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Effect of chloramphenicol on bacterial endosymbiotes in a strain of Amoeba proteus
Abstract:
The effect of chloramphenicol (CAP) on the bacterial endosymbiotes of a strain of Amoeba proteus was studied by growing the symbiotic amebae in media containing 0.5-1.6 mg/ml CAP for up to 4 weeks. Treatments with CAP caused such ultrastructural changes as expansion of the nuclear zone and deformation of symbiotes. The CAP treatment also damaged the mitochondria, e.g. disappearance of central and protrusion of peripheral cristae. Number of bacteria per ameba decreased to less than 10% of control in CAP-containing media, but no viable amebae became completely free of symbiotes. The results supported previous studies that amebae were dependent on endosymbiotes.
Insights
Chloramphenicol (CAP) treatment altered Amoeba proteus endosymbiotes, causing structural damage and reducing bacterial numbers. However, amebae remained dependent on these essential bacterial symbionts.
Area of Science:
- Microbiology
- Cell Biology
- Symbiosis Research
Background:
- Amoeba proteus harbors bacterial endosymbiotes crucial for its survival.
- Understanding the host-symbiont relationship is key to cell biology.
Purpose of the Study:
- To investigate the effects of chloramphenicol (CAP) on the bacterial endosymbiotes within Amoeba proteus.
- To determine the impact of CAP on amebal ultrastructure and symbiont viability.
Main Methods:
- Amoeba proteus cultures were exposed to varying concentrations of chloramphenicol (0.5-1.6 mg/ml) for up to 4 weeks.
- Ultrastructural changes in amebae and their endosymbiotes were analyzed.
- Bacterial load within amebae was quantified.
Main Results:
- Chloramphenicol induced significant ultrastructural alterations in both the amebae and their endosymbiotes.
- Mitochondrial damage, including cristae deformation, was observed in amebae.
- Bacterial numbers per ameba decreased by over 90% but complete elimination was not achieved.
Conclusions:
- Amoebal endosymbiotes are sensitive to chloramphenicol, exhibiting structural damage and reduced populations.
- Despite CAP treatment, Amoeba proteus remains dependent on its bacterial endosymbiotes for survival.
- These findings reinforce the essential nature of endosymbiosis in this organism.