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• W2069419570 abstract "Both BMP and Wnt signaling control stem cells in bulge/dermal papilla, intestinal crypt, and bone marrow. To explore their roles in the limbal niche, which govern corneal epithelial homeostasis, we established an in vitro model of sphere growth by reunion between single limbal epithelial progenitor cells (LEPCs) and aggregates of limbal niche cells (LNCs) in 3D Matrigel. Compared to LEPCs alone, spheres formed by LEPC+LNC exhibited higher clonal growth and less corneal epithelial differentiation. Furthermore, pSmad1/5/8 was in the nucleus of LEPCs, but not LNCs, and correlated with upregulation of BMP1, BMP3, BMP4, all three BMP receptors, and BMP target genes. Inactivation of BMP signaling in LNCs was correlated with upregulation of noggin preferentially expressed by LNCs. Additionally, β-catenin was stabilized in the perinuclear cytoplasm in LEPCs and correlated with upregulation of Wnt7A and FZD5 preferentially expressed by LEPCs. Inactivation of Wnt signaling in LNCs was correlated with upregulation of DKK1/2 by LNCs. Addition of XAV939 that expectedly downregulated perinuclear β-catenin in LEPCs led to significant reduction of epithelial clonal growth, but upregulated all three BMP receptors and downregulated LNC-derived noggin, resulting in activation of BMP signaling in LNCs. Addition of noggin that expectedly downregulated nuclear localization of pSmad1/5/8 in LEPCs led to nuclear localization of β-catenin in larger LEPCs but membrane relocation of β-catenin in smaller LEPCs and significant upregulation of DKK1/2. Hence, balancing acts between Wnt signaling and BMP signaling exist not only within LEPCs but also between LEPCs and LNCs to regulate clonal growth of LEPCs." @default.
• W2069419570 created "2016-06-24" @default.
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• W2069419570 date "2014-03-01" @default.
• W2069419570 modified "2023-09-26" @default.
• W2069419570 title "Integration of BMP/Wnt signaling to control clonal growth of limbal epithelial progenitor cells by niche cells" @default.
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• W2069419570 doi "https://doi.org/10.1016/j.scr.2014.01.003" @default.
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