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Related Experiment Video

Updated: Jul 9, 2026

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions

Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions

Published on: August 2, 2018

Sequence-specific oxidative base modifications in hypoxia-inducible genes.

Viktor Pastukh¹, Mykhaylo Ruchko, Olena Gorodnya

¹Department of Pharmacology and Center for Lung Biology, University of South Alabama College of Medicine, Mobile, AL 36688, USA.

Free Radical Biology & Medicine

|November 27, 2007

Summary

This summary is machine-generated.

Hypoxia causes specific oxidative DNA modifications in key gene promoter regions within pulmonary arterial endothelial cells (PAECs). These targeted modifications, not genome-wide, are linked to gene activation during hypoxic signaling.

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Area of Science:

Molecular Biology
Cellular Signaling
Genomics

Background:

Hypoxic signaling involves reactive oxygen species (ROS) that can modify DNA.
Previous studies indicated ROS modify nucleotides in the VEGF gene's hypoxic response element (HRE).

Purpose of the Study:

To investigate if hypoxia induces genome-wide oxidative DNA modifications or targets specific gene promoters in PAECs.
To determine the functional relevance of hypoxia-induced oxidative DNA modifications.

Main Methods:

Comet assays were used to assess global DNA damage under normoxic and hypoxic conditions.
A PCR-based method with formamidopyrimidine DNA glycosylase (Fpg) was employed to detect oxidative purine base modifications.
Analysis focused on promoter regions, coding regions, and non-regulated genes.

Main Results:

Comet assays showed no significant global DNA damage difference between normoxic and hypoxic PAECs.
Fpg-sensitive sites, indicating oxidative modifications, were found in HREs of hypoxia-inducible genes (VEGF, HO-1, ET-1) correlating with mRNA accumulation.
No oxidative modifications were detected in non-hypoxia-responsive promoter sequences, coding regions, or downregulated/constitutively expressed genes.

Conclusions:

Hypoxia-mediated oxidative DNA modifications are localized to specific promoter regions of hypoxia-inducible genes.
These targeted oxidative modifications in HREs may play a significant biological role in regulating gene expression during hypoxia.