Leptin modulates the inflammatory response in acute pancreatitis

Area of Science:

• Endocrinology
• Gastroenterology
• Pathophysiology

Background:

• Leptin, a hormone regulating appetite and body weight, has known receptors in the pancreas.
• The role of leptin in pancreatitis, however, remained unclear prior to this study.

Purpose of the Study:

• To measure plasma leptin levels in rats and humans with acute pancreatitis.
• To investigate the therapeutic potential of exogenous leptin in a rat model of acute pancreatitis.

Main Methods:

• Caerulein-induced pancreatitis (CIP) was established in Wistar rats.
• Plasma leptin levels, pancreatic leptin expression, and cytokine levels (TNF-alpha, IL-4) were analyzed.
• The effects of exogenous leptin administration on CIP and related molecular markers were evaluated.
• Plasma leptin levels were also assessed in human patients with acute pancreatitis.

Main Results:

• Rats with CIP exhibited significantly elevated plasma leptin levels and increased pancreatic leptin expression.
• Exogenous leptin administration attenuated pancreatitis severity in rats, reducing pancreatic weight, inflammation, and iNOS expression.
• Human patients with acute pancreatitis showed markedly higher plasma leptin concentrations compared to healthy controls.

Conclusions:

• Acute pancreatitis is characterized by elevated plasma leptin levels in both animal models and human patients.
• The pancreas itself may contribute to increased local leptin production during pancreatitis.
• Leptin demonstrates a protective effect against acute pancreatitis in rats, potentially via nitric oxide pathway modulation.