This is a working overview of BDNF, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-08-03. Anything still debated is marked as such rather than presented as settled.
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.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
| Property | Value | Notes |
|---|---|---|
| Purity assay | RP-HPLC, UV 214 nm | Typical research grade 95 percent or higher |
| Mass confirmation | ESI-MS or MALDI-TOF | Compared with theoretical value |
| Main degradation route | Methionine oxidation | Sulfoxide formation in solution |
| Powder storage | -20 °C, desiccated | Amber vial, minimal headspace |
| Working solution | Sterile water or saline | Prepare fresh; avoid repeated thawing |
Identity and purity are established with standard peptide methods. Reversed-phase HPLC with ultraviolet detection near 214 nm resolves the parent peak from deletion and truncation byproducts, and reports typically quote a main-peak percentage. Mass spectrometry by electrospray or MALDI-TOF confirms the expected molecular mass, while amino acid analysis or peptide mapping can verify composition when the sequence itself is in question. A certificate of analysis that pairs a chromatogram with a mass spectrum is more informative than a purity figure alone. Counter-ion content and residual solvents are separate specifications and are frequently omitted.
Semax is normally supplied as a lyophilized powder, and that form is the most stable. Suppliers commonly recommend storage at -20 °C in a desiccated container protected from light, with short-term handling at room temperature limited to weighing and transfer. Powder that has absorbed moisture degrades faster, so vials should be warmed to ambient temperature before opening to prevent condensation on the contents. Hygroscopic behavior is typical of short hydrophilic peptides, and humidity control matters more than temperature alone for long-term retention.
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
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.
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.
A wound in the lateral nasal wall that is greater than 15 mm in diameter can also be corrected with a superiorly based, nasolabial-flap, which is especially suited for correcting distal defects that lay among the convexities of the nasal tip and the alar lobule. The nasolabial flap can correct defects that comprehend the distal two-thirds of the nose, if there is a supply of skin sufficient for constructing the base of the flap pedicle; and the donor sites cannot be closed primarily. Yet, bulkiness is the principal disadvantage of the nasolabial flap—except in elderly patients with atrophic cheek skin; nonetheless, it is technically effective for patients unsuitable for a two-stage rhinoplasty with a paramedian forehead flap. Nasal defects involving either the bone or the cartilage of the lateral nose are best managed with free grafts of flat septal bone and of cartilage. Small defects of the nasal dorsum can be covered with cartilage grafts harvested from either the septum or the concha of the ear. The correction of large-area defects of the nasal dorsum requires the stable support of a bone graft affixed either with a lag screw or with a low-profile plate. A costal graft (from the rib cage) is ideal for such a repair, because it can be harvested with an attached extension of cartilage that can be sculpted to blend into the nasal tip; other potential donor sites for nasal dorsum reconstruction materials are the outer table of the skull, the iliac crest, and the inner table of the ilium proper.
CD38-IN-78c is a drug which acts as a potent and selective inhibitor of the glycoprotein enzyme CD38. In animal studies it boosts levels of nicotinamide adenine dinucleotide (NAD+) in tissues via inhibition of CD38 mediated breakdown of nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN), and has been shown to ameliorate metabolic dysfunction associated with the aging process. It also has potential therapeutic application in the treatment of Alzheimer's disease.
The Transitional Federal Government sought to reestablish its authority, and, with the assistance of Ethiopian troops, African Union peacekeepers and air support by the United States, drove out the ICU and solidified its rule. On 8 January 2007, TFG President Abdullahi Yusuf Ahmed entered Mogadishu with the Ethiopian military support for the first time since being elected to office. The government then relocated to Villa Somalia in the capital from its interim location in Baidoa. This marked the first time since the fall of the Siad Barre regime in 1991 that the federal government controlled most of the country.
== Further reading == Tropane Alkaloid Poisoning on eMedicine Krenzelok, Edward P. (February 2010). "Aspects of poisoning and treatment". Clinical Toxicology. 48 (2): 104–110. doi:10.3109/15563651003630672. PMID 20229618. S2CID 28433567. Rätsch, C. (2005) [1998]. The Encyclopedia of Psychoactive Plants. Rochester, VT: Park Street Press. ISBN 978-0-89281-978-2. Archived from the original on 22 August 2013. Retrieved 9 September 2017. Roblot, F; Montaz, L; Delcoustal, M; Gaboriau, E; Chavagnat, JJ; Morichaud, G; Pourrat, O; Scepi, M; Patte, D (1995). "Intoxication par Datura stramonium: Le diagnostic est clinique, le traitement est symptomatique" [Datura stramonium poisoning: the diagnosis is clinical, treatment is symptomatic]. La Revue de Médecine Interne (in French). 16 (3): 187–90. doi:10.1016/0248-8663(96)80689-8. PMID 7740228.
