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Polar stimulation and constrained cell migration in microfluidic channels.

Daniel Irimia¹, Guillaume Charras, Nitin Agrawal

¹BioMEMS Resource Center, Center for Engineering in Medicine and Surgical Services, Massachusetts General Hospital, Shriners Hospital for Children, and Harvard Medical School, Boston, MA, USA. dirimia@hms.harvard.edu

|November 22, 2007

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Researchers developed a microfluidic platform for targeted cell stimulation, enabling new insights into how cells respond to spatial signals during movement. This technology precisely delivers stimuli to the front or back of cells, mimicking tissue environments.

Area of Science:

Cellular Biology
Microfluidics
Biotechnology

Background:

Perturbing spatially-heterogeneous intracellular signaling in moving cells presents significant experimental challenges.
Existing technologies inadequately address the need for asymmetrical stimuli delivery to dynamic cellular systems.

Purpose of the Study:

To introduce a novel microfluidic platform for localized and asymmetrical stimulation of moving cells.
To enable precise perturbation of spatially-heterogeneous intracellular signaling pathways in crawling cells.
To investigate cell behavior and signaling responses in a controlled microenvironment mimicking tissue constraints.

Main Methods:

Development of a robust microfluidic device with a novel flow-balancing design.
Utilizing narrow channels that are completely occluded by cells to constrain morphology.

Related Experiment Videos

Asymmetrical delivery of stimuli to the front and/or back of individual moving cells.

Observation and analysis of neutrophil chemotaxis under constrained and stimulated conditions.

Main Results:

The microfluidic platform successfully achieved localized treatment of the front and/or back of moving cells.
A novel passive flow-balancing technique ensured precise fluid stream manipulation within the device.
Constrained cell morphology within microchannels induced significant changes in neutrophil chemotaxis.
The observed cellular responses mimicked behaviors relevant to cells navigating through biological tissues.

Conclusions:

The developed microfluidic platform offers a robust solution for asymmetrical cell stimulation.
This technology provides a powerful tool for studying intracellular signaling in dynamic, spatially-defined contexts.
The findings demonstrate the platform's utility in mimicking and investigating cell behavior within tissue-like microenvironments.