This is the first report on the JAK2 gene mutation in AML, and the data indicated that the JAK2 gene mutation may not only contribute to the development of chronic myeloid disorders, but also to some AMLs.
In 5 V617F+ patients who progressed to AML, we show that SNP-A can allow for the detection of two modes of transformation: leukemic blasts evolving from either a wild-type jak2 precursor carrying other acquired chromosomal defects, or from a V617F+ mutant progenitor characterized by UPD9p.
We previously showed that CD34⁺/CD38⁻ acute myelogenous leukemia (AML) cells, which contain leukemia stem cells, expressed a greater amount of the phosphorylated forms of JAK2 and STAT5 (p-JAK2 and p-STAT5) than their CD34⁺/CD38⁺ counterparts.
Somatic mutations in JAK2 are frequently found in myeloproliferative diseases, and gain-of-function JAK3 alleles have been identified in M7 acute myeloid leukemia (AML), but a role for JAK1 in AML has not been described.
JAK2(V617F) was identified in patients previously diagnosed with a myeloproliferative disorder or acute myeloid leukemia transformed from myeloproliferative disorder, whereas a wild-type genotype was identified in patients with reactive conditions or de novo acute myeloid leukemia.
We selected the six patients with myelodysplastic syndromes or AML because they carried acquired rearrangements on chromosome 4q24; we selected the five patients with myeloproliferative disorders because they carried a dominant clone in hematopoietic progenitor cells that was positive for the V617F mutation in the Janus kinase 2 (JAK2) gene.
We hypothesized that the JAK2V617F mutation might also be present in samples from patients with acute myeloid leukemia (AML), especially erythroleukemia (AML-M6) or megakaryoblastic leukemia (AML-M7), where it might mimic erythropoietin or thrombopoietin signaling.
In the test of blind screening of 223 samples (111 Ph- MPNs, 60 Ph+ chronic myeloid leukemia, and 52 acute myeloid leukemia), JAK2V617F mutations were found in 78 (70%) patients with MPNs, but in none with chronic and acute myeloid leukemia.
JAK2 variants were detected at a higher frequency in the MPN>AML cohort (15.3%) in comparison with the MPN (4.6%; P < .001) and AML cohorts (5.2%; P < .001).
The 20-yr lag phase between the polycythemia vera and the AML adds indirect evidence to the growing realization that the leukemic transformation in patients with MPN occurs from in a JAK2 wild-type stem cell.
We conclude that JAK2-V617F-positive MPD frequently yields JAK2-V617F-negative AML, and transformation of a common JAK2-V617F-negative ancestor represents a possible mechanism.
A prospective study of 338 patients with polycythemia vera: the impact of JAK2 (V617F) allele burden and leukocytosis on fibrotic or leukemic disease transformation and vascular complications.
This study highlights the therapeutic potential of JAK2/HDAC dual inhibitors in treating AML and IFIs and provides an efficient strategy for multitargeting drug discovery.
Additionally, <b>18e</b> showed an excellent bioavailability (<i>F</i> = 58%), a suitable half-life time (<i>T</i><sub>1/2</sub> = 4.1 h), a satisfactory metabolic stability, and a weak CYP3A4 inhibitory activity, suggesting that <b>18e</b> might be a potential drug candidate for JAK2-driven myeloproliferative neoplasms and FLT3-internal tandem duplication-driven acute myelogenous leukemia.
Phase 2 study of the JAK kinase inhibitor ruxolitinib in patients with refractory leukemias, including postmyeloproliferative neoplasm acute myeloid leukemia.
Proliferation and survival signaling from both Jak2-V617F and Lyn involving GSK3 and mTOR/p70S6K/4EBP1 in PVTL-1 cell line newly established from acute myeloid leukemia transformed from polycythemia vera.
Six genes (AKT1, RUNX1, LTB, SDC1, RUNX1T1, and JAK2) from the imbalanced regions have been reported to be involved in AML, whereas other 30 cancer genes, not previously reported in an AML context, were identified as imbalanced.