Semax (20mg vials)

Semax

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Peptide Partners Manufacturer Id: WF03

Batch Id: SX202603

Research Studies

(for educational purposes only)

Semax, an Analogue of Adrenocorticotropin (4–10), Binds Specifically and Increases Levels of Brain-Derived Neurotrophic Factor Protein in Rat Basal Forebrain

Authors: Oleg V. Dolotov, Ekaterina A. Karpenko, Tamara S. Seredenina, Lyudmila S. Inozemtseva, Natalia G. Levitskaya, Yuriy A. Zolotarev, Andrey A. Kamensky, Igor A. Grivennikov, Jürgen Engele, Nikolay F. Myasoedov

Published: Journal of Neurochemistry, Volume 97, Supplement 1, pp. 82–86, May 2006

URL: https://pubmed.ncbi.nlm.nih.gov/16635254/

Scientific Summary

The study investigated whether intranasal Semax affects BDNF (brain-derived neurotrophic factor) protein levels in vivo in the rat basal forebrain and whether specific binding sites for the peptide exist. Researchers administered Semax intranasally at 50 and 250 μg/kg body weight to rats and analyzed BDNF levels using sandwich immunoenzymatic (ELISA) analysis in the basal forebrain and cerebellum at 3 and 24 hours post-administration. Radioligand binding assays using [³H]-labeled Semax were performed on plasma membranes from basal forebrain tissue. Scatchard plot analysis of [³H]Semax binding revealed specific, saturable binding sites on basal forebrain plasma membranes, with Kd in the nanomolar range. The study found that Semax produced a rapid, dose-dependent increase in BDNF protein levels at 3 hours post-administration in the basal forebrain, but not in the cerebellum, demonstrating regional specificity. The effect was transient and not observed at 24 hours. This was the first demonstration that Semax binds to specific sites in the brain and increases BDNF protein—a potent modulator of synaptic plasticity—providing a molecular mechanism for its documented nootropic and neuroprotective effects.

Plain English Interpretation

This research investigated how Semax interacts with the brain after being administered through the nose, which is how it’s typically used. Scientists gave rats Semax at two different doses and then measured levels of BDNF—a protein that acts like fertilizer for brain cells, helping them grow, form new connections, and survive under stress. They focused on two brain areas: the basal forebrain (important for memory and attention) and the cerebellum (involved in movement coordination). The results showed that Semax rapidly increased BDNF levels in the basal forebrain within 3 hours, and the effect was dose-dependent—more Semax meant more BDNF. Importantly, this effect was specific to the basal forebrain and didn’t happen in the cerebellum, suggesting Semax targets brain regions most relevant to cognition. The researchers also discovered that Semax binds to specific “docking stations” on brain cell membranes, meaning it doesn’t just float around randomly—it has a targeted mechanism of action. This is significant because BDNF is one of the most important molecules for learning, memory formation, and protecting brain cells from damage. The findings help explain why Semax has shown cognitive-enhancing effects in research: by boosting BDNF in memory-critical brain regions, it supports the biological infrastructure that underlies learning and mental performance.

Semax, an ACTH(4-10) Analogue with Nootropic Properties, Activates Dopaminergic and Serotoninergic Brain Systems in Rodents

Authors: Kirill O. Eremin, Vladimir S. Kudrin, Pirjo Saransaari, Simo S. Oja, Igor A. Grivennikov, Nikolay F. Myasoedov, Kuzma S. Rayevsky

Published: Neurochemical Research, Volume 30, No. 12, pp. 1493–1500, December 2005

URL: https://pubmed.ncbi.nlm.nih.gov/16362768/

Scientific Summary

The study investigated Semax’s effects on dopaminergic and serotonergic neurotransmitter systems, two systems central to mood, motivation, cognition, and attention. Researchers used HPLC with electrochemical detection to measure tissue levels and metabolism of dopamine (DA), serotonin (5-HT), and their metabolites (DOPAC, HVA, 5-HIAA) in multiple brain regions of rodents (rats and mice) following intraperitoneal Semax administration. They examined the striatum, nucleus accumbens, hypothalamus, and frontal cortex at various time points. The study found that Semax significantly increased the turnover and metabolism of both dopamine and serotonin in the striatum, nucleus accumbens, and frontal cortex. Specifically, levels of DOPAC and HVA (dopamine metabolites) were elevated, indicating increased dopamine turnover. Serotonin metabolite 5-HIAA was also elevated, indicating enhanced serotonergic activity. The effects were brain region-specific and dose-dependent. These results provided the first direct neurochemical evidence that Semax’s nootropic and cognitive-enhancing properties are mediated at least in part through activation of central dopaminergic and serotonergic transmission.

