Role of thioredoxin-1 in apoptosis induction by alpha-tocopheryl succinate and TNF-related apoptosis-inducing ligand in mesothelioma cells

FEBS Letters
Ruth E Freeman, Jiri Neuzil

Abstract

Malignant mesothelioma (MM) is a fatal type of cancer. We studied the role of the redox-active protein thioredoxin-1 (Trx-1) in apoptosis induced in MM cells and their non-malignant counterparts (Met-5A) by alpha-tocopheryl succinate (alpha-TOS) and TNF-related apoptosis-inducing ligand (TRAIL). MM cells were susceptible to alpha-TOS and less to TRAIL, while Met-5A cells were susceptible to TRAIL and resistant to alpha-TOS. MM cells expressed very low level of the Trx-1 protein, which was high in Met-5A cells, while the level of Trx-1 mRNA was similar in all cell lines. Downregulation of Trx-1 further sensitised Met-5A cells to TRAIL but not to alpha-TOS. Our data suggest that the role of Trx-1 in apoptosis modulation is unrelated to its anti-oxidant properties.

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Jun 8, 2012·Cancer Cell International·Ammad Ahmad FarooqiMuhammad Ismail
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