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Stimulus-dependent actin polymerization in bovine neutrophils
P N Bochsler1, N R Neilsen, D F Dean
1Department of Pathobiology, College of Veterinary Medicine, University of Tennessee, Knoxville 37901.
Inflammation
|August 1, 1992
Summary
Polymorphonuclear leukocytes (PMNs) rapidly polymerize actin within seconds of stimulation, but cellular shape changes occur more slowly. This study quanties actin polymerization and shape change kinetics in bovine PMNs.
Area of Science:
- Immunology
- Cell Biology
Background:
- Polymorphonuclear leukocytes (PMNs) are critical for host defense against pathogens.
- PMN function, including migration and phagocytosis, requires cytoskeletal modulation and shape changes.
Purpose of the Study:
- To demonstrate and quantify actin polymerization in bovine PMNs.
- To examine the kinetics of actin polymerization and cellular shape change in response to different stimuli.
- To compare the temporal relationship between actin polymerization and shape change.
Main Methods:
- Fluorescence flow cytometry was used to analyze actin polymerization.
- Cellular microscopic observations were employed to assess PMN shape change.
- Bovine PMNs were stimulated with ZAS, PAF, and rhC5a.
Main Results:
- Actin polymerization was rapid, near-maximal by 10 seconds and peaking by 30 seconds post-stimulation.
- Maximal increases in F-actin content ranged from 2.3- to 2.8-fold compared to resting cells.
- Cellular shape change was slower, with peak values reached at 120 seconds, and differed temporally from actin polymerization.
Conclusions:
- Actin polymerization is a rapid early event in PMN activation.
- The kinetics of actin polymerization and cellular shape change are distinct.
- These findings provide insights into the dynamic cellular processes underlying PMN function.