[Effect of delta-sleep inducing peptide on electrical instability of the heart in emotional stress].
Arkhangel'skaia. M I MI; Zviagintseva. M A MA
This study shows that giving  the    ...
DSIP
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.
Electronic Prediction of Chemical Contaminants in Aroma of Brewed Roasted Coffee and Quantification of Acrylamide Levels.
Cascos. Gema G; Montero-Fernández. Ismael I; Marcía-Fuentes. Jhunior Abrahan JA; Aleman. R...
The study shows that the smell of roasted coffee can tell you something about two harmful chemicals – acrylamide and 5‑hydroxymethylfurfural (HMF). A burnt, off‑note aroma means the coffee has less acrylamide but more HMF, while a clean coffee smell means the opposite. An electronic “nose” can pick up these scent cues and predict the toxin levels without lab tests.
Peptides and the blood-brain barrier.
Banks. William A WA
Scientists have shown that many small proteins called peptides can actually get into the brain by crossing the blood‑brain barrier (BBB). This crossing isn’t random – it uses specific transport systems that can get saturated and change with age, health, or disease. Because the BBB can adapt, it can both help and hinder the movement of these molecules, which opens up possibilities for delivering peptide‑based drugs to the brain.
Application of the allyloxycarbonyl protecting group for the indole of Trp in solid-phase peptide synthesis.
Vorherr. T T; Trzeciak. A A; Bannwarth. W W
Scientists showed that adding a special chemical tag called an Aloc group to the tryptophan part of a peptide protects it during the harsh final cleaning steps of peptide making. This tag stops the indole ring from getting damaged, which means the finished peptide—like the sleep‑boosting delta sleep‑inducing peptide (DSIP) and its phosphorylated version—comes out purer and with fewer unwanted side products.
Peptidyl dipeptidase A-catalyzed metabolism of delta sleep-inducing peptide in bovine brain microvessel endothelial cells: a cell culture model of the blood brain barrier.
Augustijns. P F PF; Ng. K Y KY; Williams. T M TM; Borchardt. R T RT
The study shows that the brain‑protective peptide DSIP gets broken down by an enzyme called peptidyl dipeptidase A at the blood‑brain barrier, but this breakdown can be stopped by drugs that block that enzyme (like captopril) and another class of enzymes (using bestatin). In simple terms, DSIP doesn’t stay intact in the brain unless you add specific inhibitors.
Delta-sleep-inducing peptide stimulates melatonin, 5-methoxytryptophol and serotonin secretion from perifused rat pineal glands.
Ouichou. A A; Zitouni. M M; Raynaud. F F; Simonneaux. V V; Gharib. A A; Pévet. P P
The study shows that the peptide delta‑sleep‑inducing peptide (DSIP) can make rat pineal glands release more melatonin, a sleep hormone, as well as serotonin and a related compound. This effect happens at fairly high concentrations, works faster than the classic stimulant isoproterenol, and doesn’t rely on the usual adrenaline or opioid pathways.
Delta sleep-inducing peptide as a factor increasing the content of substance P in the hypothalamus and the resistance of rats to emotional stress.
Salieva. R M RM; Yanovskii. K K; Ratsak. R R; Oeme. P P; Sudakov. K V KV; Yumatov. E A EA
In rats, giving the peptide delta sleep‑inducing peptide (DSIP) raised levels of the brain chemical substance P and lessened typical stress signs like enlarged adrenal glands and shrinking thymus. A single dose before a stressful situation was enough to keep substance P up and reduce stress‑related organ changes.
Ethanol and delta-sleep-inducing peptide: effects on brain monoamines.
Yukhananov. R Y RY; Tennilä. T M TM; Miroshnicenko. T I TI; Kudrin. V S VS; Ushakov. A N AN; Me...
In rats that were either very active or less active in a forced‑swim test, the peptide delta‑sleep‑inducing peptide (DSIP) lowered serotonin levels in a brain area linked to mood and decision‑making, and in the more active rats it boosted a dopamine breakdown product (HVA). When DSIP was given before alcohol, it made alcohol’s drop in serotonin even stronger and changed how alcohol affected another serotonin metabolite. The study suggests DSIP can tweak brain chemicals tied to stress and alcohol response.
In vitro effects of putative neurotransmitters on synaptic ribbon numbers and N-acetyltransferase activity in the rat pineal gland.
Gupta. B B BB; Seidel. A A; Spessert. R R; Büttner. W W; Klauke. N N; Spanier. J J; Weber. A A;...
In a lab test using rat pineal glands, the peptide DSIP (Delta Sleep‑Inducing Peptide) was found to raise the activity of the enzyme that makes melatonin, and it made norepinephrine work even better at doing the same. It didn’t change the number of tiny structures called synaptic ribbons. Other chemicals tested either had no effect or only worked at very high, likely unrealistic doses.
Entry of DSIP peptides into dog CSF: role of physicochemical and pharmacokinetic parameters.
