Sleep deprivation increases cerebral serotonin 2A receptor binding in humans.
Level 3 - non-randomized controlled study
Prospective within-subject pre-post experimental imaging study without a parallel control group.
PubMed 23204604 · doi:10.5665/sleep.2230
What was done
Eighteen healthy volunteers underwent positron emission tomography (PET) with the radiotracer [(18)F]altanserin to measure cerebral serotonin 2A receptor (5-HT(2A)R) binding potentials at baseline and after 24 hours of total sleep deprivation. Binding was analyzed across 13 neocortical regions of interest. Efficacy and compliance were assessed via waking electroencephalography, cognitive performance measurements, and questionnaires.
What was found
A total of 24 hours of sleep deprivation led to a 9.6% increase in neocortical [(18)F]altanserin binding on 5-HT(2A) receptors. Significant region-specific increases occurred in the medial inferior frontal gyrus, insula, anterior cingulate cortex, parietal cortex, sensorimotor cortex, and ventrolateral prefrontal cortex.
Why it matters
This provides in vivo evidence that acute sleep loss rapidly alters human cortical serotonergic receptor availability, establishing a molecular link between sleep loss and cortical neuromodulation.
Limits
The sample size was small (n = 18) and restricted to healthy volunteers. There was no parallel non-deprived control group to rule out circadian or test-retest variations, and PET radiotracer binding changes cannot definitively separate altered receptor density from altered endogenous serotonin competition.
Cited by
- supports Sleep deprivation increases the density of serotonin 2A (5-HT2A) receptors on the surface of the brain.