Interaction of mtROS-Immune-Inflammatory Vicious Cycle Activation in Sepsis-Induced Cardiomyopathy

Area of Science:

• Cardiovascular Biology
• Mitochondrial Medicine
• Immunology

Background:

• Mitochondrial reactive oxygen species (mtROS) are central to mitochondrial energy metabolism disorders and sepsis-induced cardiomyopathy (SICM).
• mtROS production and regulation involve VDAC1, STK3/KEAP1/Nrf2 signaling, and mitochondria-endoplasmic reticulum interactions (DUSP1/PHB2).
• mtROS impact cellular damage via the nitric oxide-lipid metabolic axis and ferroptosis, and exacerbate organ damage in sepsis by modulating the immune microenvironment.

Purpose of the Study:

• To review the interconnected mechanisms of mtROS in SICM.
• To highlight the role of mtROS in linking mitochondrial dysfunction, immune dysregulation, and myocardial injury.
• To identify mtROS regulatory pathways as potential therapeutic targets.

Main Methods:

• Literature review of molecular mechanisms and signaling pathways involved in mtROS production and function.
• Analysis of mtROS interactions with cellular damage pathways (ferroptosis, nitric oxide-lipid metabolism).
• Examination of mtROS role in immune modulation during sepsis and its impact on cardiac function.

Main Results:

• mtROS are critical mediators in SICM pathogenesis, affecting energy metabolism and cellular integrity.
• The STK3/KEAP1/Nrf2 pathway and mitochondria-ER interactions significantly influence mtROS levels and pathological outcomes.
• mtROS drive immune-related organ damage in sepsis through cytokine storms and inflammatory signaling, with the SIRT3-SOD2 axis playing a key regulatory role.
• Cardiac-specific SOD2 overexpression improves heart function by controlling mtROS.

Conclusions:

• mtROS act as a central hub linking mitochondrial dysfunction, immune dysregulation, and myocardial injury in SICM.
• Targeting mtROS and their regulatory pathways presents a promising therapeutic avenue for treating SICM.
• Understanding these complex interactions is crucial for developing effective interventions against sepsis-induced cardiac damage.