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DNA repair Ku proteins in gastric cancer cells and pancreatic acinar cells

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Summary.

The DNA repair protein Ku acts as a heterodimer of Ku70 and Ku80 that binds to the DNA ends, nicks, or single-to-double-strand transition. It has a crucial role for DNA double-strand-break repair. Either Ku70 or Ku80 itself may have a unique function that is independent of the other Ku subunit. In this review, the role of Ku on cell proliferation and apoptosis will be discussed. Ku acts as a regulator of transcription by interacting with the recombination signal binding protein Jκ and the NF-κB p50 homodimer to up-regulate p50 expression, which may regulate the proliferation of gastric cancer cells. Both Ku70 and Ku80 expressions are mediated by constitutively activated NF-κB and constitutively expressed cyclooxygenase-2 in gastric cancer cells, which may be related to gastric cell proliferation and carcinogenesis. In addition, nuclear loss of Ku may underlie the mechanism of apoptosis in pancreatic acinar cells after oxidative stress.

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  1. Department of Food and Nutrition, Brain Korea 21 Project, College of Human Ecology and Biomolecule Secretion Research Center, Institute of Gastroenterology, College of Medicine, Yonsei University, Seoul, Korea

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Author’s address: Hyeyoung Kim, PhD, Department of Food and Nutrition, Yonsei University College of Human Ecology, Seoul 120-749, Korea

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Kim, H. DNA repair Ku proteins in gastric cancer cells and pancreatic acinar cells. Amino Acids 34, 195–202 (2008). https://doi.org/10.1007/s00726-006-0411-1

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