J Clin Invest. 2020 Oct 1;130(10):5042-5051. doi: 10.1172/JCI137560.
Intermittent hypoxia (IH) is a hallmark manifestation of obstructive sleep apnea (OSA), a widespread disorder of breathing. This Review focuses on the role of hypoxia-inducible factors (HIFs) in hypertension, type 2 diabetes (T2D), and cognitive decline in experimental models of IH patterned after O2 profiles seen in OSA. IH increases HIF-1α and decreases HIF-2α protein levels. Dysregulated HIFs increase reactive oxygen species (ROS) through HIF-1-dependent activation of pro-oxidant enzyme genes in addition to reduced transcription of antioxidant genes by HIF-2. ROS in turn activate chemoreflex and suppress baroreflex, thereby stimulating the sympathetic nervous system and causing hypertension. We also discuss how increased ROS generation by HIF-1 contributes to IH-induced insulin resistance and T2D as well as disrupted NMDA receptor signaling in the hippocampus, resulting in cognitive decline.
间歇性低氧(IH)是阻塞性睡眠呼吸暂停(OSA)的一个显著特征,OSA 是一种广泛存在的呼吸紊乱。本综述重点关注缺氧诱导因子(HIFs)在 OSA 中所见的 O2 模式的 IH 实验模型中高血压、2 型糖尿病(T2D)和认知能力下降中的作用。IH 增加 HIF-1α 并降低 HIF-2α 蛋白水平。失调的 HIFs 通过 HIF-1 依赖性激活促氧化剂酶基因增加活性氧(ROS),此外,HIF-2 还会降低抗氧化基因的转录。ROS 反过来激活化学感受器反射并抑制压力感受器反射,从而刺激交感神经系统并导致高血压。我们还讨论了 HIF-1 引起的 ROS 生成如何导致 IH 诱导的胰岛素抵抗和 T2D 以及海马中 NMDA 受体信号的破坏,从而导致认知能力下降。