A novel particulate matter sampling and cell exposure strategy based on agar membrane for cytotoxicity study

Area of Science:

• Environmental Science
• Toxicology
• Materials Science

Background:

• Standardization of atmospheric particulate matter (PM) sampling and extraction is lacking, hindering comparative toxicity assessments.
• Current methods can be complex and may affect the integrity of PM for toxicological analysis.

Purpose of the Study:

• To develop and evaluate a novel, simplified strategy for PM sampling and cell exposure using an agar membrane.
• To compare the efficiency and biological impact of PM extraction from agar membranes versus traditional polytetrafluoroethylene (PTFE) filters.

Main Methods:

• A novel agar membrane was prepared using a simple freeze-drying technique for PM sampling.
• PM was extracted from agar membranes via vortexing with culture medium and from PTFE filters using sonication in water.
• In vitro cytotoxicity assays were performed on macrophage cells exposed to PM extracted by both methods.

Main Results:

• The agar membrane proved to be a reliable material for PM sampling.
• PM extracted from agar membranes exhibited higher in vitro cytotoxicity compared to PM from PTFE filters.
• Analysis revealed more differentially expressed proteins in macrophage cells exposed to PM from agar membranes.

Conclusions:

• The proposed agar membrane-based strategy offers a simple, biocompatible, and low-disturbance method for PM sampling and extraction.
• This novel approach could serve as a valuable alternative for standardized PM toxicity assessment.
• The method facilitates direct cell exposure and enhances the detection of PM's toxicological effects.