Low amounts of the DNA repair XPA protein are sufficient to recover UV-resistance

被引:31
作者
Muotri, AR
Marchetto, MCN
Suzuki, MF
Okazaki, K
Lotfi, CFP
Brumatti, G
Amarante-Mendes, GP
Menck, CFM
机构
[1] Univ Sao Paulo, Inst Ciencias Biomed, Dept Microbiol, BR-05508900 Sao Paulo, Brazil
[2] CNEN SP, IPEN, Sao Paulo, Brazil
[3] Univ Sao Paulo, Inst Ciencias Biomed, Dept Anat, BR-05508900 Sao Paulo, Brazil
[4] Univ Sao Paulo, Inst Ciencias Biomed, Dept Imunol, BR-05508900 Sao Paulo, Brazil
[5] Inst Milenio, Inst Invest Imunol, Sao Paulo, Brazil
基金
巴西圣保罗研究基金会;
关键词
D O I
10.1093/carcin/23.6.1039
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
DNA integrity is threatened by the damaging effects of physical and chemical agents that can affect its function. Nucleotide excision repair (NER) is one of the most known and flexible mechanisms of DNA repair. This mechanism can recognize and remove damages causing DNA double-helix distortion, including the cyclobutane pyrimidine dimers (CPDs) and the pyrimidine-pyrimidone (6-4) photoproducts, promoted by ultraviolet light (UV). The human syndrome xeroderma pigmentosum (XP) is clinically characterized chiefly by the early onset of severe photosensitivity of the exposed regions of the skin, a very high incidence of skin cancers and frequent neurological abnormalities. The xpa gene seems to be involved during UV damage recognition, in both global genome repair (GGR) and transcription-coupled repair (TCR). The modulation of xpa expression may modify the DNA repair rate in the cell genome, providing a valuable contribution to an understanding of the NER process. The controlled expression of the cDNA xpa in XP12RO deficient cells was achieved through the transfection of a muristerone-A inducible vector, pINXA. The INXA15 clone shows good induction of the XPA protein and total complementation of XP12RO cell deficiency. Overexpression of this protein resulted in UV cell survival comparable to normal control human cells. Moreover, low expression of the XPA protein in these cells is sufficient for total complementation in cellular UV sensitivity and DNA repair activity. These data demonstrate that XPA protein concentration is not a limiting factor for DNA repair.
引用
收藏
页码:1039 / 1046
页数:8
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