T-cell factor/β-catenin activity is suppressed in two different models of autosomal dominant polycystic kidney disease.

T-cell factor/β-catenin activity is suppressed in two different models of autosomal dominant polycystic kidney disease.
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T细胞因子/β-catenin活性在两种不同的常染色体显性多囊肾脏疾病中抑制。

DOI:
10.1038/ki.2011.56
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发表时间:
2011-07
影响因子:
19.6
通讯作者:
--
中科院分区:
医学1区
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--
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在小鼠肾脏发育过程中,典型的 WNT 信号在肾小管中高度活跃,直到胚胎 E16-E18 日左右,此时 β-连环蛋白转录活性逐渐局限于肾源区。几项体外研究发现纤毛信号传导与 β-连环蛋白调节之间存在联系。已知纤毛蛋白基因 PKD1 和 PKD2 在常染色体显性多囊肾病中发生突变,之前的研究提出这些突变可能导致无法抑制典型的 WNT 信号活性;异常的活性可能会导致囊性表型。然而,在这项研究中,我们表明,由 TCF/β-catenin-lacZ 报告基因定义的经典 WNT 活性的抑制在两个独立的多囊肾模型中是正常的。我们将 TCF/β-catenin-lacZ 报告小鼠与 Pkd1 或 Pkd2 突变小鼠进行杂交,发现肾囊肿内壁细胞中没有 β-半乳糖苷酶染色。这表明,在这些常染色体显性多囊肾病模型中,过度的β-连环蛋白转录活性可能不会促进囊肿发生。
During murine kidney development, canonical WNT signalling is highly active in the renal tubules until about embryonic day E16-E18 when β-catenin transcriptional activity becomes progressively restricted to the nephrogenic zone. Several in vitro studies have found a link between cilial signalling and β-catenin regulation. The cilial protein genes PKD1 and PKD2 are known to be mutated in autosomal dominant polycystic kidney disease and previous studies proposed that these mutations could lead to a failure to suppress canonical WNT signalling activity; aberrant activity might then contribute to the cystic phenotype. However, in this study, we show that suppression of canonical WNT activity, defined by a TCF/β-catenin-lacZ reporter, is normal in two independent models of polycystic kidney disease. We crossed a TCF/β-catenin-lacZ reporter mouse with mice Pkd1 or Pkd2 mutations and found that there was no β-galactosidase staining in cells lining the renal cysts. This suggests that excessive β-catenin transcriptional activity may not contribute to cystogenesis in these models of autosomal dominant polycystic kidney disease.
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