Synthesis of delta sleep-inducing peptide (DSIP) and its physiological activity.
Ji. A X AX; Li. C X CX; Ye. Y H YH; Lin. Y Y; Xing. Q Y QY; Liu. S Y SY; Zhang. W Y WY; Wang. Z S ZS; Dai. X J XJ
Key Findings
- Synthetic DSIP can be produced in a pure, stable form.
- Intravenous DSIP increases delta and sigma EEG activity in rabbits, indicating deeper sleep-like brain states.
- No tolerance develops after six days of daily IV dosing (50 µg/kg).
- Higher doses delivered directly to the brain do not further enhance the EEG effect.
Practical Outcomes
- For biohackers, DSIP appears to promote deep‑sleep brain wave activity without rapid tolerance, which is promising for sleep optimization. However, the data are from rabbits, not humans, and the effective dose and safety profile in people remain unknown, so any self‑experiment should start with very low doses and careful monitoring.
Summary
Researchers made a pure form of the sleep‑inducing peptide DSIP and gave it to rabbits. When injected, DSIP boosted the deep‑sleep brain waves (delta and sigma) on EEG, and the effect didn’t wear off after a week of daily dosing. Even much larger doses directly into the brain didn’t make the effect stronger, suggesting DSIP works differently from ordinary sleeping pills.
Abstract
Protected nonapeptide--Delta Sleep-Inducing Peptide (DSIP) formula: see text has been synthesized by classical method. The product has been treated with TFA and purified on DEAE-Sephadex-A25 column, pure free nonapeptide obtained and alpha to beta transposition of Asp-residue found to be absent. It has been assayed by electrophoresis at pH 3.8, microcrystallinecellulose TLC and HPLC. The physiological activities of synthetic DSIP are performed on rabbits by using intravenous administration or mesodiencephalic ventricular infusion. Its function of intensifying delta and sigma waves on rabbit's electroencephalogram (EEG) is evident. There is no concomitant increase of delta- and sigma-enhancing effect following mesodiencephalic ventricular infusion of 10 or 20 times higher than 5 microgram/rabbit doses. Results of 6-day consecutive intravenous administration (50 microgram/kg) indicate that there is no obvious sign of adaptation to DSIP. Results suggest that the physiological function of endogenous sleep-inducing peptide is different from that of general sleeping draught.
Study Information
pubmed
1983