Upregulation of thioredoxin-1 in activated human NK cells confers increased tolerance to oxidative stress
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Abstract
Adoptive transfer of immune cells, such as T lymphocytes and NK cells, has potential to control cancer growth. However, this can be counteracted by immune escape mechanisms within the tumor microenvironment, including those mediated by reactive oxygen species (ROS). Here, we determined the levels of anti-oxidant molecules in NK cells and their capacity to overcome ROS-induced immune suppression. We investigated the effect of H2O2 on resting NK cells, IL-2-activated NK cells and NK cells expanded by coculture with the K562 leukemia cell line genetically modified to express membrane-bound IL-15 and 4-1BB ligand (K562-mb15-41BBL). Expression of anti-oxidant and anti-apoptotic genes was evaluated by expression array, and protein levels of anti-oxidant molecules by Western blot. Activated NK cells, IL-2-activated NK cells and NK cells expanded by K562-mb15-41BBL were significantly more resistant to H2O2-induced cell death than resting NK. Thioredoxin-1 (TXN1) and peroxiredoxin-1 (PRDX1) were also up-regulated in activated NK cells. Moreover, H2O2-induced cell death after IL-2 activation was significantly induced in the presence of an anti-TXN1-neutralising antibody. Collectively, these data document that activated NK cells can resist to H2O2-induced cell death by up-regulation of TXN1.
Keywords
IL-2 NK cells Thioredoxin-1 Hydrogen Peroxide Immune surveillanceAbbreviations
- 7-AAD
7-Aminoactinomycin D
- Akt
Protein kinase B
- ECL
Enhanced chemiluminescence
- Erk
Extracellular signal–regulated kinase
- Expanded NK
NK cells expanded with K562 leukemia cell line genetically modified to express membrane-bound IL-15 and 4-1BB ligand for 7 days
- IL-2 NK
NK cells activated by several doses of IL-2 for 7 days
- K562-mb15-41BBL
K562 leukemia cell line genetically modified to express membrane-bound IL-15 and 4-1BB ligand
- PRDX1
Peroxiredoxin-1
- Resting NK
Resting NK cells
- ROS
Reactive oxygen species
- SOD
Superoxide dismutase
- TXN1
Thioredoxin-1
Notes
Acknowledgements
This work was supported by a Clinician Scientist Award (CSA) and Clinician Scientist-Individual Research Grant (CS-IGR) from the National Medical Research Council of Singapore. We would like to thank Dr. Dario Campana (National University of Singapore, Singapore) for providing us with the K562-mb15-41BBL cell line.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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