DSIP Peptide (Delta Sleep-Inducing Peptide) – Research Grade

Product Overview

DSIP (Delta Sleep-Inducing Peptide) is a naturally occurring nonapeptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) first isolated in 1977 from the cerebral venous blood of rabbits during induced sleep . This neuropeptide is synthesized in the hypothalamus and is found in neurons, peripheral organs, and plasma . Its name originates from its first discovered physiological action: an EEG delta/spindles-inducing effect .

DSIP is unusual among peptides for its ability to freely cross the blood-brain barrier and its apparent absorption from the gastrointestinal tract without being fully denatured by enzymes . Research has since revealed a broader spectrum of activity beyond sleep regulation, including effects on stress response, neuroprotection, and endocrine modulation .

⚠️ Research Context: This product is intended exclusively for in-vitro and laboratory research purposes. It is not approved by the FDA for human use. The existence of a specific DSIP receptor and its definitive physiological role remain subjects of ongoing investigation .

Mechanism of Action

DSIP exerts its effects through multiple pathways, though a definitive high-affinity receptor has not yet been identified :

GABAergic System Modulation:

• DSIP potentiates GABA-activated currents in hippocampal and cerebellar neurons, providing a plausible mechanism for its sedative and anticonvulsant effects 

Glutamatergic System Modulation:

• Blocks NMDA-activated potentiation in cortical and hippocampal neurons, potentially contributing to neuroprotective properties by mitigating excitotoxicity 

Endocrine System Modulation:

• Influences the hypothalamic-pituitary-adrenal (HPA) axis, decreasing basal corticotropin (ACTH) levels and reducing cortisol 

• May stimulate release of luteinizing hormone (LH) and growth hormone (GH) 

Opioid System Interaction:

• Has been found to act as an antagonist at opiate receptors, which may explain its observed effects in withdrawal management 

Antioxidant Effects:

• Demonstrates antioxidant properties, enhancing oxidative phosphorylation in mitochondria and reducing oxidative stress markers 

Key Research Applications:

• Sleep regulation and insomnia research

• Stress response and HPA axis studies

• Neuroprotection and excitotoxicity research

• Withdrawal syndrome research (opioid/alcohol)

• Circadian rhythm investigations 

Product Specifications

Quality Assurance

Every batch of DSIP undergoes rigorous analytical testing:

Certificate of Analysis (COA) available upon request.

Research Background

Discovery and Early Research

DSIP was first isolated in 1977 from the extracorporeal dialysate of venous blood from the sinus confluens of rabbits during electrical stimulation of the interlaminar thalamus . Its sleep-promoting effects were demonstrated in rabbits, mice, rats, cats, and human beings . DSIP promotes a particular type of sleep characterized by an increase in the delta rhythm of the EEG .

Pharmacokinetic Properties

• Plasma half-life: 7-8 minutes 

• Blood-brain barrier: Freely crosses the BBB 

• Bioavailability (SC): ~80% 

• Protein binding: ~99% 

• In vitro half-life: ~15 minutes 

Transport and Metabolism Research

DSIP is rapidly metabolized in intestinal epithelial cell models. Research using Caco-2 cell monolayers identified that the peptide is rapidly metabolized when applied to the apical side (8.2% remaining after 2 hours), with Trp as the major metabolite. Aminopeptidase inhibitors increased stability substantially (95.1% remaining after 2 hours with combined inhibitors), though no intact DSIP was detected on the basolateral side .

Sleep Research Findings

Studies on DSIP’s sleep-promoting effects have produced mixed results:

• Original rabbit studies demonstrated increased delta wave sleep 

• Some preclinical studies reproduced these effects, but not all 

• Studies on efficiency of DSIP in insomnia treatment have produced conflicting results 

• DSIP has been described as a “sleep-promoting substance” rather than a sedative, with greater activity when sleep is disturbed and minimal effects in healthy subjects 

• Dosing timing is critical: a dose given during the day may promote improved sleep on the following night and for several nights thereafter 

Non-Sleep Research

Neuroprotection:

• Anticonvulsant action in rats (increases threshold to NMDA- and picrotoxin-induced convulsions) 

• Reduced mortality and post-ischemia dysfunction in bilateral carotid ligation models 

• Reduced brain swelling in toxic cerebral edema models 

Stress and Endocrine:

• Attenuates emotional and psychological responses to stress in rats 

• Reduces central amine responses to stress 

• May decrease ACTH secretion and modulate the HPA axis 

• Paradoxically, plasma DSIP concentrations exhibit diurnal variation, with low concentrations in the morning and higher in the afternoon 

Withdrawal Research:

• Has been studied for treatment of alcohol and opioid withdrawal with some reported success 

Clinical Study Challenges

The existence of a specific DSIP receptor has not been definitively confirmed . Some research suggests DSIP may be of bacterial origin . A BLAST search of the peptide sequence showed alignment with hypothetical proteins in Amycolatopsis coloradensis and other bacterial species, raising this possibility . Administration of synthetic DSIP does not appear to induce tolerance .

Storage & Reconstitution Guidelines

Storage Conditions:

• Lyophilized (Long-term): -20°C, protected from light, dry, sealed 

• Lyophilized (Short-term): 2°C – 8°C (refrigerated) 

• Reconstituted: 4°C for up to 7 days; aliquot and store at -20°C for longer storage; avoid repeated freeze-thaw cycles 

• Long-term storage: Add a carrier protein (0.1% HSA or BSA) 

Reconstitution Protocol:

1. Allow vial to reach room temperature

2. Add sterile 18 MΩ-cm H₂O or bacteriostatic water (minimum 100 µg/mL) 

3. Gently swirl (do not vortex) until fully dissolved

4. Dispense into individual aliquots to minimize freeze-thaw degradation

Important Notice

⚠️ FOR RESEARCH USE ONLY

This product is not intended for human consumption, diagnostic use, therapeutic application, or clinical administration. DSIP is a research chemical intended exclusively for in-vitro and laboratory research purposes.

• Not approved by the FDA for human use

• Not a dietary supplement, food additive, or pharmaceutical for over-the-counter purchase

• No definitive receptor identified and mechanism of action remains incompletely characterized 

• Clinical evidence is mixed, particularly for sleep applications 

• Intended solely for qualified researchers and scientific institutions

By purchasing this product, you confirm that you are a licensed researcher or laboratory professional and agree to use this compound in compliance with all applicable local, national, and international regulations.

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DSIP Peptide 5mg – ≥98% Purity
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