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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.
Popov. E M EM
The paper explains a computer‑based way to predict the 3‑D shapes that natural short proteins (peptides) can adopt and how those shapes decide what the peptide does in the body. It suggests that by knowing which shape is active, scientists could design a synthetic version that already has that shape, saving time on trial‑and‑error testing.
Zviagintseva. M A MA; Kosharskaia. I L IL; Ul'ianinskiĭ. L S LS
In a rabbit study, giving the delta‑sleep peptide (DSP) through an IV lowered the heart rate by about 16%. This slowdown was stopped when the animals were given atropine, which blocks the vagus nerve, showing that DSP works through the parasympathetic (vagal) system. The researchers think DSP might protect the heart during stressful situations, but the work was done in animals and used an IV dose that isn’t practical for people.
Aĭrapetiants. M G MG; Gekht. K K; Oeme. P P; Kruglikov. R I RI; Kolomeĭtseva. I A IA
In stressed rats, several peptides—including substance P, eledoisin, and a delta‑sleep peptide—helped calm behavior, lower heart rate and blood pressure, and improve both the amount and quality of deep sleep. The study shows these compounds can reverse stress‑induced sleep problems in animals, but it does not provide human data or clear dosing guidance for people.
Maksimuk. V F VF
A study gave the sleep peptide DSIP to cats and rats and found it cut down the time they spent in REM (dream) sleep more than it lengthened deep, slow-wave sleep. The same kind of REM loss happened when the animals were kept from getting REM naturally, suggesting DSIP taps into very basic sleep control systems.
Dovedova. E L EL; Ashmarin. I P IP
A rabbit study found that giving delta‑sleep‑inducing peptide (DSIP) at 30 µg per kilogram boosts the activity of the enzyme MAO‑A (which breaks down serotonin) in certain brain areas, while having little effect on other enzymes. This hints that DSIP may help regulate sleep by influencing serotonin metabolism, but the work is early‑stage and done in animals.
Monnier. V M VM
Scientists made a three‑amino‑acid peptide (L‑Trp‑L‑Ser‑L‑Glu) that shares the same first building block as the natural sleep‑inducing peptide DSIP. When they injected it into rabbit brains, it did not produce the characteristic increase in slow‑wave (delta) brain activity that DSIP does, showing the effect is specific to DSIP.
Tobler. I I; Borbély. A A AA
In rats, giving Delta Sleep Inducing Peptide (DSIP) or arginine vasotocin (AVT) did not reliably make the animals sleep more or boost the deep‑sleep brain waves. Only tiny, inconsistent changes in activity or brain‑wave power were seen at very high or ultra‑low doses, and the researchers concluded neither peptide works as a specific sleep‑promoting drug.
Huang. J T JT; Lajtha. A A
In rat brain tissue, the sleep‑inducing peptide DSIP breaks down quickly, especially its front‑end tryptophan, and this breakdown speeds up as the brain matures. The best pH for this degradation is about 7.35, and things like morphine or lack of REM sleep don’t change the rate.
Medvedev. V I VI; Bakharev. V D VD; Sargsian. A S AS; Mikhaleva. I I II
A peptide called delta‑sleep‑inducing peptide (DSIP) was tested in rabbits and rats. It boosted slow‑wave brain activity (the deep‑sleep part of the EEG) and helped sleep‑deprived animals learn a maze better, suggesting it might protect the brain from stress and sleep loss. However, the work was done only in animals and no human dosing or safety info is available.
Constantinidis. J J; Bouras. C C; Richard. J J
This review points out that several brain peptides (like substance P, enkephalins, cholecystokinin, etc.) are found at abnormal levels in neuro‑degenerative and psychiatric diseases such as Huntington's, Parkinson's, Alzheimer's, schizophrenia, and addiction. It doesn’t give any dosing or treatment instructions, just describes the changes that happen in disease.
