Analysis of oral microbiota in patients with obstructive sleep apnea-associated hypertension.
Obstructive sleep apnea-hypopnea syndrome (OSAHS) is an independent risk factor for hypertension (HTN). The oral microbiota plays a pathophysiological role in cardiovascular diseases; however, there are few reports directly investigating and identifying the organisms involved in OSAHS-related HTN. Therefore, this study aimed to identify those organisms. We obtained 139 oral samples and determined the microbiome composition using pyrosequencing and bioinformatic analyses of the 16S rRNA. We examined the fasting levels of cytokines and homocysteine in all participants and analyzed the correlations between the oral microbiota and homocysteine levels. We determined the molecular mechanism underlying HTN by investigating the genetic composition of the strains in the blood. We detected higher relative abundances of Porphyromonas and Aggregatibacter and elevated proinflammatory cytokines in patients with OSAHS of varying severity compared with individuals without OSAHS; however, the two organisms were not measured in the blood samples from all participants. High levels of specific Porphyromonas bacteria were detected in patients with OSAHS with and without HTN, whereas the relative abundance of Aggregatibacter was negatively correlated with the homocysteine level. The receiver operating characteristic curve analysis of controls and patients with OSAHS resulted in area under the curve values of 0.759 and 0.641 for patients with OSAHS with or without HTN, respectively. We found that the predictive function of oral microbiota was different in patients with OSAHS with and without HTN. However, there was no direct invasion by the two organisms causing endothelial cell injury, leading to speculation regarding the other mechanisms that may lead to HTN. Elucidating the differences in the oral microbiome will help us understand the pathogenesis of OSAHS-related HTN.
['Ko|Chih-Yuan|CY|', 'Hu|An-Ke|AK|', 'Chou|Dylan|D|', 'Huang|Li-Mei|LM|', 'Su|Huan-Zhang|HZ|', 'Yan|Fu-Rong|FR|', 'Zhang|Xiao-Bin|XB|', 'Zhang|Hua-Ping|HP|', 'Zeng|Yi-Ming|YM|']
D000328:Adult D064206:Aggregatibacter D016022:Case-Control Studies D016207:Cytokines D005260:Female D006710:Homocysteine D006801:Humans D006973:Hypertension D008297:Male D064307:Microbiota D008875:Middle Aged D009055:Mouth D017861:Porphyromonas D020181:Sleep Apnea, Obstructive
oral microbiota hypertension obstructive sleep apnea-hypopnea syndrome homocysteine periodontopathic bacteria