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Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
Published on: August 7, 2018
Visualization of intracellular calcium during necrotaxis
E Constant1, A Le Negrate, A de Boisfleury-Chevance
1Centre d'Ecologie Cellulaire, Hôpital de la Salpétrière, Paris, France.
Blood Cells
|January 1, 1993
Summary
Granulocytes move towards damaged red blood cells (necrotaxis). This study developed a method to visualize calcium in granulocytes during this process, revealing calcium bursts when the source appears and upon target contact.
Area of Science:
- Cellular Biology
- Immunology
- Biophysics
Background:
- Granulocytes demonstrate positive chemotaxis towards laser-damaged erythrocytes, a process termed necrotaxis.
- Understanding granulocyte behavior during necrotaxis is crucial for immune response research.
Purpose of the Study:
- To develop and utilize a computerized method for visualizing intracellular calcium concentration in granulocytes during necrotaxis.
- To investigate the dynamic changes in granulocyte calcium levels in response to a necrotactic stimulus.
Main Methods:
- Development of a computerized system for real-time fluorescence imaging of intracellular calcium.
- Induction of necrotaxis by laser irradiation of erythrocytes.
- Monitoring granulocyte calcium fluctuations during migration towards the damaged erythrocyte source.
Main Results:
- Observed successive bursts of intracellular calcium fluorescence in granulocytes.
- The first calcium burst occurred approximately 10 seconds after the initiation of the necrotactic source.
- A second calcium burst was detected precisely when the granulocyte made contact with the target (damaged erythrocyte).
Conclusions:
- The developed method effectively visualizes intracellular calcium dynamics in granulocytes during necrotaxis.
- Granulocyte calcium signaling exhibits distinct temporal patterns related to necrotactic source detection and target engagement.
- These findings provide new insights into the cellular mechanisms governing granulocyte migration and immune cell-target interactions.
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