ELISA/assay

DNA Damage (8-OHdG) ELISA Kit

SKT-120

96 well

DNA Damage (8-OHdG) ELISA Kit

Colorimetric detection of 8-hydroxy-2-deoxy Guanosine

96 well

Cancer Oxidative Stress Cell Signaling Post-translational Modifications Oxidation Cell Signaling Epigenetics and Nuclear Signaling DNA/RNA DNA Damage and Repair

8-OH-dG ELISA Kit, 8OHG ELISA Kit, 80G ELISA Kit, 8 hydroxyguanine ELISA Kit, 8-OHdG ELISA Kit, DNA Damage ELISA Kit

ELISA Kits

Colorimetric Assay

Competitive ELISA (Enzyme-linked Immunosorbent Assay)

Competitive

ELISA Kit for 8-OHdG detection in samples.

1. Prepare standard and samples in the Sample and Standard Diluent. 2. Add 50 µL of prepared standards and samples in triplicate to appropriate wells. 3. Add 50 µL of the diluted antibody preparation to the appropriate wells. 4. Cover plate with Plate Cover and incubate at room temperature (20-25°C) for 1 hour. 5. Wash plate 4 times with 1X Wash Buffer. 6. Add 100 µL of TMB Substrate to each well. 7. Cover plate and develop the plate in the dark at room temperature for 30 minutes. 8. Add 100 µL of Stop Solution to each well. 9. Measure absorbance on a plate reader at 450 nm. 10. Plot the standard curve and calculate sample concentrations.

Intra-Assay Precision: Three samples of known concentration were assayed thirty times on one plate; the intra-assay coefficient of variation of the DNA Damage ELISA has been determined to be <5%. Inter-Assay Precision: Three samples of known concentration were assayed thirty times in three individual assays; the inter-assay coefficient of variation of the DNA Damage ELISA has been determined to be <5%.

Species Independent

Urine Cell Lysates Plasma Sample matrices

39 samples in duplicate

1 hour

0.59 ng/mL

0.94 - 60 ng/mL

Cross-reactivity: 8-Hydroxy-2-deoxy Guanosine (8-OHdG): 100%. 8-Hydroxy Guanosine (8-OHG): 23%. 8-Hydroxy Guanine (8-oxoG): 23%. Guanosine: <0.01%.

8-hydroxy-2-deoxy Guanosine (8-OH-dG) is produced by the oxidative damage of DNA by reactive oxygen and nitrogen species and serves as an established marker of oxidative stress (1-4). Hydroxylation of guanosine occurs in response to both normal metabolic processes and a variety of environmental factors (i.e., anything that increases reactive oxygen and nitrogen species). Increased levels of 8-OH-dG are associated with the aging process as well as with a number of pathological conditions including cancer, diabetes, and hypertension(5-9). In complex samples such as plasma, cell lysates, and tissues, 8-OH-dG can exist as either the free nucleoside or incorporated in DNA. Once the blood enters the kidney, free 8-OH-dG is readily filtered into the urine, while larger DNA fragments remain in the bloodstream. Because of the complexity of plasma samples, urine is a more suitable matrix for the measurement of free 8-OH-dG than plasma. Urinary levels of 8-OH-dG range between 2.7-13 ng/mg creatine, while plasma levels of free 8-OH-dG have been reported to be between 4-21 pg/ml as determined by LC-MS (10-11).

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