Cell density sensing alters TGF-β signaling in a cell-type-specific manner, independent from Hippo pathway activation.

Cell density sensing alters TGF-β signaling in a cell-type-specific manner, independent from Hippo pathway activation.
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DOI:
10.1016/j.devcel.2015.01.011
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发表时间:
2015-03-09
期刊:
影响因子:
11.8
通讯作者:
Mauviel, Alain
Mauviel, Alain
中科院分区:
生物学1区
文献类型:
--
作者:
Nallet-Staub, Flore;Yin, Xueqian;Gilbert, Cristele;Marsaud, Veronique;Ben Mimoun, Saber;Javelaud, Delphine;Leof, Edward B.;Mauviel, Alain

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细胞间的接触抑制细胞的生长和增殖,部分是通过激活Hippo途径,该途径驱动转录辅助激活因子Yap和TAZ的磷酸化和核排斥。细胞密度和河马信号也被报道阻止转化生长因子β(转化生长因子β)的反应,这是基于磷酸化的YAP/TAZ将转化生长因子β激活的SMAD复合体隔离在细胞质中的能力。在此,我们提供了证据,证明上皮细胞极化干扰转化生长因子-β信号的上游,并独立于细胞质YAP/TAZ。相反,转化生长因子-β受体I和II的两极化呈现剥夺了顶端传递的转化生长因子-β接触其受体的途径。然而,基侧配基传递仍然完全有效地诱导转化生长因子-β反应。这些数据表明,细胞密度对转化生长因子-β信号的特异性抑制仅限于极化的上皮细胞,反映了转化生长因子-β受体的极化分布,从而影响SMAD的激活,而不是HIPPO途径的激活。
Cell-cell contacts inhibit cell growth and proliferation in part by activating the Hippo pathway that drives the phosphorylation and nuclear exclusion of the transcriptional coactivators YAP and TAZ. Cell density and Hippo signaling have also been reported to block transforming growth factor β (TGF-β) responses, based on the ability of phospho-YAP/TAZ to sequester TGF-β-activated SMAD complexes in the cytoplasm. Herein, we provide evidence that epithelial cell polarization interferes with TGF-β signaling well upstream and independent of cytoplasmic YAP/TAZ. Rather, polarized basolateral presentation of TGF-β receptors I and II deprives apically delivered TGF-β of access to its receptors. Basolateral ligand delivery nonetheless remains entirely effective to induce TGF-β responses. These data demonstrate that cell-type-specific inhibition of TGF-β signaling by cell density is restricted to polarized epithelial cells and reflects the polarized distribution of TGF-β receptors, which thus affects SMAD activation irrespective of Hippo pathway activation.
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