Diabetes Exacerbates Sepsis-Induced Neuroinflammation and Brain Mitochondrial Dysfunction

Area of Science:

• Neuroscience
• Immunology
• Endocrinology

Background:

• Sepsis is a life-threatening condition with increased risk in immunocompromised individuals, such as those with diabetes mellitus (DM).
• Diabetes impacts immune function, potentially worsening outcomes in sepsis patients.
• Neuroinflammation and neurochemical changes are critical aspects of sepsis-induced organ dysfunction.

Purpose of the Study:

• To investigate the relationship between type 1 diabetes and sepsis in Wistar rats.
• To assess the impact of diabetes on sepsis-induced neuroinflammatory and neurochemical alterations in the hippocampus and prefrontal cortex.
• To evaluate changes in cytokine levels, neurotrophic factors, and mitochondrial function.

Main Methods:

• Type 1 diabetes was induced in Wistar rats using alloxan.
• Sepsis was induced via cecal ligation and perforation (CLP).
• Hippocampus and prefrontal cortex tissues were analyzed 24 hours post-CLP for IL-6, IL-10, BDNF, NGF, and mitochondrial respiratory chain complex activity.

Main Results:

• Diabetes exacerbated sepsis-induced inflammation, indicated by increased IL-6 and decreased IL-10 levels specifically in the hippocampus.
• A significant reduction in Nerve Growth Factor (NGF) levels was observed in the hippocampus.
• Impairment of mitochondrial respiratory chain complexes I and II activity was noted in the hippocampus of diabetic rats post-sepsis.

Conclusions:

• Diabetes mellitus worsens neuroinflammation in the hippocampus following sepsis.
• Sepsis in diabetic rats leads to mitochondrial dysfunction and reduced NGF levels in the hippocampus.
• These findings highlight the detrimental effects of diabetes on brain health during sepsis.