Abstract
The Sonic hedgehog (SHH) signaling and STAT3 pathways play important roles during carcinogenesis with possible interaction. To determine the association of the activation of SHH signaling pathway and STAT3 pathway in carcinogenesis of human non-small cell lung carcinomas (NSCLC), firstly we examined the expression of SHH signaling molecules including SHH, Gli1(glioma-associated oncogene homolog 1) and HHIP (Hh interacting protein), as well as p-STAT3 (phosphorylation at Tyr705) by immunohistochemistry in 87 cases of NSCLC, 12 atypical adenomatous hyperplasia (AAH) and 20 adjacent normal lung tissues. The expression of SHH, Gli1, HHIP and p-STAT3 was detected respectively in 87/87(100%), 74/87(85.1%), 75/87(86.2%) and 54/87(62.1%) of the NSCLC cases, but not in the adjacent normal lung parenchyma. Ligand-dependent SHH pathway activation and STAT3 signaling activation were observed in most cases of NSCLC, and the high SHH pathway activation rate and STAT3 activation rate were significantly higher in adenocarcinoma compared with squamous cell carcinomas and large cell carcinomas (P<0.05). Both SHH and STAT3 pathway activation level correlated with histological grade in adenocarcinoma, being higher in well-differentiated types (P<0...Continue Reading
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