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Experimental acute infectious pancreatitis in rats: histological observations
A Manenti1, L Botticelli, R Bertoli
1Dipartimento di Patologia Umana ed Ereditaria, Università di Pavia.
Abstract:
Microbic contamination has been shown to be a secondary pathogenetic factor in different models of acute pancreatitis. In this paper, we developed an experimental bacterial model of necrotizing acute pancreatitis (NAP). Forty rats were treated by direct inoculation of a suspension of a clinically isolated strain of Escherichia coli, with three different single 0.33 ml injections, into the head, body and tail of the pancreas. Twenty five rats were sham operated and injected with saline. All animals were sacrificed at 48 hours, 4, 6, and 12 days. This experimental model appeared easy to execute without evidence of mortality. Histomorphologically, haemorrhagic NAP was observed, with its final recovery and minimal residual and focal fibrosis of the gland. As reported in the literature, our data underline the relevance of the bacterial component on pathogenesis of NAP, especially as an aggravating factor.
Insights
This study created a reliable rat model for necrotizing acute pancreatitis (NAP) using Escherichia coli. The findings highlight bacteria as a key aggravating factor in NAP development and progression.
Area of Science:
- Gastroenterology
- Microbiology
- Pathology
Background:
- Microbial contamination is a known secondary factor in acute pancreatitis.
- Understanding bacterial roles in pancreatitis pathogenesis is crucial for treatment.
Purpose of the Study:
- To develop a reproducible experimental bacterial model of necrotizing acute pancreatitis (NAP).
- To investigate the role of bacterial infection as an aggravating factor in pancreatitis.
Main Methods:
- Developed a necrotizing acute pancreatitis (NAP) model in 40 rats by pancreatic inoculation of Escherichia coli.
- Used a sham-operated group (25 rats) injected with saline for control.
- Monitored animals over 12 days, with sacrifice at specific time points (48 hours, 4, 6, 12 days).
Main Results:
- The experimental model was easily executable with no mortality observed.
- Histomorphological analysis revealed hemorrhagic NAP with eventual recovery and minimal residual fibrosis.
- Confirmed the significant role of bacterial components in exacerbating NAP pathogenesis.
Conclusions:
- The developed bacterial model effectively replicates key features of necrotizing acute pancreatitis.
- Bacterial infection significantly aggravates the pathogenesis of acute pancreatitis.
- This model provides a valuable tool for further research into NAP and its management.