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- W1991040544 abstract "Hodgkin's lymphoma (HL) is a B cell-derived lymphoma characterized by a minority of malignant Hodgkin Reed–Sternberg (HRS) cells that have lost their normal B cell phenotype. Alterations in the cell cycle and apoptosis pathways might contribute to their resistance to apoptosis and sustained cell cycle progression. A key player in both cell cycle arrest and apoptosis is CDKN1A, encoding p21 (p21). P21 is regulated by p53 and can function as a cell cycle inhibitor when in the nucleus or as an apoptosis inhibitor when localized in the cytoplasm. We observed expression of p53, p21 and p-p21 in a variable number of HRS cells in 24 of 40 cases. Expression of miR-17 and miR-106a was detected in HRS cells of 10 HL cases. MiR-17/106b seed family members, CDKN1A RNA and p21 protein levels were variable in HL cell lines. We showed effective targeting of the CDKN1A 3′ UTR by miR-17/106b in HL cell lines in a luciferase reporter assay and up-regulation of p21 protein levels upon anti-miR-17 treatment of KM-H2 cells. Functional studies indicated a p21-mediated G1 arrest after miR-17/106b down-regulation in KM-H2, whereas no G1 arrest was observed for U-HO1 and L428. This difference could not be explained by differences in the 3′ UTR, the cellular location of p21 or expression variation during cell cycle progression. A strong correlation was observed for the miR-17/106b:CDKN1A ratio and the responsiveness to miR-17 inhibition, ie a low ratio in KM-H2 and an extremely high ratio in the two unresponsive HL cell lines. In conclusion, we show that miR-17/106b regulates p21 protein levels in HL and that the effect of miR-17/106b-mediated inhibition depends on the miRNA : target gene ratio. Thus, in HL high miR-17/106b expression contributes to a dysfunctional p53 pathway and thereby also to the malignant phenotype. Copyright © 2011 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd." @default.
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- W1991040544 date "2011-09-26" @default.
- W1991040544 modified "2023-10-15" @default.
- W1991040544 title "MiR-17/106b seed family regulates p21 in Hodgkin's lymphoma" @default.
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- W1991040544 doi "https://doi.org/10.1002/path.2958" @default.
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