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Cytochalasins induce actin polymerization in human leukocytes.
K M Rao1, J Padmanabhan, H J Cohen
1Geriatric Research, Education and Clinical Center, VA Medical Center, Durham, NC 27705.
Cell Motility and the Cytoskeleton
|January 1, 1992
Summary
Cytochalasins increase F-actin in human cells, but their mechanism is complex. Cellular ATP levels, influenced by glycolysis, regulate actin dynamics and cytochalasin effects.
Area of Science:
- Cell Biology
- Biochemistry
Background:
- Actin dynamics are crucial for cellular functions.
- Cytochalasins are known disruptors of actin polymerization.
Purpose of the Study:
- To investigate the effects of cytochalasins (B, D, E) on F-actin and G-actin content in human neutrophils and lymphocytes.
- To explore the influence of cellular energy levels on cytochalasin-induced actin changes.
Main Methods:
- NBD-phallacidin labeling and flow cytometry for F-actin quantification.
- DNase I inhibition assay for G-actin measurement.
- Treatment with cytochalasins and 2-deoxyglucose.
Main Results:
- All tested cytochalasins increased F-actin and decreased G-actin in a dose- and time-dependent manner.
- Potency order: cytochalasin D > E > B.
- 2-deoxyglucose inhibited basal F-actin and cytochalasin-induced F-actin.
- Actin state in intact cells is regulated by ATP levels and glycolysis.
Conclusions:
- Cytochalasin action in intact cells is more complex than in purified systems, potentially involving other actin-binding proteins.
- Cellular ATP levels, maintained by glycolysis, are critical regulators of actin dynamics and cytochalasin efficacy.