Semax is a synthetic heptapeptide from the ACTH 4-7 sequence, developed in Russia during the 1980s for neuroprotective and cognitive effects. Research shows it upregulates BDNF and TrkB, improves outcomes in ischemia models, and enhances learning in rodents. This guide covers its structure,…
Semax stands out as a synthetic heptapeptide based on the adrenocorticotropic hormone ACTH sequence. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences created it during the Soviet era, with work starting in the 1980s. It came from a program that yielded several peptides with noted neurological impacts in preclinical studies.
Full ACTH, a 39-amino acid peptide, shows effects on learning, memory, and attention separate from adrenal functions. These tie to the ACTH 4-7 fragment: Met-Glu-His-Phe, the shortest part needed for such activity without steroid effects.
Semax adds a Pro-Gly-Pro extension to the ACTH 4-7 core. This change boosts metabolic stability, a common issue for short neuropeptides. Proline at key spots blocks enzyme breakdown, and the C-terminal prolyl amide resists carboxypeptidases.
Without this, ACTH 4-7 breaks down quickly via endopeptidases. Semax matches the core's neurological profile but lasts longer in fluids. Russia registered it as nasal drops, a rare approval for a synthetic peptide from that research system.
The Met-Glu-His-Phe part binds melanocortin receptors, especially MC4R in the central nervous system. It adjusts dopaminergic and serotonergic transmission through unclear steps.
Studies link ACTH 4-7 analogs to higher brain-derived neurotrophic factor BDNF in neural tissue. This offers a basis for cognitive and protective effects. Semax reliably raises BDNF and TrkB receptor levels.
BDNF supports neuron survival, maintenance, and growth. It plays a role in synaptic plasticity for learning and memory. Rodent studies show more BDNF mRNA in hippocampus, cortex, and frontal lobe after dosing, with dose-related and lasting effects.
Semax features in rodent tests of cerebral ischemia, using permanent or transient middle cerebral artery occlusion MCAO . Such work positions it for probing ischemia protection mechanisms.
In vitro setups like oxygen-glucose deprivation OGD in neuron cultures use Semax to check activated pathways. Use our Reconstitution Calculator /tools/peptide-reconstitution-calculator for preparing solutions in these experiments.
Rodent tests with Morris water maze, novel object recognition, and contextual fear conditioning reveal Semax benefits. It aids spatial learning, memory consolidation, and attention across strains and setups.
These hold in healthy animals, not just impaired ones like age decline, post-ischemia, or cholinergic lesions. This draws interest for baseline cognitive studies. Explore our Peptide Glossary /tools/peptide-glossary for terms like synaptic plasticity.
Semax alters monoamine levels in rodents. Neurochemical analyses note shifts in these dynamics post-administration.
Dopaminergic effects suit study in PC12 cells or ventral mesencephalic cultures. This helps identify molecular targets. Check interactions with our Peptide Interaction Checker /tools/peptide-interaction-checker .
N-Acetyl Semax adds an N-terminal acetyl group for extra stability against aminopeptidases. It lasts longer and may vary in potency, but keeps core actions.
Selank TKPRPGP , from tuftsin, targets anxiety via GABA and enkephalins. Pairing it with Semax separates cognitive from calming effects.
Peptides like Semax contrast small-molecule nootropics such as amphetamines, racetams, or modafinil. Their size leads to unique pharmacokinetics, often nasal or injected routes, and distinct pharmacology for sustained enhancement research.
Preclinical work tests Semax via various routes. In vitro, add it to culture media at set levels.
Semax 10mg comes as lyophilized powder for reconstitution. Store dry form at −20°C up to 24 months; keep solutions at 2, 8°C for 28 days. Shield from light to avoid methionine oxidation at position 1. Plan dosages with our Dosage & Cycle Planner /tools/peptide-dosage-planner and check half-life via Half-Life Calculator /tools/peptide-half-life-plotter .
Semax provides a stable tool for BDNF studies, neuroprotection, and cognition. Its profile supports precise preclinical investigations into brain function.
Peptides referenced: Selank, Semax.
Related reading: Precision Peptide Syringes for Accurate Research Dosing, BPC-157 Shelf Life: Lyophilized vs Reconstituted Stability Guide, BPC-157 + TB-500 Peptide Blend: Research on Healing and Repair, Oxytocin's Vital Role in Social and Relationship Bonds.