Studies on immunoreactive pancreatic elastase 2 in human serum

Area of Science:

• Biochemistry
• Immunology
• Clinical Chemistry

Background:

• Human pancreatic elastase 2 (hPE2) is an enzyme involved in pancreatic function.
• Understanding hPE2 levels in plasma is crucial for diagnosing pancreatic conditions.
• Previous methods for hPE2 quantification were limited.

Purpose of the Study:

• To develop and validate a radioimmunoassay (RIA) for quantifying human pancreatic elastase 2 (hPE2) in plasma.
• To establish normal plasma concentrations of hPE2.
• To investigate the behavior of hPE2 in plasma, particularly in relation to pancreatitis.

Main Methods:

• Development of a radioimmunoassay (RIA) using DFP-inactivated pancreatic elastase 2 as both standard and tracer.
• Measurement of immunoreactive hPE2 concentrations in normal human plasma.
• Analysis of plasma samples from patients with acute pancreatitis.
• In vitro studies to assess complex formation between hPE2 and alpha 1-antitrypsin.

Main Results:

• The developed RIA provides a reliable method for hPE2 quantification.
• Normal human plasma contains approximately 60 micrograms of immunoreactive hPE2.
• Plasma hPE2 levels significantly increase in cases of acute pancreatitis.
• hPE2 circulates in plasma as a complex with a molecular size larger than the proenzyme.
• In vitro experiments confirmed the formation of a complex between hPE2 and alpha 1-antitrypsin.

Conclusions:

• The radioimmunoassay is effective for measuring human pancreatic elastase 2.
• Elevated plasma hPE2 is a potential biomarker for acute pancreatitis.
• Proelastase is rapidly bound by alpha 1-antitrypsin upon release into extracellular fluids, forming a complex that appears in plasma.