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Updated: Mar 8, 2026
Anti-Nuclear Antibody Screening Using HEp-2 Cells
Published on: June 23, 2014
Preferential recognition of auto-antibodies against 4-hydroxynonenal modified DNA in the cancer patients
Mohammad Faisal1, Uzma Shahab2, Abdulrahman A Alatar1
1Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia.
Background:
The structural perturbations in DNA molecule may be caused by a break in a strand, a missing base from the backbone, or a chemically changed base. These alterations in DNA that occurs naturally can result from metabolic or hydrolytic processes. DNA damage plays a major role in the mutagenesis, carcinogenesis, aging and various other patho-physiological conditions. DNA damage can be induced through hydrolysis, exposure to reactive oxygen species (ROS) and other reactive carbonyl metabolites including 4-hydroxynonenal (HNE). 4-HNE is an important lipid peroxidation product which has been implicated in the mutagenesis and carcinogenesis processes.
Methods:
The present study examines to probe the presence of auto-antibodies against 4-hydroxynonenal damaged DNA (HNE-DNA) in various cancer subjects. In this study, the purified calf thymus DNA was damaged by the action of 4-HNE. The DNA was incubated with 4-HNE for 24 h at 37°C temperature. The binding characteristics of cancer auto-antibodies were assessed by direct binding and competitive inhibition ELISA.
Results:
DNA modifications produced hyperchromicity in UV spectrum and decreased fluorescence intensity. Cancer sera exhibited enhanced binding with the 4-HNE modified calf thymus DNA as compared to its native conformer. The 4-HNE modified DNA presents unique epitopes which may be one of the factors for the auto-antibody induction in cancer patients.
Conclusion:
The HNE modified DNA presents unique epitopes which may be one of the factors for the autoantibody induction in cancer patients.
Insights
Cancer patients show auto-antibodies against 4-hydroxynonenal (HNE)-damaged DNA. This HNE-modified DNA has unique epitopes that may trigger autoantibody production in cancer development.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunology
Background:
- DNA damage, including strand breaks or base alterations, arises from metabolic processes and external factors.
- Reactive oxygen species (ROS) and reactive carbonyls like 4-hydroxynonenal (HNE) induce DNA damage.
- HNE, a lipid peroxidation product, is linked to mutagenesis and carcinogenesis.
Purpose of the Study:
- To investigate the presence of autoantibodies against 4-hydroxynonenal-damaged DNA (HNE-DNA) in cancer patients.
- To assess the binding characteristics of these autoantibodies to HNE-modified DNA.
Main Methods:
- Calf thymus DNA was chemically modified using 4-hydroxynonenal (HNE).
- Direct binding and competitive inhibition ELISA were employed to evaluate antibody binding.
- Cancer patient sera were analyzed for autoantibody reactivity against native and HNE-modified DNA.
Main Results:
- HNE modification altered DNA's spectral properties, causing hyperchromicity and reduced fluorescence.
- Sera from cancer patients demonstrated significantly higher binding to HNE-damaged DNA compared to native DNA.
- The study identified unique epitopes on HNE-modified DNA that elicit an autoantibody response.
Conclusions:
- HNE-modified DNA possesses distinct epitopes that can induce autoantibody formation in cancer patients.
- These autoantibodies may serve as potential biomarkers for cancer detection or progression.
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