Plain English Interpretation

This study examined how Semax affects two of the brain’s most important chemical messenger systems: dopamine (the “motivation and reward” chemical) and serotonin (the “mood and well-being” chemical). Scientists gave Semax to rats and mice, then carefully measured the levels of these chemicals and their breakdown products in several key brain regions involved in thinking, motivation, and emotional regulation. The results showed that Semax boosted the activity of both dopamine and serotonin systems in areas critical for cognition—the frontal cortex (planning and decision-making), the striatum (habit formation and motor control), and the nucleus accumbens (motivation and reward processing). The effect was dose-dependent, meaning higher doses produced stronger effects, and it was region-specific, meaning Semax targeted the brain areas most relevant to cognitive function rather than affecting the entire brain indiscriminately. This is important because dopamine and serotonin play central roles in attention, motivation, learning, and mood. Many cognitive-enhancing and antidepressant medications work by modifying these same systems, but often with significant side effects. These findings suggest that Semax enhances cognitive function through a dual mechanism—simultaneously supporting both the dopamine system (boosting focus and motivation) and the serotonin system (supporting mood stability)—which may help explain its broad nootropic profile observed in other research.

Semax and Pro-Gly-Pro Activate the Transcription of Neurotrophins and Their Receptor Genes after Cerebral Ischemia

Authors: Veronika G. Dmitrieva, Oksana V. Povarova, Veronika I. Skvortsova, Svetlana A. Limborska, Nikolay F. Myasoedov, Lyudmila V. Dergunova

Published: Cellular and Molecular Neurobiology, Volume 30, No. 1, pp. 71–79, January 2010

URL: https://pubmed.ncbi.nlm.nih.gov/19633950/

Scientific Summary

The study examined how Semax and its C-terminal tripeptide fragment Pro-Gly-Pro (PGP) affect the transcription of neurotrophin genes and their receptors in the context of focal brain ischemia—a model for stroke. Researchers used a permanent middle cerebral artery occlusion (pMCAO) model in rats. mRNA expression levels of Bdnf, Nt-3, Ngf, TrkB, TrkC, and TrkA were quantified by RT-PCR in the frontoparietal cortex at 3, 24, and 72 hours post-occlusion in four groups: intact rats, sham-operated rats, and ischemic rats treated with either saline or Semax/PGP. The study found that Semax treatment significantly upregulated the transcription of neurotrophins and their receptors specifically in the ischemic cortex: Bdnf, TrkA, and TrkC mRNA levels were elevated at 3 hours, while Nt-3 and Ngf mRNA were elevated at 24 hours. In contrast, PGP had a more nonspecific effect that was also observed in sham-operated and non-occluded rats. The only shared effect of both Semax and PGP was upregulation of Bdnf mRNA in sham-operated rats at 24 hours. This was the first demonstration that Semax specifically activates a coordinated neurotrophin gene expression program in ischemia-damaged brain tissue, providing a transcription-level mechanism for its proven neuroprotective efficacy.

Plain English Interpretation

This research investigated how Semax protects the brain during a stroke—one of its most clinically significant applications. When a stroke occurs, blood flow to part of the brain is cut off, and brain cells begin to die rapidly. The scientists simulated this in rats by blocking a major brain artery, then treated some of the animals with Semax to see what happened at the genetic level. They measured the activity of genes that produce neurotrophins—a family of proteins that act as survival signals for brain cells. These include BDNF (supports learning and memory), NGF (nerve growth factor, critical for neuron survival), and NT-3 (supports nerve cell development). The results were striking: in the stroke-damaged brain tissue, Semax rapidly turned on these protective genes in a coordinated sequence. Within 3 hours, BDNF and certain neurotrophin receptors were activated. By 24 hours, NGF and NT-3 were also upregulated. This matters because it means Semax essentially triggers the brain’s own protective repair program in the exact tissue that needs it most. Unlike PGP (a fragment of Semax that was also tested), which had a more general effect across all brain tissue, Semax’s action was specifically targeted to the damaged area. These findings provide a clear molecular explanation for why Semax has shown neuroprotective benefits in stroke research: it amplifies the brain’s natural defense mechanisms precisely where and when they’re needed most.