Delta-sleep inducing peptide and neuronal activity after glutamate microiontophoresis: the role of NMDA-receptors.
Sudakov. Konstantin V. KV; Umriukhin. Pavel E. PE; Rayevsky. Kirill S. KS
Key Findings
- DSIP micro‑delivery activated neurons in several brain areas, notably the dorsal hippocampus and ventral anterior thalamic nucleus.
- Pre‑treating with DSIP prevented the glutamate‑induced increase in neuronal firing in those regions.
- Blocking NMDA receptors with MK‑801 lowered the number of neurons that responded to DSIP, implying DSIP’s actions involve NMDA receptors.
Practical Outcomes
- For DIY biohackers, the study shows DSIP can affect brain activity via NMDA pathways, but it offers no human dosing guidance or clear health benefits. Until human data emerge, DSIP should be considered a research tool rather than a proven supplement for sleep, cognition, or performance.
Summary
In rats, a tiny amount of the peptide called DSIP (delta‑sleep inducing peptide) can change brain cell activity, especially in the hippocampus and thalamus. When DSIP was given before a glutamate stimulus, it stopped the usual spike in activity, and blocking NMDA receptors reduced DSIP's own effects, suggesting DSIP works through those receptors.
Abstract
The influence of microiontophoretic application of delta-sleep inducing peptide (DSIP) on a neuronal activity of sensorimotor brain cortex, dorsal hippocampus, ventral anterior thalamic nucleus and lateral hypothalamus was studied under the effects of glutamate and MK-801, a N-methyl-d-aspartate non-competitive antagonist, on male Wistar rats. DSIP microiontophoresis predominantly activated neurons of various brain regions, in particular, dorsal hippocampus and ventral anterior thalamic nucleus. A preliminary DSIP microiontophoresis prevented the augmentation of a neuronal activity in the studied structures under glutamate microiontophoresis. After MK-801 microiontophoresis the number of neurons activated by the DSIP significantly decreased. It is suggested that DSIP effects on the neuronal activity in the sensorimotor brain cortex, dorsal hippocampus, ventral anterior thalamic nucleus and lateral hypothalamus might be mediated by the NMDA-receptors.
Study Information
pubmed
2004
10.1016/j.pathophys.2004.03.003