Mitochondrial ROS-Modulated mtDNA: A Potential Target for Cardiac Aging

Area of Science:

• Cardiology
• Mitochondrial Biology
• Aging Research

Background:

• Mitochondrial DNA (mtDNA) damage is increasingly linked to cardiovascular diseases (CVDs).
• Cardiac aging is a significant factor in CVD development, with accumulating evidence connecting it to mtDNA damage, mutations, and reduced copy numbers.
• Mitochondrial reactive oxygen species (mtROS) are implicated in mtDNA damage.

Purpose of the Study:

• To review the cellular and molecular mechanisms underlying cardiac aging.
• To explore the role of mitochondrial dysfunction, oxidative stress, and mtDNA damage in cardiac aging.
• To discuss potential therapeutic targets for preventing cardiac aging by addressing mtDNA damage.

Main Methods:

• Literature review of cellular and molecular mechanisms of cardiac aging.
• Analysis of the impact of mitochondrial biogenesis and oxidative stress on mtDNA.
• Discussion of key pathways and proteins involved in mtDNA damage during cardiac aging.

Main Results:

• Cardiac aging involves mechanisms such as autophagy, chronic inflammation, mtROS production, and mtDNA damage.
• Mitochondrial biogenesis and oxidative stress significantly affect mtDNA integrity.
• Nucleoid-associated proteins (Pol γ), nuclear respiratory factors (NRF1, NRF2), the cGAS-STING pathway, and mitochondrial biogenesis pathways are crucial in mtDNA damage development during cardiac aging.

Conclusions:

• Mitochondrial dysfunction and mtDNA damage are central to cardiac aging and cardiovascular disease.
• Targeting mtDNA repair mechanisms presents a potential clinical strategy for mitigating cardiac aging.