Orexin-A to check sleep disorders: Research

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Washington, Jan 4 (UNI) Some sleep reprieval formula seems on the anvil for shift workers, the military and many other occupations where sleep is often cut down due to nature of work a naturally occuring brain peptide orexin-A is administered, a new reserch suggests.

Sleep deprivation effects the cognitive performances pertaining to the mental processes of perception, memory, judgment, and reasoning but all these can be reversed when naturally occuring brain peptide orexin-A is administered in the body, Science Daily reported.

The test was found succesful on monkeys.

''These findings are significant because of their potential applicability,'' said Samuel A Deadwyler, professor of physiology and pharmacology at Wake Forest.

''This could benefit patients suffering from narcolepsy and other serious sleep disorders. But it also has applicability to shift workers, the military and many other occupations where sleep is often limited, yet cognitive demand remains high,'' he added.

Orexin-A, also known as hypocretin-1, is a naturally occurring peptide produced in the brain that regulates sleep. It's secreted by a small number of neurons but affects many brain regions during the day and people who have normal amounts of orexin-A are able to maintain wakefulness.

When people or animals are sleep-deprived, the brain attempts to produce more orexin-A, but often without enough success to achieve alertness past the normal day-night cycle.

The scientists studied the effects of orexin-A on monkeys that were kept awake overnight for 30 to 36 hours with videos, music, treats and interaction with technicians, until their normal testing time the next day.

They were then allowed to perform their trained tasks with several cognitive problems that varied in difficulty, and their performance was significantly impaired.

The research team consisted of Linda Porrino, and Robert Hampson also of Wake Forest, and Jerome Siegel, of the University of California at Los Angeles.

However, if the sleep deprived monkeys were administered orexin-A either intravenously or via a nasal spray immediately prior to testing, their cognitive skills improved to the normal, non-sleep-deprived, level.

The researchers also noted that when the monkeys received the orexin-A via the intranasal spray they tested higher than when it was administered intravenously.

''Assessments of the monkeys' brain activity during testing through noninvasive imaging techniques also showed improvement by orexin-A which returned to its normal non-sleep-deprived pattern during performance of the task,'' said Professor Deadwyler.

''In addition, we observed orexin-A at moderate dose levels had no effect on performance if the animals were not sleep-deprived,'' he said.

UNI XC SZ DB1341

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