In the adult pancreas, Notch-responsive CACs give rise to other ductal and endocrine cells and have the capacity to replicate. Immunodetection on sections through the pancreas of adult Tg(Tp1:VenusPest); Tg(Tp1:H2BmCherry).
a Comparison of Venus (green) and H2BmCherry (red) labeling showing a small duct containing H2BmCherry+ cells that have lost Venus. b Comparison of H2BmCherry (red) with the ductal marker 2F11 (green) showing some 2F11+ cells within a small duct co-expressing the stable H2BmCherry marker (yellow arrow). c Weak H2BmCherry labeling near the extremity of a ductular structure (terminal or intercalated duct) (yellow arrows); a CAC (intense H2BmCherry) at the tip of the terminal duct is indicated by an asterisk. d and d' (close-up) Some H2BmCherry+ cells, devoid of Venus (Notch off) co-express the beta cell marker Ins (white) (yellow arrows). Sections acquired in the head of the pancreas, at the level of the main endocrine islet. e–f' Detection of 5-ethynyl-2′-deoxyuridine (EdU) (red), Venus (green), and proliferating cell nuclear antigen (PCNA) (white) in Tg(Tp1:VenusPest) adult fish injected with EdU. The pancreas was analyzed 20 hours (1 day post injection) (e, e') and 5 days (f, f') after EdU injection