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Stochastic Model of T Cell Repolarization during Target Elimination I
1Center for Biophysics (ZBP) and Department of Theoretical Physics, Saarland University, Saarbrücken, Germany.
Biophysical Journal
|March 5, 2020
Summary
This study models how cytotoxic T lymphocytes and natural killer cells move their internal structures to attack target cells. The findings suggest a "capture-shrinkage" mechanism is dominant, working with other forces for efficient cell polarization.
Area of Science:
- Immunology and Cell Biology
- Biophysics and Computational Biology
Background:
- Cytotoxic T lymphocytes (T cells) and natural killer (NK) cells eliminate infected or cancerous cells via an immunological synapse (IS).
- Cell polarization involves microtubule (MT) cytoskeleton reorganization, moving the MT organizing center (MTOC) and organelles towards the IS.
- The precise molecular mechanisms driving this MT-dependent organelle relocation remain largely unknown.
Purpose of the Study:
- To develop a theoretical model for molecular-motor-driven MT cytoskeleton motion during T cell polarization.
- To analyze and compare the 'cortical sliding' and 'capture-shrinkage' mechanisms for MTOC repositioning.
- To investigate the role of dynein motors and their localization in T cell activation.
Main Methods:
- Development of a theoretical model simulating MT cytoskeleton dynamics and MTOC movement.
- Analysis of motor-driven MT motion confined between the plasma membrane and nucleus.
- Comparison of model predictions with experimental data on MTOC position and MT cytoskeleton morphology.
Main Results:
- The model predicts a biphasic MTOC repositioning, consistent with experimental observations.
- The 'capture-shrinkage' mechanism is confirmed as dominant over 'cortical sliding' when MTOC and IS are opposed.
- Synergistic action of both mechanisms reduces cellular resource requirements; dynein localization enhances MT interaction.
Conclusions:
- The study elucidates the molecular mechanisms underlying T cell polarization and organelle repositioning.
- The developed model provides a framework for inferring dynein distribution from MT cytoskeleton dynamics.
- This work advances our understanding of immune cell cytotoxic function and cytoskeletal regulation.
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