HDAC6 promotes sepsis development by impairing PHB1-mediated mitochondrial respiratory chain function

Area of Science:

• Biochemistry
• Molecular Biology
• Pathophysiology

Background:

• Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection.
• Mitochondrial dysfunction and oxidative stress are key contributors to sepsis pathogenesis.
• Histone deacetylase 6 (HDAC6) is implicated in cellular stress responses.

Purpose of the Study:

• To investigate the role of HDAC6 in regulating mitochondrial function during sepsis.
• To determine the impact of HDAC6 on the development and progression of sepsis.
• To explore HDAC6 as a potential therapeutic target for sepsis.

Main Methods:

• Quantitative reverse-transcription PCR and western blotting were used to measure HDAC6 and prohibitin 1 (PHB1) expression in human samples and a rat sepsis model.
• Sepsis was induced in rats using cecal ligation and puncture (CLP).
• Mitochondrial function, sepsis markers, and oxidative injury were assessed.

Main Results:

• HDAC6 was found to downregulate PHB1 expression and function in the context of sepsis.
• Inhibition of HDAC6 attenuated sepsis severity, mitochondrial dysfunction, and oxidant production in rats.
• HDAC6 activity led to increased oxidative stress and multi-organ injury.

Conclusions:

• HDAC6 plays a critical role in promoting sepsis by inhibiting PHB1 and disrupting mitochondrial respiratory chain function.
• Targeting HDAC6 offers a potential therapeutic strategy to mitigate sepsis-induced oxidative damage and improve outcomes.