A. Kurimasa et al., Catalytic subunit of DNA-dependent protein kinase: Impact on lymphocyte development and tumorigenesis, P NAS US, 96(4), 1999, pp. 1403-1408
Citations number
32
Categorie Soggetti
Multidisciplinary
Journal title
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
The DNA-dependent protein kinase (DNA-PK) consists of a heterodimer DNA-bin
ding complex, Ku70 and Ku80, and a large catalytic subunit, DNA-PKcs, To ex
amine the role of DNA-PKcs in lymphocyte development, radiation sensitivity
, and tumorigenesis, we disrupted the mouse DNA-PKcs by homologous recombin
ation. DNA-PKcs-null mice exhibit neither growth retardation nor a high fre
quency of T cell lymphoma development, but show severe immunodeficiency and
radiation hypersensitivity. In contrast to the Ku70-/- and Ku80-/- phenoty
pe, DNA-PKcs-null mice are blocked for V(D)J coding but not for signal-end
joint formation. Furthermore, inactivation of DNA-PKcs leads to hyperplasia
and dysplasia of the intestinal mucosa and production of aberrant crypt fo
ci, suggesting a novel role of DNA-PKcs in tumor suppression.