Related Experiment Video
Updated: May 4, 2026
09:14
Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
Published on: June 13, 2014
14.7K
Adhesion-dependent modulation of actin dynamics in Jurkat T cells
King Lam Hui1, Sae In Kwak, Arpita Upadhyaya
1Department of Physics, University of Maryland, College Park, Maryland, 20742.
Cytoskeleton (Hoboken, N.J.)
|January 3, 2014
Summary
T cell activation involves actin cytoskeleton dynamics. Integrin ligation by VCAM alters actin reorganization, influencing cell spreading and signaling microclusters during T cell contact.
Area of Science:
- Immunology
- Cell Biology
- Biophysics
Background:
- T cell activation is crucial for adaptive immunity.
- Cytoskeleton reorganization, particularly actin dynamics, is vital for T cell activation.
- Early-stage actin dynamics and their correlation with signaling microclusters remain poorly understood.
Purpose of the Study:
- To investigate actin cytoskeleton dynamics during Jurkat T cell spreading.
- To elucidate the role of integrin ligation via VCAM in modulating actin dynamics.
- To understand the interplay between TCR signaling, actin patterns, and integrin signaling.
Main Methods:
- Total internal reflection fluorescence microscopy (TIRFM) was employed.
- Jurkat T cells were studied on anti-CD3 antibody-coated surfaces.
- The effect of VCAM addition on cell spreading and actin dynamics was analyzed.
Main Results:
- T cell spreading on anti-CD3 surfaces showed actin waves driving cell edge protrusions and retractions from signaling microclusters.
- VCAM addition resulted in smooth cell edge expansion and abolished actin waves.
- Actin cytoskeleton exhibits spatial patterning initiated by TCR and regulated by integrin signaling.
Conclusions:
- The actin cytoskeleton in T cells can form spatial patterns driven by TCR signaling.
- Integrin signaling, specifically through VCAM, modulates these actin dynamics during cell spreading.
- Understanding these dynamics provides insights into T cell activation and immune synapse formation.
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