Banks. W A WA; Kastin. A J AJ; Coy. D H DH; Angulo. E E
The study shows that delta sleep‑inducing peptide (DSIP) and several of its modified versions can cross the blood‑cerebrospinal fluid barrier in dogs when given intravenously. How much gets into the brain fluid depends mainly on three things: how high the blood level is, how long the peptide stays in the blood (half‑life), and how oily (lipophilic) the molecule is. Protein binding and size didn’t matter much.
The effects of delta-sleep-inducing peptide (DSIP) on wakefulness and sleep patterns in the cat.
Susić. V V; Masirević. G G; Totić. S S
In a study where a synthetic sleep peptide (DSIP) was injected straight into the brain of cats, the animals fell asleep faster and spent a lot more time in deep, restorative sleep (the S2 stage). Light sleep went down, but REM sleep stayed the same. The effect started within the first hour and lasted for several hours before fading.
Degradation and aggregation of delta sleep-inducing peptide (DSIP) and two analogs in plasma and serum.
Graf. M V MV; Saegesser. B B; Schoenenberger. G A GA
DSIP breaks down fast in blood, turning into small pieces like tryptophan, and this happens faster at higher temperatures and varies between humans and rats. Two modified versions of DSIP, especially the phosphorylated one, stay intact longer and tend to stick together in the blood, which may let them work for a longer time. This suggests that the quick disappearance of regular DSIP is due to degradation, while the analogs linger because they degrade slower and form complexes.
Passage of delta sleep-inducing peptide (DSIP) across the blood-cerebrospinal fluid barrier.
Zlokovic. B V BV; Segal. M B MB; Davson. H H; Jankov. R M RM
The study shows that delta sleep‑inducing peptide (DSIP) can move from the bloodstream into the brain's fluid (CSF) but does so slowly and in limited amounts, and once there it doesn’t get cleared quickly.
In-vitro characterization of blood-brain barrier permeability to delta sleep-inducing peptide.
Raeissi. S S; Audus. K L KL
The study shows that delta sleep‑inducing peptide (DSIP) can move across the blood‑brain barrier on its own, without needing special carriers or transporters. It does this in a straight‑line (linear) way, similar to small water‑soluble molecules, and the peptide stays mostly intact for many hours.
[The use of DSIP (delta sleep-inducing peptide) in the correction of phase-shifted insomnia].
Schneider-Helmert. D D; Hermann. E E; Schoenenberger. G A GA
A 47‑year‑old woman with chronic delayed‑sleep insomnia and low‑dose benzodiazepine dependence was given delta sleep‑inducing peptide (DSIP) for a week in a hospital setting. After treatment her main sleep time moved five hours earlier, she stopped taking flunitrazepam abruptly, and her sleep stayed normal for at least a week after stopping DSIP.
Reduction of immunoreactive ACTH in plasma following intravenous injection of delta sleep-inducing peptide in man.
Bjartell. A A; Ekman. R R; Bergquist. S S; Widerlöv. E E
A single IV dose of the synthetic peptide DSIP lowered the blood levels of ACTH, a hormone that tells the adrenal glands to release stress hormones, for at least three hours. It didn't change cortisol (the main stress hormone) in the blood or urine, and other stress‑related metabolites stayed the same. This shows DSIP can temporarily suppress ACTH secretion in healthy men.
Effects of delta-sleep-inducing peptide on 24-hour sleep-wake behaviour in severe chronic insomnia.
Schneider-Helmert. D D
A small, double‑blind study gave a peptide called DSIP to 14 middle‑aged people with severe chronic insomnia for a week. The participants slept better right away, kept improving with each night, and even the night after stopping the peptide they still slept well. Their daytime alertness and mental performance also went up, reaching levels similar to people without insomnia.
Delta sleep inducing peptide inhibits somatostatin release via a dopaminergic mechanism.
Iyer. K S KS; McCann. S M SM
In rat brain tissue, the peptide called Delta Sleep Inducing Peptide (DSIP) was found to lower the release of somatostatin, a hormone that normally blocks growth hormone. This effect happened at very low concentrations, was stronger in male rats than females, and disappeared when a dopamine blocker (pimozide) was added, suggesting DSIP works through dopamine pathways.
Evidence for a role of delta sleep-inducing peptide in slow-wave sleep and sleep-related growth hormone release in the rat.
Iyer. K S KS; Marks. G A GA; Kastin. A J AJ; McCann. S M SM
In rats, a peptide called delta sleep‑inducing peptide (DSIP) appears to boost deep (slow‑wave) sleep and trigger a spike in growth hormone after a short period of sleep loss. Blocking DSIP stopped these effects, suggesting the peptide naturally helps the body recover sleep and release growth hormone.
DSIP in sleep disturbances.
Schneider-Helmert. D D
A few double‑blind studies found that the peptide DSIP can help people with insomnia sleep better and feel better when they wake up. Both a single shot and repeated shots showed benefits, and one case report even saw improvement in a person with narcolepsy.