Effects of ibuprofen on the viability and proliferation of rainbow trout liver cell lines and potential problems and interactions in effects assessment.
Under some conditions ibuprofen was either cytotoxic or cytostatic to rainbow trout cell lines: RTL-W1 (liver) and RTH-149 (hepatoma). Ibuprofen at up to 15 microg/mL was not cytotoxic, regardless of dosing protocols, exposure conditions, viability endpoints, or cell lines. Responses to higher ibuprofen concentrations depended on the test methodology. No cytotoxicity was seen when stock ibuprofen solutions had been prepared in ethanol. For stock solutions in dimethylsulfoxide (DMSO), ibuprofen from 50 to 1500 microg/mL elicited little cytotoxicity in cultures in which the final DMSO concentration was 0.05% (v/v), but was consistently cytotoxic after 24 h for cultures with 0.5% DMSO (v/v). Cytotoxicity was evaluated with alamar Blue (AB) and carboxyfluoroscein diacetate acetoxymethyl ester (CFDA-AM) as measures respectively of metabolic activity and membrane integrity. Effective concentrations (EC50s) for ibuprofen with AB and CFDA-AM depended on whether the stock solution was dosed directly into a culture well or mixed in medium prior to being added to a well. For indirect dosing, ibuprofen was more cytotoxic in medium without fetal bovine serum (FBS), whereas for direct dosing ibuprofen was equally cytotoxic in medium with or without FBS. As judged by AB and CFDA-AM EC50s, dosing ibuprofen was directly 10 to 30 times more cytotoxic. In FBS-containing cultures, which was dosed with increasing ibuprofen and DMSO at 0.05% (v/v), cell proliferation was impaired at 50 and 150 microg/mL ibuprofen. Lipopolysaccharide (LPS) at 50 microg/mL had little influence on these cytotoxic and cytostatic effects of ibuprofen in medium with FBS.
Environmental Chemistry Department, IIQAB-CSIC, Barcelona, Spain.
Sabine
S
Schnell
Atsushi
A
Kawano
Cinta
C
Porte
Lucy E J
LE
Lee
Niels C
NC
Bols
D000818:Animals; D002460:Cell Line; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D022781:Hepatocytes / Q000166:cytology* / Q000187:drug effects*; D007052:Ibuprofen / Q000633:toxicity*; D007220:Industrial Waste; D008070:Lipopolysaccharides / Q000633:toxicity; D017686:Oncorhynchus mykiss / Q000502:physiology*; D044967:Serum / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D007220:Industrial Waste; D008070:Lipopolysaccharides; D014874:Water Pollutants, Chemical; D007052:Ibuprofen