Inactivation of Eed impedes MLL-AF9-mediated leukemogenesis through Cdkn2a-dependent and Cdkn2a-independent mechanisms in a murine model Journal Article
| Authors: | Danis, E.; Yamauchi, T.; Echanique, K.; Haladyna, J.; Kalkur, R.; Riedel, S.; Zhu, N.; Xie, H.; Bernt, K. M.; Orkin, S. H.; Armstrong, S. A.; Neff, T. |
| Article Title: | Inactivation of Eed impedes MLL-AF9-mediated leukemogenesis through Cdkn2a-dependent and Cdkn2a-independent mechanisms in a murine model |
| Abstract: | Polycomb repressive complex 2 (PRC2) is a chromatin regulator with central roles in development and cancer. The canonical function of PRC2 is the trimethylation of histone 3 on lysine residue 27. This epigenetic modification is associated with gene silencing. Both tumor suppressor and oncogenic functions have been reported for PRC2, depending on cellular context. In leukemia mediated by the leukemogenic fusion MLL-AF9, complete ablation of canonical PRC2 function by genetic inactivation of the core component embryonic ectoderm development (Eed) or by combined pharmacologic inhibition of the PRC2 methyltransferases EZH2 and EZH1 has a strong anti-leukemic effect, and this effect has been linked to de-repression of the PRC2 target locus Cdkn2a. We asked whether inactivation of Cdkn2a is sufficient to restore leukemic activity of Eed-inactivated MLL-AF9 leukemia cells, using combined genetic inactivation of Cdkn2a and Eed. We found that Cdkn2a inactivation partially rescues in vitro and in vivo growth of Eed-inactivated MLL-AF9 cells. However, the growth of Eed-null Cdkn2a-null MLL-AF9 cells in the absence of Cdkn2a remained severely compromised in vitro and in vivo, compared with that of their Eed-floxed Cdkn2a-null counterparts. RNA sequencing analysis revealed that several genes previously implicated in inefficient growth of MLL-AF9-transformed cells, including Gata2, Egr1, and Cdkn2b were de-repressed as a consequence of Eed inactivation. Furthermore, we found that direct binding targets of MLL fusion proteins are negatively enriched in Eed-inactivated Cdkn2a-null MLL-AF9-transformed cells. Our data indicate that interference with PRC2 function affects MLL-AF9-mediated leukemogenesis by both Cdkn2a-dependent and Cdkn2a-independent mechanisms. © 2015 ISEH - International Society for Experimental Hematology. |
| Keywords: | controlled study; nonhuman; protein function; animal cell; mouse; cell growth; animal experiment; animal model; protein binding; in vivo study; in vitro study; molecular mechanics; rna; hybrid protein; cell transformation; leukemogenesis; gene inactivation; cyclin dependent kinase inhibitor 2a; rna sequence; myeloid leukemia; cyclin dependent kinase inhibitor 2b; early growth response factor 1; embryonic ectoderm development protein; transcription factor gata 2; polycomb repressive complex 2; priority journal; article; myeloid leukemia cell line |
| Journal Title: | Experimental Hematology |
| Volume: | 43 |
| Issue: | 11 |
| ISSN: | 0301-472X |
| Publisher: | Elsevier Science, Inc. |
| Date Published: | 2015-11-01 |
| Start Page: | 930 |
| End Page: | 935.e6 |
| Language: | English |
| DOI: | 10.1016/j.exphem.2015.06.005 |
| PROVIDER: | scopus |
| PMCID: | PMC4630114 |
| PUBMED: | 26118502 |
| DOI/URL: | |
| Notes: | Export Date: 2 December 2015 -- Source: Scopus |
Altmetric
Citation Impact
BMJ Impact Analytics
Related MSK Work