Neuropeptides in Cognitive Research: Semax and Selank

Cognitive and neuro research has long been interested in short peptides that influence signaling in the nervous system. Two synthetic neuropeptides appear frequently in this literature: Semax and Selank. Both are analogs — synthetic molecules modeled on naturally occurring sequences — and both are studied for their effects on neurochemical signaling.

Semax is a heptapeptide analog derived from a fragment of adrenocorticotropic hormone, or ACTH. In the research literature it is examined for its relationship to brain-derived neurotrophic factor, a protein involved in the growth and maintenance of neurons. The neurotrophic-signaling angle is what places Semax in cognitive-research discussions.

Selank is a synthetic analog of tuftsin, an endogenous immunomodulatory peptide. It is studied for its influence on GABA and serotonin pathway signaling, as well as for immunomodulatory properties. Its anxiolytic-pathway research context is distinct from Semax's neurotrophic focus, which is why the two are often discussed together as complementary research subjects.

As with every compound in this journal, the descriptions here summarize what is studied in laboratory research, not established applied effects. These materials are supplied for in-vitro research use by qualified professionals only.