Phosphorylated Delta Sleep Inducing Peptide Improves Memory and Sleep at High Altitude

Exposure to high altitude often leads to cognitive impairment, particularly affecting spatial memory, and significant disruptions in sleep architecture. These physiological challenges can severely impact performance and well-being in individuals ascending to high altitudes, posing risks for various professions and recreational activities. This study specifically investigates whether a modified sleep-inducing peptide can mitigate these adverse effects on memory and sleep quality under hypoxic conditions.

The study found that p-DSIP treatment significantly improved sleep architecture in high-altitude exposed rats, leading to a marked increase in non-rapid eye movement (NREM) sleep duration and a significant reduction in rapid eye movement (REM) sleep and wakefulness, effectively restoring sleep patterns closer to those observed in normoxic conditions (p<0.05). > p-DSIP treatment completely restored spatial memory deficits in high-altitude exposed rats, with their performance in the Morris water maze becoming indistinguishable from sea-level controls (p<0.01), indicating a full reversal of cognitive impairment. Furthermore, p-DSIP treatment significantly increased hippocampal p-CREB expression, a key protein involved in memory consolidation, which was markedly reduced by high altitude exposure (p<0.05). The peptide also attenuated oxidative stress by reducing levels of malondialdehyde (MDA) and nitric oxide (NO) and increasing the activity of critical antioxidant enzymes like superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) (p<0.05), suggesting a neuroprotective mechanism.