大鼠急性胰腺炎时胰腺腺泡细胞凋亡及Bax, Caspase-8的表达

Emodin protects from deoxycholic acid-induced AR42J cell damage

AIM: To investigate whether emodin exerts a protect effect against deoxycholic acid (DCA)-induced cell damage in rat pancreatic acinar cell line AR42J.

METHODS: AR42J cells were divided into five groups: normal control cells, cells treated with 0.4 or 0.8 mmol/L DCA, and those treated with 0.4 or 0.8 mmol/L DCA plus emodin (20 mg/L). The rates of apoptosis and necrosis were detected by flow cytometry and AV/PI double staining. The activity of amylase in the medium and cytoplasm was determined.

RESULTS: DCA at a dose of 0.4 mmol/L mainly induced the apoptosis of AR42J cells, while 0.8 mmol/L of DCA induced the necrosis of AR42J cells. Emodin significantly reduced DCA-induced late apoptosis (27.9% vs 34.1%) and necrosis (38.1% vs 45.4%), but did not significantly change the activity of amylase in the medium and cytoplasm of AR42J cells.

CONCLUSION: Emodin has some protective effects against DCA-induced AR42J cell damage, but does not influence amylase synthesis and secretion by acinar cells.

Cytotoxic effects of different bile acids on pancreatic acinar AR42J cells

AIM: To investigate the cytotoxic effects of seven different bile acids on pancreatic acinar AR42J cells by detecting the survival, necrosis and apoptosis of AR42J cells incubated with different bile acids.

METHODS: The effects of different bile acids on the survival of rat AR42J cells were detected by methyl thiazolyl tetrazolium (MTT) assay. Cell morphological changes were observed by microscopy and fluorescence microscopy. Cell apoptosis and necrosis were determined by annexin-V and propidium iodide double staining and flow cytometry.

RESULTS: Cholic acid (CA), glycocholic acid (GCA), and glycodeoxycholic acid (GDCA) at doses ranging from 0.1 to 1.0 mmol/L had no cytotoxic effects on AR42J cells. Deoxycholic acid (DCA), chenodeoxycholic acid (CDCA) and lithocholic acid (LCA) at doses ≥ 0.3 mmol/L, and taurodeoxycholic acid (TDCA) at doses ≥ 0.4 mmol/L induced cytotoxic effects on AR42J cells in a dose-dependent manner. No significant differences were noted in the apoptotic rate and necrotic rate between untreated AR42J cells and those treated with 0.8 mmol/L of CA (apoptotic rate: 1.2% vs 0.9%; necrotic rate: 1.0% vs 1.0%). The apoptotic rate and necrotic rate of AR42J cells treated with 0.4 mmol/L of DCA were 45.2% and 8.9%, respectively, while those treated with 0.8 mmol/L of DCA were 18.6% and 45.4%, respectively.

CONCLUSION: Different bile acids exert different cytotoxic effects on AR42J cells. Some bile acids induce the apoptosis and/or necrosis of AR42J cells in a dose-dependent manner.