PRAM-1 Is a Novel Adaptor Protein Regulated by Retinoic Acid (RA) and Promyelocytic Leukemia (PML)-RA Receptor α in Acute Promyelocytic Leukemia Cells

Christel Moog-Lutz, Erik J. Peterson, Pierre G. Lutz, Steve Eliason, Florence Cavé-Riant, Andrew Singer, Yolande Di Gioia, Sally Dmowski, Joanne Kamens, Yvon E. Cayre, Gary Koretzky

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

The t(15;17) translocation, found in 95% of acute promyelocytic leukemia, encodes a promyelocytic leukemia (PML)-retinoic acid receptor α (RARα) fusion protein. Complete remission of acute promyelocytic leukemia can be obtained by treating patients with all-trans retinoic acid, and PML-RARα plays a major role in mediating retinoic acid effects in leukemia cells. A main model proposed for acute promyelocytic leukemia is that PML-RARα exerts its oncogenic effects by repressing the expression of retinoic acid-inducible genes critical to myeloid differentiation. By applying subtraction cloning to acute promyelocytic leukemia cells, we identified a retinoic acid-induced gene, PRAM-1 (PML-RARα target gene encoding an Adaptor Molecule-1), which encodes a novel adaptor protein sharing structural homologies with the SLAP-130/fyb adaptor. PRAM-1 is expressed and regulated during normal human myelopoiesis. In U937 myeloid precursor cells, PRAM-1 expression is inhibited by expression of PML-RARα in the absence of ligand and de novo superinduced by retinoic acid. PRAM-1 associates with other adaptors, SLP-76 and SKAP-55HOM, in myeloid cell lines and with protein tyrosine kinase lyn. By providing the first evidence that PML-RARα dysregulates expression of an adaptor protein, our data open new insights into signaling events that are disrupted during transformation by PML-RARα and induced by retinoic acid during de novo differentiation of acute promyelocytic leukemia cells.

Original languageEnglish (US)
Pages (from-to)22375-22381
Number of pages7
JournalJournal of Biological Chemistry
Volume276
Issue number25
DOIs
StatePublished - Jun 22 2001

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