Abstract
In multiple myeloma (MM), an incurable B cell neoplasm, mutation or deletion of p53 is rarely detected at diagnosis. Using small-molecule inhibitors of MDM2, we provide evidence that miR-192, 194, and 215, which are downregulated in a subset of newly diagnosed MMs, can be transcriptionally activated by p53 and then modulate MDM2 expression. Furthermore, ectopic re-expression of these miRNAs in MM cells increases the therapeutic action of MDM2 inhibitors in vitro and in vivo by enhancing their p53-activating effects. In addition, miR-192 and 215 target the IGF pathway, preventing enhanced migration of plasma cells into bone marrow. The results suggest that these miRNAs are positive regulators of p53 and that their downregulation plays a key role in MM development.
| Original language | English |
|---|---|
| Pages (from-to) | 367-381 |
| Number of pages | 15 |
| Journal | Cancer Cell |
| Volume | 18 |
| Issue number | 4 |
| DOIs | |
| State | Published - 19 Oct 2010 |
Bibliographical note
Funding Information:We thank Kay Huebner for careful reading of the draft MS, Nicola Zanesi for helping with the animal procedures, Dorothee Wernicke for helpful scientific discussion, Michele Morara for statistical advice, Yuri Pekarsky for scientific advice, Guido Marcucci and Ramiro Garzon for scientific advice, and Sharon Palko for administrative support. We also thank Dr. Shaomeng Wang's laboratory for supplying MI-219 compound and Dr. Irene M. Ghobrial for providing MM1s GFP+/Luc+ cells. We are grateful for research support from the Ohio State University Targeted Investment in Excellence Award and the Kimmel Foundation award (F.P.).
