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Tumor Biology |
Department of Biomedicine and Surgery, Division of Cell Biology, University of Linköping, S-581 85 Linköping, Sweden
Thioredoxin (Trx) and Trx reductase (TrxR) are redox-active proteins
that participate in multiple cellular events, including growth
promotion, apoptosis, and cytoprotection. Studies on overexpression of
Trx and TrxR in human cancers have indicated a role of these proteins
in tumor development. In this study, we analyzed the expression of TrxR
in peripheral blood cells, tumor-transformed leukemia, and melanoma
cells and found, in addition to abundant plasma membrane localization,
that TrxR was released from these cells. Secretory cells were observed
at the single cell level using a sensitive enzyme-linked immunospot
assay. The release was inducible, and physiological stimulation of
human monocytes by IFN-
, lipopolysaccharide, and interleukin 1
significantly increased the number of TrxR-secreting cells
(P = 0.004). Secretion of TrxR followed
the classical Golgi pathway, and it was confirmed by metabolic labeling
using [35S]methionine and
[35S]cysteine. TrxR was also detected for the
first time in fresh healthy blood donor plasma
(n = 21; median concentration, 18.0
ng/ml), with biological activity as determined by insulin reduction
assay.
These results highlight the role of extracellular Trx and TrxR during inflammation and tumor progression. Released Trx, with its active site motif containing amino acids Cys-X-X-Cys, was recently shown to have chemoattractant properties beside its previously described antioxidant and cocytokine activities. Regeneration of oxidized Trx requires available TrxR outside the cell, the presence and induction of which is described in this paper for normal and transformed cells.
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