Urinary 8-hydroxydeoxyguanosine and its analogs as DNA marker of oxidative stress: development of an ELISA and measurement in both bladder and prostate cancers

Clin Chim Acta. 2003 Aug;334(1-2):87-94. doi: 10.1016/s0009-8981(03)00191-8.


Background: 8-hydroxydeoxyguanosine (8-OHdG) is the most frequently detected and studied DNA lesion. Upon DNA repair, 8-OHdG is excreted in the urine. Urinary 8-OHdG is now considered as a biomarker of generalized, cellular oxidative stress and is linked to degenerative diseases including cancer.

Methods: We developed a competitive enzyme-linked immunosorbent assay (ELISA) for urinary 8-OHdG by coating BSA conjugated 8-hydroxyguanine (8-OHG) on a microplate. Urine specimens containing 8-OHdG and monoclonal anti-8-OHdG antibody were incubated together in the microwell. Final quantification of bound anti-8-OHdG antibody was estimated by the addition of HRP-conjugated sheep-anti-mouse antibody.

Results: The concentration range of the calibration curve was 0-60 ng/ml. The sensitivity of the assay was 0.5 ng/ml. The within-day precision and day-to-day precision were <10%. The ELISA correlated well with a commercial kit (r=0.9). Our assay measured not only 8-OHdG but also 8-OHG and 8-hyroxyguanine in urine. Increased urinary concentration of 8-OHdG and its analogs were detected in both patients with bladder cancer (70.5+/-38.2 ng/mg creatinine) and prostate cancer (58.8+/-43.4 ng/mg creatinine) as compared to the healthy control (36.1+/-24.5 ng/mg creatinine).

Conclusion: Our preliminary data suggest that the competitive ELISA for 8-OHdG and its analogs appears to be a simple method for quantifying the extent of oxidative stress and may have potential for identifying cancer risk.

MeSH terms

  • 8-Hydroxy-2'-Deoxyguanosine
  • Adult
  • Biomarkers
  • Calibration
  • Chromatography, Gel
  • DNA / chemistry*
  • Deoxyguanosine / analogs & derivatives*
  • Deoxyguanosine / urine*
  • Enzyme-Linked Immunosorbent Assay
  • Guanosine / analogs & derivatives*
  • Guanosine / metabolism
  • Humans
  • Male
  • Oxidative Stress / physiology*
  • Prostatic Neoplasms / urine*
  • Reagent Kits, Diagnostic
  • Reproducibility of Results
  • Urinary Bladder Neoplasms / urine*


  • Biomarkers
  • Reagent Kits, Diagnostic
  • Guanosine
  • 8-hydroxyguanosine
  • 8-Hydroxy-2'-Deoxyguanosine
  • DNA
  • Deoxyguanosine