Abstract
Cyclin D1 elicits transcriptional effects through inactivation of the retinoblastoma protein and direct association with transcriptional regulators. The current work reveals a molecular relationship between cyclin D1/CDK4 kinase and protein arginine methyltransferase 5 (PRMT5), an enzyme associated with histone methylation and transcriptional repression. Primary tumors of a mouse lymphoma model exhibit increased PRMT5 methyltransferase activity and histone arginine methylation. Analyses demonstrate that MEP50, a PRMT5 coregulatory factor, is a CDK4 substrate, and phosphorylation increases PRMT5/MEP50 activity. Increased PRMT5 activity mediates key events associated with cyclin D1-dependent neoplastic growth, including CUL4 repression, CDT1 overexpression, and DNA rereplication. Importantly, human cancers harboring mutations in Fbx4, the cyclin D1 E3 ligase, exhibit nuclear cyclin D1 accumulation and increased PRMT5 activity.
Copyright © 2010 Elsevier Inc. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Adaptor Proteins, Signal Transducing / metabolism
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Animals
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Cell Cycle Proteins / metabolism
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Cell Line, Tumor
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Cell Nucleus / enzymology*
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Cell Proliferation
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Cell Survival
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Cell Transformation, Neoplastic / genetics
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Cell Transformation, Neoplastic / pathology
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Cullin Proteins / genetics
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Cullin Proteins / metabolism*
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Cyclin D1 / metabolism*
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Cyclin-Dependent Kinase 4 / metabolism*
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DNA Methylation
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DNA Replication
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Enzyme Activation
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F-Box Proteins / metabolism
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Gene Expression Regulation, Neoplastic
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Histones / metabolism
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Humans
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Lymphoma / enzymology
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Lymphoma / genetics
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Lymphoma / pathology
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Mice
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Neoplasms / enzymology*
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Neoplasms / genetics
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Neoplasms / pathology*
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Phosphorylation
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Promoter Regions, Genetic / genetics
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Protein Binding
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Protein Methyltransferases / metabolism*
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Protein Stability
Substances
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Adaptor Proteins, Signal Transducing
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CDT1 protein, human
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Cell Cycle Proteins
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Cullin Proteins
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F-Box Proteins
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Fbx4 protein, mouse
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Histones
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MEP50 protein, human
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Cyclin D1
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Protein Methyltransferases
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Cyclin-Dependent Kinase 4