The short version of BDNF expression fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-10-04. Anything still debated is marked as such rather than presented as settled.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
Published studies are dominated by animal models of stroke, ischemia, and cognitive impairment, with a smaller number of human trials conducted in Russia. Many of the human reports are small, single-center, and published in Russian-language journals, which limits independent scrutiny. Outcome measures vary between studies and often rely on clinician-rated scales rather than objective biomarkers. Systematic reviews have noted the methodological weaknesses and called for larger, preregistered trials before firm conclusions can be drawn.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Published studies examine a fairly narrow set of endpoints. Rodent experiments commonly measure maze learning, infarct volume after induced ischemia, and tissue levels of neurotrophic factors. Clinical reports from Russian centres describe attention, memory and recovery scores in patients after stroke or transient ischemic attack. Most of those human studies are small and few have been repeated by independent groups. Outcome measures differ between studies, which limits direct comparison.
Circulation time for the peptide is short because peptidases cleave it readily. The Pro-Gly-Pro tail is thought to slow breakdown compared with the bare ACTH fragment, but the gain appears modest. Absorption after intranasal dosing is limited, and only a fraction of a dose is expected to reach the central nervous system. Laboratory concentrations therefore sit well above levels achieved systemically, a gap that complicates translation from bench findings to clinical claims.
The mechanisms attributed to semax are inferred from animal and cell studies rather than traced to one confirmed target. The most frequently cited pathway involves increased expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal and cortical tissue. Some work points to engagement of melanocortin receptors, particularly MC4, which the parent ACTH fragment can activate. Effects on dopaminergic and serotonergic signalling have also been reported. No single account explains all observed results, and the relative weight of each pathway remains unsettled.
| Property | Value | Notes |
|---|---|---|
| Appearance | White lyophilized powder | Typical for synthetic peptides |
| Solubility | Freely soluble in water | Also soluble in saline |
| Storage temperature | -20 C or below | Protect from repeated freeze-thaw |
| Analytical method | Reverse-phase HPLC | Confirms purity and identity |
| Common synonym | ACTH(4-10) analog | Reflects structural origin |
Proposed mechanisms center on neurotrophic signaling rather than on classical melanocortin receptor activation. Rodent experiments have reported shifts in the expression of brain-derived neurotrophic factor and nerve growth factor after administration, together with changes in the associated receptor systems. Several authors argue that the peptide acts largely through its degradation products and their interaction with peptidergic pathways, but this remains a hypothesis rather than a settled finding. No single molecular target has been identified in a way that the field broadly accepts.
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.
Avoid activities requiring mental alertness and coordination until drug effects are understood. Psychomotor slowing is a frequently reported adverse effect, though it often diminishes with prolonged use or through careful adjustment of dosage. Topiramate may impair heat regulation, especially in children. Use caution with activities leading to an increased core temperature, such as strenuous exercise, exposure to extreme heat, or dehydration. Topiramate may cause visual field defects. Topiramate may decrease the effectiveness of oestrogen-containing oral contraceptives. Taking topiramate in the first trimester of pregnancy may increase the risk of cleft lip/cleft palate in infants. As is the case for all antiepileptic drugs, it is advisable not to suddenly discontinue topiramate, as there is a theoretical risk of rebound seizures. Some studies have attributed loss of appetite and upper respiratory tract infection to topiramate, but studies have concluded these adverse events are not difficult to tolerate for most individuals.
Trading with the Enemy Act of 1917 Foreign Assistance Act of 1961 International Emergency Economic Powers Act of 1977 Export Administration Act of 1979 Several laws specifically prohibit trade with certain countries:
== Further reading == Kishi, K.; Okabe, K.; Shimizu, R.; Kubota, Y. (2012). "Fetal Skin Possesses the Ability to Regenerate Completely: Complete Regeneration of Skin". The Keio Journal of Medicine. 61 (4): 101–108. doi:10.2302/kjm.2011-0002-ir. PMID 23324304.
=== Pharmacodynamics === Thiobuscaline shows affinity for the serotonin 5-HT2A receptor (Ki = 602 nM). It is a potent near-full agonist of the serotonin 5-HT2A and 5-HT2C receptors and to a much lesser extent a moderate-efficacy partial agonist of the serotonin 5-HT2B receptor, with EC50Tooltip half-maximal effective concentration (EmaxTooltip maximal efficacy) values of 3.86 nM (114%) at the serotonin 5-HT2A receptor, 89.6 nM (55.7%) at the serotonin 5-HT2B receptor, and 8.86 nM (95.9%) at the serotonin 5-HT2C receptor. Conversely, it was inactive as an agonist of the serotonin 5-HT1A receptor. The drug produces the head-twitch response, a behavioral proxy of psychedelic effects, in rodents.
Sources: en.wikipedia.org
== University of Toronto == Despite its initial reservations centred upon Robertson's apparent "commercial leanings" (and, specifically, his decision to patent "tethelin"), and following "an unusually careful review process", the University of Toronto appointed Robertson as Professor in the Department of Biochemistry in 1918. He moved to Toronto, accompanied by Hardolph Wasteneys, who later became the head of the Toronto Department from 1929 to 1951. Robertson resigned in 1919, in order to take up his position at the University of Adelaide, and was succeeded, at Toronto, by Professor Andrew Hunter, C.B.E., F.R.S.C., F.R.S.E. (1876–1969).
