RGD Reference Report - Hypertonic treatment inhibits radiation-induced nuclear translocation of the Ku proteins G22p1 (Ku70) and Xrcc5 (Ku80) in rat fibroblasts. - Rat Genome Database

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Hypertonic treatment inhibits radiation-induced nuclear translocation of the Ku proteins G22p1 (Ku70) and Xrcc5 (Ku80) in rat fibroblasts.

Authors: Endoh, D  Okui, T  Kon, Y  Hayashi, M 
Citation: Endoh D, etal., Radiat Res. 2001 Feb;155(2):320-7.
RGD ID: 2317102
Pubmed: PMID:11175667   (View Abstract at PubMed)

The effects of X irradiation and hypertonic treatment with 0.5 M NaCl on the subcellular localization of the Ku proteins G22p1 (also known as Ku70) and Xrcc5 (also known as Ku80) in rat fibroblasts with normal radiosensitivity were examined using confocal laser microscopy and immunoblotting. Although these proteins were observed mainly in the nuclei of human fibroblasts, approximately 80% of the intensities of immunofluorescence from both G22p1 and Xrcc5 was observed in the cytoplasm of rat fibroblasts. When the rat cells were X-irradiated with 4 Gy, the intensities of the fluorescence derived from G22p1 and Xrcc5 in the nuclei increased from 20% to 50% of the total cellular fluorescence intensity at 20 min postirradiation. No significant differences were observed between the total intensities of the cellular fluorescence from the proteins in unirradiated and irradiated rat fibroblasts. The results showed that the proteins were translocated from the cytoplasm to the nucleus in the rat cells after X irradiation. The nuclear translocation of the proteins from the cytoplasm was inhibited by hypertonic treatment of the cells with 0.5 M NaCl for 20 min, which inhibits the fast repair process of potentially lethal damage (PLD). When the rat cells were treated with 0.5 M NaCl immediately after X irradiation, the repair of DNA DSBs was inhibited. The surviving fraction was approximately 60% of that of irradiated cells that were not treated with 0.5 M NaCl. The surviving fraction increased with incubation time in the growth medium before treatment with NaCl. The proportions of the intensities of fluorescence from G22p1 in the nuclei of X-irradiated cells also increased from 20% to 50% with increasing interval between X irradiation and treatment with NaCl. These results suggest that nuclear translocation of G22p1 and Xrcc5 is important for the fast repair process of PLD in rat cells.

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
cellular hyperosmotic salinity response  IDA 2317102; 2317102 RGD 
cellular response to X-ray  IDA 2317102 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Xrcc5  (X-ray repair cross complementing 5)
Xrcc6  (X-ray repair cross complementing 6)


Additional Information