Other · Pronociceptin-derived neuropeptide
Nocistatin
Also known as NST
A species-variable pronociceptin-derived peptide studied in neuronal signalling, with no established cognate receptor.
- Length
- Species-dependent; 17 amino acids in the original bovine peptide, 30 in the human form
- Half-life
- Not well characterised
- Mechanism
- Nocistatin modulates neuronal signalling through mechanisms that remain incompletely resolved, without an established cognate receptor. It does not act as a conventional competitive antagonist at the nociceptin opioid peptide receptor (NOP; OPRL1), despite opposing some nociceptin-associated responses in experimental models.
- Studied in
- Rodent spinal cord slices, neuronal preparations and animal sensory-processing models investigate nocistatin-dependent modulation of inhibitory transmission and nociceptin-associated signalling.
About Nocistatin
Nocistatin was identified in 1998 as a biologically active peptide derived from the same precursor as nociceptin/orphanin FQ. That precursor, encoded by PNOC, contains distinct peptide regions that can yield different signalling products. The originally isolated bovine nocistatin contains 17 amino acids, whereas the human form contains 30. Consequently, the name alone does not define a unique sequence, and species identity is essential when comparing research materials or publications.
Although early experiments described opposition to certain nociceptin-associated responses, nocistatin is not simply an antagonist at the NOP receptor. A definitive cognate receptor has not been established, and its signalling remains less resolved than that of nociceptin. Electrophysiological studies in rodent spinal preparations have examined modulation of glycinergic and GABAergic transmission. Interpretation depends on the peptide species, preparation and endpoint, rather than assuming one universal relationship between the two precursor-derived peptides.
Laboratory notes
- Specify the organism, complete sequence and terminal chemistry; 'nocistatin' alone is not an adequate material identifier.
- Include nociceptin and suitable pathway controls without assuming that NOP receptor blockade will eliminate nocistatin responses.
- Assess peptide integrity over the assay incubation, particularly in tissue preparations containing active extracellular peptidases.
Storage and reconstitution basics: storage guide.
Questions about Nocistatin
Why do nocistatin products have different lengths?
Nocistatin sequences vary between species. The original bovine peptide has 17 residues, while the human form has 30; the supplied sequence must therefore be specified.
Does nocistatin bind the same receptor as nociceptin?
It is not established as a ligand acting through the canonical nociceptin receptor, NOP. Its cognate receptor remains unresolved.
Are nocistatin and nociceptin interchangeable assay reagents?
No. They occupy different regions of the PNOC precursor and have distinct sequences and experimental pharmacology.
Is Nocistatin for human use?
No. It is supplied strictly for in-vitro laboratory research and is not for human or animal consumption.
Related research peptides
All products are sold for laboratory research use only. Not for human consumption, not a medicine, not for diagnosing, treating or preventing any condition.