Study wrapper · #393
[Intranasal epitalon infusion modulates neuronal activity in the rat neocortex].
Editor's note
A near-replicate of the neocortical electrophysiology work elsewhere in this batch, here targeting rat motor cortex. In urethane-anaesthetised male Wistar rats, a 2 ng intranasal dose of epitalon was followed by a rapid 2–2.5-fold rise in spontaneous neuronal firing, sometimes in three phases (peaks at 5–7, 11–12, 17–18 minutes), from both already-active and newly recruited neurons; the first phase was attributed to direct cortical action. The consistency with the neocortex study strengthens the case for acute bioactivity via the intranasal route at nanogram doses. Still, this is an acute anaesthetised-animal recording with no behavioural or clinical endpoint and limited detail in the abstract, from the single-lineage pineal-peptide literature. These are preclinical findings; human data are needed before clinical conclusions can be drawn.
Plain-language abstract
This experiment tested whether epitalon, given into the nose to bypass the blood-brain barrier, affects electrical activity in the rat motor cortex — the brain region controlling movement. In anaesthetised male Wistar rats, researchers recorded the natural firing of individual neurons using fine glass electrodes. After 10–15 minutes of baseline recording, they delivered a very small dose (2 nanograms) into the nose and recorded for 30 more minutes. Within minutes, neuron firing increased about 2 to 2.5 times. In some recordings the response came in three waves, peaking around 5–7, 11–12, and 17–18 minutes. The rise came both from neurons already active firing faster and from previously silent neurons becoming active. The researchers concluded that at least the first wave reflected the peptide acting directly on motor-cortex cells. Only brain-cell electrical activity was measured, not movement or behaviour. This is early animal research.