Carcinogenesis Advance Access originally published online on February 25, 2006
Carcinogenesis 2006 27(7):1334-1340; doi:10.1093/carcin/bgi378
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Activation of the hedgehog pathway in human hepatocellular carcinomas
Department of Pharmacology and Toxicology, Sealy Center for Cancer Cell Biology and 1 Department of Pathology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-1048, USA, 2 Institute of Developmental Biology, School of Life Sciences, Shandong University, Jinan, P.R. China and 3 Department of Hepatobiliary Surgery, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road, Guangzhou, 510080, P.R. China
* To whom correspondence should be addressed. Tel: (409) 747 1845; Fax: (409) 747 1938; Email: jinxie{at}utmb.edu; wangqian_dr{at}126.com; zhw{at}sdu.edu.cn
Liver cancers, the majority of which are hepatocellular carcinomas (HCCs), rank as the fourth in cancer mortality worldwide and are the most rapidly increasing type of cancer in the United States. However, the molecular mechanisms underlying HCC development are not well understood. Activation of the hedgehog pathway is shown to be involved in several types of gastrointestinal cancers. Here, we provide evidence to indicate that hedgehog signaling activation occurs frequently in HCC. We detect expression of Shh, PTCH1 and Gli1 in 115 cases of HCC and in 44 liver tissues adjacent to the tumor. Expression of Shh is detectable in about 60% of HCCs examined. Consistent with this, hedgehog target genes PTCH1 and Gli1 are expressed in over 50% of the tumors, suggesting that the hedgehog pathway is frequently activated in HCCs. Of five cell lines screened, we found Hep3B, Huh7 and PLC/PRF/5 cells with detectable hedgehog target genes. Specific inhibition of hedgehog signaling in these three cell lines by smoothened (SMO) antagonist, KAAD-cyclopamine, or with Shh neutralizing antibodies decreases expression of hedgehog target genes, inhibits cell growth and results in apoptosis. In contrast, no effects are observed after these treatments in HCC36 and HepG2 cells, which do not have detectable hedgehog signaling. Thus, our data indicate that hedgehog signaling activation is an important event for development of human HCCs.
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