intranasal delivery comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2025-10-22. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Identity and purity of Semax are established mainly by reversed-phase high-performance liquid chromatography coupled with mass spectrometry. The chromatographic trace gives a purity estimate as a percentage of total peak area, while electrospray or matrix-assisted laser desorption ionization confirms the molecular mass against the calculated value. Amino acid analysis and sequence-specific fragmentation provide further confirmation when a supplier's chain of custody is unclear. Vendors frequently quote a purity figure without stating the detection wavelength or the integration method, which limits how far one number can be compared with another.
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
Practical handling follows from those properties. Bulk material is best divided into single-use portions soon after receipt, because each thaw exposes the whole container to moisture and temperature cycling. Vials should be allowed to reach room temperature before opening to prevent condensation on the powder. Low-binding plasticware reduces loss of dilute solutions, and sterile filtration is used when a preparation must remain free of microbial growth. Records of batch number, reconstitution date and storage history are what allow a later analytical result to be interpreted meaningfully.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilized solid from research suppliers |
| Solubility | Freely soluble in water | Also dissolves in aqueous buffers; solutions are used fresh |
| Typical storage temperature | -20 °C for lyophilized powder | Short-term transport at 2-8 °C is common |
| Common analytical method | Reverse-phase HPLC | Paired with mass spectrometry for identity confirmation |
| Common synonyms | ACTH(4-10) analogue; MEHFPGP | N-terminal methionine retained in the chain |
In Belgium, four patients with severe musculoskeletal infections received bacteriophage therapy with concomitant antibiotics. After a single course of phage therapy, no recurrence of infection occurred and no severe side-effects related to the therapy were detected.
Naegleria fowleri, a thermophilic and free-living amoeba, is primarily found in warm and hot freshwater environments such as ponds, lakes, rivers, hot springs, and poorly maintained swimming pools. As temperatures rise, its population tends to increase. Although the amoeba was initially identified in Australia in the 1960s, it is believed to have evolved in the United States. N. fowleri exists in three forms - cyst, trophozoite (ameboid), and biflagellate. While it does not form cysts in solid human tissue, where only the amoeboid trophozoite stage is present, the flagellate form has been discovered in cerebrospinal fluid.
== Immunomodulation == In addition to killing bacteria directly they have been demonstrated to have a number of immunomodulatory functions that may be involved in the clearance of infection, including the ability to alter host gene expression, act as chemokines and/or induce chemokine production, inhibiting lipopolysaccharide induced pro-inflammatory cytokine production, promoting wound healing, and modulating the responses of dendritic cells and cells of the adaptive immune response. Animal models indicate that host defense peptides are crucial for both prevention and clearance of infection. It appears as though many peptides initially isolated as and termed "antimicrobial peptides" have been shown to have more significant alternative functions in vivo (e.g. hepcidin). Dusquetide for example is an immunomodulator that acts through p62, a protein involved in toll like receptor based signalling of infection. The peptide is being examined in a Phase III clinical trial by Soligenix (SGNX) to ascertain if it can assist in repair of radiation-induced damage to oral mucosa arising during cancer radiotherapy of the head and neck.
Sources: en.wikipedia.org
== Structure == Collagen XVII is a homotrimer of three alpha1(XVII)-chains and a transmembrane protein in type II orientation. Each 180 kD a-chain contains a globular intracellular domain of approximately 70 kDa, which interacts with beta4-integrin, plectin, and BP230 and is necessary for the stable attachment of hemidesmosomes to keratin intermediate filaments. The large C-terminal ectodomain with a molecular mass of approximately 120 kDa consists of 15 collagenous subdomains, characterized by typical collagenous G-X-Y repeat sequences, flanked by 16 short non-collagenous stretches. The overall structure of the ectodomain is that of a flexible, rod-like triple helix with a significant thermal stability. The membrane proximal part of the ectodomain, within amino acids 506-519, is responsible for binding to alpha 6 integrin, this binding seems to be important for the collagen XVII integration into hemidesmosomes . The largest collagenous domain, Col15, which contains 232 amino acids (amino acids 567-808), contributes significantly to stability of collagen XVII homotrimer. The C-terminus of collagen XVII binds to laminin 5, and correct integration of laminin 5 into the matrix requires collagen XVII.
=== Early years (2007–2017) === Thechineseroom's first three projects were two mods for Half-Life 2, named Antlion Soccer and Dear Esther, and a Doom 3 mod, Conscientious Objector. The modding project was backed by the Arts and Humanities Research Council. Of these, Dear Esther became a cult hit. In 2009, Thechineseroom developed Korsakovia, which was a survival horror mod. After Korsakovia, Thechineseroom worked with Robert Briscoe to develop a remake of Dear Esther, this time as a full-fledged video game, distributed through Valve's Steam distribution service. This stand-alone version of the mod received several IGF nominations, such as the Seamus McNally Grand Prize, Excellence in Visual Arts and Audio, and the Nuovo Award. It finally won for Excellence in Visual Art. The remake featured improved graphics, but was based on the same engine as the previous mods, Source. The game was released in early 2012 and reached 50,000 copies sold within one week. In February 2012, Thechineseroom announced that they began development on Amnesia: A Machine for Pigs, a survival horror game and indirect sequel to Amnesia: The Dark Descent. This project was produced by the makers of the original game, Frictional Games. Thechineseroom also began work on their newest game, Everybody's Gone to the Rapture alongside the development of Amnesia: A Machine for Pigs. During that time, on 11 June 2013, they renamed themselves to the Chinese Room, introducing a new logo. The studio team partnered with Santa Monica Studio to produce Everybody's Gone to the Rapture.
