Abstract:
:To investigate the in vivo role of caspase-3 in Terminal Transferase metabolism DMSO-treated RPMI-8402, a human pre-T cell line was used. In DMSO treated samples (3)H-dGTP incorporation and TdT phosphorylation occurs after 4 hours of treatment. After 8 hours cells undergo TdT proteolysis in addition to its inactivation. The cleavage of TdT into 32- and 58-KDa proteolytic fragments occurred simultaneously with the activation of Caspase-3, but preceded changes associated with the apoptotic process described after 48 hours of treatment. The Caspase-3 peptide inhibitor V, used as a specific inhibitor, prevented TdT proteolysis prolonging its activity and rescued cells from apoptosis. Our experiments suggest that TdT is a nuclear substrate for Caspase-3, the main apoptotic effector protease in many cell types, and that the cleavage of TdT represents a primary step in a signal cascade leading to pre-T cell apoptosis.
journal_name
Int J Immunopathol Pharmacolauthors
Trubiani O,Guarnieri S,Paganelli R,Di Primio Rdoi
10.1177/039463200201500306keywords:
subject
Has Abstractpub_date
2002-09-01 00:00:00pages
201-208issue
3eissn
0394-6320issn
2058-7384pii
6journal_volume
15pub_type
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