Digital PCR technology can thus be utilized to predict WT1/ABL1 expression level accurately and should thus be useful for diagnosis or the evaluation of drug efficiency in patients with leukemia.
Transformation by MLL-hDOT1L and MLL-AF10 results in upregulation of a number of leukemia-relevant genes, such as Hoxa9, concomitant with hypermethylation of H3-K79.
We have isolated, by drug selection, an anthracycline-resistant HL-60 cell line that, in comparison to parental drug sensitive cells, exhibits a multidrug resistant phenotype including diminished intracellular drug retention, cross-resistance to multiple cytotoxic drugs, increased expression of a monoclonal antibody C219-reactive 180 kDa P-glycoprotein detected by Western blot analysis as well as increased expression of MDR-1 mRNA as determined by Northern blot and solution hybridization/RNAse protection analyses.
In the current study, the temporal pattern of infiltration of a CD10- pre-B leukemia line (G2) in various murine tissues and the progression of the disease in the whole animal were monitored by quantifying human CD44 mRNA expression by the polymerase chain reaction (PCR).
Using hierarchical clustering analysis to compare acute myeloid leukemia genetic subgroups based on their similarity of septin expression changes, we found that MLL-SEPT2 and MLL-SEPT6 neoplasias cluster together apart from the remaining subgroups and that PML-RARA leukemia presents under-expression of most septin family genes.
None of the high-risk features predictive of poor treatment outcome in childhood ALL, such as older age, high white blood cell (WBC) count, organomegaly, T-lineage immunophenotype, ability of leukemic cells to cause overt leukemia in severe combined immunodeficient (SCID) mice, presence of MLL-AF4, and BCR-ABL fusion transcripts were associated with high levels of BCL-2 expression.
The fusion gene produces a chimeric transcription factor that suppresses the expression of AML1-target genes via the MTG8 part of the chimeric protein, which is thought to be the primary cause of leukemia.
In some cases, endogenous GM-CSF expression by transduced AML cells induced phenotypic changes consistent with the maturation of leukemia blasts into antigen-presenting cells.
Although alterations of gene expression and hematopoietic cell proliferation have been reported in the presence of AML1-ETO, its expression does not lead to the development of leukemia.
We found that SOCS5 was differentially expressed in primary T-ALL and its expression levels were lowered in HOXA-deregulated leukemia harboring KMT2A gene rearrangements.
The prosurvival protein BCL2 is uniformly expressed in chronic lymphocytic leukemia (CLL), and enables leukemia cell survival in the face of cytotoxic treatment and increasing genomic, metabolic, and oxidative stresses.
Over-expression of human TCL1, a known CLL oncogene in murine B-cells leads to the development of mature CD19+/CD5+/IgM+ clonal leukemia with a disease phenotype similar to that seen in human CLL.
Our findings identify the molecular basis for the autocrine TNFalpha activation of the GM-CSF gene in JMML and suggest potential novel and specific approaches for the treatment of this aggressive childhood leukemia.
Furthermore, apatinib also strongly reversed multidrug resistance (MDR) in K562/ADR cells, and the primary leukemia blasts overexpressing ABCB1 while showed no synergistic interactions with chemotherapeutic agents in MRP1-, MRP4-, MRP7- and LRP-overexpressing cells.
While expression of mutant Jak2 was necessary for leukemia induction, neither its continued expression nor enzymatic activity was required to maintain leukemia survival and rapid proliferation.
To define the role of Flt3 in AML with high Hoxa9/Meis1, we treated mice with Hoxa9/Meis1-induced AML with the Flt3 inhibitor AC220, used an Flt3-ligand (FL-/-) knockout model, and investigated whether overexpression of Flt3 could induce leukemia together with overexpression of Hoxa9.