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[Action of actinomycin D on Euglena gracilis ultrastructure]
Tsitologiia
|February 1, 1982
Summary
Actinomycin D, an RNA synthesis inhibitor, alters Euglena gracilis cell structures. High doses rapidly induce significant nuclear, chloroplast, and mitochondrial damage.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Actinomycin D is a known inhibitor of RNA synthesis.
- Euglena gracilis is a model organism for studying cellular responses to environmental stressors.
Purpose of the Study:
- To investigate the ultrastructural effects of actinomycin D on Euglena gracilis.
- To determine the dose-dependent and time-course of these effects.
Main Methods:
- Exposure of Euglena gracilis to 1 and 10 µg/ml concentrations of actinomycin D.
- Ultrastructural analysis using electron microscopy over a 48-hour period.
Main Results:
- Actinomycin D induced rapid and dose-dependent ultrastructural changes in Euglena gracilis.
- Observed effects included nuclear chromatin condensation, nucleolar fragmentation, chloroplast swelling, lamellar disorganization, and mitochondrial matrix compression.
- Higher actinomycin D concentrations led to more pronounced and faster-onset alterations.
Conclusions:
- Actinomycin D significantly disrupts the ultrastructure of Euglena gracilis, affecting key organelles.
- The study highlights the sensitivity of Euglena gracilis to RNA synthesis inhibition at the ultrastructural level.