کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5511000 | 1539376 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Inorganic arsenic inhibits the nucleotide excision repair pathway and reduces the expression of XPC
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کلمات کلیدی
PAH6-4 photoproductDDB2XPCBPDEB[a]P - B [a] Pcpd - CPDNER - DOWNxeroderma pigmentosum - pigmentosum xerodermaArsenic - آرسنیکBenzo(a)pyrene - بنزو (a) پیرنهbenzo(a)pyrene diol epoxide - بنزو (الف) پیروئید دیوال اپوکسیnucleotide excision repair - تعمیر مجدد نوکلئوتیدیcyclobutane pyrimidine dimer - دییریر پیریمیدین cyclobutaneLung cancer - سرطان ریهSkin cancer - سرطان پوستUV light - نور فرابنفشPolycyclic aromatic hydrocarbon - هیدروکربن آروماتیک چند حلقه ای
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Chronic exposure to arsenic, most often through contaminated drinking water, has been linked to several types of cancer in humans, including skin and lung cancer. However, the mechanisms underlying its role in causing cancer are not well understood. There is evidence that exposure to arsenic can enhance the carcinogenicity of UV light in inducing skin cancers and may enhance the carcinogenicity of tobacco smoke in inducing lung cancers. The nucleotide excision repair (NER) pathway removes different types of DNA damage including those produced by UV light and components of tobacco smoke. The aim of the present study was to investigate the effect of sodium arsenite on the NER pathway in human lung fibroblasts (IMR-90 cells) and primary mouse keratinocytes. To measure NER, we employed a slot-blot assay to quantify the introduction and removal of UV light-induced 6-4 photoproducts (6-4 PP) and cyclobutane pyrimidine dimers (CPDs). We find a concentration-dependent inhibition of the removal of 6-4 PPs and CPDs in both cell types treated with arsenite. Treatment of both cell types with arsenite resulted in a significant reduction in the abundance of XPC, a protein that is critical for DNA damage recognition in NER. The abundance of RNA expressed from several key NER genes was also significantly reduced by treatment of IMR-90 cells with arsenite. Finally, treatment of IMR-90 cells with MG-132 abrogated the reduction in XPC protein, suggesting an involvement of the proteasome in the reduction of XPC protein produced by treatment of cells with arsenic. The inhibition of NER by arsenic may reflect one mechanism underlying the role of arsenic exposure in enhancing cigarette smoke-induced lung carcinogenesis and UV light-induced skin cancer, and it may provide some insights into the emergence of arsenic trioxide as a chemotherapeutic agent.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: DNA Repair - Volume 52, April 2017, Pages 70-80
Journal: DNA Repair - Volume 52, April 2017, Pages 70-80
نویسندگان
Nathaniel Holcomb, Mamta Goswami, Sung Gu Han, Tim Scott, John D'Orazio, David K. Orren, C. Gary Gairola, Isabel Mellon,