Journal Article

Activation of the hedgehog pathway in human hepatocellular carcinomas

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

in Carcinogenesis

Volume 27, issue 7, pages 1334-1340
Published in print July 2006 | ISSN: 0143-3334
Published online February 2006 | e-ISSN: 1460-2180 | DOI:

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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.

Keywords: DMEM, Dulbecco-modified essential medium; FBS, fetal bovine serum; HCCs, hepatocellular carcinomas; MTT, 1-(4,5-Dimethylthiazol-2-yl)-3,5-diphenylformazan; PCR, polymerase chain reaction; RT–PCR, reverse transcription–polymerase chain reaction; SMO, smoothened; TUNEL, terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling

Journal Article.  4848 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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