DSIP: Research on the Delta-Sleep-Inducing Peptide

DSIP, short for delta-sleep-inducing peptide, is a nine-amino-acid neuropeptide with the sequence WAGGDASGE. It was first isolated in connection with delta-wave sleep. In the literature it stands out as much for the open questions as for what is known. This is an educational summary and does not describe any human use.

Where the name comes from

DSIP was identified and named because of its link to delta sleep. Early reviews listed a surprisingly wide range of reported effects across neuroendocrine and stress research models (Graf & Kastin, Neurosci Biobehav Rev, 1984). [1] A peptide that small with that many reported effects drew a lot of early interest.

Still unresolved

Decades later, DSIP is still not well understood. A later review called it a "still unresolved riddle", since no single receptor or clear mechanism has been firmly established (Kovalzon & Strekalova, J Neurochem, 2006). [2] That uncertainty is part of why researchers keep coming back to it.

Beyond sleep

Update reviews reported DSIP-like immunoreactivity in many tissues and its presence in neuroendocrine and stress settings, which suggests its biology goes beyond sleep (Graf & Kastin, Peptides, 1986). [3]

Note: DSIP biology is not fully characterized and the evidence is preclinical. Research-grade material is for laboratory Research Use Only and is not for human or veterinary use.

FAQ

Has a DSIP receptor been confirmed?

No. No single high-affinity receptor or clear mechanism has been firmly established. Reviews treat it as an open question, which is part of why it is still studied.

References

1. Graf & Kastin — DSIP: a review (Neurosci Biobehav Rev, 1984)90022-8)
2. Kovalzon & Strekalova — DSIP: a still unresolved riddle (J Neurochem, 2006)
3. Graf & Kastin — DSIP: an update (Peptides, 1986)90148-8)