Demin. N N NN; Karmanova. I G IG; Maksimuk. V F VF; Rubinskaia. N L NL
A synthetic peptide called delta‑hypnogenic peptide can force rats to fall asleep, but the sleep it creates is different from natural sleep – the brain cells don’t build up proteins and RNA the way they do during real sleep, and neurons get squeezed, raising protein concentration without the usual growth signals. This pattern looks more like a primitive, immobile state seen in lower animals.
Kovalzon. Vladimir M VM; Strekalova. Tatyana V TV
Delta sleep‑inducing peptide (DSIP) was first found in rabbit blood and thought to help with sleep, but scientists still don’t know its exact structure, gene, or how it works. The review suggests that what we call DSIP might actually be a family of similar peptides, and that the real sleep‑related effects may come from related molecules rather than DSIP itself.
Karlo. Jiro J; Vijay. Arunsree A; Phaneeswar. Mahamkali Sri MS; Singh. Surya Pratap SP
Scientists showed that by feeding bacteria a tiny amount of heavy water (deuterium) and then using Raman spectroscopy, they can see a specific signal (the C‑D band) that tells whether an antibiotic is just stopping growth (bacteriostatic) or actually killing the cells (bactericidal). This method works quickly and doesn’t hurt the bacteria’s normal activity.
Brundin. Lena L; Björkqvist. Maria M; Petersén. Asa A; Träskman-Bendz. Lil L
People who have major depression and have tried suicide have lower levels of a brain chemical called orexin in their spinal fluid compared to people with less severe mood problems. This low orexin is linked to other brain chemicals that affect sleep and stress, but it doesn't seem related to hormones like leptin or thyroid hormone.
Saus. Ester E; Soria. Virginia V; Escaramís. Geòrgia G; Vivarelli. Francesca F; Crespo. Jo...
The study found that a common genetic change (the T version of rs76481776) in the DNA that makes a tiny regulator called miR‑182 is linked to trouble sleeping (late insomnia) in people with major depression. This change makes more miR‑182, which then lowers the activity of several genes, including the one that makes the sleep‑related peptide DSIP. In short, a genetic tweak may reduce DSIP levels and disturb sleep rhythms.
Liu. Min M; Cheetham. Janet J; Cauchon. Nina N; Ostovic. Judy J; Ni. Wenqin W; Ren. Da D; Zhou. Zhao...
Scientists created a new lab test that adds a heavy oxygen atom to a specific protein change called isoaspartic acid, making it show up clearly in mass‑spectrometry data. This lets them spot tiny modifications in peptides like the sleep‑inducing peptide DSIP that were previously hard to detect.
Hrncić. Dragan D; Stanojlović. Olivera O; Zivanović. Dragana D; Susić. Vesel...
In a rat study, a tiny brain peptide called DSIP didn't stop seizures by itself, and a low dose of the anti‑seizure drug valproate (VPA) also didn't work alone. But when the two were given together, the rats took longer before having a seizure, without showing extra motor problems. The brain wave patterns still looked seizure‑like, and there was no extra toxicity.
Stanojlović. Olivera O; Hrncić. Dragan D; Rasić. Aleksandra A; Loncar-Stevanovi&#x...
In a rat study, researchers tested a sleep‑related peptide called DSIP together with the anti‑seizure drug valproate. The combo reduced seizure activity more than either substance alone, but it didn’t completely stop the abnormal brain waves caused by the seizure trigger.
Furuchi. Takemitsu T; Kosugi. Sakurako S; Ohno. Keiko K; Egawa. Tsukasa T; Sekine. Masae M; Katane....
Scientists created a new lab test that uses a fluorescent version of the sleep‑inducing peptide (DSIP) to measure how well cells repair damaged proteins, without needing radioactive materials. The test is very sensitive and can detect tiny amounts of enzyme activity in cell samples.
Stanojlović. Olivera O; Zivanović. Dragana D; Mirković. Slobodan S; Vucević....
In rats, a natural peptide called DSIP and a short version of it lowered the number and severity of seizures caused by a chemical that normally triggers brain convulsions. The peptides also changed brain wave patterns, suggesting they help balance brain activity.