Study summary · research use only
Structure-activity relationship in the effects of delta-sleep-inducing peptide (DSIP) on rat sleep
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This study in rats examined the structure-activity relationship of delta-sleep-inducing peptide (DSIP) and its analogues [D-Trp1]-DSIP, [D-Tyr1]-DSIP, and [D-Trp1]-DSIP1-6 on sleep, injected intracerebroventricularly (7 nmol/kg) at dark onset and assessed over the following 12-hr dark and 12-hr light periods versus artificial CSF injections. DSIP itself did not increase sleep, while [D-Trp1]-DSIP and [D-Tyr1]-DSIP promoted sleep early in the night; [D-Trp1]-DSIP1-6 produced a prompt arousing effect instead. The authors suggest the sleep-promoting analogues act by facilitating existing sleep tendencies after dark onset, while DSIP is degraded quickly, and that the results support the idea that the active DSIP molecule has a pseudo-cyclic structure.
Abstract
DSIP and its analogues, [D-Trp1]-DSIP, [D-Tyr1]-DSIP, and [D-Trp1]-DSIP1-6, were injected ICV (7 nmol/kg) into rats at dark onset, and the sleep-wake activity was recorded during the 12-hr dark period and the subsequent 12-hr light period. The effects were evaluated with respect to baseline records obtained after artificial CSF injections. DSIP did not increase sleep, whereas both [D-Trp1]-DSIP and [D-Tyr1]-DSIP promoted sleep in the first part of the night. [D-Trp1]-DSIP1-6 had a prompt arousing effect. It is suggested that the sleep-promoting analogues act by facilitating slight endogenous sleep tendencies at some time after dark onset, while DSIP is degraded quickly and is therefore not effective. The increase of W after [D-Trp1]-DSIP1-6 may indicate that DSIP contains a fragment with an arousing effect. The results corroborate the notion that the active DSIP molecule has a pseudo-cyclic structure.
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