The transcription factor NF-E2 and the gene encoding PRV-1 are overexpressed in patients with? polycythemia vera (PV). The recent description of a Jak2V617F mutation in PV patients raises the question? whether this allele exerts its effect on the malignant clone in part through inducing NF-E2 expression. NF-E2? is a promising candidate in the pathophysiology of PV for several reasons:? NF-E2 is overexpressed in stem cells as well as in all three cell lineages affected in PV. In murine cells NFE2? overexpression leads to Epo-independent growth and differentiation. NF-E2 may thus play a pivotal role? in causing the erythrocytosis of PV. However, both the molecular mechanism leading to NF-E2? overexpression and its effect on human hematopoiesis are not known. In addition, the cause of PRV-1? overexpression remains unclear. Therefore, it is the aim of this project to investigate the cause of NF-E2? and PRV-1 overexpression in PV and the effect of NF-E2 overexpression in hematopoietic cells.? Based on the following hypotheses, the specific aims of this project are therefore:? 1. Hypothesis: NF-E2 is required for the Epo-independent growth of PV cells or its overexpression? modulates hematopoietic differentiation.
Specific Aim : To modulate NF-E2 expression via siRNA knock down? and retroviral or lentiviral transduction and examine the consequences on Epo-dependent and -independent? growth in vitro.? 2. Hypothesis: NF-E2 and PRV-1 overexpression in PV are mediated by the Jak2V617F allele Specific Aim:? To introduce Jak2 wt and V617F alleles in vivo and in vitro and examine the effects on NF-E2 and PRV-1? expression in various models.? 3. Hypothesis: NF-E2 and PRV-1 overexpression result from aberrant transcriptional activation Specific Aim:? To characterize protein/DNA interaction on the NF-E2 and PRV-1 promoters in PV and healthy control cells? to determine aberrantly activated transcription factors.? Public Health Implications: By leading to a better understanding of the molecular changes that lead to the? development of PV, this project will point out molecules against which new drugs for treatment can be? developed.
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