Delta Sleep-Inducing Peptide (DSIP) is a naturally occurring nonapeptide originally identified in mammalian central nervous system tissue. In laboratory research, DSIP is studied as an endogenous signaling molecule involved in neuroendocrine regulation, mitochondrial metabolism, stress-response signaling, and circadian-associated biochemical pathways. Experimental investigations have focused on its molecular interactions in neuronal, glial, and peripheral tissues using cellular systems and in vivo animal models.

Sequence: Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu
Molecular Formula: C₃₅H₄₈N₁₀O₁₅
Molecular Weight: 848.824 g/mol
PubChem CID: 68816
CAS Number: 62568-57-4
Synonyms: Emideltide, DSIP nonapeptide, Deltaran

Source: PubChem

DSIP is utilized in laboratory research to investigate neurochemical signaling networks and metabolic stress-response mechanisms. Common experimental contexts include:

• Neuroendocrine signaling modulation in neuronal and glial cell cultures
• Mitochondrial respiration and oxidative phosphorylation assays under hypoxic or stress-induced conditions
• Monoaminergic enzyme regulation (e.g., MAO-A activity) in neural tissue models
• Circadian-associated biochemical oscillations in rodent systems
• Stress-response pathway analysis involving hypothalamic-pituitary-adrenal (HPA) axis signaling components
• Neurotransmitter synthesis and turnover in controlled in vitro and in vivo models

Experimental evidence suggests DSIP participates in intracellular signaling pathways associated with mitochondrial energy metabolism, monoamine regulation, and stress-adaptive biochemical responses. In preclinical systems, DSIP has been examined for its influence on monoamine oxidase activity, serotonergic signaling balance, and mitochondrial respiration efficiency under hypoxic or stress-mimetic conditions.

Additional mechanistic investigations have evaluated DSIP-associated modulation of neurovascular tone, thermoregulatory signaling, and neuroendocrine feedback loops. These studies emphasize pathway-level biochemical changes rather than organism-level functional outcomes.

Preclinical literature documents DSIP-related activity across a range of experimental models, including rodent brain tissue, mitochondrial preparations, and stress-exposure paradigms. Reported findings include alterations in oxidative phosphorylation efficiency, monoamine enzyme activity, and biochemical markers associated with stress adaptation and circadian regulation.

Animal studies have further explored DSIP distribution in central and peripheral tissues, indicating its presence beyond canonical CNS-localized signaling frameworks. These findings support continued investigation of DSIP as a regulatory peptide with system-wide biochemical relevance in experimental biology.

DSIP is supplied as a synthetic research peptide for laboratory use. Identity and integrity are commonly confirmed through analytical techniques such as high-performance liquid chromatography (HPLC) and mass spectrometry (MS). Sequence verification and molecular weight confirmation support reproducibility in experimental workflows.

The above literature was researched, edited and organized by Dr. Logan, M.D. Dr. Logan holds a doctorate degree from Case Western Reserve University School of Medicine and a B.S. in molecular biology.

Shlomo Yehuda, Ph.D. has released hundreds of publications relating to the depths of neuroscience, thermoregulation, pharmacology, and the intricacies of colliding mechanisms of action. He specifically studied the effects of mice that consumed DSIP/DSIP-P while being continuously exposed to light, DSIP as a tool for investing the sleep onset mechanism, the peculiar thermoregulatory effects of DSIP at low and high doses, and the effects of DSIP on pain thresholds during light and dark periods in rats.

Shlomo Yehuda, Ph.D. is being referenced as one of the leading scientists involved in the research and development of DSIP. In no way is this doctor/scientist endorsing or advocating the purchase, sale, or use of this product for any reason. There is no affiliation or relationship, implied or otherwise, between Peptide Sciences and this doctor. The purpose of citing the doctor is to acknowledge, recognize, and credit the exhaustive research and development efforts conducted by the scientists studying this peptide. Shlomo Yehuda, Ph.D. is listed in [19] [20] [21] and [22] under the referenced citations.

