Abstract
The present study was designed to demonstrate the loss of ERK dependence on amplified apoptotic signals in arsenic treated rat hepatocytes. Arsenic trioxide treatment (10 μM) exhibited simultaneous activation of caspase 9, caspase 3 and caspase 8. Moreover, expression and secretion of Fas ligand was also prominent. Reduction in nuclear translocation of pERK was directly associated with caspase activation. Treatment with ERK inhibitor further augmented caspase activation. An experiment with Fas receptor blocked cells confirmed self amplification of apoptotic signals via Fas R/caspase 8 interaction.
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