Azathioprine and UVA light generate mutagenic oxidative DNA damage.
Azathioprine and UVA light generate mutagenic oxidative DNA damage.
复制标题
硫唑嘌呤和UVA光产生诱变的氧化DNA损伤。
DOI:
10.1126/science.1114233
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发表时间:
2005-09-16
期刊:
影响因子:
--
通讯作者:
Karran P
中科院分区:
文献类型:
--
作者:
O'Donovan P;Perrett CM;Zhang X;Montaner B;Xu YZ;Harwood CA;McGregor JM;Walker SL;Hanaoka F;Karran P
Oxidative stress and mutagenic DNA lesions formed by reactive oxygen species (ROS) are linked to human malignancy. Clinical treatments inducing chronic oxidative stress may therefore carry a risk of therapy-related cancer. We suggest that immunosuppression by azathioprine (Aza) may be one such treatment. Aza causes the accumulation of 6-thioguanine (6-TG) in patients' DNA. Here we demonstrate that biologically relevant doses of ultraviolet A (UVA) generate ROS in cultured cells with 6-TG–substituted DNA and that 6-TG and UVA are synergistically mutagenic. A replication-blocking DNA 6-TG photoproduct, guanine sulfonate, was bypassed by error-prone, Y-family DNA polymerases in vitro. A preliminary analysis revealed that in five of five cases, Aza treatment was associated with a selective UVA photosensitivity. These findings may partly explain the prevalence of skin cancer in long-term survivors of organ transplantation.
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