In a previous study we established colony assays suitable for studying murine adult (2–4 months) pancreatic progenitor cells plated in semisolid media containing methylcellulose and extracellular matrix proteins. Using these assays, we found robust in vitro progenitor cell activities (multilineage differentiation and self-renewal) from pancreatic cells of adult mice in the CD-1 outbred background. However, it was not clear whether progenitor cell activities can be detected from inbred mice, a preferred mouse model for various genetic studies. It was also not clear whether a single cell is sufficient to self-renew. Here, we show that fluorescent activated cell sorting pancreatic CD133+ but not CD133− cells from adult C57Bl/6 inbred mice are enriched for progenitor cells that self-renew and give rise to multilineage colonies in vitro. The number of cells in a colony is in proportion to its diameter. Around 60% of single handpicked 3-week-old colonies express trilineage markers, indicating most progenitors are tripotent for ductal, acinar, and endocrine lineage differentiation. Approximately 80% of primary (freshly sorted) colony-forming progenitor cells are capable of giving rise to secondary progenitors in vitro, indicating that a majority of the primary progenitors self-renew. A single cell is sufficient for self-renewal and a Wnt agonist, R-Spondin1, enhances the number of secondary progenitors from the primary progenitors. Together, our pancreatic colony assays allow quantitative analyses of progenitors at a single-cell level from inbred mice. These assays will be useful for elucidating in vitro mechanisms of pancreatic progenitor cell biology.
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