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Environmentally persistent free radicals decrease cardiac function before and after ischemia/reperfusion injury in

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Environmentally persistent free radicals (EPFRs) from 1,2-dichlorobenzene exposure significantly impaired cardiac function and increased inflammation in rats. These findings suggest EPFRs pose a risk to cardiovascular health, especially after ischemia.

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Area of Science:

  • Environmental Science
  • Toxicology
  • Cardiovascular Research

Background:

  • Airborne particles, especially from burning hazardous materials, can form environmentally persistent free radicals (EPFRs).
  • EPFRs are linked to cardiovascular problems, but their direct impact on heart function, particularly after ischemic events, is not well understood.

Purpose of the Study:

  • To investigate the effects of EPFRs, specifically from 1,2-dichlorobenzene (DCB230), on left ventricular function in vivo.
  • To determine if DCB230-induced EPFRs exacerbate cardiac dysfunction following ischemia and reperfusion (I/R).

Main Methods:

  • Male Brown-Norway rats were intratracheally dosed with DCB230-containing particles 24 hours before cardiac function assessment.
  • Cardiac function was evaluated before and after induced ischemia and reperfusion (I/R).
  • Inflammation markers, oxidative stress (8-isoprostane), and cardiac tissue were analyzed.

Main Results:

  • DCB230 treatment significantly decreased both systolic and diastolic cardiac function at baseline.
  • Pulmonary and cardiac inflammation were observed in DCB230-treated rats.
  • Following I/R, DCB230-treated rats showed significantly reduced systolic function, unlike control rats, and increased cardiac oxidative stress.

Conclusions:

  • DCB230-containing EPFRs induce inflammation and impair cardiac function at baseline and after I/R in vivo.
  • EPFRs may represent a significant risk factor for cardiac toxicity in both healthy individuals and those with existing ischemic heart disease.
  • Oxidative stress and inflammatory pathways are potential mechanisms underlying EPFR-induced cardiotoxicity.