1. Finely dissect the pancreas into small fragments using a blade.
2. Subject fragments to digestion in a solution containing 1 mg/ml collagenase type V (Solarbio, C8170) in DMEM/F12 (Gibco, C11330500BT) for 5-10 minutes at 37 °C.
3. Halt the enzymatic reaction by diluting the collagenase solution with chilled (4 °C) PBS.
4. Obtain cell pellets through centrifugation at 300g for 5 minutes at 4 °C.
5. Further digest pellets with 1 ml TrypLE Express (Gibco, 12604013) at 37 °C.
6. Terminate the reaction by diluting the solution with chilled (4 °C) PBS, and collect cell pellets by centrifugation at 300g for 5 minutes at 4 °C.
7. Incubate the cell pellet with a 200 U/ml DNase I (Solarbio, D8070) solution in DMEM/F12. Terminate the reaction by diluting with chilled (4 °C) PBS, and collect cell pellets by centrifugation at 300g for 5 minutes at 4 °C.
8. Resuspend the cells in chilled sorting buffer (PBS pH 7.2 containing 0.5% (wt/vol) BSA and 2 mM EDTA) for subsequent FACS analysis.
9. For mice treated with caerulein, further stain the cells with APC-conjugated CD45 antibody to exclude immune cells.