Interactions of STAT5b-RARalpha, a novel acute promyelocytic leukemia fusion protein, with retinoic acid receptor and STAT3 signaling pathways.

Blood
Shuo Dong, David J Tweardy

Abstract

Signal transducer and activator of transcription (STAT) 5b-retinoic acid receptor (RAR) alpha is the fifth fusion protein identified in acute promyelocytic leukemia (APL). Initially described in a patient with all-trans retinoic acid (ATRA)-unresponsive disease, STAT5b-RARalpha resulted from an interstitial deletion on chromosome 17. To determine the molecular mechanisms of myeloid leukemogenesis and maturation arrest in STAT5b-RARalpha(+) APL and its unresponsiveness to ATRA, we examined the effect of STAT5b-RARalpha on the activity of myeloid transcription factors including RARalpha/retinoid X receptor (RXR) alpha, STAT3, and STAT5 as well as its molecular interactions with the nuclear receptor corepressor, SMRT, and nuclear receptor coactivator, TRAM-1. STAT5b-RARalpha bound to retinoic acid response elements (RAREs) both as a homodimer and as a heterodimer with RXRalpha and inhibited wild-type RARalpha/RXRalpha transactivation. Although STAT5b-RARalpha had no effect on ligand-induced STAT5b activation, it enhanced interleukin 6-induced STAT3-dependent reporter activity, an effect shared by other APL fusion proteins including promyelocytic leukemia-RARalpha and promyelocytic leukemia zinc finger (PLZF)-RARalpha. SMRT was rel...Continue Reading

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