Fully integrated microfluidic platform enabling automated phosphoprofiling of macrophage response

Area of Science:

• Cellular immunology
• Systems biology
• Microfluidics

Background:

• Understanding immune defense requires monitoring cell signaling pathways.
• Conventional methods like flow cytometry and microscopy are time-consuming and lack integrated data.
• Existing techniques do not correlate protein abundance with subcellular localization.

Purpose of the Study:

• To develop a novel microfluidic platform for rapid, integrated cell signaling analysis.
• To correlate host-pathogen phosphoproteomic data with protein localization.
• To overcome limitations of conventional, stand-alone signaling assays.

Main Methods:

• Development of a monolithic microfluidic phosphoFlow Chip (pFC).
• Integration of cell stimulation, preparation, microscopy, and flow cytometry.
• Monitoring of ERK1/2 and p38 phosphorylation in response to LPS in RAW 264.7 cells.

Main Results:

• pFC achieved host-pathogen phosphoprofiling in 30 minutes, reducing reagent consumption.
• ERK1/2 phosphorylation was detected within 5 minutes of LPS stimulation.
• ERK1/2 phosphorylation correlated with nuclear translocation, observed via microscopy prior to flow cytometry.

Conclusions:

• The pFC platform offers a rapid, integrated approach for cell signaling studies.
• This technology enables correlated analysis of protein phosphorylation and localization.
• pFC represents a step towards automated, high-throughput systems biology infrastructure.