Particulate matter, air pollution, and blood pressure

被引:232
|
作者
Brook, Robert D. [1 ]
Rajagopalan, Sanjay [2 ]
机构
[1] Univ Michigan, Div Cardiovasc Med, Ann Arbor, MI 48109 USA
[2] Davis Heart & Lung Res Inst, Columbus, OH USA
关键词
Epidemiology; autonomic nervous system; cardiovascular; concentrated ambient PM2.5; CONCENTRATED AMBIENT PARTICLES; DIESEL-EXHAUST INHALATION; SPONTANEOUSLY HYPERTENSIVE-RATS; CARDIAC OXIDATIVE STRESS; AFFECT VASCULAR FUNCTION; HEART-RATE; CARDIOVASCULAR-DISEASE; SMOKE EXPOSURE; INFLAMMATION; HEALTHY;
D O I
10.1016/j.jash.2009.08.005
中图分类号
R6 [外科学];
学科分类号
1002 ; 100210 ;
摘要
A short-term increase in fine particulate matter air pollution (PM2.5) concentration increases the risk for myocardial infarctions, strokes, and heart failure exacerbations. An important mechanism likely contributing to these associations is an elevation in arterial blood pressure (BP). Exposure to ambient PM2.5 even at present-day concentrations can increase BP within a period of a few days while long-term exposure might also promote the development of chronic hypertension. Controlled human and animal experiments have corroborated the veracity of these findings and elucidated plausible biological mechanisms. PM2.5 deposition within the Pulmonary tree is capable of rapidly triggering autonomic nervous system imbalance, thereby increasing BP within minutes of inhalation. In addition, fine particles can instigate a systemic pro-inflammatory response over a more prolonged period of exposure. Higher circulating levels of activated immune cells and inflammatory cytokines Could consequently cause vascular endothelial dysfunction leading to an imbalance in vascular homeostatic responses. Indeed, chronic PM2.5 exposure augments pro-vasoconstrictive pathways while blunting vasodilator capacity. Finally, certain particle constituents (e.g., metals, organic compounds, and ultra-fine particles) might also be capable of reaching the systemic circulation upon inhalation and thereafter directly impair vascular function. At the molecular level, the generation of oxidative stress with the consequent up-regulation of redox sensitive pathways appears to be a common and fundamental mechanism involved in the instigation of these pro-hypertensive responses. Due to the ubiquitous, continuous and often involuntary nature of exposure, PM2.5 may be an important and under-appreciated worldwide environmental risk factor for increased arterial BP. J Am Soc Hypertens 2009;3(5):332-350. (C) 2009 American Society of Hypertension. All rights reserved.
引用
收藏
页码:332 / 350
页数:19
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