Leptin exacerbates sepsis-mediated morbidity and mortality

Area of Science:

• Endocrinology
• Immunology
• Pathophysiology

Background:

• Obesity is linked to increased sepsis risk and mortality.
• Leptin, an adipose hormone, is elevated in obesity and may influence sepsis outcomes.

Purpose of the Study:

• To investigate the role of leptin signaling in sepsis pathogenesis.
• To determine if leptin exacerbates sepsis and if blocking leptin signaling improves outcomes.

Main Methods:

• Utilized mouse models of endotoxemia and cecal ligation puncture (CLP).
• Administered leptin or leptin receptor-deficient mice.
• Conducted in vitro studies with monocytes and endothelial cells.
• Measured mortality, adhesion molecules, coagulation, organ infiltration, and endothelial barrier function.
• Analyzed soluble leptin receptor (sLR) levels in human septic patients.

Main Results:

• Leptin administration increased mortality and exacerbated sepsis symptoms in mice.
• Leptin deficiency protected mice from sepsis.
• Leptin induced endothelial dysfunction, partly mediated by monocytes.
• Increased soluble leptin receptor (sLR) levels in human sepsis correlated with disease severity.
• Administration of sLR improved survival in mouse sepsis models.

Conclusions:

• Leptin signaling plays a pathogenic role in sepsis.
• Targeting leptin signaling may offer a therapeutic strategy for sepsis.