Differential Gene Expression of p27Kip1 and Rb Knockout Pituitary Tumors Associated with Altered Growth and Angiogenesis
Open accessAbstract
Mice lacking the p27Kip1 Cdk inhibitor, like mice lacking Rb, develop pituitary tumors involving pars intermedia melanotrophs, yet p27(Kip1) tumors are genetically distinct from Rb derived tumors as they exhibit haploid insufficiency. We compared tumors from mice with p27( Kip1) constitutive and tissue specific null mutations to tumors arising in tissue specific Rb knockout mice with the aim of determining whether they are distinguished by quantitative or qualitative differences. The rate of p27Kip1 knockout tumor development was strongly influenced by strain background due to polygenic strain modifiers in the C57BL/6J versus 129S4 strains but, unlike a prior report of Rb mutants, this impacted tumor incidence but not the tumor spectrum. p27Kip1 tumors were oligoclonal or polyclonal based on studies of X-chromosomal inactivation of Dock11. In contrast, Rb null tissue developed monoclonal neoplasms even in the absence of a requirement for Rb mutant clonal selection. Rb null tumors exhibited a higher proliferation rate and developed ischemic necrosis associated with an aberrant vasculature. p27Kip1 null tumors maintained normal vascular density, through a tumor cell dependent mechanism, but were more often hemorrhagic. Gene expression profiles distinguished p27Kip1 from Rb null tumors including significant differences in expression of Rb and E2F signature genes. Rb null tumors expressed higher levels of VEGF which, in other systems, is associated with dilated vessels, ineffective perfusion and tissue hypoxia. Mouse models lacking p27Kip1 and Rb may help us better understand the pathophysiology of MEN syndromes, retinoblastoma and other cancers that disrupt these important cell cycle inhibitors.
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Pituitary tumours in Rb-mutant mice contain high VEGF levels.
“For example, pituitary tumours arising in Rb-mutant mice have high levels of VEGF131.”
From Cellular mechanisms of tumour suppression by the retinoblastoma gene (2008) · cites this paper as [131]
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Sorted by citations
Cellular mechanisms of tumour suppression by the retinoblastoma gene
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Cyclin D1 and cdk4 mediate development of neurologically destructive oligodendroglioma
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- Authors
- Chien, W.-M., Garrison, K., Caufield, E., Orthel, J., Dill, J., & Fero, M. L.
- Affiliations
- Fred Hutch Cancer Center (US)
- University of Washington (US)
- Venue
- Cell Cycle
- Publisher
- Informa UK Limited
- Published
- 2007-03-15
- Volume
- 6
- Issue
- 6
- Pages
- 750-757
- ISSN
- 1538-4101 (ISSN-L)
- 1551-4005
- PMC
- PMC2040307
- OpenAlex
- W2010214016
- Cited by
- 23
- References
- 45
- Citations by year
- 2025: 1 · 2024: 1 · 2022: 1 · 2021: 1 · 2017: 1 · 2016: 2 · 2015: 2 · 2014: 2 · 2013: 1
- FWCI
- 2.20
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Cell Cycle (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health (5k04ca001000-05)
- National Cancer Institute (R01CA100053, K08CA071464, K22CA087731, CA1000-53)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Pituitary Gland Disorders and Treatments
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Angiogenesis and VEGF in Cancer
- Keywords
- p27, retinoblastoma protein, pituitary tumors, melanotrophs, pars intermedia, tumor growth, angiogenesis, tumor vasculature, vascular endothelial growth factor, cell cycle inhibitors, tumor clonality, tumor gene expression profiles, multiple endocrine neoplasia, retinoblastoma
- MeSH terms
- Animals, Mice, Inbred C57BL, Neovascularization, Pathologic, Pituitary Neoplasms, Species Specificity, Gene Expression Regulation, Neoplastic, Retinoblastoma Protein, Mice, Knockout, Gene Expression Profiling, Cyclin-Dependent Kinase Inhibitor p27, Mice
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