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2017 ; 4
(ä): 187
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Changes in Expression of the CLOCK Gene in Obstructive Sleep Apnea Syndrome
Patients Are Not Reverted by Continuous Positive Airway Pressure Treatment
#MMPMID29164122
Moreira S
; Rodrigues R
; Barros AB
; Pejanovic N
; Neves-Costa A
; Pedroso D
; Pereira C
; Fernandes D
; Rodrigues JV
; Barbara C
; Moita LF
Front Med (Lausanne)
2017[]; 4
(ä): 187
PMID29164122
show ga
PURPOSE: Metabolic syndrome and cardiovascular disease are strongly associated
with obstructive sleep apnea syndrome (OSAS), which causes substantial changes to
normal circadian physiological functions, including metabolic pathways. Because
core clock genes are known to be modulated by sleep/vigilance cycles, we asked
whether the expression level of mRNA coding for clock genes is altered in
non-treated OSAS patients and if it can be corrected by standard continuous
positive airway pressure (CPAP) treatment. METHODS: Peripheral blood was
collected from male patients diagnosed with severe OSAS (apnea-hypopnea
index???30/h) before and after treatment initiation. qPCR was used to measure
mRNA levels of genes associated with the central circadian pacemaker including
CLOCK, BMAL1, Cry1, Cry2, and three Period genes (Per 1, 2, 3) in peripheral
blood mononuclear cells (PBMCs). RESULTS: We found statistically significant
differences for CLOCK (p-value?=?0.022) expression in PBMCs of OSAS patients
which were not reverted by treatment with CPAP. We have also found a substantial
decrease in the slow wave sleep (SWS) content in OSAS patients (p-value?0.001)
that, contrary to REM sleep, was not corrected by CPAP (p-value?=?0.875).
CONCLUSION: CPAP treatment does not correct substantial changes in expression of
core clock genes in OSAS patients. Because CPAP treatment is also unable to
normalize the SWS in these patients, it is likely that additional therapeutic
interventions that increase SWS content and complement the benefits of CPAP are
required to more effectively reduce the known increased cardiovascular risk
associated with OSAS patients.