Delta sleep inducing peptide inhibits somatostatin release via a dopaminergic mechanism.
Iyer. K S KS; McCann. S M SM
Key Findings
- DSIP reduces somatostatin release from the hypothalamus in a dose‑dependent manner, with maximal inhibition at ~10⁻⁸ M.
- Male rat tissue is more sensitive to DSIP’s effect than female tissue.
- The inhibitory effect of DSIP is blocked by the dopamine antagonist pimozide, indicating a dopaminergic mechanism.
Practical Outcomes
- For biohackers, this study hints that DSIP might boost growth hormone indirectly by suppressing somatostatin, especially when used at low doses. The sex‑specific sensitivity suggests dosing could differ between men and women, though human data are lacking. Because the effect relies on dopamine signaling, combining DSIP with other dopaminergic agents might amplify the response, but more research is needed before applying this in real‑world protocols.
Summary
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.
Abstract
Delta sleep inducing peptide (DSIP) has been localized in the rat hypothalamus. The effect of DSIP on somatostatin (SRIF) release from the median eminence of the hypothalamus was evaluated in male and female rats in an in vitro incubation system. DSIP inhibited SRIF release in a dose-dependent manner. The median eminences from females were less sensitive to the inhibitory action of DSIP than those of males; however, in both sexes the maximum effect was observed at a concentration of 10(-8) M DSIP. This effect was blocked by addition of pimozide at a concentration of 10(-6) M. Pimozide alone had no effect on SRIF release. These findings lead to the conclusion that DSIP inhibits SRIF release via a dopaminergic mechanism.
Study Information
pubmed
1987
1987-06-01T00:00:00.000Z
10.1159/000124802
12