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• W2012334457 abstract "Wnt signaling has been reported to block apoptosis and regulate differentiation of mesenchymal progenitors through inhibition of glycogen synthase kinase 3 and stabilization of β-catenin. The effects of Wnt in preadipocytes may be mediated through Frizzled (Fz) 1 and/or Fz2 as these Wnt receptors are expressed in preadipocytes and their expression declines upon induction of differentiation. We ectopically expressed constitutively active chimeras between Wnt8 and Fz1 or Fz2 in preadipocytes and mesenchymal precursor cells. Our results indicated that activated Fz1 increases stability of β-catenin, inhibits apoptosis, induces osteoblastogenesis, and inhibits adipogenesis. Although activated Fz2 does not influence apoptosis or osteoblastogenesis, it inhibits adipogenesis through a mechanism independent of β-catenin. An important mediator of the β-catenin-independent pathway appears to be calcineurin because inhibitors of this serine/threonine phosphatase partially rescue the block to adipogenesis caused by Wnt3a or activated Fz2. These data supported a model in which Wnt signaling inhibits adipogenesis through both β-catenin-dependent and β-catenin-independent mechanisms. Wnt signaling has been reported to block apoptosis and regulate differentiation of mesenchymal progenitors through inhibition of glycogen synthase kinase 3 and stabilization of β-catenin. The effects of Wnt in preadipocytes may be mediated through Frizzled (Fz) 1 and/or Fz2 as these Wnt receptors are expressed in preadipocytes and their expression declines upon induction of differentiation. We ectopically expressed constitutively active chimeras between Wnt8 and Fz1 or Fz2 in preadipocytes and mesenchymal precursor cells. Our results indicated that activated Fz1 increases stability of β-catenin, inhibits apoptosis, induces osteoblastogenesis, and inhibits adipogenesis. Although activated Fz2 does not influence apoptosis or osteoblastogenesis, it inhibits adipogenesis through a mechanism independent of β-catenin. An important mediator of the β-catenin-independent pathway appears to be calcineurin because inhibitors of this serine/threonine phosphatase partially rescue the block to adipogenesis caused by Wnt3a or activated Fz2. These data supported a model in which Wnt signaling inhibits adipogenesis through both β-catenin-dependent and β-catenin-independent mechanisms." @default.
• W2012334457 created "2016-06-24" @default.
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• W2012334457 date "2005-06-01" @default.
• W2012334457 modified "2023-10-14" @default.
• W2012334457 title "Wnt Signaling Inhibits Adipogenesis through β-Catenin-dependent and -independent Mechanisms" @default.
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• W2012334457 doi "https://doi.org/10.1074/jbc.m501080200" @default.
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