Expression of TASK-1 in brainstem and the occurrence of central sleep apnea in rats.
Recent studies revealed that unstable ventilation control is one of mechanisms underlying the occurrence of sleep apnea. Thus, we investigated whether TASK-1, an acid-sensitive potassium channel, plays a role in the occurrence of sleep apnea. First, the expression of TASK-1 transcriptions on brainstem was checked by in situ hybridization. Then, the correlation between the central apneic episodes and protein contents of TASK-1 measured by western blot was analyzed from 27 male rats. Results showed that TASK-1 mRNAs were widely distributed on the putative central chemoreceptors such as locus coeruleus, nucleus tractus solitarius and medullary raphe, etc. Both the total spontaneous apnea index (TSAI) and spontaneous apnea index in NREM sleep (NSAI) were positively correlated with TASK-1 protein contents (r=0.547 and 0.601, respectively, p<0.01). However, the post-sigh sleep apnea index (PAI) had no relationship with TASK-1 protein. Thus, we concluded that TASK-1 channels may function as central chemoreceptors that play a role in spontaneous sleep apneas in rats.
Wang
Jing
J
Department of Pulmonary Medicine, Peking University First Hospital, Beijing 100034, China.
Zhang
Cheng
C
Li
Nan
N
Su
Li
L
Wang
Guangfa
G
D000818:Animals; D015153:Blotting, Western; D001933:Brain Stem / Q000378:metabolism* / Q000503:physiopathology; D017403:In Situ Hybridization; D008297:Male; D009419:Nerve Tissue Proteins; D009474:Neurons / Q000378:metabolism; D024683:Potassium Channels, Tandem Pore Domain / Q000096:biosynthesis*; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D020182:Sleep Apnea, Central / Q000378:metabolism* / Q000503:physiopathology
D009419:Nerve Tissue Proteins; D024683:Potassium Channels, Tandem Pore Domain; D012333:RNA, Messenger; C420132:potassium channel subfamily K member 3