Hepatocytes, rather than leukocytes reverse DNA damage in vivo induced by whole body y-irradiation of mice, as shown by the alkaline comet assay
| Autor: | Katherine Marcelain, J. Pincheira, Consuelo de la Torre, Pilar Carrera |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Cell type
DNA repair DNA damage leukocytes Cell Endogeny Biology Ionizing radiations General Biochemistry Genetics and Molecular Biology Ionizing radiation chemistry.chemical_compound In vivo Leukocytes medicine in vivo DNA repair lcsh:QH301-705.5 Alkaline comet assay General Medicine Molecular biology medicine.anatomical_structure chemistry lcsh:Biology (General) Hepatocytes alkaline comet assay hepatocytes General Agricultural and Biological Sciences ionizing radiation In vivo DNA repair DNA |
| Zdroj: | Biological Research, Vol 41, Iss 2, Pp 217-225 (2008) Digital.CSIC. Repositorio Institucional del CSIC instname Biological Research v.41 n.2 2008 SciELO Chile CONICYT Chile instacron:CONICYT Biological Research, Volume: 41, Issue: 2, Pages: 217-225, Published: 2008 |
| ISSN: | 0717-6287 0716-9760 |
| Popis: | 10p.-3 fig. DNA damage repair was assessed in quiescent (G0) leukocytes and in hepatocytes of mice, after 1 and 2 hours recovery from a single whole body γ-irradiation with 0.5, 1 or 2 Gy. Evaluation of single-strand breaks (SSB) and alkali-labile sites together were carried out by a single-cell electrophoresis at pH>13.0 (alkaline comet assay). In non-irradiated (control) mice, the constitutive, endogenous DNA damage (basal) was around 1.5 times higher in leukocytes than in hepatocytes. Irradiation immediately increased SSB frequency in both cell types, in a dose-dependent manner. Two sequential phases took place during the in vivo repair of the radioinduced DNA lesions. The earliest one, present in both hepatocytes and leukocytes, further increased the SSB frequency, making evident the processing of some primary lesions in DNA bases into the SSB repair intermediates. In a second phase, SSB frequency decreased because of their removal. In hepatocytes, such a frequency regressed to the constitutive basal level after 2 hours recovery from either 0.5 or1 Gy. On the other hand, the SSB repair phase was specifically abrogated in leukocytes, at the doses and recovery times analyzed. Thus, the efficiency of in vivo repair of radio-induced DNA damage in dormant cells (lymphocytes) is quite different from that in hepatocytes whose low proliferation activity accounts only for cell renewal. This work has been partially supported by the Universidad de Chile-CSIC Agreement (Project 99CLO09), and the Mecesup Postgrado UCH (Project 9903) and also by the Dirección General de Investigación, Ministerio de Educación y Ciencia, Spain (Project BFU2004-03071) |
| Databáze: | OpenAIRE |
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