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Related Experiment Videos

PM source apportionment for short-term cardiac function changes in ApoE-/- mice.

Morton Lippmann1, Jiang-Shiang Hwang, Polina Maciejczyk

  • 1New York University School of Medicine, Tuxedo, New York 10987, USA. lippmann@env.med.nyu.edu

Environmental Health Perspectives
|November 3, 2005
PubMed
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Exposure to specific fine particulate matter (PM2.5) components, like resuspended soil and secondary sulfate, impacts heart rate and variability in mice, with effects varying by time of day.

Area of Science:

  • Environmental Health
  • Cardiovascular Toxicology
  • Air Pollution Research

Background:

  • Daily variations in fine particulate matter (PM2.5) are linked to cardiovascular events.
  • Limited understanding exists regarding the impact of specific PM2.5 sources and temporal exposure lags on cardiovascular health.

Purpose of the Study:

  • To investigate the associations between individual PM2.5 source categories and heart rate (HR) and heart rate variability (HRV).
  • To examine the temporal lags of these cardiovascular effects in mice exposed to concentrated ambient PM2.5.

Main Methods:

  • Mice (C57 and ApoE-/- models) were exposed to concentrated ambient PM2.5 (113 microg/m3) for 6 hours/day, 5 days/week.
  • PM2.5 samples were analyzed for source attribution (secondary sulfate, resuspended soil, residual oil combustion, motor vehicle traffic).

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  • Associations between PM2.5 components and HR/HRV were assessed during exposure, the afternoon after, and late at night.

    • Main Results:

    • Significant transient associations were found for resuspended soil (RS) during exposure and secondary sulfate (SS) in the afternoon for HR.
    • Comparable associations with residual oil (RO) in the afternoon and SS and RS late at night were observed for HRV.
    • Temporal lags in cardiovascular effects were evident, with different PM2.5 components affecting HR and HRV at distinct time points.

    Conclusions:

    • Specific PM2.5 components from different sources exhibit distinct temporal associations with cardiovascular parameters (HR and HRV) in mice.
    • The findings suggest that the source and timing of PM2.5 exposure are critical factors in cardiovascular response.
    • Further research is needed to elucidate the biological mechanisms underlying these observed associations and temporal lags.