==== Lipolysis ==== Numerous studies have shown that SCFAs and FFAR2-activating drugs inhibit the lipolysis (i.e., enzymatic hydrolytic breakdown of cellular triglycerides into their component fatty acids and glycerol) in mice and their cultured fat cells. For example: acetic and propionic acids inhibited lipolysis in mice (as defined by reducing their fatty acid blood levels) as well as their isolated cultured fat cells but did not do so in Ffar2 gene knockout mice or their isolated fat cells. There have been very few studies on FFAR2 and lipolysis in humans. Two studies reported that acetic acid suppressed fatty acid blood levels in humans but did not determine if this effect involved FFAR2. Note that in a mouse model of severe stress, i.e., starvation, FFAR2 activation stimulated lipolysis (see next section on Ketogenesis and ketoacidosis). FFAR2 appears to have very different effects on lipolysis in mice depending on their energy conditions and nutritional status. While SCFAs and FFAR2 have been suggested to stimulate lipolysis in humans on low glucose diets (study described in section on Ketogenesis and ketoacidosis), the role of FFAR2 in this stimulation is unclear and requires further study.
=== Pharmacokinetics === Glycopyrronium bromide affects the gastrointestinal tract, liver and kidney but has a very limited effect on the brain and the central nervous system. In horse studies, after a single intravenous infusion, the observed tendencies of glycopyrronium followed a tri-exponential equation, by rapid disappearance from the blood followed by a prolonged terminal phase. Excretion was mainly in urine and in the form of an unchanged drug. Glycopyrronium has a relatively slow diffusion rate, and in a standard comparison to atropine, is more resistant to penetration through the blood-brain barrier and placenta.
Sources: en.wikipedia.org
=== Sepsis === Measurement of procalcitonin can be used as a marker of severe sepsis caused by bacteria and generally grades well with the degree of sepsis, although levels of procalcitonin in the blood are very low. PCT has the greatest sensitivity (90%) and specificity (91%) for differentiating patients with systemic inflammatory response syndrome (SIRS) from those with sepsis, when compared with IL-2, IL-6, IL-8, CRP and TNF-alpha. Evidence is emerging that procalcitonin levels can reduce unnecessary antibiotic prescribing to people with lower respiratory tract infections. Currently, procalcitonin assays are widely used in the clinical environment. A meta-analysis reported a sensitivity of 76% and specificity of 70% for bacteremia. A 2018 systematic review comparing PCT and C-reactive protein (CRP) found PCT to have a sensitivity of 80% and a specificity of 77% in identifying septic patients. In the study, PCT outperformed CRP in diagnostic accuracy of predicting sepsis. In a 2018 meta-analysis of randomized trials of over 4400 ICU patients with sepsis, researchers concluded that PCT led therapy resulted in lower mortality and lower antibiotic administration.
== Release == The film premiered at the 62nd Cannes Film Festival on 18 May 2009, and went on to screen at festivals such as the Toronto International Film Festival and the Maryland Film Festival. It was released in Greece on 11 November 2009 by Feelgood Entertainment. Verve Pictures acquired distribution rights for the United Kingdom and released it on 23 April 2010. Kino International released it in the United States on 25 June 2010.
== Uses == The dominant use of potassium sulfate is as a fertilizer. K2SO4 does not contain chloride, which can be harmful to some crops. Potassium sulfate is preferred for these crops, which include tobacco and some fruits and vegetables. Crops that are less sensitive may still require potassium sulfate for optimal growth if the soil accumulates chloride from irrigation water. The crude salt is also used occasionally in the manufacture of glass. Potassium sulfate is also used as a flash reducer in artillery propellant charges. It reduces muzzle flash, flareback and blast overpressure. It is sometimes used as an alternative blast media similar to soda in soda blasting as it is harder and similarly water-soluble. Potassium sulfate can also be used in pyrotechnics in combination with potassium nitrate to generate a purple flame. A 5% solution of potassium sulfate was used in the beginning of the 20th century as a topical mosquito repellent.
=== Voting === Voting for the host was open to 203 FIFA member associations. The United bid won with 134 votes, while the Morocco bid received 65 votes. Iran voted for neither of the two bids, while Cuba, Slovenia, and Spain abstained from voting. Ghana had been suspended by FIFA for corruption and was therefore ineligible to vote. Morocco was later selected as a co-host of the 2030 FIFA World Cup, alongside Portugal, Spain, Argentina, Paraguay, and Uruguay.
Sources: en.wikipedia.org
It is associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.
Peptidases degrade the compound within minutes in circulation. This short half-life is one reason nasal delivery is used, placing the substance close to the olfactory and trigeminal pathways.
No large multicenter trials have been published in English-language journals. The existing human evidence consists mainly of smaller studies conducted in Russia, which limits generalization.
It consists mainly of animal experiments and small clinical reports, with much of the clinical material published in Russian-language journals. Large independent trials are scarce. Separating reliable effects from chance findings is consequently difficult.