Relationship between carbachol hyperstimulation-induced pancreatic acinar cellular injury and trypsinogen or NF-κB activation in ratsin vitro

Abstract

The relationship between M3 cholinergic receptor agonist (carbachol) hyperstimulation-induced pancreatic acinar cellular injury and trypsinogen activation or NF-κB activation in rats was studiedin vitro. Rat pancreatic acinar cells were isolated, cultured and treated with carbachol, the active protease inhibitor (pefabloc), and NF-κB inhibitor (PDTC)in vitro. Intracellular trypsin activity was measured by using a fluorogenic substrate. The cellular injury was evaluated by measuring the leakage of LDH from pancreatic acinar cells. The results showed that as compared with control group, 10⁻³ mol/L carbachol induced a significant increase of the intracellular trypsin activity and the leakage of LDH from pancreatic acinar cells. Pretreatment with 2 mmol/L pefabloc could significantly decrease the activity of trypsin and the leakage of LDH from pancreatic acinar cells (P<0.01) following the treatment with a high concentration of carbachol (10⁻³ mol/L)in vitro. The addition of 10⁻² mol/L PDTC didn't result in a significant decrease in the activity of trypsin and the leakage of LDH from pancreatic acinar cells treated with a high concentration of carbachol (10⁻³ mol/L)in vitro (P>0.05). It was concluded that intracellular trypsinogen activation is likely involved in pancreatic acinar cellular injury induced by carbachol hyperstimulationin vitro. NF-κB activation may not be involved in pancreatic acinar cellular injury induced by carbachol hyperstimulationin vitro.

Keywords

pancreatic acinar cell injury / carbachol / intracelluar trypsinogen activation / NF-κB

References

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