CNS Research Peptides: Receptor Targets and Assay Models
What the CNS research peptide group holds, where the three compounds came from, and the lab tests used in the field.
Our CNS research peptides group holds three compounds: Semax, Selank and DSIP.
They share a research field. Two of them also share a development history. None of them shares a mechanism.
What is in this group
As with our cytoprotective peptides group, what ties these together is the research context, not the chemistry. They are compounds studied in dish work on brain chemistry and receptor binding.
The three come from completely different starting points.
- Semax, 813.93 g/mol, is built on a piece of ACTH, a pituitary hormone. A Pro-Gly-Pro tail is bolted on the end.
- Selank, 751.88 g/mol, is built on tuftsin. Tuftsin is a natural four-bead peptide with a published role in immune signalling, not brain signalling. It carries the same kind of tail.
- DSIP, 848.82 g/mol, has nine beads. It was first pulled out of blood from the brains of rabbits. Its name is a phrase from the day it was described, kept as a label. It is not a description of what it does.
So: a pituitary hormone, an immune peptide, and something isolated from brain blood. Their weights all sit within a hundred g/mol of each other, which is coincidence and nothing more.
One shared design idea
Semax and Selank do share one real structural feature, and it is deliberate.
Both carry a Pro-Gly-Pro tail bolted onto the parent piece. Proline's ring stiffens the backbone next to it, which makes the nearby joins poor targets for chain-cutting enzymes. So the tail works as a protective cap.
That is a design habit, not a mechanism. Two compounds sharing a protective cap are no more related in what they do than two buildings sharing a foundation type are related in purpose. It just tells you they came out of the same research programme.
DSIP has no such cap.
What researchers have looked at
Each compound's research sits in a different area.
Semax is reported in connection with BDNF, a growth factor for nerve cells, and its receptor. It also appears in animal work on the systems that use dopamine and serotonin. Whether it acts at pigment receptors, given its ACTH parent, is itself an open question in published research.
Selank is reported in connection with GABA signalling, and with the activity of genes tied to that system. Its research body is smaller, and some of it reflects the immune role of its tuftsin parent.
DSIP has the thinnest research of the three. Reported work covers how it binds and some brain-chemistry measurements. It is much less settled than the other two, and its product page says so.
The tests used in this field
Knowing the standard formats makes this research far easier to read.
Binding tests. A labelled reference key competes with the test compound for a receptor. You measure how much test compound it takes to push the reference off. That gives you grip strength, and nothing else. Gripping a lock is not the same as turning it.
Gene and protein tests. Measuring how much of a specific gene or protein is present after exposure. Most of the BDNF work is this kind.
Transmitter tests. Done on tissue or cultured nerve cells, measuring the movement of a signalling chemical rather than anything downstream of it.
Rodent behaviour studies. A large part of the published work on all three is rodent behaviour. This is where the most caution belongs. A behaviour measured in a rodent is a measurement in that rodent model. Second-hand write-ups routinely restate those findings in language the original papers never used.
Two cautions specific to this group
Most of the research is Russian. Semax and Selank were developed and studied mainly inside the Russian research system, and a lot of the original work sits outside English-language indexes. Tracing a claim to its source is harder here than anywhere else in our range, and English summaries vary a great deal in how faithful they are.
Second-hand sources are unusually bad in this field. Compounds studied for brain effects attract outcome-flavoured descriptions the original papers do not contain. The only reliable approach is to read the primary source, and to note which kind of study it was: a binding test, a gene test, or rodent behaviour.
Handling and paperwork
All three come as 10mg freeze-dried vials. Store at minus 20 degrees Celsius, away from light. What each dissolves in is on its own product page, and those figures do not swap between compounds.
Batch analysis for Semax, Selank and DSIP is published. Each confirms identity by weighing the molecule against the expected value, and reports purity by chromatography. Our guide to reading a chromatogram covers what those plots show.
Semax and Selank come together as a bundle of two separate freeze-dried vials. That reflects how often they turn up in the same research programme.
Everything in our catalogue is for lab research only. It is not a medicine, and it is not for people or animals to take.