== Dialysis modality == Hemodialysis (HD): Used by ~88% of patients; 5-year survival ~40%. Higher early mortality from urgent starts. Peritoneal dialysis (PD): Better early survival due to home-based flexibility; outcomes equalize after 2–3 years. May improve quality of life short-term. Exceptional cases survive 20–30+ years with optimal care.
Sources: en.wikipedia.org
However, though the Huks fought the Japanese, they also "tried to thwart United States Army Forces in the Far East guerrillas", "therefore, they were considered disloyal and were not accorded U.S. recognition or benefits at the end of the war."
Selenoprotein I (SELENOI/EPT1), a CDP-ethanolamine:diacylglycerol ethanolamine-phosphotransferase. Selenoprotein K and Selenoprotein S are small transmembrane proteins found on the ER menbrane. Selenoprotein M and Selenoprotein F, thioredoxin-like proteins found in the endoplasmic reticulum (ER). Selenoprotein N, a large transmembran proteins found on the ER menbrane. Selenoprotein O, protein found in the mitochondrial, probably with a redox function. Selenoprotein P is an extracellular glycoprotein, unusually with more than one Sec residue (usually several), found in eukaryotes including humans. The precise number of residues vary and appears linked to the selenium needs of the organism. Selenoprotein R (MSRB1) is a peptide-methionine (R)-S-oxide reductase. It has two non-selenoprotein relatives in humans, also of the same catalytic activity. Families only existing as non-seleno-proteins in mammals:
== 23S rRNA Helix 26a == The 23S ribosomal RNA is composed of six domains forming a complex network of molecular interactions. A central single-stranded region connects all of the domains through base-pairing of the two halves, forming Helix 26a. Some consider Helix 26a to be Domain 0 due to its action as a central core and compact folding unit. Comparison of 23S and 28S ribosomal RNA sequences across species demonstrate conservation of Helix 26a. Helices continue to provide the support as the backbone of domain architecture.
== Sponsorships == Culver's sponsors sports teams, including the Wisconsin Intercollegiate Athletic Conference (WIAC), Wisconsin Badgers, Minnesota Golden Gophers, Madison Mallards, Milwaukee Brewers, Milwaukee Bucks, Green Bay Packers, American Family Insurance Championship, Culver's Cup Hockey Tournament, Jeff Trickey QB Camps, Isthmus Bowl, and Wisconsin Junior Boys & Girls Golf Championships. Culver's also sponsors the WIAC baseball championship. The company sponsored the movie Green and Gold in 2025.
== Flavour == Pepper gets its spicy heat mostly from piperine derived from both the outer fruit and the seed. Black pepper contains between 4.6 and 9.7% piperine by mass, and white pepper slightly more than that. Refined piperine, by weight, is about one percent as hot as the capsaicin found in chilli peppers. The outer fruit layer, left on black pepper, also contains aroma-contributing terpenes, including germacrene (11%), limonene (10%), pinene (10%), alpha-phellandrene (9%), and beta-caryophyllene (7%), which give citrusy, woody, and floral notes. These scents are mostly missing in white pepper, as the fermentation and other processing removes the fruit layer (which also contains some of the spicy piperine). Other flavours also commonly develop in this process, some of which are described as off-flavours when in excess: Primarily 3-methylindole (pig manure-like), 4-methylphenol (horse manure), 3-methylphenol (phenolic), and butyric acid (cheese). The aroma of pepper is attributed to rotundone (3,4,5,6,7,8-Hexahydro-3α,8α-dimethyl-5α-(1-methylethenyl)azulene-1(2H)-one), a sesquiterpene originally discovered in the tubers of Cyperus rotundus, which can be detected in concentrations of 0.4 nanograms/l in water and in wine: rotundone is also present in marjoram, oregano, rosemary, basil, thyme, and geranium, as well as in some Shiraz wines.Pepper loses flavour and aroma through evaporation, so airtight storage helps preserve its spiciness longer. Pepper can also lose flavour when exposed to light, which can transform piperine into nearly tasteless isochavicine.
Sources: en.wikipedia.org
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.
The main chemical risks are methionine oxidation and backbone hydrolysis in solution. Moisture and repeated temperature cycling accelerate both processes. Dry powder held cold and desiccated is considerably more stable than any reconstituted preparation.
It holds a medicine registration in Russia, where it has been used clinically for decades. In most other countries it is treated as a research chemical. That split explains the uneven distribution of clinical literature.
It is registered as a pharmaceutical product in Russia, where it is typically supplied as a nasal solution. In most other countries it is not an approved drug and is traded as a research chemical instead. Approval status depends entirely on the jurisdiction involved.