Delta sleep-inducing peptide (DSIP) is a nine amino acid peptide that plays various physiological and endocrine roles. It has been associated with altering corticotropin levels, improving sleep patterns, normalizing blood pressure, inhibiting somatostatin secretion, limiting stress, and reducing pain perception. Furthermore, DSIP may have potential applications in the prevention of free radical damage, cancer treatment, and depression.
DSIP was initially isolated from rabbit brains during slow-wave sleep and has been linked to the regulation of sleep-wake cycles in the central nervous system. The synthesis of DSIP and its specific location within the body remain unknown, but studies have found that DSIP levels are equally high in external tissues as they are in the central nervous system. This suggests that DSIP’s primary function may extend beyond sleep and that it may be produced outside the central nervous system. Animal models indicate that DSIP regulates heart rate, blood pressure, thermogenesis, and the lymphokine system, potentially playing a role in preparing the body for sleep by altering its physiology.
While research on the mechanism underlying the connection between DSIP and sleep patterns remains conflicting, it is evident that DSIP is related to the onset of sleep. Human studies have shown that DSIP promotes sleep by inducing feelings of sleepiness, shortening sleep onset, and increasing total sleep time by 59% compared to a placebo. However, electroencephalogram (EEG) recordings do not demonstrate sedation, presenting a paradoxical finding. Notably, a significant research study demonstrated that DSIP improved sleep to match that of control subjects in individuals with chronic insomnia. Studies utilizing polysomnographic equipment have revealed that DSIP enhances sleep efficiency.
DSIP is thought to be a hypothalamic hormone with the potential to regulate more than just sleep, similar to how growth hormone influences various aspects of physiology beyond bone and muscle growth. Studies have shown that DSIP restricts the production of somatostatin, a protein produced in muscle cells that inhibits muscle growth. Similar to the effects of GHRP6, DSIP increases growth hormone activity, promoting muscle growth and enlargement. These findings have led researchers to hypothesize that DSIP may have a broader regulatory role in human physiology, extending beyond sleep promotion.
Research in rats suggests that DSIP may activate opioid receptors, resulting in a dose-dependent reduction in pain sensations. While opioids and DSIP act on the same receptors in the central nervous system (CNS), DSIP does not induce the same level of dependency associated with opioid medications. A preclinical trial in humans demonstrated that DSIP significantly reduced pain perception and improved mood. Additionally, DSIP exhibited the ability to mitigate pain rebound and other withdrawal symptoms that often occur after discontinuing long-term pain therapy, indicating its potential usefulness in patients who are physiologically dependent on other pain medications.
While most cancer research focuses on treatment after diagnosis, there is growing interest in preventive strategies. Cancer vaccines aim to eliminate cancerous cells by stimulating the body’s immune system. In mouse studies, DSIP has shown promise as a potential preventive measure for cancer. Mice injected with DSIP on a consistent monthly basis demonstrated a 2.6 times lower tumor development rate and a 22.6% decrease in chromosomal defects in bone marrow. These findings suggest that DSIP may be more effective in preventing cancer compared to existing vaccines.
CAS Number: 62568-57-4
Formula: C35H48N10O15
Sequence: N-Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu-C
Molar Mass: 848.81 g/mol
Class: Neuropeptide
Storage: Keep refrigerated upon reconstitution.
This preparation is for in vitro laboratory research purposes only by licensed professionals and is not approved by the FDA for bodily introduction of any kind into humans or animals. DSIP / Delta Sleep Inducing Peptide is not a drug, food, supplement, or cosmetic and may not be misbranded, misused, or mislabeled as a drug, food, supplement or cosmetic.
DSIP plays a role in the regulation of circadian rhythm. It also influences the secretion of adrenocorticotropic hormone (ACTH), luteinizing hormone (LH), and Growth Hormone.
Delta sleep has been shown to improve physical health as well as cognitive function. Delta brainwaves are associated with memory, attention span, and reaction time.
At higher doses, DSIP has been reported to cause headaches, nausea, dizziness, or fatigue.
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1. Yehuda S, Carasso RL. DSIP–a tool for investigating the sleep onset mechanism: a review. Int J Neurosci. 1988 Feb;38(3-4):345-53. doi: 10.3109/00207458808990695. PMID: 3286557.
2. Schneider-Helmert D, Gnirss F, Monnier M, Schenker J, Schoenenberger GA. Acute and delayed effects of DSIP (delta sleep-inducing peptide) on human sleep behavior. Int J Clin Pharmacol Ther Toxicol. 1981 Aug;19(8):341-5. PMID: 6895513.
3. Schneider-Helmert D. Effects of delta-sleep-inducing peptide on 24-hour sleep-wake behaviour in severe chronic insomnia. Eur Neurol. 1987;27(2):120-9. doi: 10.1159/000116143. PMID: 3622582.
4. Bes F, Hofman W, Schuur J, Van Boxtel C. Effects of delta sleep-inducing peptide on sleep of chronic insomniac patients. A double-blind study. Neuropsychobiology. 1992;26(4):193-7. doi: 10.1159/000118919. PMID: 1299794.
5. Koval’zon VM. DSIP: peptid sna ili neizvestnyĭ gormon gipotalamusa [DSIP: the sleep peptide or an unknown hypothalamic hormone?]. Zh Evol Biokhim Fiziol. 1994 Mar-Apr;30(2):310-9. Russian. PMID: 7817664.
6. Nakamura A, Nakashima M, Sugao T, Kanemoto H, Fukumura Y, Shiomi H. Potent antinociceptive effect of centrally administered delta-sleep-inducing peptide (DSIP). Eur J Pharmacol. 1988 Oct 18;155(3):247-53. doi: 10.1016/0014-2999(88)90510-9. PMID: 2853064.
7. Larbig W, Gerber WD, Kluck M, Schoenenberger GA. Therapeutic effects of delta-sleep-inducing peptide (DSIP) in patients with chronic, pronounced pain episodes. A clinical pilot study. Eur Neurol. 1984;23(5):372-85. doi: 10.1159/000115716. PMID: 6548970.
8. Popovich IG, Voitenkov BO, Anisimov VN, Ivanov VT, Mikhaleva II, Zabezhinski MA, Alimova IN, Baturin DA, Zavarzina NY, Rosenfeld SV, Semenchenko AV, Yashin AI. Effect of delta-sleep inducing peptide-containing preparation Deltaran on biomarkers of aging, life span and spontaneous tumor incidence in female SHR mice. Mech Ageing Dev. 2003 Jun;124(6):721-31. doi: 10.1016/s0047-6374(03)00082-4. PMID: 12782416.
9. DSIP Peptide: Exploring its Potential in Sleep Regulation and Stress Management. Peptide Information (2023).
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