Hedgehog signalling is crucial for development and is deregulated in several tumours, including medulloblastoma. Regulation of the transcriptional activity of Gli (glioma-associated oncogene) proteins, effectors of the Hedgehog pathway, is poorly understood. We show here that Gli1 and Gli2 are acetylated proteins and that their HDAC-mediated deacetylation promotes transcriptional activation and sustains a positive autoregulatory loop through Hedgehog-induced upregulation of HDAC1. This mechanism is turned off by HDAC1 degradation through an E3 ubiquitin ligase complex formed by Cullin3 and REN, a Gli antagonist lost in human medulloblastoma. Whereas high HDAC1 and low REN expression in neural progenitors and medulloblastomas correlates with active Hedgehog signalling, loss of HDAC activity suppresses Hedgehog-dependent growth of neural progenitors and tumour cells. Consistent with this, abrogation of Gli1 acetylation enhances cellular proliferation and transformation. These data identify an integrated HDAC-and ubiquitin-mediated circuitry, where acetylation of Gli proteins functions as an unexpected key transcriptional checkpoint of Hedgehog signalling.
机构:Univ Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USA
Chun, Stephen G.
Zhou, Weiqiang
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机构:Univ Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USA
Zhou, Weiqiang
Yee, Nelson S.
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Univ Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USAUniv Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USA
机构:
Univ Sheffield, Sch Med & Biomed Sci, Ctr Dev Genet, Sheffield S10 2TN, S Yorkshire, EnglandUniv Sheffield, Sch Med & Biomed Sci, Ctr Dev Genet, Sheffield S10 2TN, S Yorkshire, England
机构:Univ Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USA
Chun, Stephen G.
Zhou, Weiqiang
论文数: 0引用数: 0
h-index: 0
机构:Univ Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USA
Zhou, Weiqiang
Yee, Nelson S.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USAUniv Iowa, Carver Coll Med, Ctr Comprehens Canc, Program Cell Signaling & Dev Pharmacol, Iowa City, IA 52242 USA
机构:
Univ Sheffield, Sch Med & Biomed Sci, Ctr Dev Genet, Sheffield S10 2TN, S Yorkshire, EnglandUniv Sheffield, Sch Med & Biomed Sci, Ctr Dev Genet, Sheffield S10 2TN, S Yorkshire, England