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Associations between urinary biomarkers of oxidative stress and air pollutants observed in a randomized crossover exposure to steel mill emissions. | LitMetric

AI Article Synopsis

  • A study was conducted to examine the health effects of industrial air pollution, focusing on volunteers exposed to a steel mill for five days compared to a control site five kilometers away.
  • Urinary biomarkers of oxidative stress and DNA damage were measured to assess the impacts, revealing some unexpected results, such as lower levels of oxidative DNA damage at the steel mill site.
  • The findings indicated complex relationships between air pollutants and biological markers, but the implications of these associations are still not fully understood.

Article Abstract

The effects of industrial air pollution on human health have not been as thoroughly investigated as those of urban air pollution which originates mostly from automotive transport. To better assess the health impacts of point sources of industrial air pollution, a randomized crossover exposure study was conducted. Sixty one young and healthy volunteers were randomly assigned to spend five consecutive eight-hour days near a steel mill or at a location five kilometres away. After a nine or sixteen-day washout period, volunteers spent another five consecutive days at the second site. Meteorological conditions and air pollutants were monitored at both exposure sites. On each exposure day, the first morning urine was collected along with a second urine sample obtained immediately before leaving the exposure site at the end of the day. Urinary levels of biomarkers of oxidative stress 8-hydroxy-2'-deoxyguanosine (8-OHdG, a biomarker of oxidative DNA damage), malondialdehyde (MDA, a biomarker of lipid peroxidation), 8-isoprostane (8-IsoP, a bioactive metabolite resulting from the peroxidation of arachidonic acid) and Vascular Endothelial Growth Factor (VEGF, involved in response to oxidative stress) were measured. According to mixed-effects linear regression models, intra-individual variations in 8-OHdG urinary levels were significantly associated with exposure site, but surprisingly, lower levels were observed at the steel mill site. Delayed, temporally-defined associations with specific air pollutants were observed for 8-OHdG, 8-IsoP and VEGF. However, these associations were subtle, presented complex patterns and their biological consequences remain unclear.

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Source
http://dx.doi.org/10.1016/j.ijheh.2016.11.010DOI Listing

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