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Dynamic changes in viscoelastic properties in cytotoxic T-lymphocyte-mediated killing
K L Sung1, L A Sung, M Crimmins
1Department of Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University, New York, NY 10032.
Journal of Cell Science
|October 1, 1988
Summary
Cytotoxic T lymphocytes alter target cell viscoelasticity during lethal hit delivery. These biophysical changes, including cytoskeletal damage, precede and signal target cell death.
Area of Science:
- Immunology
- Biophysics
- Cell Biology
Background:
- Cytotoxic T lymphocytes (CTLs) are crucial for adaptive immunity.
- Understanding the biophysical mechanisms of CTL-mediated killing is essential.
Purpose of the Study:
- To investigate the biophysical properties of target cells during cytotoxic T lymphocyte-mediated killing.
- To characterize the dynamic changes in target cell viscoelasticity during the cytolytic process.
Main Methods:
- Utilized a human cytotoxic T lymphocyte clone (F1) and a specific target cell line (JY).
- Monitored changes in target cell viscoelastic properties in single cell conjugates.
- Correlated viscoelastic changes with distinct stages of the cytolytic event.
Main Results:
- Conjugation induced significant changes in target cell viscoelasticity.
- Viscoelastic coefficients showed a dynamic pattern: initial increase, return to baseline, decrease, and final rise before lysis.
- Observed nuclear alterations, granule clustering, membrane damage, swelling, and eventual lysis of the target cell.
Conclusions:
- The complex cytolytic event can be staged based on target cell viscoelastic property changes.
- Viscoelastic alterations suggest a loss of integrity in the target cell's cytoskeletal apparatus during CTL killing.
- These findings provide insights into the biophysical mechanisms underlying immune cell-mediated cytotoxicity.