DSIP
Delta Sleep-Inducing Peptide
Molecular Details
Overview
DSIP is a nonapeptide (9 amino acids) first isolated in the 1970s from the cerebral venous blood of rabbits during electrically induced sleep. One of the earliest characterized sleep-associated neuropeptides, it has been investigated for roles that extend beyond sleep architecture, including modulation of the stress (hypothalamic-pituitary-adrenal) axis, thermoregulation, and antioxidant defense. Despite decades of study its precise receptor targets and mechanism of action remain incompletely defined, and the majority of the work to date is preclinical.
Published Research
Isolation & Slow-Wave Sleep Association
In vivo (rabbit) · 1977DSIP was first isolated from the cerebral venous blood of rabbits during electrically induced sleep. Researchers characterized a nonapeptide that, on transfer to recipient animals, was associated with the promotion of slow-wave (delta) sleep patterns.
Stress Axis & Neuroendocrine Modulation
In vivo (rodent) · 1984Studies reported that DSIP administration modulated activity of the hypothalamic-pituitary-adrenal axis, with observed effects on ACTH and corticosteroid responses, suggesting a role in neuroendocrine regulation that extends beyond sleep architecture.
Antioxidant & Membrane-Protective Effects
In vivo / In vitro · 2003Preclinical research examined DSIP in models of oxidative stress, reporting reductions in lipid-peroxidation markers and preservation of antioxidant enzyme activity, pointing to membrane-stabilizing and cytoprotective properties.
Thermoregulation & Circadian Interaction
Review / Mechanistic · 2011Reviews synthesizing DSIP research across body-temperature regulation, circadian interaction, and stress adaptation note that its mechanism remains incompletely defined and appears to involve several overlapping systems rather than a single receptor.
Storage & Handling
Store lyophilized powder at –20°C or below for long-term stability. Reconstituted solutions: refrigerate at 2–8°C and use within 2–4 weeks. Protect from light and moisture; avoid repeated freeze-thaw cycles.
For research purposes only. Not intended for human consumption. This profile summarizes published preclinical literature and does not constitute medical, clinical, or dosage guidance.