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Emideltide, DSIP nonapeptide, Delta sleep-inducing peptide
A neuropeptide that induces delta sleep, reduces stress, modulates hormone release, and exhibits antioxidant effects in various physiological processes.
Schneider-Helmert. D D
Research shows that giving delta sleep‑inducing peptide (DSIP) as a single shot of about 25 nmol per kilogram right before bedtime can improve sleep, and taking it for a few nights in a row may make the effect stronger. Morning doses also help night sleep while boosting daytime energy, but taking it twice a day doesn’t add extra benefit. One severe insomnia case improved with higher doses.
Kastin. A J AJ; Banks. W A WA; Castellanos. P F PF; Nissen. C C; Coy. D H DH
The study shows that some modified versions of the sleep‑inducing peptide DSIP get into the rat brain better than others when injected into the bloodstream. In particular, versions with a D‑alanine at position 4 (and a version missing the first tryptophan) cross the blood‑brain barrier more efficiently, and this effect is stronger in larger/older rats. The findings suggest that the brain entry of DSIP isn’t just random leakage but may be selective.
Schoenenberger. G A GA
Delta-sleep‑inducing peptide (DSIP) is a naturally occurring nine‑amino‑acid peptide that can promote sleep, affect circadian rhythms, and modulate stress‑related hormones in animals. Small changes to its sequence wipe out the effect, and a phosphorylated version (DSIP‑P) is even more potent. The peptide crosses the blood‑brain barrier, is found in human fluids, and its levels drop with alcohol dependence.
Banks. W A WA; Kastin. A J AJ
The study shows that the amount of DSIP (a sleep‑related peptide) in the blood matches the amount in the brain fluid, meaning blood levels can hint at what's happening in the brain. This suggests that taking DSIP by injection or other peripheral routes could actually reach the brain, though the exact way it gets across the blood‑brain barrier isn’t clear.
Schneider-Helmert. D D; Schoenenberger. G A GA
DSIP (delta‑sleep‑inducing peptide) given by slow IV injection can make people fall asleep about an hour after dosing and keep them asleep for up to 20 hours. In a small set of studies it also boosted alertness and performance when awake and seemed to help people handle stress better. Four consecutive doses completely fixed insomnia in the tested participants.
Kato. N N; Honda. Y Y; Ebihara. S S; Naruse. H H; Takahashi. Y Y
Researchers created a test to measure the sleep‑inducing peptide DSIP and used it to see how fast the peptide disappears from the blood of dogs, monkeys and rats. They found DSIP is cleared very quickly – only a few minutes before half of it is gone.
Kaeser. H E HE
In a tiny open‑label trial, seven people with very bad insomnia got ten shots of the peptide DSIP. Six of them slept normally again and kept that improvement for a few months, and they also felt better and performed better during the day. The authors note that a history of drug addiction might complicate things.
Banks. W A WA; Kastin. A J AJ; Coy. D H DH
Scientists showed that the sleep‑inducing peptide DSIP can move from the bloodstream into the brain in rats and into the cerebrospinal fluid in dogs, and this movement isn’t blocked by adding extra DSIP or similar molecules.
Fischman. A J AJ; Kastin. A J AJ; Graf. M V MV
The study shows that when measuring the peptide DSIP with a combo of HPLC and radioimmunoassay, leftover peptide from previous runs can falsely appear as if the test sample contains DSIP, creating up to a 10% error. Using a labeled version of the peptide reduces this error to about 1%. So, the measurement method can give misleading results if you’re not careful.
Miller. L H LH; Turnbull. B A BA; Kastin. A J AJ; Coy. D H DH
In rats, a peptide called DSIP and a more brain‑penetrant version of it boost deep‑sleep brain waves (delta) when injected under the skin, and the analog also adds theta waves and makes the animals less active. This shows that DSIP can reach the brain from the bloodstream and influence sleep patterns.
