BMAL1-Downregulation Aggravates Porphyromonas Gingivalis -Induced Atherosclerosis by Encouraging Oxidative Stress

作者：Mengru Xie, Qingming Tang, Jiaming Nie, Chao Zhang, Xin Zhou, Shaoling Yu, Jiwei Sun, Xiang Cheng, Nianguo Dong, Yu Hu, Lili Chen · 发表于：Circulation Research · 年份：2020 · DOI：10.1161/circresaha.119.315502 · 被引用次数：226 · 研究领域：Biochemical Acid Research Studies、Nitric Oxide and Endothelin Effects、Morinda citrifolia extract uses

Rationale: Atherosclerotic cardiovascular diseases are the leading cause of mortality worldwide. Atherosclerotic cardiovascular diseases are considered as chronic inflammation processes. In addition to risk factors associated with the cardiovascular system itself, pathogenic bacteria such as the periodontitis-associated Porphyromonas gingivalis ( P gingivalis ) are also closely correlated with the development of atherosclerosis, but the underlying mechanisms are still elusive. Objective: To elucidate the mechanisms of P gingivalis -accelerated atherosclerosis and explore novel therapeutic strategies of atherosclerotic cardiovascular diseases. Methods and Results: Bmal1 −/− (brain and muscle Arnt-like protein 1) mice, ApoE −/− mice, Bmal1 −/− ApoE −/− mice, conditional endothelial cell Bmal1 knockout mice ( Bmal1 fl/fl ; Tek -Cre mice), and the corresponding jet-legged mouse model were used. P gingivalis accelerates atherosclerosis progression by triggering arterial oxidative stress and inflammatory responses in ApoE −/− mice, accompanied by the perturbed circadian clock. Circadian clock disruption boosts P gingivalis -induced atherosclerosis progression. The mechanistic dissection shows that P gingivalis infection activates the TLRs-NF-κB signaling axis, which subsequently recruits DNMT-1 to methylate the BMAL1 promoter and thus suppresses BMAL1 transcription. The downregulation of BMAL1 releases CLOCK, which phosphorylates p65 and further enhances NF-κB signaling, elevating ...