Rattus norvegicus albus
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ABSTRACT:
PROVIDER: PRJNA306922 | ENA |
REPOSITORIES: ENA
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2021-07-01 | PXD018221 | JPOST Repository
Project description:A small molecule, AT7867, promotes proliferation of human pluripotent stem cell-derived pancreatic progenitor cells (PPCs), yet detailed mechanisms of its proliferative effect were not fully understood. Here, we performed cell-based siRNA screening on a subset of genes to reveal that WNT7B is a growth factor of human PPCs as previously shown in mouse pancreas development. Although recombinant proteins had no in vitro activity, feeder cell lines stably expressing Wnt7a or Wnt7b enhanced PPC proliferation. Further analyses showed that canonical Wnt signaling pathway was not affected by AT7867 treatment as well as Wnt7a and Wnt7b. Knockdown of a non-canonical Wnt pathway component, PKCα, and its downstream substrate, MARCKS, blocked PPC proliferation suggesting a requirement of this pathway. Phosphoproteome analysis revealed that AT7867 inhibited Yin Yang 1 (YY1) phosphorylation at Ser118, which directly or indirectly regulated expression of WNT7B in PPCs. Taken together, non-canonical Wnt signaling mediated by WNT7B plays a critical role for the expansion of human PPC population that is a promising alternative cell source to generate β cells for the cure of diabetes.
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