Notch signaling controls multiple steps of pancreatic differentiation.

Murtaugh LC, Stanger BZ, Kwan KM, Melton DA
Proc Natl Acad Sci U S A. 2003 100 (25): 14920-5

PMID: 14657333 · PMCID: PMC299853 · DOI:10.1073/pnas.2436557100

Multiple cell types of the pancreas appear asynchronously during embryogenesis, which requires that pancreatic progenitor cell potential changes over time. Loss-of-function studies have shown that Notch signaling modulates the differentiation of these progenitors, but it remains unclear how and when the Notch pathway acts. We established a modular transgenic system to heritably activate mouse Notch1 in multiple types of progenitors and differentiated cells. We find that misexpression of activated Notch in Pdx1-expressing progenitor cells prevents differentiation of both exocrine and endocrine lineages. Progenitors remain trapped in an undifferentiated state even if Notch activation occurs long after the pancreas has been specified. Furthermore, endocrine differentiation is associated with escape from this activity, because Ngn3-expressing endocrine precursors are susceptible to Notch inhibition, whereas fully differentiated endocrine cells are resistant.

MeSH Terms (20)

Animals Basic Helix-Loop-Helix Transcription Factors Cell Differentiation Cell Lineage Female Homeodomain Proteins Islets of Langerhans Male Membrane Proteins Mice Mice, Inbred C57BL Microscopy, Fluorescence Nerve Tissue Proteins Pancreas Receptors, Notch Signal Transduction Stem Cells Time Factors Tissue Distribution Trans-Activators

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