Alteration of the Cyclin D1/p16-pRB Pathway,Cellular Proliferation and Apoptosis in Glioma
Abstract：Objective: To study the alteration of cyclin D1, p16 and pRB in glioma, analyze proliferation and apoptosis of tumor cells, and discuss the pathogenesis of glioma. Methods:Thirty-seven glioma specimens were classified as astrocytoma(25 cases, including 7 fibrillary cases; 6 protoplasmic cases; 12 anaplasfic cases), and glioblastoma( 12 cases,including 4 GBM cases). Ten normal brain tissues were taken as controls. The expression of cyclin D1, p16 and pRB were detected by immunohistochemical method. Cellular proliferation was assessed by Ki-67 label index(Ki-67 LI). Cellular apoptosis was detected by TUNEL and apoptotic indices(Al) was calculated. Results: The alterations of three proteins were cyclin D1 overexpression( 28/37,75.7% ), p16 and pRB deletion(20/37,54.1% and 12/37,32.4% ), which were closely related to tumor types, particularly in malignant glioma. Ki-67 LI and AI were higher when pRB pathway was abnormal. Apoptosis was minor in astrocytic tumors(astrocytomas,0.010 ± 0.002;glioblastomas,0.057 + 0.016). Conclusion: The abnormalities of cyclin D1/p16-pRB pathway correlated closely with pathogenesis of glioma.
Keywords：gliomacyclin Dlprolein pi6retinoblastoma proteincell cycleapoplosis
Publication Date：2004-05-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 149-153 )