[Nootropic and analgesic effects of Semax following different routes of administration].
Manchenko. D M DM; Glazova. N Iu NIu; Levitskaia. N G NG; Andreeva. L A LA; Kamenskiĭ. A A AA; Miasoedov. N F NF
Key Findings
- Semax given intraperitoneally improves both cognition (learning) and pain tolerance in rats.
- Intranasal Semax is more potent for enhancing learning than intraperitoneal delivery.
- Intranasal Semax does not produce analgesic (pain‑relieving) effects, unlike the injected form.
Practical Outcomes
- For self‑experimenters, intranasal Semax could be explored as a non‑invasive way to boost cognitive performance, but it likely won’t help with pain relief. The study suggests that dosing and route matter, so any human trials should start with low nasal doses and monitor effects. Because the data are from rats, safety and efficacy in people remain uncertain and should be approached cautiously.
Summary
In rats, the peptide Semax improves learning and reduces pain when given by injection into the belly (intraperitoneal). When sprayed into the nose (intranasal), it boosts learning even more, but it doesn't help with pain. The way the drug works depends on how it’s taken, hinting at different brain pathways.
Abstract
Heptapeptide Semax (MEHFPGP) is the fragment of ACTH(4-10) analogue with prolonged neurotropic activity. The aim of the present work was to study the Semax effects on learning capability and pain sensitivity in white rats following intraperitoneal and intranasal administration in different doses. Semax nootropic effects were studied in the test of acquisition of passive avoidance task. Pain sensitivity was estimated in Randall-Selitto paw-withdrawal test. It was shown that Semax exerts nootropic and analgesic activities following intraperitoneal administration. Analysis of dependence of these effects on dose resulted in different dose-response curves. Following intranasal administration, Semax was more potent in learning improvement compared to intraperitoneal administration. The peptide failed to affect the animal pain sensitivity following intranasal administration as opposed to intraperitoneal administration. The data obtained suggest different mechanisms and brain structures involved in realization of the nootropic and analgesic effects of Semax.
Study Information
pubmed
2010