The serum complement system--a mediator of acute pancreatitis

Area of Science:

• Immunology
• Gastroenterology
• Pathology

Background:

• Acute pancreatitis involves complex inflammatory pathways.
• The complement system's role in initiating pancreatic injury remains incompletely understood.

Purpose of the Study:

• To investigate the complement system's involvement in the initial membrane lesion of acute pancreatitis.
• To determine if complement activation alone can induce acute pancreatitis.

Main Methods:

• Induction of experimental pancreatitis in rats using sodium-taurocholate.
• Immunofluorescence staining to detect complement component C3 deposition.
• In vitro lysis assay using isolated pancreatic acinar cells and activated serum.
• Induction of pancreatitis via complement activation using cobra venom factor.

Main Results:

• A significant decline in serum complement levels was observed during experimental pancreatitis.
• Complement component C3 deposition was evident in affected pancreatic tissue.
• Isolated pancreatic acinar cells were lysed by activated complement, but not by inactivated or C6-deficient serum.
• Complement activation alone, induced by cobra venom factor, successfully triggered acute pancreatitis.

Conclusions:

• The complement system is critically involved in the initial membrane damage during acute pancreatitis.
• Complement activation directly contributes to the pathogenesis of acute pancreatitis.
• Targeting the complement system may offer a therapeutic strategy for acute pancreatitis.