共查询到20条相似文献,搜索用时 31 毫秒
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Kidney epithelia develop from the metanephric mesenchyme after receiving inductive signals from the ureteric bud and from the renal stroma. However, it is not clear how these signals induce the different types of epithelia that make up the nephron. To investigate inductive signaling, we have isolated clusters of epithelial progenitors from the metanephric mesenchyme, thereby separating them from the renal stroma. When the isolated progenitors were treated with the ureteric bud factor LIF, they expressed epithelial proteins (ZO-1, E-cadherin, laminin alpha(5)) and produced nephrons (36 glomeruli with 58 tubules), indicating that they are the target of inductive signaling from the ureteric bud, and that renal stroma is not absolutely required for epithelial development in vitro. In fact, stroma-depleted epithelial progenitors produced sevenfold more glomeruli than did intact metanephric mesenchyme (5 glomeruli, 127 tubules). Conversely, when epithelial progenitors were treated with both LIF and proteins secreted from a renal stromal cell line, glomerulogenesis was abolished but tubular epithelia were expanded (0 glomeruli, 47 tubules). Hence, by isolating epithelial progenitors from the metanephric mesenchyme, we show that they are targeted by factors from the ureteric bud and from the renal stroma, and that epithelial diversification is stimulated by the ureteric bud and limited by renal stroma. 相似文献
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The beta-catenin/TCF-4 complex imposes a crypt progenitor phenotype on colorectal cancer cells 总被引:56,自引:0,他引:56
van de Wetering M Sancho E Verweij C de Lau W Oving I Hurlstone A van der Horn K Batlle E Coudreuse D Haramis AP Tjon-Pon-Fong M Moerer P van den Born M Soete G Pals S Eilers M Medema R Clevers H 《Cell》2002,111(2):241-250
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Regulation of LEF-1/TCF transcription factors by Wnt and other signals 总被引:34,自引:0,他引:34
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The beta-catenin/T-cell factor/lymphocyte enhancer factor signaling pathway is required for normal and stress-induced cardiac hypertrophy
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Chen X Shevtsov SP Hsich E Cui L Haq S Aronovitz M Kerkelä R Molkentin JD Liao R Salomon RN Patten R Force T 《Molecular and cellular biology》2006,26(12):4462-4473
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The renewal and differentiation of Isl1+ cardiovascular progenitors are controlled by a Wnt/beta-catenin pathway 总被引:3,自引:0,他引:3
Qyang Y Martin-Puig S Chiravuri M Chen S Xu H Bu L Jiang X Lin L Granger A Moretti A Caron L Wu X Clarke J Taketo MM Laugwitz KL Moon RT Gruber P Evans SM Ding S Chien KR 《Cell Stem Cell》2007,1(2):165-179
Isl1(+) cardiovascular progenitors and their downstream progeny play a pivotal role in cardiogenesis and lineage diversification of the heart. The mechanisms that control their renewal and differentiation are largely unknown. Herein, we show that the Wnt/beta-catenin pathway is a major component by which cardiac mesenchymal cells modulate the prespecification, renewal, and differentiation of isl1(+) cardiovascular progenitors. This microenvironment can be reconstituted by a Wnt3a-secreting feeder layer with ES cell-derived, embryonic, and postnatal isl1(+) cardiovascular progenitors. In vivo activation of beta-catenin signaling in isl1(+) progenitors of the secondary heart field leads to their massive accumulation, inhibition of differentiation, and outflow tract (OFT) morphogenic defects. In addition, the mitosis rate in OFT myocytes is significantly reduced following beta-catenin deletion in isl1(+) precursors. Agents that manipulate Wnt signals can markedly expand isl1(+) progenitors from human neonatal hearts, a key advance toward the cloning of human isl1(+) heart progenitors. 相似文献
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Wnt/beta-catenin signaling: turning the switch 总被引:1,自引:0,他引:1
Cadigan KM 《Developmental cell》2008,14(3):322-323
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