On September 28, 2015, White was found dead from a prescription drug overdose; the death was ruled a suicide by the Los Angeles County Medical Examiner. Carrey was a pallbearer at her funeral in Cappawhite, Ireland. In January 2019 when Carrey attended the Golden Globes 2019 Party, he was accompanied by his then-girlfriend Ginger Gonzaga. The couple split after less than a year of dating.
DHA (dihydroxyacetone, also known as glycerone) is not a dye, stain or paint, but causes a chemical reaction with the amino acids in the dead layer on the skin surface. One of the pathways is a free radical-mediated Maillard reaction. The other pathway is the conventional Maillard reaction, a process well known to food chemists that causes the browning that occurs during food manufacturing and storage. It does not involve the underlying skin pigmentation nor does it require exposure to ultraviolet light to initiate the color change. However, for the 24 hours after self-tanner is applied, the skin is especially susceptible to ultraviolet, according to a 2007 study led by Katinka Jung of the Gematria Test Lab in Berlin. Forty minutes after the researchers treated skin samples with high levels of DHA they found that more than 180 percent additional free radicals formed during sun exposure compared with untreated skin. Another self-tanner ingredient, erythrulose, produced a similar response at high levels. For a day after self-tanner application, excessive sun exposure should be avoided and sunscreen should be worn outdoors, they say; an antioxidant cream could also minimize free radical production. Although some self-tanners contain sunscreen, its effect will not last long after application, and a fake tan itself will not protect the skin from UV exposure. The study by Jung et al. further confirms earlier results demonstrating that dihydroxyacetone in combination with dimethylisosorbide enhances the process of (sun-based) tanning.
Molybdenum is an essential element in most organisms; a 2008 research paper speculated that a scarcity of molybdenum in the Earth's early oceans may have strongly influenced the evolution of eukaryotic life (which includes all plants and animals). At least 50 molybdenum-containing enzymes have been identified, mostly in bacteria. Those enzymes include aldehyde oxidase, sulfite oxidase and xanthine oxidase. With one exception, Mo in proteins is bound by molybdopterin to give the molybdenum cofactor. The only known exception is nitrogenase, which uses the FeMoco cofactor, which has the formula Fe7MoS9C. In terms of function, molybdoenzymes catalyze the oxidation and sometimes reduction of certain small molecules in the process of regulating nitrogen, sulfur, and carbon. In some animals, and in humans, the oxidation of xanthine to uric acid, a process of purine catabolism, is catalyzed by xanthine oxidase, a molybdenum-containing enzyme. The activity of xanthine oxidase is directly proportional to the amount of molybdenum in the body. An extremely high concentration of molybdenum reverses the trend and can inhibit purine catabolism and other processes. Molybdenum concentration also affects protein synthesis, metabolism, and growth. Mo is a component in most nitrogenases. Among molybdoenzymes, nitrogenases are unique in lacking the molybdopterin. Nitrogenases catalyze the production of ammonia from atmospheric nitrogen:
Sources: en.wikipedia.org
The main proposal is modulation of neurotrophic factors such as brain-derived neurotrophic factor, supported largely by animal experiments. Receptor-level targets have not been firmly established. Most reviews describe the mechanism as only partially characterized.
The compound is registered as a medicine in Russia, so clinical work has concentrated there. Trials elsewhere are few and generally small. This geographic concentration is a recognized limitation in evidence reviews.
Some fraction may reach the central nervous system through olfactory pathways, and this is often cited as the rationale for the nasal route. The size of that fraction in humans is not well quantified. Blood concentrations after nasal dosing are low, which complicates measurement.
Reversed-phase HPLC gives the main purity figure, most often with UV detection near 214 nanometres. Mass spectrometry then confirms the molecular mass. Together the two methods distinguish a correct sequence from a closely related impurity.