Related Experiment Video
Updated: May 18, 2026
07:35
Aggravation of Myocardial Ischemia upon Particulate Matter Exposure in Atherosclerosis Animal Model
Published on: December 10, 2021
Air pollution particulate matter collected from an Appalachian mountaintop mining site induces microvascular
Travis L Knuckles1, Phoebe A Stapleton, Valerie C Minarchick
1Center for Cardiovascular and Respiratory Sciences, West Virginia University School of Medicine, Morgantown, West Virginia, USA.
Microcirculation (New York, N.Y. : 1994)
|September 12, 2012
Summary
Exposure to Mountaintop Mining particulate matter (PM(MTM)) impairs blood vessel function, potentially contributing to cardiovascular disease in mining regions. This study investigated PM(MTM)
Area of Science:
- Environmental Health
- Cardiovascular Physiology
- Toxicology
Background:
- Air pollution, specifically particulate matter (PM), is linked to cardiovascular disease.
- Appalachia has high rates of cardiovascular disease, with potential contributions from mining-related PM.
- The cardiovascular effects of PM from mountaintop mining (PM(MTM)) are not well understood.
Purpose of the Study:
- To investigate the cardiovascular consequences of inhaling PM(MTM).
- To identify potential causal links between PM(MTM) exposure and cardiovascular dysfunction.
Main Methods:
- Particulate matter (PM) was collected near an active mountaintop mining (MTM) site.
- PM(MTM) (primarily PM10, rich in sulfur and silica) was intratracheally instilled into adult male rats.
- Vascular function was assessed using intravital microscopy and isolated arteriole experiments 24 hours post-exposure.
Main Results:
- PM(MTM) exposure significantly reduced endothelium-dependent dilation in mesenteric (26%) and coronary (25%) arterioles.
- Endothelium-independent dilation was also impaired.
- In vivo, PM(MTM) exposure caused a 60% reduction in endothelium-dependent arteriolar dilation.
- Alpha-adrenergic receptor blockade altered vasoconstriction in exposed animals.
Conclusions:
- PM(MTM) exposure impairs microvascular function in various vascular beds.
- These impairments involve nitric oxide (NO)-mediated dilation and sympathetic nervous system influences.
- Microvascular dysfunction induced by PM(MTM) may be a contributing factor to cardiovascular disease in mining-affected areas.
Related Concept Videos
01:19Acid Mine Drainage
Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
01:24Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features
Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...