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1 Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, Washington State University, Pullman, Washington 99164; and 2 Department of Physiology, The University of Tennessee, Memphis, Tennessee 38163
Proinflammatory cytokines, including
interleukin-1
(IL-1
) and tumor necrosis factor-
, are involved
in sleep regulation. IL-4 is an antiinflammatory cytokine that inhibits
proinflammatory cytokine production. The hypothesis that IL-4 should
attenuate sleep was studied by determining the effects of IL-4 on
rabbit spontaneous sleep. Thirty-six rabbits were used. Four doses of IL-4 (0.25, 2.5, 25, and 250 ng) were injected
intracerebroventricularly during the rest (light) period. One dose of
IL-4 (25 ng) was injected during the active (dark) cycle. Appropriate
time-matched control injections of saline were done in the same rabbits
on different days. The three highest doses of IL-4 significantly
inhibited spontaneous non-rapid eye movement sleep if IL-4 was given
during the light cycle. The highest dose of IL-4 (250 ng) also
significantly decreased rapid eye movement sleep. On the other hand,
IL-4 administered at dark onset had no effect on sleep. The sleep
inhibitory properties of IL-4 provide additional evidence for the
hypothesis that a brain cytokine network is involved in the regulation
of physiological sleep.
non-rapid eye movement sleep; rapid eye movement sleep; electroencephalogram; cytokines; brain temperature
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