== History == In 1991, Merck & Co's simvastatin was approved as an HMG-COA inhibitor to lower the levels of LDL cholesterol. In 2006, Merck & Co's sitagliptin was approved by the FDA for treatment of diabetes mellitus type 2.
=== Child soldiers and human shields === Houthis have been accused of violations of international humanitarian law, such as using child soldiers, shelling civilian areas, forced evacuations and executions. According to Human Rights Watch, Houthis intensified their recruitment of children in 2015. UNICEF mentioned that children with the Houthis and other armed groups in Yemen comprise up to a third of all fighters in Yemen. Human Rights Watch has further accused Houthi forces of using landmines in Yemen's third-largest city of Taizz, which has caused many civilian casualties and prevented the return of families displaced by the fighting. HRW has also accused the Houthis of interfering with the work of Yemen's human rights advocates and organizations. In 2009, HRW researcher Christoph Wilcke said that although the Republic of Yemen Government accused the Houthis of using civilians as human shields, HRW did not have enough evidence to conclude that the Houthis were intentionally doing so. Nonetheless, Wilcke stated that there may have been cases in which HRW was unable to document. Akram Al Walidi, one of four journalists detained by the Houthis on spying charges and then released in April 2023 as part of a prisoner exchange deal between the former and the internationally recognized government of Yemen, said he felt like the four were human shields after the Houthis moved them to one of their military camps at Sanaa in October 2020 since it was an expected target of Saudi airstrikes.
Sources: en.wikipedia.org
== Pharmacological properties == Oripavine possesses an analgesic potency comparable to morphine; however, it is not clinically useful due to severe toxicity and low therapeutic index. In both mice and rats, toxic doses caused tonic-clonic seizures followed by death, similar to thebaine. Oripavine has a potential for dependence which is significantly greater than that of thebaine but slightly less than that of morphine.
=== Androgenic and antiandrogenic activity === The binding and activity of progesterone at the androgen receptor (AR), the biological target of androgens like testosterone and dihydrotestosterone (DHT) in the body, is controversial. Some studies have found progesterone to bind to the AR, with agonistic and antagonistic activity exerted, whereas other studies have found very low or no affinity for the AR at all. In animal studies, no androgenic effects have been observed, but weak antiandrogenic effects have been reported. The weak antiandrogenic activity has been attributed not to antagonism of the AR by progesterone, but rather to its weak 5α-reductase inhibition and consequent inhibition of the conversion of testosterone into the more potent DHT. There is no clinical evidence of AR-mediated androgenic or antiandrogenic activity with progesterone. Progesterone has not been associated with any classical androgenic effects in clinical studies in women, including no changes in the blood lipid profile or sex hormone-binding globulin levels, acne, oily skin, hirsutism, or voice deepening, nor with virilization of female fetuses. As such, the scientific consensus is that progesterone is clinically neither androgenic nor antiandrogenic.
=== Analysis === Northeastern University School of Law professor Alexandra Roberts argued that Twitter's claim that certain individuals paid for Twitter Blue may violate state and federal false representation laws, such as the Lanham Act, popularized through a retweet by dril, but reserved that Twitter was not making a direct advertisement. Solicitor Simon McGarr mentioned that Twitter's insistence on the blue checkmark for some users, such as dril, may violate the General Data Protection Regulation (GDPR) in the European Union, as verifying accounts requires a phone number. McGarr also noted Tolley v. Fry, a 1931 court case filed against chocolate bar manufacturer J. S. Fry & Sons by golfer Cyril Tolley alleging that the advertising of chocolate bars with a caricature of Tolley was defamatory, or the similar case Eddie Irvine v. Talksport between racing driver Eddie Irvine and sports radio station Talksport. Other scholars have cited the Federal Trade Commission Act of 1914, while some have pointed to the disdain for blue checkmarks and the potential effects of the checkmark on celebrities' reputations. The Federal Trade Commission (FTC) has not commented on Twitter Blue, although an anonymous former FTC official called it "deceptive". Following the initial implementation of paid verification, the Twitter account for the anti-vaccine propaganda film Died Suddenly (2022) became verified. The account has been used to spread medical misinformation, including of COVID-19 vaccines.
Sources: en.wikipedia.org
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.
A fraction of an intranasal dose is thought to reach the central nervous system, and this route is favoured partly for that reason. The proportion is not well characterized. Direct measurement in humans remains difficult with current methods.
Raised BDNF and NGF expression has been reported across several animal studies, which makes the signal fairly consistent. Whether the same change occurs in humans at usable doses is not established. It is best treated as a working hypothesis rather than a confirmed clinical mechanism.
Suppliers normally quote a percentage of total chromatographic peak area, most often from reversed-phase HPLC. That figure says nothing about what the remaining percentage contains, and it depends on the detection wavelength used. A mass spectrometry result is a separate and stronger check on identity.