# Oxidative Stress-Induced DNA Damage Response Pathways in Aortic Disease: Implications for Inflammation and Vascular Degeneration

## TL;DR

This paper reviews how DNA damage from oxidative stress contributes to aortic diseases by triggering inflammation and vascular degeneration.

## Contribution

The paper provides a comprehensive review of molecular mechanisms linking oxidative stress, DNA damage response, and aortic pathology.

## Key findings

- Oxidative DNA lesions activate DDR pathways in vascular cells, influencing cell fate and inflammation.
- DDR regulators like ATM, ATR, and p53 connect oxidative stress to vascular degeneration and inflammation.
- Phenotypic switching of smooth muscle cells and endothelial dysfunction are driven by DDR activation.

## Abstract

Aortic diseases, including thoracic and abdominal aneurysms as well as aortic dissections, represent life-threatening vascular disorders characterized by progressive wall degeneration and inflammation. Increasing evidence indicates that oxidative stress is a central driver of aortic pathology through the induction of DNA damage in vascular smooth muscle cells and endothelial cells. Oxidative DNA lesions activate the DNA damage response (DDR), a highly coordinated network of damage sensors, signaling kinases, and repair effectors that determines cell fate decisions such as DNA repair, apoptosis, or cellular senescence. In aortic tissue, persistent or dysregulated DDR signaling contributes to chronic inflammation, extracellular matrix degradation, and loss of vascular integrity. Key molecular regulators, including base excision repair enzymes OGG1 and APE1, as well as DDR mediators such as ATM, ATR, p53, PARP, and NOTCH1, integrate oxidative stress signals with pro-inflammatory and pro-degenerative pathways. Aberrant activation of these mechanisms promotes vascular smooth muscle cell VSMC phenotypic switching from contractile to synthetic phenotype, endothelial dysfunction, and senescence-associated secretory responses, thereby accelerating aortic wall weakening and aneurysm progression. This review highlights the mechanistic links between oxidative stress-induced DNA damage, DDR pathway activation, and vascular remodeling in aortopathies. A deeper understanding of these molecular interactions may uncover novel biomarkers and therapeutic targets aimed at limiting inflammation, preserving genomic stability, and preventing catastrophic aortic events. This work represents a narrative review and therefore has inherent limitations in terms of systematic literature search and selection.