These data indicate normal lung morphogenesis and are con sistent with our previous reports. The mRNA expression patterns of canonical WNT ligands were then examined in the developing human lung by in situ hybridization. WNT2 expression was obviously restricted to epithelial cells of the fetal lung at 7 www.selleckchem.com/products/azd9291.html W and 17 W but was dramatically downregulated at 12 W and 21 W. WNT7B transcripts were clearly detected in the respira tory airways from 7 W to 17 W but were barely detectable at 21 W. Expression of canonical WNT signaling receptors Inhibitors,Modulators,Libraries in the developing human lung In situ hybridization was also used to determine the expression patterns of canonical WNT/B CATENIN sig naling receptors and co receptors in the developing human lung.
FZD4, FZD7, LRP5 and LRP6, which exhibited very similar expression pat terns, were initially restricted to the conducting airways and the peripheral epithelium from 7 W to 17 W. Expression was subsequently maintained at a relatively low level in the peripheral epithelium at 21 W. Expression of canonical WNT signaling transducers in Inhibitors,Modulators,Libraries the developing human lung The mRNA expression pattern of canonical WNT/ B CATENIN signal transducers DVL2, DVL3, GSK 3B, B CATENIN, APC and Inhibitors,Modulators,Libraries AXIN2 was analyzed in fetal human lung by in situ hybridization. Expression of DVL2, GSK 3B and APC was distinctively confined to the peripheral epithelium from the pseudoglandular to the canalicular stage, with the exception of GSK 3B transcripts, which were detected at lower levels in both the respiratory epithelium and the pulmonary mesenchyme at 7 W.
In contrast, three other transducers, DVL3, B CATENIN and AXIN2, were expressed strongly in the peripheral epithelium and weakly throughout the mesenchyme surrounding the ter minal buds from the pseudoglandular Inhibitors,Modulators,Libraries to the canalicular stage. The strength of the signals attained by in situ hybridization showed that DVL2, DVL3 and AXIN2 ex pression remained relatively high from 7 W to 17 W and was obviously downre gulated at 21 W. Interestingly, the signals of GSK 3B, B CATENIN and APC transcripts appeared strong at 7 W and 17 W, but were dramatically reduced and almost un detectable at 12 W and 21 W. Expression of canonical WNT signaling transcription factors in the developing human lung The distribution of canonical WNT/B CATENIN signal ing transcription factors was examined during human lung development by in situ hybridization.
TCF4 was highly expressed in the peripheral epithelium and in small amounts in the surrounding mesenchymal cells during the pseudoglandular stage, while LEF1 was predominantly Inhibitors,Modulators,Libraries expressed in the respiratory epithelium during this period. Subsequently, TCF4 and LEF1 expression was downregu lated significantly in both the peripheral Cabozantinib prostate epithelium and the mesenchyme at the canalicular stage.
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