Oxidative Stress Regulates CDH3 Expression in Lung Cancer Cells via OGG1-Mediated SP1 Binding.

Oxidative stress, resulting from an imbalance between reactive oxygen species (ROS) production and antioxidant defenses, plays a crucial role in tumor development. Tumor cells often experience elevated oxidative stress due to rapid proliferation and unstable metabolism, leading to DNA damage. The enzyme 8-oxoguanine DNA glycosidase (OGG1) is central to repairing oxidative DNA damage, thereby maintaining genomic stability. In addition to its DNA repair function, OGG1 also plays a role in gene expression under oxidative stress. This study examined the expression pattern of cadherin-3 (CDH3), a cell adhesion protein associated with cancer metastasis and poor prognosis, under oxidative stress. Our findings showed that oxidative stress upregulated CDH3 expression, with OGG1 playing a pivotal role. Analysis of the promoter revealed SP1 binding sites, and ChIP-qPCR assays confirmed OGG1's involvement in modulating SP1 binding. These results provided new insights into the regulation of CDH3 under oxidative stress and suggested potential therapeutic strategies targeting CDH3 in cancer treatment.