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Mandava SwarnaCorresponding author Cytogenetic division, SRL Ltd., Mumbai, India.
Acute lymphoblastic leukemia (ALL) is a rapid form of leukemia characterized by clonal proliferation and accumulation of immature hematopoietic stem cells of the lymphoid lineage in the bone marrow as well as peripheral blood. Chromosomal aberrations identified in childhood ALL have an important role in disease diagnosis, prognosis and management. We present the results of hematologic, immunophenotypic, cytogenetic, FISH and Multiplex RT-PCR analysis of a 6-year-old boy diagnosed with B-cell precursor Acute Lymphoblastic Leukemia (BCP- ALL). In this study, we identified a novel chromosomal translocation t(10;15)(q22;q22) by cytogenetic and FISH analysis. To the best of our knowledge, this is the first report of this novel chromosomal translocation in this subset of ALL and has not yet been reported elsewhere. This rearrangement may include certain cancer associated tumor suppressor gene(s) or genes involved in apoptosis and transcription regulation, which on loss of normal function may lead to leukaemogenesis.
I.V. ChernikovCorresponding author Institute of Chemical Biology and Fundamental Medicine SB RAS.
Small interfering RNA (siRNA) based drugs for overcoming multiple drug resistance of hematological malignancies could solve the problem of poor response to the chemotherapy and hight relapse rate. The main factor that significantly limits biomedical application of siRNA is inefficient delivery to target cells and tissues. The attachment of siRNA to molecules, which enter into the cell by natural transport mechanisms, can improve cellular uptake of siRNA. In current study the carrier-free cellular uptake of siRNA containig cholesterol residues conjugated to the 5’-end of the sense strand via oligomethylene linker of various length (here and after Ch-siRNA) was explored. The data demonstrate that cholesterol residue increase the accumulation of siRNA in all tested cell lines and the primary cells. The efficiency of Ch-siRNA accumulation in K562 cells depends greatly on the leangth of the linker connecting cholesterol and siRNA: Ch-siRNAs with linker of 10 - 12 methylene units accumulate the most efficiently in this cells. It was found that Ch-siRNA effectively accumulates in MOLT-3 (acute lymphoblastic leukemia, ALL), HL-60 (acute myelogenous leukemia, AML), K562 (chronic myelogenous leukemia CML) and primary peripheral blood mononuclear cells (PBMC) from patient with non-Hodgkin lymphoma (NHL) or healthy donor resulting in near 100% of transfected cell when used at 1 mM concentration.