Homocysteine and Mitochondria in Cardiovascular and Cerebrovascular Systems

Area of Science:

• Biochemistry
• Cell Biology
• Pathophysiology

Background:

• Elevated plasma homocysteine (hyperhomocysteinemia, HHcy) is associated with cardiovascular and neurodegenerative diseases.
• Mitochondrial dysfunction is increasingly recognized as a key factor in the pathophysiology of these HHcy-linked disorders.

Purpose of the Study:

• To review the current understanding of how hyperhomocysteinemia affects mitochondrial homeostasis.
• To explore the complex interactions between homocysteine and mitochondria, focusing on reactive oxygen species (ROS) as mediators.

Main Methods:

• Literature review focusing on recent studies examining HHcy's impact on mitochondrial energy metabolism, apoptosis, and dynamics.
• Analysis of mechanisms underlying HHcy-associated oxidative stress, including ROS generation and antioxidant defense alterations.
• Discussion of emerging evidence on potential beneficial effects of HHcy.

Main Results:

• HHcy significantly impacts mitochondrial homeostasis, affecting energy production, apoptotic pathways, and dynamics.
• Reactive oxygen species (ROS) are implicated as mediators of HHcy's detrimental effects on mitochondria.
• Alterations in gene expression and protein modifications contribute to HHcy-induced oxidative stress and compromised antioxidant defenses.

Conclusions:

• The relationship between HHcy and mitochondrial function is complex, involving oxidative stress and altered antioxidant systems.
• While HHcy is linked to disease, some findings suggest potential beneficial roles in mitochondrial ROS homeostasis.
• Further understanding of these mechanisms is crucial for developing targeted therapies for HHcy-associated conditions.