Gibhardt, Christine S. and Roth, Bastian and Schroeder, Indra and Fuck, Sebastian and Becker, Patrick and Jakob, Burkhard and Fournier, Claudia and Moroni, Anna and Thiel, Gerhard (2015):
X-ray irradiation activates K(+) channels via H2O2 signaling.
In: Scientific reports, 5, p. 13861. ISSN 2045-2322,
[Article]
Abstract
Ionizing radiation is a universal tool in tumor therapy but may also cause secondary cancers or cell invasiveness. These negative side effects could be causally related to the human-intermediate-conductance Ca(2+)-activated-K(+)-channel (hIK), which is activated by X-ray irradiation and affects cell proliferation and migration. To analyze the signaling cascade downstream of ionizing radiation we use genetically encoded reporters for H2O2 (HyPer) and for the dominant redox-buffer glutathione (Grx1-roGFP2) to monitor with high spatial and temporal resolution, radiation-triggered excursions of H2O2 in A549 and HEK293 cells. The data show that challenging cells with ≥1 Gy X-rays or with UV-A laser micro-irradiation causes a rapid rise of H2O2 in the nucleus and in the cytosol. This rise, which is determined by the rate of H2O2 production and glutathione-buffering, is sufficient for triggering a signaling cascade that involves an elevation of cytosolic Ca(2+) and eventually an activation of hIK channels.
| Item Type: | Article |
|---|---|
| Erschienen: | 2015 |
| Creators: | Gibhardt, Christine S. and Roth, Bastian and Schroeder, Indra and Fuck, Sebastian and Becker, Patrick and Jakob, Burkhard and Fournier, Claudia and Moroni, Anna and Thiel, Gerhard |
| Title: | X-ray irradiation activates K(+) channels via H2O2 signaling. |
| Language: | English |
| Abstract: | Ionizing radiation is a universal tool in tumor therapy but may also cause secondary cancers or cell invasiveness. These negative side effects could be causally related to the human-intermediate-conductance Ca(2+)-activated-K(+)-channel (hIK), which is activated by X-ray irradiation and affects cell proliferation and migration. To analyze the signaling cascade downstream of ionizing radiation we use genetically encoded reporters for H2O2 (HyPer) and for the dominant redox-buffer glutathione (Grx1-roGFP2) to monitor with high spatial and temporal resolution, radiation-triggered excursions of H2O2 in A549 and HEK293 cells. The data show that challenging cells with ≥1 Gy X-rays or with UV-A laser micro-irradiation causes a rapid rise of H2O2 in the nucleus and in the cytosol. This rise, which is determined by the rate of H2O2 production and glutathione-buffering, is sufficient for triggering a signaling cascade that involves an elevation of cytosolic Ca(2+) and eventually an activation of hIK channels. |
| Journal or Publication Title: | Scientific reports |
| Journal volume: | 5 |
| Divisions: | 10 Department of Biology 10 Department of Biology > Plant Membrane Biophysics |
| Date Deposited: | 16 Sep 2015 11:33 |
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