Dose–response functions were determined in adult and preweanling
male rats for four OPs for which there were no publically available
data regarding age-related sensitivity, and to test the accuracy of predictions from our in vitro assay (Moser and Padilla, 2011). Based on
brain ChE inhibition and acute toxicity (lethality), mevinphos was
clearly more toxic, up to 4-fold, to the young rat. On the other hand,
monocrotophos, dicrotophos, and phosphamidon were somewhat
more toxic in the pups, but the magnitude of the differences was
lower, about 2-fold or less. In general, these findings agree with the
limited information on metabolism and detoxification of these OPs.
The current results underscore other findings that age-related
differences in sensitivity are chemical-specific.
Dose–response functions were determined in adult and preweanlingmale rats for four OPs for which there were no publically availabledata regarding age-related sensitivity, and to test the accuracy of predictions from our in vitro assay (Moser and Padilla, 2011). Based onbrain ChE inhibition and acute toxicity (lethality), mevinphos wasclearly more toxic, up to 4-fold, to the young rat. On the other hand,monocrotophos, dicrotophos, and phosphamidon were somewhatmore toxic in the pups, but the magnitude of the differences waslower, about 2-fold or less. In general, these findings agree with thelimited information on metabolism and detoxification of these OPs.The current results underscore other findings that age-relateddifferences in sensitivity are chemical-specific.
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