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Background And Development — Beginner to Advanced

By Editorial Desk · published 2026-04-29 · last reviewed 2026-05-14 · Blog

ACTH analog raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.

This page was last updated on 2026-05-14 and is reviewed periodically as new material appears.

Background and Development

Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.

Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.

Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.

Semax Structure and Research Background

Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.

Clinical evidence consists largely of small trials with modest sample sizes, often without independent replication. Reported endpoints include cognitive scores, recovery after stroke, and visual function, but study designs vary widely and few trials meet contemporary reporting standards. Systematic reviewers have noted a high risk of bias in several of these reports. No large multicenter trial conducted outside Russia has been published. The compound is therefore best described as investigational in most jurisdictions, with its clinical role still unresolved.

Semax at a glance

PropertyValueNotes
Molecular classSynthetic heptapeptideAnalog of an ACTH fragment
Amino acid lengthSeven residuesMet-Glu-His-Phe-Pro-Gly-Pro
OriginMoscow, 1980sInstitute of Molecular Genetics
Approved regionsRussia and some neighboring statesNot cleared in Western markets
Common trade namesMultiple national brandsSold as a nasal formulation

Semax Peptide Background and Identity

Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.

Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.

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Semax Origin and Molecular Structure

The compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.

Pharmacological accounts link semax to melanocortin signalling and to modulation of neurotrophic factor expression, particularly brain-derived neurotrophic factor and nerve growth factor. Much of this evidence comes from rodent studies using intranasal delivery, a route chosen because it allows peptides to reach the central nervous system with limited systemic exposure. Whether the same mechanisms operate in humans at comparable magnitude remains an open question. The precise receptor or receptors responsible for the reported behavioural and neuroprotective effects have not been conclusively identified.

Semax Background and Chemistry

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.

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.

Supporting material

=== Im Einsatz bei der Polarluftflotte === Am 13. Februar 1936 wurde bei einer Besprechung im Kreml, an der neben Josef Stalin unter anderem auch die Flieger Sigismund Lewanewski und Michail Gromow teilnahmen, von dem Arktisforscher Otto Schmidt die Einrichtung einer auf einer driftenden Eisscholle befindlichen Polarstation vorgeschlagen. Der Transport und die weitere Versorgung des Lagers sollten durch Flugzeuge erfolgen. Der Vorschlag wurde angenommen und die Hauptverwaltung Nördlicher Seeweg mit der Organisation betraut. Als Flugzeug sollte die TB-3, die eine große Nutzlast transportieren konnte, zum Einsatz kommen. Als Ausgangsbasis sollte die Rudolf-Insel dienen, auf der schon 1932 eine Wetterstation eingerichtet worden war. In der folgenden Zeit wurde bei der Station unter der Leitung von Iwan Papanin ein Flugplatz angelegt und neue Lager- und Wohngebäude nebst Werkstätten errichtet.

Im Werk Nr. 22 in Fili wurden vier speziell umgebaute ANT-6 (da die Flugzeuge zivil genutzt werden sollten, wurde die Werksbezeichnung verwendet) für die Polarluftflotte (Poljarnaja Awiazija) produziert. Sie waren den eisigen arktischen Verhältnissen angepasst. Die normalerweise offenen Pilotenkabinen erhielten aufgesetzte Kabinen, der untere Teil der Bugkanzel wurde nach vorn versetzt und schloss nun mit der Oberkante ab. Das Hauptfahrwerk wurde mit Kufen ausgerüstet, wobei die eigentlichen Haupträder mit zwei Metern Durchmesser unter dem Rumpf befestigt mitgeführt wurden. Die Lenkbarkeit am Boden wurde durch eine steuerbare Heckkufe verbessert. Als weitere Besonderheit erhielt jedes Flugzeug eine leistungsstarke Enteisungsanlage sowie einen 50 m² großen Bremsschirm im Heck, der die Landerollstrecke um die Hälfte reduzieren konnte und erstmals in der Geschichte der Luftfahrt Verwendung fand. Zusätzlich zur Bordfunkanlage wurde zur Kommunikation zwischen Pilot, Navigator und Funker noch eine Rohrpost installiert. Die Kennzeichen dieser vier Maschinen lauteten N-169 (Kommandant Ilja P. Mazuruk), N-170 (Michail W. Wodopjanow), N-171 (Wassili S. Molokow) und N-172 (Anatoli D. Alexejew). Der Buchstabe N kennzeichnete die Zuordnung zur Hauptverwaltung der Zivilluftflotte. Der Anstrich war in auffälligen orange-rot mit blau gehalten, um ein Auffinden bei Notlandungen im Eis zu erleichtern. Die verwendeten AM-34R-Motoren waren Spezialanfertigungen des Werkes Nr. 24 in Moskau für extrem niedrige Temperaturen und mit am Boden verstellbaren Dreiblatt-Metalluftschrauben ausgerüstet.

