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Carcinogenesis Advance Access published online on February 25, 2006
Carcinogenesis, doi:10.1093/carcin/bgi378
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org
Received September 1, 2005
Revised February 14, 2006
Accepted February 19, 2006

CANCER BIOLOGY

Activation of the hedgehog pathway in human hepatocellular carcinomas

Shuhong Huang 1 #, Jing He 2 #, Xiaoli Zhang 2 #, Yuehong Bian 1, Ling Yang 1, Guorui Xie 1, Kefei Zhang 3, Wendell Tang 4, Arwen A. Stelter 2, Qian Wang 3, Hongwei Zhang 1, and Jingwu Xie 2 *

1 Institute of Developmental Biology, School of Life Sciences, Shandong University, Jinan, P.R. China
2 Sealy Center for Cancer Cell Biology, Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, Texas 77555-1048
3 Dept. of Hepatobiliary Surgery, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road, Guangzhou, 510080, P.R. China
4 Department of Pathology, University of Texas Medical Branch, Galveston, Texas 77555-1048

* To whom correspondence should be addressed.
Jingwu Xie, E-mail: jinxie{at}utmb.edu


  Abstract

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% 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.

# These authors contributed equally to this work
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