If you have been reading about BDNF expression 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 2025-09-09. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| 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.
The earliest buildings, such as Indianapolis White Castle #3, built in 1927, had exteriors of white enamel-glazed brick and interiors of enameled steel. The Indianapolis unit was in operation until 1979, making it, at the time of its closure, the longest-operating fast food restaurant in the country. The company constructed this style of building from 1924 to 1929. White Castle Building No. 8 in Minneapolis, Minnesota, originally built in 1936 and remodeled, is an example of the chain's buildings with prefabricated white porcelain enamel on steel exteriors. The building measured 28 feet (8.5 m) by 28 feet (8.5 m) and was designed to resemble the Chicago Water Tower, with octagonal buttresses, crenelated towers, and a parapet wall. The success of White Castle led to numerous imitators. Restaurants copied the distinctive architecture of White Castle buildings, as well as created confusion for consumers by using a similar name. The first of these imitators in Wichita was Little Kastle. Many competitors created their names with a play on the White Castle name. Some restaurant chains just replaced the word "Castle" with their own word (Cabin, Cap, Clock, Crescent, Diamond, Dome, Fortress, Grille, House, Hut, Kitchen, Knight, Log, Manna, Mill, Palace, Plaza, Shop, Spot, Tavern, Tower, Turret, Wonder), while others chose to replace "White" with another color or adjective (Blue, King's, Little, Magic, Modern, Prince's, Red, Royal, Silver). Some of the other imitators included Castle Blanca, Blue Beacon, Blue Bell, Blue Tower, Krystal, Red Barn, Red Lantern, and Klover Kastle.
==== Preventive trials ==== Failure of several drugs in Phase III clinical trials has led to AD prevention and early intervention for onset AD treatment endeavours. Passive anti-Aβ mAb treatment can be used for preventive attempts to modify AD progression before it causes extensive brain damage and symptoms. Trials using mAb treatment for patients positive for genetic risk factors, and elderly patients positive for indicators of AD are underway. This includes anti-AB treatment in Asymptomatic Alzheimer's Disease (A4), the Alzheimer's Prevention Initiative (API), and DIAN-TU. The A4 study on older individuals who are positive for indicators of AD but are negative for genetic risk factors will test Solanezumab in Phase III Clinical Trials, as a follow-up of previous Solanezumab studies. DIAN-TU, launched in December 2012, focuses on young patients positive for genetic mutations that are risks for AD. This study uses Solanezumab and Gautenerumab. Gautenerumab, the first fully human MAB that preferentially interacts with oligomerized Aβ plaques in the brain, caused significant reduction in Aβ concentration in Phase I clinical trials, preventing plaque formation and concentration without altering plasma concentration of the brain. Phase II and III clinical trials are currently being conducted.
== Industrial production == Four large pharmaceutical companies, Monsanto, American Cyanamid, Eli Lilly, and Upjohn, developed commercial rBST products and submitted them to the US Food and Drug Administration (FDA) for approval. Monsanto was the first firm to receive approval; it has been sold in the USA since February 3, 1994. Other countries (Mexico, Brazil, India, Russia, and at least ten others) also approved rBST for commercial use. Monsanto licensed Genentech's patent and marketed their product as "Posilac". In October 2008, Monsanto sold this business, in full, to Eli Lilly and Company for $300 million plus additional consideration.