Die Erprobung der als ANT-6-4AM-34R bezeichneten Flugzeuge führte Jakow Moissejew durch. Bedingt durch die aerodynamisch sauberere Konstruktion erzielte die Arktisversion im Vergleich zur herkömmlichen TB-3 bessere Flugleistungen. Sie war in der Lage, 14 Stunden in der Luft zu bleiben, konnte fast 12.000 Kilogramm Nutzlast befördern, womit sie in Bodennähe immer noch eine Geschwindigkeit von 240 km/h erreichte.

Sources: de.wikipedia.org

Supporting material

Am 22. März 1937 begann der Verlegungsflug zur Rudolf-Insel, die jedoch wegen des extrem schlechten Wetters nach drei Zwischenlandungen mit Wartezeiten erst am 18. April erreicht wurde. Am 21. Mai 1937 schließlich landete das Führungsflugzeug mit Wodopjanow als Pilot am Pol und setzte die Expeditionsteilnehmer samt einem Teil der Ausrüstung ab. Die drei anderen ANT-6 landeten am 25. Mai beim Lager. Am 4. Juni wurde die Station Nordpol-1 durch Otto Schmidt eingeweiht und die Flugzeuge starteten zum Rückflug zur Rudolf-Insel. Wegen Treibstoffmangels musste die N-172 mit Anatoli D. Alexejew auf dem Eis notlanden, konnte aber, nachdem eine PS-7 (Pilot Pawel G. Golowin) Nachschub eingeflogen hatte, am 9. Juni ebenfalls zum Basislager fliegen. Die N-169 mit der Besatzung von Ilja P. Mazuruk wurde auf der Insel zur weiteren Versorgung der Expedition stationiert, die anderen Maschinen flogen zurück nach Moskau, wo sie am 25. Juni 1937 eintrafen. Im darauffolgenden Jahr nahm Wodopjanow mit seiner ANT-6 am 18. August 1938 an der alljährlichen Flugschau in Tuschino teil. Eine zweite, kleinere Expedition wurde ab dem 5. März 1941 durchgeführt. Die schon bei der Papanin-Expedition eingesetzte N-169 flog unter dem Kommando von I. I. Tscherewitschni mit einer Gruppe von Wissenschaftlern in Richtung Arktis, um die regelmäßige Durchführbarkeit von Versorgungsflügen für Arktisstationen zu testen. Ausgangsbasis war diesmal die Wrangelinsel. Zwischen dem 2. und 29. April 1941 flog die ANT-6 insgesamt dreimal driftende Eisschollen am Pol an und setzte Forscher darauf ab.

Sources: de.wikipedia.org

Frequently asked questions

Where was Semax developed?

It originated at the Institute of Molecular Genetics in Moscow during the 1980s. The work was carried out by a Russian research group that specialized in peptide neuropharmacology.

Is Semax an approved medication anywhere?

It is registered as a medicine in Russia and has been used clinically there for decades. No regulatory agency in Western Europe or North America has approved it for any indication.

What is the relationship to ACTH?

Semax corresponds to the four-to-ten fragment of adrenocorticotropic hormone. Because it omits the first three residues, it lacks the adrenal-stimulating action of the full hormone.

What is semax?

Semax is a synthetic seven-amino-acid peptide derived from a fragment of corticotropin. It is used in Russia as a nasal preparation, while elsewhere it is studied as a research compound. It is not approved as a medicine in most countries.

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