Banks. W A WA; Kastin. A J AJ
The paper reviews evidence that many peptide hormones can get into the brain from the bloodstream. How well they cross depends on their size, charge, fat‑solubility and how tightly they bind proteins. Most get through by a passive, non‑saturable route, while a few use specific transporters. Big pores or cell‑eating processes aren’t important, and aluminum can temporarily make the barrier more leaky to fat‑soluble peptides.
Graf. M M; Baumann. J B JB; Girard. J J; Tobler. H J HJ; Schoenenberger. G A GA
In rats, a single IV dose of delta sleep‑inducing peptide (DSIP) changed brain chemicals like serotonin, dopamine and norepinephrine, as well as blood proteins and stress hormone levels, and these changes varied depending on whether the peptide was given in the morning or evening.
Kastin. A J AJ; Nissen. C C; Coy. D H DH
The study shows that the sleep‑inducing peptide DSIP can move from the bloodstream into the brain in rats, especially a synthetic version called [D‑Ala3]‑DSIP, which gets into the brain even better. This means that taking DSIP by injection or possibly other peripheral routes could still affect brain function, not just stay in the blood.
Schneider-Helmert. D D; Schoenenberger. G A GA
A small study gave six middle‑aged people with chronic insomnia an IV dose of synthetic DSIP and found they slept longer, had better quality sleep with fewer wake‑ups, and got a bit more REM sleep, without feeling groggy the next day. The sleep boost started about an hour after the injection and lasted up to six hours.
Banks. W A WA; Kastin. A J AJ; Coy. D H DH
The study shows that the sleep‑inducing peptide DSIP (and a couple of its variants) can move from the bloodstream into the brain fluid of dogs after an IV injection, meaning it does cross the blood‑brain barrier. The peptide sticks to a large protein in the blood, and the free form appears to be what gets into the brain. This suggests DSIP’s effects on sleep and possibly other brain functions are likely due to a real, direct action in the central nervous system.
Kastin. A J AJ; Nissen. C C; Schally. A V AV; Coy. D H DH
A study showed that when a small peptide called delta‑sleep inducing peptide (DSIP) is injected into a rat's bloodstream, some of it can cross the blood‑brain barrier and reach the brain in almost its whole form. This means that giving DSIP outside the brain could still have direct effects inside the brain.
Popovich. I G IG
In mice, several substances—including melatonin, the synthetic peptide Epitalon, the sleep‑inducing peptide Deltaran, the gut‑binding agent Aqualen, and a succinic‑acid mix called Neuronol—slowed age‑related reproductive changes, reduced spontaneous tumor growth, and lengthened lifespan. The benefits varied with the dose given and the genetic background of the mouse strain.
Stanojlovic. O O; Zivanovic. D D; Susic. V V
In a rat study, the natural peptide DSIP (delta‑sleep‑inducing peptide) boosted slow‑wave (delta) brain activity and safely lowered how often and how severe seizures were when the animals were given a seizure‑triggering drug. The peptide crossed the blood‑brain barrier and showed no toxic effects even at high doses.
Steiger. A A; Holsboer. F F
Human studies show that several brain‑derived peptides directly change sleep patterns. Growth‑hormone‑releasing hormone (GHRH) boosts deep sleep and growth hormone while cutting cortisol, whereas corticotropin‑releasing hormone (CRH) does the opposite. Other peptides like galanin, growth‑hormone‑releasing peptide (GHRP), and neuropeptide Y also help sleep, while ACTH(4‑9) and short‑term somatostatin hurt it. Aging and depression shift the balance toward CRH, which may explain poorer sleep in those states.
Mendzheritskiĭ. A M AM; Uskova. N I NI; Lysenko. A V AV; Matsionis. A E AE; Sametskiĭ. E...
In an animal study, giving delta‑sleep‑inducing peptide (DSIP) together with piracetam changed brain chemistry: it boosted the calming neurotransmitter GABA, balanced excitatory and inhibitory amino acids, and helped the animals handle a sudden stress challenge better than either substance alone.