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Delta Sleep-Inducing Peptide Powder DSIP Increase Sleep CAS:62568-57-4
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Delta sleep-inducing peptide, abbreviated DSIP, is a neuropeptide that when infused into the mesodiencephalic ventricle of recipient rabbits induces spindle and delta EEG activity and reduced motor activities
A first study of DSIP application to humans was carried out in six normal volunteers (four males and two females) under extensive psychophysiologic observations and measurements in a double-blind cross-over design. DSIP was applied as slow intravenous infusions at a dosage of 25 nmol/kg in the morning. The subjects immediately reported a feeling of sleep pressure, and sleep increased by 59% (median of total sleep time) within a 130-min interval after the treatment as compared with placebo.
Delayed effects on subsequent night sleep were shorter sleep onset, reduced percentage of stage 1, and better sleep efficiency. Nevertheless, sophisticated behavioral and EEG analyses revealed no sedation in the classic pharmacologic way. The results suggest that DSIP in humans is also efficacious by sustaining natural sleep functions. The compound was well-tolerated and no psychologic, physiologic, or biochemical side effects were observed.
Synonyms:SLEEP INDUCING PEPTIDE;WAGGDASGE;TRP-ALA-GLY-GLY-ASN-ALA-SER-GLY-GLU;TRP-ALA-GLY-GLY-ASP-ALA-SER-GLY-GLU;TRP-ALA-GLY-GLY-ASP-ALA-SER-GLY-GLU 4H2O;DELTA SLEEP INDUCING PEPTIDE;DELTA SLEEP-INDUCING PEPTIDE 4H2O;DSIP
Roles in endocrine regulation
Decreases basal corticotropin level and blocks its release
Stimulates release of luteinizing hormone (LH)
Stimulates release of somatoliberin and somatotrophin secretion and inhibits somatostatin secretion.
Roles in physiological processes
Can act as a stress limiting factor.
May have a direct or indirect effect on body temperature and alleviating hypothermia.
Can normalize blood pressure and myocardial contraction.
It has been shown to enhance the efficiency of oxidative phosphorylation in rat mitochondria in vitro, suggesting it may have antioxidant effects.
There is also conflicting evidence as to its involvement in sleep patterns. Some studies suggest a link between DSIP and slow-wave sleep (SWS) promotion and suppression of paradoxical sleep, (PS)while some studies show no correlation.Stronger effects on sleep have been noted for the synthesized analogues of DSIP.
It may have an impact on human lens epithelial cell function via the MAPK pathway, which is involved in cell proliferation, differentiation, motility, survival, and apoptosis.
Structure and Interactions
DSIP is an amphiphilic peptide of molecular weight 850 daltons with the amino acid motif:N-Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu-C
It has been found in both free and bound forms in the hypothalamus, limbic system and pituitary as well as various peripheral organs, tissues and body fluids. In the pituitary it co-localises with many peptide and non-peptide mediators such as corticotropin-like intermediate peptide (CLIP), adrenocorticotrophic hormone (ACTH), melanocyte-stimulating hormone (MSH), thyroid-stimulating hormone (TSH) and melanin concentrating hormone (MCH). It is abundant in the gut secretory cells and in the pancreas where it co-localises with glucagon.
In vitro it has been found to have a low molecular stability with a half life of only 15 minutes due to the action of a specific aminopeptidase-like enzyme.It has been suggested that in the body it complexes with carrier proteins to prevent degradation, or exists as a component of a large precursor molecule,but as yet no structure or gene has been found for this precursor.
Evidence supports the current belief that it is regulated by glucocorticoids.
Gimble et al. suggest that DSIP interacts with components of the MAPK cascade and is homologous to glucocorticoid-induced leucine zipper (GILZ).GILZ can be induced by Dexamethasone. It prevents Raf-1 activation, which inhibits phosphorylation and activation of ERK.
Delta sleep-inducing peptide, abbreviated DSIP, is a neuropeptide that when infused into the mesodiencephalic ventricle of recipient rabbits induces spindle and delta EEG activity and reduced motor activities.
Many roles for DSIP have been suggested following research carried out using peptide analogues with a greater molecular stability and through measuring DSIP-like immunological (DSIP-LI) response by injecting DSIP antiserum and antibodies.
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