Abstract
Studies in rats in vivo and in isolated hepatocytes from the same species and strain of animal in vitro with the hepatotoxicant hydrazine have shown that despite measuring the same parameters in each system, the effects do not always show a quantitative or qualitative correlation. For example depletion of glutathione and ATP occurred in both systems but required a much higher concentration of hydrazine in vitro. The effects on triglyceride levels, citrulline synthesis and taurine levels in vivo were not observed in vitro and the inhibition of urea synthesis and cytotoxicity in vitro were not observed in vivo.
Inhibition of protein synthesis proved to be the marker which showed the best correlation, occurring at a similar hydrazine concentration in vitro and in vivo although not to the same extent.
The situation with other toxicants is variable, in some cases correlation is good, in others modification of conditions in vitro are required.
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Timbrell, J.A., Delaney, J. & Waterfield, C.J. Correlation between in vivo and in vitro toxic effects of foreign compounds. Comparative Haematology International 6, 232–236 (1996). https://doi.org/10.1007/BF00378116
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DOI: https://doi.org/10.1007/BF00378116