Permanent fish cell cultures as important tools in ecotoxicology

Area of Science:

• Environmental toxicology
• In vitro toxicology
• Cell culture applications

Background:

• Permanent fish cell lines, including hepatoma (PLHC-1) and gonadal (RTG-2) cells, are established models for chemical toxicity assessment.
• Physico-chemical properties, such as lipophilicity (log Dow), significantly influence observed cytotoxicity.
• Previous studies show correlations between in vitro and in vivo acute toxicity in fish and zooplankton.

Purpose of the Study:

• To evaluate the utility of permanent fish cell lines for acute toxicity assessment of environmental chemicals.
• To establish a correlation between in vitro cytotoxicity and in vivo acute toxicity.
• To develop a transfection system for estrogenicity determination using fish cell lines.

Main Methods:

• Utilized permanent fish cell lines (PLHC-1, RTG-2) for cytotoxicity assays.
• Assessed acute toxicity of various chemicals including organotins, substituted phenols, and pharmaceuticals.
• Correlated in vitro cytotoxicity data with existing in vivo toxicity data for fish and Daphnia magna.
• Developed and employed a transfection system based on PLHC-1 cells for estrogenicity testing.

Main Results:

• Cytotoxicity observed in fish cell lines significantly correlated with compound lipophilicity (log Dow).
• A significant correlation was found between in vitro and in vivo acute toxicity for organotins and substituted phenols in fish.
• Similar correlations were observed for pharmaceuticals tested against zooplankton (Daphnia magna).
• A functional transfection system for estrogenicity determination was successfully developed using PLHC-1 cells.

Conclusions:

• Permanent fish cell lines provide a reliable in vitro method for screening and assessing the acute toxicity of environmental chemicals.
• Fish cell line data show strong predictive value for in vivo toxicity in aquatic organisms.
• These cell lines are suitable for chemical safety assessments within regulatory frameworks like REACH.
• The developed transfection system offers a valuable tool for detecting estrogenic activity in chemicals and environmental samples.