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[Microbial test combination with Vibrio fischeri as a screening toxicity test]
Silke Schicktanz1, Dietrich Frahne, Wolfgang Honnen
1Eberhard-Karls-Universität D-Tübingen, Lehrstuhl für Ethik in den Biowissenschaften.
ALTEX
|February 15, 2001
Summary
Two microbial toxicity tests using Vibrio fischeri can reduce animal testing. These tests accurately predict chemical toxicity, showing strong correlations with established animal-based methods.
Area of Science:
- Environmental Toxicology
- Microbiology
- In Vitro Testing
Background:
- Reducing animal experiments in product testing is a significant goal.
- Microbial toxicity tests offer potential alternatives to animal-based assays.
Purpose of the Study:
- To investigate two microbial toxicity tests for their efficacy in reducing animal testing.
- To evaluate the combined power of bioluminescence and metabolic inhibition tests as toxicological indicators.
Main Methods:
- Utilized the acute bioluminescence inhibition test and the chronic DMS test with Vibrio fischeri.
- Measured inhibition of bacterial luminescence and microbial metabolism (DMSO to DMS).
- Tested known alcohols and tensides, correlating results with Draize eye irritation and intravenous toxicity tests.
Main Results:
- A strong correlation (rs = 0.943 for eye irritation, rs = 0.958 for intravenous toxicity) was found between microbial test results and animal test data for 15 substances.
- Substances with EC50-values >10000mg/L were classified as non- to mildly toxic.
- Substances with EC50-values <5mg/L were identified as extremely toxic.
- No false positive or false negative results were observed.
Conclusions:
- The combined microbial toxicity tests (bioluminescence and DMS) with Vibrio fischeri serve as a powerful toxicological indicator.
- These in vitro methods show significant potential for reducing animal experiments in product safety assessment.
- The tests are suitable for application as a screening tool or as part of a broader toxicological testing strategy.