Expression of cyclins, cyclin-dependent kinases and cyclin-dependent kinase inhibitors in oligodendrogliomas in humans.
Cyclins are regulatory proteins of the cell cycle which bind and activate kinases. In gliomas, contrary to many malignancies, cyclin D1 is rarely amplified, but together with other cyclins, it increases with anaplasia. In a series of 23 surgical biopsies of grade II and III oligodendroglioma, cyclin D1, E, A, B1, CDK4-6, CDK2, Cdc2 and p27/Kip.1 have been studied by immunohistochemistry and Western blot. Cyclin D1 and A increased with anaplasia, showing a linear correlation with MIB.1 labeling index and an inverse correlation with p27/Kip.1 expression. Cyclin E and B1 and kinases were almost only expressed in grade III tumors. Normal oligodendrocytes and microglia cells of the cortex and white matter showed a clear positivity for cyclin D1, but not for other cyclins or kinases.
Fiano
Valentina
V
Department of Neuroscience, University of Turin, Via Cherasco, 15, 10126 Turin, Italy.
Ghimenti
Chiara
C
Schiffer
Davide
D
D015153:Blotting, Western; D001932:Brain Neoplasms / Q000378:metabolism* / Q000473:pathology; D018797:Cell Cycle Proteins / Q000378:metabolism*; D050760:Cyclin-Dependent Kinase Inhibitor p27; D018844:Cyclin-Dependent Kinases / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D016213:Cyclins / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D009367:Neoplasm Staging; D009837:Oligodendroglioma / Q000378:metabolism* / Q000473:pathology; D025521:Tumor Suppressor Proteins / Q000378:metabolism*
D018797:Cell Cycle Proteins; D016213:Cyclins; D025521:Tumor Suppressor Proteins; D050760:Cyclin-Dependent Kinase Inhibitor p27; D018844:Cyclin-Dependent Kinases