Are all APL screated equal? Background image removed due to copyright considerations.

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Acute Promyelocytic Leukemia

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Are all APL screated equal? Background image removed due to copyright considerations.

Background RARαtranslocations in acute promyelocyticleukemia (APL) Mouse models recapitulate the human phenotype Current treatments utilize retinoic acid (RA) to induce differentiation and arsenic trioxide to induce apoptosis Human patients have variable response to therapy

Retinoic acid (RA) and As2O3treatment in transgenic models of acute promyelocyticleukemia (APL) unravel the distinct nature of the leukemogenic process induced by the PML-RARαand PLZF-RARαoncoproteins EduaroM. Rego, Li-Zhen He, Raymond P. Warrell, Jr., Zhu-Gang Wang, and Pier Paolo Pandolfi Proc. Natl. Acad. Sci. USA97,

Fig. 1. Effects of treatment with As2O3, RA, or As2O3 + RA on the survival of leukemicTM PML-RAR[alpha] and PLZF-RAR[alpha] Rego,E. M., et al. "Retinoic Acid (RA) and As2O3 Treatment in Transgenic Models of Acute PromyelocyticLeukemia(APL) Unravel the Distinct Nature of the LeukemogenicProcess induced by the PML-RARalphaand PLZF-RARalphaOncoproteins." PNAS 97, no. 18 (August 29, 2000): Copyright 2000 National Academy of Sciences, U.S.A. Used with permission.

Questions remaining: What are the inherent differences/similarities between PML- RARαand PLZF-RARαat the molecular level? How/why does PLZF-RARαrespond differently to RA? Is expression of PLZF-RARαrequired for tumor maintenance?

What are the inherent differences between PML-RARaand PLZF-RARaat the molecular level? Gene expression analysis on random APLsfrom humans followed by identification of the fusion gene Correlate gene expression in PML- RARαvs. PLZF-RARαvs. normal myeloid cells Image removed due to copyright considerations.

Possible results: Common genetic pathways upregulated

How/why does PLZF-RARarespond differently to RA? Additional analysis of gene expression profiles generated in previous section. New gene expression analysis comparing cultured PML-RARα± RA and PLZF- RARα± RA.

Possible results: Inhibition of Hox signaling Image removed due to copyright considerations. *: HoxB3 inhibits differentiation →normal & PML do not express B3 *: HoxD4 promotes differentiation →PLZF does not express D4 or B4

Is expression of PLZF-RARarequired for tumor maintenance? Tetracycline-regulated transgenic expression

Possible results