Simple microfluidic device for studying chemotaxis in response to dual gradients

Area of Science:

• Cell Biology
• Microfluidics
• Immunology

Background:

• Chemotaxis, the directed movement of cells along chemical gradients, is crucial for biological processes.
• Understanding neutrophil migration in response to complex chemotactic cues requires advanced in vitro models.
• Existing methods for studying cell migration, particularly neutrophil responses to dual gradients, are often complex and lack versatility.

Purpose of the Study:

• To develop and validate a simple, innovative microfluidic device for studying cell migration under dual chemotactic gradients.
• To investigate neutrophil migration dynamics in a 3D substrate using the developed microfluidic system.
• To assess the device's applicability using a neutrophil-like cell line and subsequently with whole blood.

Main Methods:

• Design and implementation of a novel microfluidic device enabling dual chemotactic gradient generation within a 3D matrix.
• Validation of the device using the neutrophil-like cell line PLB-985 migrating towards gradients of formyl-methionyl-leucyl-phenylalanine (fMLP).
• Application of the device to heparinised whole blood, observing neutrophil migration without prior purification.

Main Results:

• The microfluidic device successfully established and maintained dual chemotactic gradients for cell migration studies.
• PLB-985 cells demonstrated directed migration towards fMLP gradients within the 3D substrate.
• Neutrophils in heparinised whole blood migrated effectively towards fMLP gradients using the device, bypassing the need for isolation.

Conclusions:

• The developed microfluidic device offers a simple and effective platform for studying cell migration in complex chemotactic environments.
• The system accurately recapitulates in vivo-like chemotactic responses of neutrophils.
• This innovative tool facilitates research on neutrophil chemotaxis using whole blood, simplifying experimental procedures.