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Quantitative assay for acute intestinal inflammation based on myeloperoxidase activity. Assessment of inflammation in
Abstract:
An assay was devised to quantitate acute intestinal inflammation based on the assessment of myeloperoxidase activity. Myeloperoxidase is an enzyme found in neutrophils and, in much smaller quantities, in monocytes and macrophages. Myeloperoxidase was solubilized with hexadecyltrimethylammonium bromide and myeloperoxidase activity was measured with a dianisidine-H2O2 assay. In neutrophil suspensions, myeloperoxidase activity was directly related to cell number down to as few as 500 cells. Myeloperoxidase activity was assayed in two animal models of inflammation: acetic acid-induced colitis in rats and Clostridium difficile enterotoxin-induced enteritis in hamsters. In both models, the activity of myeloperoxidase solubilized from the inflamed tissue was directly proportional to the number of neutrophils seen in histologic sections. Histologic evaluation of neutrophil accumulation was performed by counting the number of neutrophils in a histologic section 0.18 mm long and 5 micron thick. In both animal models, myeloperoxidase activity was linearly related to neutrophil number from 400 and 4000 cells/mm. Myeloperoxidase activity from chronically inflamed colon, in which both neutrophils and histiocytes were present, was directly related to neutrophil content. Histiocytes did not contribute significantly to myeloperoxidase activity. The determination of myeloperoxidase activity in the intestine is a simple biochemical assay that can be used to quantitate inflammation.
Insights
A new assay quantifies intestinal inflammation by measuring myeloperoxidase (MPO) enzyme activity, which is abundant in neutrophils. This method accurately reflects neutrophil counts in animal models, offering a simple biochemical tool for inflammation assessment.
Area of Science:
- Biochemistry
- Immunology
- Gastroenterology
Background:
- Acute intestinal inflammation is a significant clinical concern.
- Accurate quantification of inflammatory cell infiltration is crucial for research and diagnosis.
- Myeloperoxidase (MPO) is an enzyme predominantly found in neutrophils, making it a potential marker for inflammation.
Purpose of the Study:
- To develop and validate a biochemical assay for quantifying acute intestinal inflammation.
- To assess the utility of myeloperoxidase activity as a surrogate marker for neutrophil infiltration in inflamed intestinal tissue.
- To establish the correlation between myeloperoxidase activity and neutrophil numbers in animal models of intestinal inflammation.
Main Methods:
- Myeloperoxidase was solubilized from intestinal tissue using hexadecyltrimethylammonium bromide.
- Myeloperoxidase activity was measured using a dianisidine-H2O2 assay.
- Neutrophil infiltration was quantified via histological analysis and correlated with myeloperoxidase activity in rat and hamster models of intestinal inflammation.
Main Results:
- Myeloperoxidase activity in neutrophil suspensions showed a direct relationship with cell number, detectable down to 500 cells.
- In animal models of colitis and enteritis, myeloperoxidase activity was directly proportional to neutrophil counts in histological sections.
- A linear relationship was observed between myeloperoxidase activity and neutrophil numbers (400-4000 cells/mm) in inflamed intestinal tissue.
- Histiocytes did not significantly contribute to the measured myeloperoxidase activity in chronically inflamed tissue.
Conclusions:
- The determination of myeloperoxidase activity provides a simple and effective biochemical assay for quantifying acute intestinal inflammation.
- This assay accurately reflects neutrophil infiltration, a key indicator of intestinal inflammation.
- Myeloperoxidase activity serves as a reliable marker for assessing neutrophil accumulation in various models of intestinal inflammation.
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