Immune Cell Migration Models Synergize Nuclear Piston, Uropod, and Microenvironment into Hydraulic Cell Engine

Area of Science:

• Biophysics
• Cell Biology
• Immunology

Background:

• Lymphocytes (NK, B, and T cells) migrate through tissues for immune surveillance.
• The nucleus and uropod are key structures influencing lymphocyte migration dynamics.
• Understanding the biomechanics of immune cell navigation in dense tissues is crucial.

Purpose of the Study:

• To model the biomechanical contributions of cellular structures to lymphocyte migration.
• To investigate the role of the nucleus and uropod in navigating confined tissue environments.
• To explore how cell migration mechanics impact immune surveillance efficiency.

Main Methods:

• Utilized bead-spring and agent-based cell modeling techniques.
• Simulated interactions between lymphocytes and extracellular matrix obstacles.
• Analyzed the biomechanical functions of the nucleus, uropod, septins, and cytoskeleton.

Main Results:

• Proposed a model where septins form cortical rings, creating pressure to propel the nucleus.
• Demonstrated the nucleus acts as a hydraulically driven piston for enhanced migration.
• Showed the uropod stabilizes directional persistence, preventing T cell repolarization and boosting surveillance.

Conclusions:

• The nucleus is an active component of the lymphocyte migratory engine.
• The uropod functions as a crucial locomotion stabilizer.
• These models provide a framework for engineering immune cell motility with applications in cancer immunotherapy, aging, and regenerative medicine.