Abstract
Background
We examined whether cigarette smoking affects the degrees of oxidative damage (8-hydroxyl-2′-deoxyguanosine [8-OHdG]) on mitochondrial DNA (mtDNA), whether the degree of 8-OHdG accumulation on mtDNA is related to the increased total mtDNA copy number, and whether human 8-oxoguanine DNA glycosylase 1 (hOGG1) Ser326Cys polymorphisms affect the degrees of 8-OHdG accumulation on mtDNA in thoracic esophageal squamous cell carcinoma (TESCC).
Methods
DNA extracted from microdissected tissues of paired noncancerous esophageal muscles, noncancerous esophageal mucosa, and cancerous TESCC nests (n = 74) along with metastatic lymph nodes (n = 38) of 74 TESCC patients was analyzed. Both the mtDNA copy number and mtDNA integrity were analyzed by quantitative real-time polymerase chain reaction (PCR). The hOGG1 Ser326Cys polymorphisms were identified by restriction fragment length polymorphism PCR and PCR-based direct sequencing.
Results
Among noncancerous esophageal mucosa, cancerous TESCC nests, and metastatic lymph nodes, the mtDNA integrity decreased (95.2 to 47.9 to 18.6 %; P < 0.001) and the mtDNA copy number disproportionally increased (0.163 to 0.204 to 0.207; P = 0.026). In TESCC, higher indexes of cigarette smoking (0, 0–20, 20–40, and >40 pack-years) were related to an advanced pathologic N category (P = 0.038), elevated mtDNA copy number (P = 0.013), higher mtDNA copy ratio (P = 0.028), and increased mtDNA integrity (P = 0.069). The TESCC mtDNA integrity in patients with Ser/Ser, Ser/Cys, and Cys/Cys hOGG1 variants decreased stepwise from 65.2 to 52.1 to 41.3 % (P = 0.051).
Conclusions
Elevated 8-OHdG accumulations on mtDNA in TESCC were observed. Such accumulations were associated with a compensatory increase in total mtDNA copy number, indexes of cigarette smoking, and hOGG1 Ser326Cys polymorphisms.
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Acknowledgment
This work was supported by Grants from the Department of Health, Executive Yuan, Taiwan (No. 97-04, 98-08, and 99-05) and National Science Council, Taiwan (NSC 100-2314-B-192-001).
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S.-C. Chang and Y.-H. Wei contributed equally to this work.
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Lin, CS., Wang, LS., Chou, TY. et al. Cigarette Smoking and hOGG1 Ser326Cys Polymorphism are Associated with 8-OHdG Accumulation on Mitochondrial DNA in Thoracic Esophageal Squamous Cell Carcinoma. Ann Surg Oncol 20 (Suppl 3), 379–388 (2013). https://doi.org/10.1245/s10434-012-2576-z
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DOI: https://doi.org/10.1245/s10434-012-2576-z