Hedgehog signaling in small-cell lung cancer: frequent in vivo but a rare event in vitro

Lung Cancer : Journal of the International Association for the Study of Lung Cancer
Janni VestergaardLars Allan Larsen

Abstract

The hedgehog (HH) signaling pathway plays multiple roles during embryonic development and increasing evidence suggests that this embryonic pathway is involved in development and progression of several human cancers including those of the brain, skin, lung and gastrointestinal tract. To investigate HH signaling activity in small-cell lung cancer (SCLC), we have performed gene expression analysis on members of the HH pathway on a panel of 20 SCLC cell lines. Sonic hedgehog (SHH) expression was detected in only DMS79 and GLC16 and only DMS114 expressed detectable protein levels of GLI1, one of the key transcription factors of the pathway. Involvement of HH signaling in SCLC proliferation was investigated in a subset of cell lines using the HH signaling inhibitor cyclopamine or small interfering RNA (siRNA) against GLI1. Cells expressing GLI1 responded only weakly to both cyclopamine and RNA interference, suggesting that HH signaling plays only a minor role in the growth of SCLC cell lines. To investigate HH pathway activity in vivo, GLI1 immunohistochemistry was performed on SCLC tumors. Interestingly, GLI1 was expressed in most SCLC tumors studied, indicating that HH signaling is important for in vivo growth of SCLC but establish...Continue Reading

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