Involvement of spinal noradrenergic system in the mechanism of an antinociceptive effect of delta-sleep-inducing peptide (DSIP).
Nakamura. A A; Sugao. T T; Yamaue. K K; Kobatake. M M; Shiomi. H H
Key Findings
- DSIP injected into the brain reduces pain responses in mice (tail‑pinch and hot‑plate tests).
- Depleting monoamines with reserpine removes DSIP’s antinociceptive effect.
- Blocking spinal alpha‑adrenergic receptors (with phentolamine or yohimbine) also blocks DSIP’s pain‑relief, while a serotonin blocker does not.
- The results point to the spinal noradrenergic pathway as the main route for DSIP’s analgesic action.
Practical Outcomes
- DSIP appears to relieve pain by activating spinal noradrenaline pathways, suggesting a possible mechanism for its analgesic effects. However, the study used brain‑ventricular injections in mice, which isn’t a feasible method for self‑administration, and no human dosing data are provided. For biohackers, the finding is interesting but not yet actionable for real‑world protocols; more research is needed before considering DSIP for pain management or performance enhancement.
Summary
In mice, a peptide called delta‑sleep‑inducing peptide (DSIP) can lessen pain, but it only works when the brain’s descending noradrenaline (noradrenergic) system is intact. If the body’s monoamine stores are depleted or if spinal alpha‑adrenergic receptors are blocked, DSIP’s pain‑relief disappears. Serotonin doesn’t seem to play a role.
Abstract
We studied whether the antinociceptive effect produced by intracerebroventricular injection of delta-sleep-inducing peptide (DSIP) to mice involved the monoaminergic pathways that descended from brainstem to spinal cord (the descending inhibitory systems). In the tail-pinch test, the antinociceptive effect of DSIP was significantly reduced by the pretreatment with reserpine (3 mg/kg i.p.) which depleted endogenous monoamines. Moreover, the intrathecal injections of monoamine antagonists were performed to evaluate the roles of the spinal noradrenergic and/or serotonergic systems in the production of the DSIP antinociception. In both tail-pinch and hot plate tests, the antinociceptive effect of DSIP was significantly antagonized by the previous intrathecal administration of phentolamine (an alpha-adrenergic blocker) or yohimbine (an alpha 2-adrenergic blocker), but was unaffected by the pretreatment with methysergide (a serotonin antagonist). These results demonstrate that the activation of the descending inhibitory systems, mainly spinal noradrenergic systems, is involved in the elicitation of DSIP antinociception.
Study Information
pubmed
1989
1989-02-20T00:00:00.000Z
10.1016/0006-8993(89)91569-2
2
22