== Bibliography == Barkawi, Tarak (April 2006). "Culture and Combat in the Colonies: The Indian Army In the Second World War". Journal of Contemporary History. 41 (2). Sage: 325–355. doi:10.1177/0022009406062071. S2CID 145364543. Barthorp, Michael (2002). Afghan Wars and the North-West Frontier 1839–1947. London: Cassel. ISBN 0-304-36294-8. Barua, Pradeep (2003). Gentlemen of the Raj: The Indian Army Officer Corps, 1817–1949. Westport, CT: Praegar. ISBN 0275979997. Chandler, David (2002). Oxford History of the British Army (2nd ed.). USA: Oxford University Press. ISBN 0192803115. Gaylor, John (1996). Sons of John Company – The Indian & Pakistan Armies 1903–1991. Tunbridge Wells, Kent: Parapress. ISBN 1-898594-41-4. Haythornthwaite, P.J. (1992). The World War One Sourcebook. Arms and Armour Press. Heathcote, T. A. (1974). The Indian Army – The Garrison of British Imperial India, 1822–1922. Newton Abbot, Devon: David & Charles. Ilbert, Courtenay (1 January 1913). "British India". Journal of the Society of Comparative Legislation. 13 (2): 327–333. JSTOR 752287. Imperial Gazetteer of India, Volume IV (1908). Indian Empire: Administrative. Oxford: Clarendon Press. p. 552. Jackson, Donovan (1940). India's Army. London: Sampson Low. Lapping, Brian (1985). End of Empire. London: Guild Publishing. Mazumder, Rajit K. (2003). The Indian army and the making of Punjab. Delhi, India: Permanent Black. ISBN 8178240599. Nathan, R.; Lee-Warner, William; Carnduff, H. W. C.; Maclagan, E. D.; Walker, G. H. D.; Collen, Edwin; Nathan; Bythel, W. J.; Hemming, T. H. (1908).
Sources: en.wikipedia.org
Further reading Granger, JP; Alexander, BT; Llinas, M (2002). "Mechanisms of pressure natriuresis". Current Hypertension Reports. 4 (2): 152–9. doi:10.1007/s11906-002-0040-3. PMID 11884271. S2CID 46323264. Hall, J. E.; Mizelle, H. L.; Hildebrandt, D. A.; Brands, M. W. (1990). "Abnormal pressure natriuresis. A cause or a consequence of hypertension?". Hypertension. 15 (6_Pt_1): 547–59. doi:10.1161/01.HYP.15.6.547. PMID 1971810.
After King Ferdinand I’s death in 1383, his minor daughter Beatrice became his legal successor under the regency of Leonor Teles. Leonor's unpopularity triggered a crisis compounded by fears that the marriage between Beatrice and John I of Castile could lead to the loss of Portugal's independence. In 1385, John of Aviz, a royal bastard and brother of Ferdinand, was elected king and later defeated the Castilians in the Battle of Aljubarrota consolidating the House of Aviz's rule over the country. In 1386, during his reign, Portugal cemented its alliance with England with the signing of the Treaty of Windsor, making it the oldest standing alliance in the world. The dynasty contributed to the conditions for Portugal's maritime expansion, elevating it in European politics and culture. Portugal acquired its first colonies by conquering Ceuta in North Africa in 1415. Portugal was among the first to start the Age of Discovery, and its scientific advances influenced other European countries' overseas expansions. Portugal was the first and the last colonial power in the era of modern European colonialism, and by the mid-16th century it controlled a network of possessions stretching from Lisbon to Japan and Timor through Brazil.
The flowers may be arranged along the stem, developing from the base, as a single flower at the tip of the stem, or as a cluster of flowers. They contain both male (androecium) and female (gynoecium) characteristics and are symmetric radially, but sometimes as a mirror image. Most flowers are large and colourful, except for Medeoleae. Both the petals and sepals are usually similar and appear as two concentric groups (whorls) of 'petals', that are often striped or multicoloured, and produce nectar at their bases. The stamens are usually in two groups of three (trimerous) and the pollen has a single groove (monosulcate). The ovary is located above the attachment of the other parts (superior). There are three fused carpels (syncarpus) with one to three chambers (locules), a single style and a three-lobed stigma. The embryo sac is of the Fritillaria type. Usually indeterminate (lacking terminal flower) as a raceme (Lilium); sometimes reduced to a single terminal flower (Tulipa). When pluriflor (multiple blooms), the flowers are arranged in a cluster or rarely are subumbellate (Gagea) or a thyrse (spike). The flowers are hermaphroditic, actinomorphic (radially symmetric) or slightly zygomorphic (bilaterally symmetric), pedicellate (on a short secondary stem), generally large and showy but may be inconspicuous (Medeoleae). The bracts may (bracteate) or may not (ebracteate) be present.
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.