Imaging immune surveillance by T cells and NK cells

Area of Science:

• Immunology
• Cell Biology
• Biophysics

Background:

• Immune cells like T cells and natural killer (NK) cells form immunological synapses (IS) where receptors and ligands organize into specific domains.
• The precise mechanisms governing IS formation and the functional implications of this protein organization remain incompletely understood.

Purpose of the Study:

• To investigate how protein organization within the IS contributes to immune surveillance.
• To elucidate the biophysical principles underlying the construction of these protein-rich domains.
• To compare supramolecular organization in NK cell and T cell IS.

Main Methods:

• Review of molecular mechanisms involved in IS formation, including the roles of the cytoskeleton, protein size-based segregation, and lipid rafts.
• Comparative analysis of protein organization in activating and inhibitory NK cell IS versus activating T cell IS.
• Discussion of novel technological approaches for probing molecular recognition at cell surfaces.

Main Results:

• IS formation involves cytoskeletal dynamics, protein segregation by extracellular domain size, and lipid raft association.
• Comparing different IS types reveals variations in supramolecular organization.
• Advanced imaging techniques, such as measuring fluorophore excited-state lifetime, can provide insights into protein environments within the IS.

Conclusions:

• Understanding the biophysical basis and functional consequences of IS protein organization is crucial for immune surveillance.
• New technologies are needed to further investigate molecular interactions at cell surfaces within the IS.