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Pseudomonas aeruginosa toxins: effect on Ehrlich carcinoma and Vero cells in vitro
1Institute of Preventive and Clinical Medicine, Bratislava, Czechoslovakia.
Abstract:
The main objective of the present investigation was to screen P. aeruginosa toxins for in vitro activity and investigate biochemical mode of action. Toxins were isolated after concentration of the culture filtrate and separation of the filtrate on Sephadex G-100 column in four fractions. On the basis of primary screening results the dialysate and fractions 3 and 4 effectively inhibited incorporation of [14C]adenine (DNA, RNA) and [14C]valine (protein) into the TCA-insoluble fraction of both Ehrlich ascites carcinoma (EAC) and Vero cells. The toxins also interfered with energy-yielding processes (endogenous respiration). The dialysate decreased the level of ATP in EAC cells after two hours incubation in vitro.
Insights
Pseudomonas aeruginosa toxins were screened for in vitro activity. These toxins inhibited DNA, RNA, and protein synthesis and interfered with cellular energy production in cancer and Vero cells.
Area of Science:
- Microbiology
- Biochemistry
- Cell Biology
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen known for producing various toxins.
- Understanding the biochemical mechanisms of these toxins is crucial for developing targeted interventions.
Purpose of the Study:
- To screen Pseudomonas aeruginosa toxins for in vitro biological activity.
- To investigate the biochemical mode of action of these toxins on cellular processes.
Main Methods:
- Isolation and purification of toxins from P. aeruginosa culture filtrate using Sephadex G-100 column chromatography.
- Assessing toxin activity via inhibition of [14C]adenine and [14C]valine incorporation into DNA, RNA, and proteins.
- Evaluating the impact of toxins on cellular energy metabolism, including endogenous respiration and ATP levels.
Main Results:
- Dialysate and fractions 3 and 4 of the toxins significantly inhibited the synthesis of DNA, RNA, and proteins in Ehrlich ascites carcinoma (EAC) and Vero cells.
- The toxins disrupted energy-yielding processes, specifically endogenous respiration.
- A notable decrease in ATP levels was observed in EAC cells after 2-hour incubation with the dialysate.
Conclusions:
- P. aeruginosa toxins possess significant in vitro cytotoxic activity by inhibiting essential macromolecular synthesis.
- These toxins interfere with cellular energy production, highlighting their potent biochemical effects.
- The findings provide a basis for further research into the specific molecular targets and therapeutic potential of P. aeruginosa toxins.