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Updated: Dec 31, 2025
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Preparing a Mice Model of Severe Acute Pancreatitis via a Combination of Caerulein and Lipopolysaccharide Intraperitoneal Injection
Published on: May 10, 2024
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Measuring digestive protease activation in the mouse pancreas
Dóra Mosztbacher1, Alexandra Demcsák2, Miklós Sahin-Tóth3
1Center for Exocrine Disorders, Department of Molecular and Cell Biology, Boston University, Henry M. Goldman School of Dental Medicine, Boston, MA, 02118, USA.
Summary
Optimizing pancreatitis research, this study refined methods for measuring digestive protease activation in mice. New protocols enhance accuracy for trypsin and chymotrypsin activity detection in pancreatitis studies.
Area of Science:
- Biochemistry
- Gastroenterology
- Animal Models
Background:
- Intrapancreatic protease activation is a key indicator of pancreatitis.
- Current methods in rodent models rely on measuring trypsin and chymotrypsin activity.
- Optimizing these assays is crucial for accurate pancreatitis research.
Purpose of the Study:
- To determine optimal conditions for measuring intrapancreatic trypsin and chymotrypsin activation in mice.
- To improve the sensitivity and reproducibility of pancreatitis-related protease assays.
Main Methods:
- Investigated effects of pancreatic homogenate amount and buffer composition (excluding BSA).
- Assessed the impact of sample preparation, including fresh vs. frozen homogenates.
- Compared different fluorogenic peptide substrates (Boc-Gln-Ala-Arg-AMC vs. Z-Gly-Pro-Arg-AMC) for trypsin measurement.
Main Results:
- Lower homogenate amounts and exclusion of BSA improved assay performance.
- Freshly prepared pancreatic homogenates yielded more reliable results than frozen samples.
- The Z-Gly-Pro-Arg-AMC substrate reduced background noise and increased sensitivity for cerulein-induced trypsin activation.
- Reproducible 20-fold and 200-fold increases in trypsin and chymotrypsin activity were observed, respectively.
Conclusions:
- Optimized protocols enhance the accuracy of measuring pancreatic protease activation in mouse models of pancreatitis.
- The refined methods provide a more sensitive and reliable approach for pancreatitis research.
- These findings facilitate better understanding and investigation of pancreatitis pathogenesis.
