The immune inheritance
Selank preserves the entire tuftsin sequence and has immune activity of its own.
What Selank kept from its immune ancestor
Selank preserves the entire tuftsin sequence and has immune activity of its own. Studies report that it silences IL-6 gene expression in cultured blood cells from patients with depression, shifts the Th1/Th2 cytokine balance in treated patients, induces interferon gene expression, and shows antiviral activity against influenza in cell culture and in animals. No source this course cites tests whether any of that runs through the same receptor pathway as its phagocytosis-stimulating parent.
This unit covers the immune pillar honestly: it is mechanistically interesting and lineage-consistent, but no immune use is among the indications the Russian registration lists, so it should be taught as a translational hypothesis, not a clinical claim.
Key terms
A retained immune signature
Selank's first four residues, Thr-Lys-Pro-Arg, are the intact tuftsin sequence, and its immune studies introduce it as a synthetic tuftsin analog; that lineage is why immune endpoints were tested at all. A spleen gene-expression study after a single Selank injection found significant changes in 34 of 84 inflammation-related genes across Selank and two of its fragments, sixteen of them under Selank itself: activity the peptide demonstrably has, whatever pathway carries it.
The pattern is selective rather than a blunt immune activation. Selank shifts a specific set of chemokine and cytokine genes, silences IL-6 gene expression in blood cells taken from patients with depression but not from healthy controls, and induces interferon gene expression without affecting TNF-alpha. That selectivity is what makes the immune story interesting. Note the route mismatch worth holding onto: the spleen result came from a single intraperitoneal injection in mice, not from the registered intranasal route.
AdvancedWhy the tuftsin core predicts this
Tuftsin's job is to activate phagocytes and, through its receptor neuropilin-1, to nudge macrophages and microglia toward an anti-inflammatory M2 state. That receptor work was done on tuftsin itself, in mouse microglia, and no cited source tests the same pathway for Selank. So the honest statement is two-part: Selank has documented immune-gene activity, and whether it inherits tuftsin's receptor mechanism along with tuftsin's sequence is an open question rather than an expectation the data support.