1. “The influence of synthetic DSIP (delta-sleep-inducing-peptide) on disturbed human sleep | SpringerLink.” [Online]. Available: https://link.springer.com/article/10.1007/BF01971753. [Accessed: 25-Jun-2019].
2. “Effects of delta-sleep-inducing peptide on 24-hour sleep-wake behaviour in severe chronic insomnia. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/3622582. [Accessed: 25-Jun-2019].
3. “Effects of delta sleep-inducing peptide on sleep of chronic insomniac patients. A double-blind study. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/1299794. [Accessed: 25-Jun-2019].
4. “Acute and delayed effects of DSIP (delta sleep-inducing peptide) on human sleep behavior. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/6895513. [Accessed: 25-Jun-2019].
5. “Therapeutic effects of delta-sleep-inducing peptide (DSIP) in patients with chronic, pronounced pain episodes. A clinical pilot study. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/6548970. [Accessed: 25-Jun-2019].
6. “Potent antinociceptive effect of centrally administered delta-sleep-inducing peptide (DSIP). – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/2853064. [Accessed: 25-Jun-2019].
7. “Delta sleep inducing peptide (DSIP): effect on respiration activity in rat brain mitochondria and stress protective potency under experimental hypo… – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/12668217. [Accessed: 25-Jun-2019].
8. “Effects of delta-sleep inducing peptide (DSIP) and some analogues on the activity of monoamine oxidase type A in rat brain under hypoxia stress. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/7628639. [Accessed: 25-Jun-2019].
9. “Decreased concentrations of delta-sleep inducing peptide in plasma and cerebrospinal fluid from depressed patients: Nordisk Psykiatrisk Tidsskrift: Vol 39, No sup11.” [Online]. Available: https://www.tandfonline.com/doi/abs/10.3109/08039488509101959. [Accessed: 25-Jun-2019].
10. “Delta sleep-inducing peptide (DSIP): An overview of central actions and possible relationship to psychiatric illnesses: Nordisk Psykiatrisk Tidsskrift: Vol 42, No 2.” [Online]. Available: https://www.tandfonline.com/doi/abs/10.3109/08039488809103215. [Accessed: 25-Jun-2019].
11. “High delta sleep-inducing peptide-like immunoreactivity in plasma in suicidal patients with major depressive disorder. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/9606527. [Accessed: 25-Jun-2019].
12. “Opioid detoxification with delta sleep-inducing peptide: results of an open clinical trial. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/9617990. [Accessed: 25-Jun-2019].
13. “DSIP in the treatment of withdrawal syndromes from alcohol and opiates. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/6548969. [Accessed: 25-Jun-2019].
14. “Effect of delta-sleep inducing peptide-containing preparation Deltaran on biomarkers of aging, life span and spontaneous tumor incidence in female … – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/12782416. [Accessed: 25-Jun-2019].
15. A. B. Sinyukhin, G. P. Timoshinov, V. A. Kornilov, and P. D. Shabanov, “P.7.a.006 Delta sleep-inducing peptide analogue corrects the CNS functional state of children treated with antiblastomic therapy,” Eur. Neuropsychopharmacol., vol. 19, pp. S681–S682, Sep. 2009.
16. E. V. Koplik et al., “Delta sleep-inducing peptide and Deltaran: potential approaches to antistress protection,” Neurosci. Behav. Physiol., vol. 38, no. 9, pp. 953–957, Nov. 2008.
17. “[DSIP: the sleep peptide or an unknown hypothalamic hormone?]. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/7817664. [Accessed: 25-Jun-2019].
18. “DSIP–a tool for investigating the sleep onset mechanism: a review. – PubMed – NCBI.” [Online]. Available: https://www.ncbi.nlm.nih.gov/pubmed/3286557. [Accessed: 25-Jun-2019].
19. Shlomo Yehuda & Ralph L. Carasso (1987) The Effects of Dsip on Pain Threshold During Light and Dark Periods in Rats are not Naloxone-Sensitive, International Journal of Neuroscience, 37:1-2, 85-88, DOI: 10.3109/00207458708991805
20. Graf, Markus & Christen, Heinz & Schoenenberger, Guido. (1982). DSIP/DSIP-P and circadian motor activity of rats under continuous light. Peptides. 3. 623-6. 10.1016/0196-9781(82)90161-9.
21. Shlomo Yehuda & Ralph L. Carasso (1988) Dsip-a Tool for Investigating the Sleep Onset Mechanism: A Review, International Journal of Neuroscience, 38:3-4, 345-353, DOI: 10.3109/00207458808990695
22. Yehuda, S., Kastin, A.J. and Coy, D.H. (1980). Thermoregulatory and locomotor effects of DSIP: Paradoxical interaction with d-amphetamine. Pharmacology Biochemistry and Behavior, [online] 13(6), pp.895–900. Available at: https://www.sciencedirect.com/science/article/pii/0091305780902257

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