中文版本

Opportunity  

Traditional acute toxicity testing, particularly for environmental pollutants like wastewater effluents, relies heavily on live animal models, such as fish and invertebrates, using mortality as the primary endpoint. This conventional approach requires a large number of experimental animals—for instance, approximately 60-80 animals per test—and takes several days to yield results. In 2019 alone, over 2.56 million fish were used for research and testing purposes in Europe, raising significant ethical concerns and substantial costs. Additionally, the process demands large volumes of test samples and effluents (e.g., about 500L of test sample and 1500L of wastewater effluent per test), posing further environmental burdens. While alternative cell-based assays have been developed to reduce animal use, they often suffer from significantly lower sensitivity compared to whole-animal tests, limiting their reliability for accurate acute toxicity assessment. There is a pressing need for a more ethical, efficient, and sensitive method that minimizes animal use, reduces sample volumes, shortens testing time, and maintains or improves predictive accuracy for environmental and chemical safety evaluations.

Technology  

This patent presents an innovative cell-based assay that combines fish cell cultures with fluorescence technology and bioimaging tools to determine the acute toxicity of analytes, such as wastewater effluents. The core method involves exposing a first fish cell culture (e.g., a fin cell line from Siganus fuscescens) to a reference solution with known pollutant concentrations. The cells are then incubated with specific fluorescent probes targeting subcellular components or processes, such as lysosomes, mitochondria, EROD activity, ROS production, Ca²⁺ influx, and GSH formation. Key fluorescence parameters (e.g., lysosome count, mitochondrial size, lysosomal pH) are obtained from the stained cells using confocal microscopy or a fluorescence plate reader. A critical innovation is the establishment of a first linear regression model that correlates these fluorescence parameters with the survival rates of animal models (e.g., amphipods, barnacle larvae, shrimp) exposed to the same reference solutions. This calibration allows the model to predict acute toxicity. For an unknown analyte, a second fish cell culture is exposed to it, and its fluorescence parameters are compared against the model’s reference values (e.g., at 90% or 50% survival rates) to determine toxicity. The method reduces testing time to as little as 12–24 hours, requires only about 10 mL of exposure medium, and eliminates the need for large-scale animal testing while maintaining high sensitivity through subcellular indicators.

Advantages  

• Reduces ethical concerns by minimizing or replacing the use of live animals in acute toxicity testing.
• Significantly decreases testing time from days to 12–24 hours, enabling faster results.
• Requires minimal sample volumes (e.g., ~10 mL), reducing environmental waste and handling costs.
  
• Enhances sensitivity through subcellular fluorescence parameters that respond sensitively to pollutants.
  
• Provides a linear regression model that correlates cell-based data with animal survival, improving predictive accuracy.
  
• Offers flexibility with multiple fluorescence probes and parameters for comprehensive toxicity assessment.
  
• Can be performed using standard laboratory equipment like confocal microscopes or fluorescence plate readers.
  
• Potential for application beyond wastewater to other analytes like pharmaceuticals, cosmetics, and additives.
  
  

Applications  

• Environmental monitoring and assessment of wastewater effluents from treatment plants.
  
• Toxicity screening of industrial discharges, chemicals, and pollutants in aquatic systems.
  
• Regulatory compliance testing for water quality and safety standards.
  
• Pharmaceutical and cosmetic industry for preliminary toxicity evaluation of products.
  
• Research and development in ecotoxicology and cellular stress response studies.
  
• Educational and training tools for laboratories focusing on alternative testing methods.
  
• Integration into automated high-throughput screening systems for large-scale toxicity testing.