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Accurate and Simple Measurement of the Pro-inflammatory Cytokine IL-1β using a Whole Blood Stimulation Assay
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Release of IL-1 β triggered by Milan summer PM10: molecular pathways involved in the cytokine release

Rossella Bengalli1, Elisabetta Molteni, Eleonora Longhin

  • 1Polaris Research Centre, Department of Environmental Sciences and Earth Sciences, University of Milano-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy.

Biomed Research International
|March 20, 2013
PubMed

Insights

Particulate matter (PM) exposure triggers inflammation. Milan PM10 activates Toll-like receptors (TLRs) and the NLRP3 inflammasome, significantly increasing interleukin-1 beta (IL-1β) release, especially via oxidative stress.

Area of Science:

  • Environmental Health
  • Immunology
  • Toxicology

Background:

  • Particulate matter (PM) exposure is linked to pulmonary and cardiovascular diseases due to heightened inflammatory responses.
  • Interleukin-1 beta (IL-1β) release, a key proinflammatory cytokine, is regulated by Toll-like receptors (TLRs) and the NLRP3 inflammasome pathway.

Purpose of the Study:

  • To investigate the capacity of Milan PM10 to induce IL-1β release.
  • To examine the roles of TLRs and NLRP3 inflammasome activation in PM10-induced IL-1β release.
  • To explore the involvement of oxidative stress in the inflammatory response to PM10.

Main Methods:

  • THP-1-derived macrophages were exposed to Milan PM10 (2.5 μg/cm² for 6 hours).
  • The study utilized caspase-1, TLR-2, and TLR-4 inhibitors to assess their impact on IL-1β release.
  • Oxidative stress inhibition was employed to evaluate its effect on PM10-induced IL-1β production.

Main Results:

  • Summer Milan PM10 induced a significant 50-fold increase in IL-1β release without lipopolysaccharide (LPS) priming.
  • Caspase-1 inhibition reduced IL-1β release by 91%, while TLR-2 and TLR-4 inhibitors decreased it by 66% and 53%, respectively.
  • PM10 exposure increased early endosomes, and oxidative stress inhibition nearly abolished IL-1β release (90% inhibition).

Conclusions:

  • Summer PM10 contains constituents that activate membrane TLRs and the NLRP3 inflammasome, driving IL-1β release.
  • TLR activation is crucial for the magnitude of the PM10-induced inflammatory response.
  • Reactive oxygen species (ROS) formation plays a significant role in PM10-induced IL-1β release, though the precise molecular pathway requires further investigation.

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