Abstract
The involvement of thioredoxin/thioredoxin reductase system has been investigated in cerebellar granule cells (CGCs), a cellular system in which neurons are induced in apoptosis by the physiological stimulus of lowering extracellular potassium. Clarifying the sequence of events that occur during apoptosis is a critical issue as it can lead to the identification of those key events that, if blocked, can slow down or reverse the death process. The results reported in this work show that TrxR is involved in the early phase of CGC apoptosis with an increase in activity that coincides with the increased expression of the TrxR1 isoform and guarantees the maintenance of adequate level of Trx in its reduced, active form. However, in late apoptosis, when about 50 % of cells are dead, partial proteolysis of TrxR1 by calpain occurs and the reduction of TrxR1 mRNA, together with the overall decrease in TrxR activity, contribute to increase the levels of the oxidized form of Trx. When the reduced form of Trx is externally added to apoptotic cultures, a significant reduction in cell death is achieved confirming that a well-functioning thioredoxin/thioredoxin reductase system is required for survival of CGCs.
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Acknowledgments
This research was supported by: Project FIRB-MERIT - RBNE08HWLZ_012 to M. N. G.
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The authors declare that they have no conflict of interest.
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Bobba, A., Casalino, E., Petragallo, V.A. et al. Thioredoxin/thioredoxin reductase system involvement in cerebellar granule cell apoptosis. Apoptosis 19, 1497–1508 (2014). https://doi.org/10.1007/s10495-014-1023-y
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DOI: https://doi.org/10.1007/s10495-014-1023-y