MiR-146a regulates PM₁ -induced inflammation via NF-κB signaling pathway in BEAS-2B cells

Area of Science:

• Environmental Health
• Molecular Biology
• Cell Biology

Background:

• Particulate matter (PM) exposure, particularly PM2.5, is linked to cardiopulmonary diseases via inflammation.
• PM1, with smaller aerodynamic diameter (<1.0 µm), is potentially more toxic than PM2.5, but its inflammatory mechanisms are unclear.
• MicroRNAs (miRNAs) are emerging as key regulators of inflammatory responses.

Purpose of the Study:

• To investigate the role of miR-146a in PM1-induced inflammation in human lung bronchial epithelial BEAS-2B cells.
• To elucidate the molecular mechanisms underlying PM1-induced inflammation and miR-146a regulation.

Main Methods:

• Exposure of BEAS-2B cells to PM1.
• Measurement of IL-6 and IL-8 levels.
• Analysis of miR-146a expression and NF-κB signaling pathway activation.
• Investigation of miR-146a's effect on p65 nuclear translocation and IRAK1/TRAF6 expression.

Main Results:

• PM1 exposure increased IL-6 and IL-8 levels in BEAS-2B cells.
• PM1 upregulated miR-146a expression by activating the NF-κB signaling pathway.
• Overexpression of miR-146a inhibited p65 nuclear translocation by suppressing IRAK1/TRAF6, leading to reduced IL-6 and IL-8 expression.

Conclusions:

• miR-146a acts as a negative feedback regulator in PM1-induced inflammation.
• The miR-146a/NF-κB pathway plays a crucial role in modulating inflammatory responses to PM1 in lung epithelial cells.