Neural & Cognitive System

System Overview Neural Biology. Investigated at the Peptide Level.

• Mechanisms & Compounds

  The compounds in this system represent two distinct research lineages from Russian neuropharmacology, both originating from the Institute of Molecular Genetics and related institutions, and both with regulatory approval in Russia while remaining unapproved in Western markets. Semax, a synthetic heptapeptide analog of the ACTH(4-10) fragment with a stabilizing Pro-Gly-Pro C-terminal extension, is among the most mechanistically characterized nootropic peptides in the published literature. Studies document its rapid upregulation of BDNF and its receptor TrkB in the hippocampus (Dolotov et al., Brain Research, 2006; PMID: 16996037), modulation of dopaminergic and serotonergic neurotransmission, and broad transcriptional effects across genes involved in neuronal survival and synaptic plasticity. In preclinical ischemia models, Semax is investigated for neuroprotective activity including attenuation of infarct volume and post-ischemic inflammatory cascades.

  Selank, a synthetic heptapeptide derived from the immunomodulatory peptide tuftsin (with the same C-terminal Pro-Gly-Pro stabilization), occupies a distinct mechanistic niche centered on the GABAergic axis: research documents its activity as a positive allosteric modulator of GABAA receptor subunits (particularly α2/α3/γ2), modulation of serotonin turnover in the prefrontal cortex and hippocampus, and inhibition of enkephalin degradation — a multi-pathway anxiolytic profile documented in a published clinical comparison against the benzodiazepine medazepam (Zozulia et al., PMID: 18454096). Pinealon (Glu-Asp-Arg; EDR tripeptide) belongs to Khavinson’s bioregulator peptide class — short sequences hypothesized to interact with DNA at promoter regions to modulate gene expression in target tissues. Research investigates its influence on circadian clock gene expression, pineal gland function, antioxidant enzyme upregulation (SOD2, GPx1), and neuroprotective signaling in oxidative and excitotoxic stress models. The hypothesis of direct peptide-DNA interaction remains under investigation and has not reached scientific consensus. DSIP (Delta Sleep-Inducing Peptide), a naturally occurring nonapeptide originally isolated from rabbit cerebral venous blood, is studied for its influence on slow-wave sleep architecture, N-acetyltransferase activity in the pineal gland, and circadian entrainment — representing a distinct entry point into sleep biology from the angle of endogenous sleep regulation. The literature on DSIP is more sparse than that of Semax and Selank, with the foundational isolation work dating to Monnier et al. (1977) and more recent data remaining limited.

  Connections to the Axion Portfolio

  The Neural & Cognitive System sits at the intersection of several research domains active across the broader Axion portfolio. The neuroprotective pathways investigated with Semax — particularly BDNF/TrkB signaling and ischemia-related inflammatory modulation — overlap mechanistically with the NF-κB research conducted in the Regenerative System (KPV, GHK-Cu). The pineal-circadian-mitochondrial axis links directly to the Mitochondrial Energy System: neural tissue carries among the highest mitochondrial density in the body, and circadian disruption is a documented driver of mitochondrial dysfunction. Selank’s tuftsin-derived immunomodulatory properties extend into neuroimmune research that spans this system and the Regenerative System. The GH Axis is also relevant: IGF-1 signaling, a central subject of that system, has documented roles in hippocampal neurogenesis and cognitive function. And the neuroendocrine control of appetite and behavior studied with incretin compounds in the Metabolic Regulation System originates, mechanistically, in hypothalamic neuropeptide circuits — a domain central to this system’s research scope.

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