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Protease inhibitors in acute human pancreatitis. Correlation between biochemical changes and clinical course
Abstract:
A clinical and biochemical analysis of 27 attacks of acute pancreatitis was made throughout the course of the disease. In severe attacks alpha 2-macroglobulin (alpha 2-M) decreased during the first days, reaching values in blood below 40% of the normal value. In addition, this remaining alpha 2-M had a decreased trypsin-binding capacity, indicating circulating alpha 2-M protease complexes. The inter-alpha-trypsin inhibitor concentration was also decreased, whereas alpha 1-proteinase inhibitor, antichymotrypsin, and pancreatic secretory trypsin inhibitor increased. All changes were most pronounced in the peritoneal fluid and were also closely correlated to the severity of the disease, assessed by both Ranson's and McMahon's classification systems. All patients with clinical complications had profound biochemical changes. In accordance with earlier findings, activation of both the complement and kinin systems seems possible in both blood and peritoneal fluid at the low alpha 2-M concentrations found in severe attacks.
Insights
In severe acute pancreatitis, alpha 2-macroglobulin (alpha 2-M) levels and trypsin-binding capacity decrease significantly. These biochemical changes correlate with disease severity and may indicate complement and kinin system activation.
Area of Science:
- Biochemistry
- Clinical Medicine
- Pathophysiology
Background:
- Acute pancreatitis is a serious condition with complex biochemical alterations.
- Understanding the role of protease inhibitors is crucial for assessing disease severity.
Purpose of the Study:
- To analyze the clinical and biochemical changes during acute pancreatitis attacks.
- To investigate the behavior of protease inhibitors and their correlation with disease severity.
Main Methods:
- Clinical and biochemical analysis of 27 acute pancreatitis attacks.
- Measurement of alpha 2-macroglobulin (alpha 2-M), inter-alpha-trypsin inhibitor, alpha 1-proteinase inhibitor, antichymotrypsin, and pancreatic secretory trypsin inhibitor.
- Correlation with Ranson's and McMahon's classification systems.
Main Results:
- Severe attacks showed decreased alpha 2-M levels (<40% of normal) and reduced trypsin-binding capacity.
- Decreased inter-alpha-trypsin inhibitor and increased alpha 1-proteinase inhibitor, antichymotrypsin, and pancreatic secretory trypsin inhibitor were observed.
- Biochemical changes were most pronounced in peritoneal fluid and correlated with disease severity and clinical complications.
Conclusions:
- Profound biochemical changes, particularly in protease inhibitor profiles, occur in severe acute pancreatitis.
- Low alpha 2-M concentrations in severe attacks may facilitate complement and kinin system activation.
- These findings highlight the potential for using protease inhibitor levels as biomarkers for acute pancreatitis severity.