Modulation of X-ray-induced damage recognition and repair in ageing human peripheral blood mononuclear cells by an interleukin-6-type cytokine

Daniela Frasca, Paola Barattini, Grazia Tocchi, Francesco Guidi, Salvatore Scarpaci, Luisa Guidi, Carlo Bartoloni, Andrea Errani, Mario Costanzo, Gino Doria

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We have investigated the effects of an interleukin (IL)-6-type cytokine on the DNA-binding activity of ku and on unscheduled DNA repair in X-ray-treated peripheral blood mononuclear cells (PBMC) from human subjects of different ages. The cytokine used, called K-7/D-6, is an IL-6 variant with increased in vivo and in vitro biological activity compared to the wild type molecule. Ku is the DNA-binding component of the DNA-dependent protein kinase (DNA-PK). It binds the ends of various types of DNA discontinuity and is involved in the repair of DNA breaks caused by V(D)J recombination, isotype switching, physiological oxidation reactions, ionizing radiation and some chemotherapeutic drugs. The ku-dependent repair process, called non-homologous end joining, is the main DNA double strand break repair mechanism in irradiated mammalian cells. Results show that K-7/D-6 significantly increases DNA-binding activity of ku in irradiated PBMC from young but not from elderly subjects. However, K-7/D-6 is able to induce unscheduled DNA repair in irradiated PBMC from both young and elderly subjects. These effects of K-7/D-6 are relevant to the mechanisms of the cellular response to DNA damage. © 2000 Elsevier Science Ireland Ltd.
Original languageEnglish
Pages (from-to)5 - 19
Number of pages15
JournalMechanisms of Ageing and Development
Issue number1-3
Publication statusPublished - 20 Jan 2001
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Ageing
  • Developmental Biology

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