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. 2000 Nov;83(9):1161–1167. doi: 10.1054/bjoc.2000.1435

Cell cycle regulators p27 and pRb in lymphomas – correlation with histology and proliferative activity

M Kiviniemi 1,2,3, I Sauroja 2,3, A Rajamäki 4, K Punnonen 5, K-O Söderström 6, E Salminen 7
PMCID: PMC2363578  PMID: 11027429

Abstract

The cell cycle is a complex event in which multiple regulator-proteins participate. The G 1/S checkpoint of the cell cycle is controlled by pRb protein, which functions in its hypophosphorylated form as a negative regulator of growth. p27 (Kip1), a member of CIP/KIP family of cyclin inhibitory proteins, participates in inhibition of forming complexes that allow pRb to phosphorylate and lead the cell into mitosis. The expression of these important cell cycle regulator proteins was studied in a total of 96 non-Hodgkin’s lymphoma (NHL) samples, which were classified according to the REAL classification. The expression of p27, pRb and the cell proliferation marker Ki-67 (MIB-1) was evaluated in lymphomas using immunohistochemistry. This study showed that there were coordinate changes in the expression of p27 and pRb in NHL. When compared to low-grade lymphomas, high-grade lymphomas showed significantly reduced expression of p27 and inversely pRb expression was increased (P < 0.001). Increase in expression of Ki-67 was parallel with pRb expression, and was mainly seen in cells that lacked p27 expression (P < 0.0001). This study suggests that changes in the control of the cell cycle closely relate to the pathobiology of NHL. © 2000 Cancer Research Campaign

Keywords: non-Hodgkin’s lymphoma, p27 (Kip1), pRb, Ki-67 (MIB-1)

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