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A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
Published on: October 15, 2013
Analysis of intercellular communication by flexible hydrodynamic gating on a microfluidic chip
Peng Chen1, Pu Chen, Xiaojun Feng
1Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics-Hubei Bioinformatics, Systems Biology Theme, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.
This study introduces a microfluidic chip for precisely stimulating cells and observing intercellular calcium (Ca2+) waves. The method enables accurate analysis of cell-to-cell communication without affecting neighboring cells.
Area of Science:
- Cell Biology
- Biophysics
- Microfluidics
Background:
- Intercellular calcium (Ca2+) waves are crucial for cell communication, often triggered by chemical stimuli.
- Existing methods struggle with localized cell stimulation, risking interference with adjacent cells.
- Understanding Ca2+ wave propagation is vital for deciphering complex cellular signaling networks.
Purpose of the Study:
- To develop a novel microfluidic method for precise, localized chemical stimulation of cells.
- To investigate the dynamics of intercellular Ca2+ signal propagation with minimal diffusion interference.
- To analyze the mechanisms underlying Ca2+ wave transmission between contacting cells.
Main Methods:
- Fabrication of a cross-patterned polydimethylsiloxane microfluidic chip.
- Utilizing a hydrodynamic gating technique for localized adenosine 5'-triphosphate (ATP) stimulation.
- Seeding NIH-3 T3 cells downstream of the microchannel intersection to confine diffusion.
- Monitoring Ca2+ transients and wave propagation using fluorescence imaging.
Main Results:
- Localized ATP stimulation successfully initiated intercellular Ca2+ waves in targeted cell clusters.
- Confined lateral diffusion minimized unwanted stimulation of neighboring cells.
- Inhibition studies confirmed that Ca2+ signal propagation relies on direct cytosolic transfer via gap junctions.
Conclusions:
- The developed microfluidic platform offers a versatile tool for studying intercellular communication dynamics.
- The hydrodynamic gating technique provides precise control over localized cell stimulation.
- Gap junction-mediated cytosolic transfer is essential for intercellular Ca2+ wave propagation in NIH-3 T3 cells.
