DSIP: A Peptide Named After an Effect Nobody Could Pin to It

DSIP Research Standard

DSIP (CAS 62568-57-4) is a nonapeptide isolated from rabbit cerebral venous blood in 1977 and named delta sleep-inducing peptide, supplied as a 5 mg lyophilized powder in a 3 mL vial. Its structure is unlike any other known peptide family, which is part of what has kept it interesting for nearly fifty years. The name, however, has outrun the evidence.^[1]

Mechanism of Action & Research Context

The honest summary of this compound is the title its own review carries: a still unresolved riddle.^[1]

• The sleep hypothesis is weakly supported. The link between DSIP and sleep has never been further characterised since the original isolation. The review states directly that the hypothesis regarding DSIP as a sleep factor is extremely poorly documented and still weak, and that its natural occurrence and biological activity remain obscure.^[1]

• Analogues showed the effect; DSIP itself did not. This is the detail that matters most and the one least often repeated. Significant slow-wave-sleep-promoting activity was found for certain artificial DSIP structural analogues in rabbits and rats — but not for DSIP itself. A naturally occurring dermorphin decapeptide, structurally similar to DSIP at five of nine positions, also promoted slow-wave sleep, while its optical isomer suppressed it.^[1]

• No gene, no protein, no receptor. None has been isolated. That absence is precisely why the mechanism has never been pinned down, and it means receptor-binding approaches have nothing to target.^[1]

• Its immunoreactivity distribution argues against a sleep role. DSIP-like immunoreactivity is highly specifically distributed in neurosecretory hypothalamic nuclei that are not particularly relevant to sleep regulation — which is one reason the review proposes that a distinct DSIP-like peptide may account for the observed activity.^[1]

• Where there is measurable activity. In metaphit-treated rats, DSIP and its tetrapeptide analogue DSIP(1-4) both increased delta-wave power spectra and reduced the incidence, mean grade and tonic component of audiogenic seizures.^[2]

Research Applications

Primary fields of laboratory investigation include:

• EEG power spectrum analysis, where delta-band effects have actually been measured.^[2]

• Comparative analogue studies, since the parent and its structural analogues behave differently — the central unresolved question.^[1]

• Immunoreactivity mapping in hypothalamic nuclei.^[1]

• Seizure models with EEG recording.^[2]

• Identification of the proposed DSIP-like peptide, which remains hypothetical.^[1]

Analytical Documentation

Purity and identity vary by manufacturing lot. Kimera Chems does not publish a single fixed purity figure for this item; refer to the batch-specific Certificate of Analysis (COA) issued for the lot received, which reflects third-party analytical testing for that lot.

References

1. Kovalzon VM, Strekalova TV. Delta sleep-inducing peptide (DSIP): a still unresolved riddle. J Neurochem. 2006;97(2):303–309. doi:10.1111/j.1471-4159.2006.03693.x
2. Stanojlović O, Zivanović D, Mirković S, Mikhaleva I. Delta sleep-inducing peptide and its tetrapeptide analogue alleviate severity of metaphit seizures. Pharmacol Biochem Behav. 2004;77(2):227–234. doi:10.1016/j.pbb.2003.10.014

Storage & Handling

Store at controlled room temperature, sealed and protected from light.

Storage guidance is a house recommendation. Analytical documentation is per-lot release testing.

Related Research Compounds

• Agomelatine
• Seltorexant
• GGN (Melatonin)

Research Use Only Disclaimer: This product is labeled and sold "For Research Use Only - NOT FOR HUMAN CONSUMPTION." It is not a drug, dietary supplement, food, cosmetic, or medical device, and it is not approved by the FDA or any other regulator for human or veterinary use. It is supplied to approved account holders as a research chemical for laboratory use and must be handled in accordance with applicable law.