p27/kip1 expression in oligodendrogliomas and its possible prognostic role

p27/kip1 regulates the G1-S transition of the cell cycle by inhibiting cyclinD-CDK4, cyclinE-CDK2 and cyclinA-CDK2 complexes. Regulation of p27 levels occurs mainly post-translationally by ubiquitin-mediated proteasomal proteolysis. Although genetic changes of p27/kip1 are extremely rare, in many hu...

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Bibliographic Details
Published in:Acta neuropathologica 1999-12, Vol.98 (6), p.629-634
Main Authors: CAVALLA, P, PIVA, R, BORTOLOTTO, S, GROSSO, R, CANCELLI, I, CHIO, A, SCHIFFER, D
Format: Article
Language:English
Subjects:
2-Methylisoborneol
Biological and medical sciences
Brain cancer
Brain Neoplasms - genetics
Brain Neoplasms - pathology
Carcinoma
Cell cycle
Cyclin-dependent kinase 2
Cyclin-dependent kinase 4
Cyclin-dependent kinase inhibitor p27
Humans
Kip1 gene
Malignancy
Medical prognosis
Medical sciences
Microfilament Proteins - analysis
Microfilament Proteins - genetics
Multivariate analysis
Muscle Proteins
Neurology
Oligodendroglia - pathology
oligodendroglioma
Oligodendroglioma - genetics
Oligodendroglioma - pathology
p27 protein
Post-translation
Proteasomes
Proteolysis
Tumors of the nervous system. Phacomatoses
Ubiquitin
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Summary:p27/kip1 regulates the G1-S transition of the cell cycle by inhibiting cyclinD-CDK4, cyclinE-CDK2 and cyclinA-CDK2 complexes. Regulation of p27 levels occurs mainly post-translationally by ubiquitin-mediated proteasomal proteolysis. Although genetic changes of p27/kip1 are extremely rare, in many human carcinomas p27 levels are reduced, correlate with histological malignancy, and are associated with poor prognosis. In astrocytic gliomas, p27 decreases with anaplasia and is almost absent in glioblastomas. p27/kip1 was immunohistochemically studied in 37 oligodendrogliomas, categorized according to WHO classification. In this series, the immunohistochemical reaction for p27 was confined to nuclei. p27 score showed a tendency to decrease with malignancy. When the p27 score was considered as high versus low expression (cut-off of p27 labeling index, LI, at 25%), it represented an independent prognostic factor in univariate (P = 0.02) and in multivariate analysis (P = 0.04). The risk ratio suggested that the p27 low expression group had a threefold increased possibility to show a reduced survival. Moreover, p27 levels did not correlate with MIB-1 LI, suggesting that p27 is not merely associated with the control of proliferation.
ISSN:0001-6322
1432-0533
DOI:10.1007/s004010051128