Phenotypic alteration of bone marrow HSC and microenvironmental association in experimentally induced leukemia. 2010

Pratima Basak, and Sumanta Chatterjee, and Madhurima Das, and Prosun Das, and Jacintha Archana Pereira, and Ranjan Kumar Dutta, and Malay Chaklader, and Samaresh Chaudhuri, and Sujata Law
Stem Cell Research and Application Unit, Department of Biochemistry and Medical Biotechnology, Calcutta School of Tropical Medicine, Calcutta-700073, India.

Leukemia is a heterogeneous disorder of bone marrow (BM) failure syndrome where normal hematopoiesis gets altered due to transformation of either the normal hematopoietic cell or the hematopoietic microenvironment or both. Scientists have tried for decades to understand leukemia development in the context of therapeutic strategies. The existence of "leukemic stem cells" and their possible role in leukemogenesis have only recently been identified and it has changed the perspective with regard to new approaches for treating the disease. However the relationship between leukemic stem cells (LSCs) and leukemogenesis requires further investigation. In this present study, we have experimentally induced leukemia in mice by means of N-N' Ethylnitrosourea (ENU) to investigate the alterations in normal bone marrow cellular phenotype and associated changes in the stromal hematopoietic microenvironment under the event of leukemic disease progression. We have identified a significant decrease in the normal HSC phenotype in terms of Sca1 and c-kit receptor expression and subsequent sharp increase in certain leukemic cell specific receptor expression like CD123, CXCR4 and CD44 in the leukemic bone marrow. The decreased HSC receptor (Sca1 and c-kit) expression profile with concurrent increase in the expression of leukemic cell specific receptors (CD123, CXCR4, CD44) by the bone marrow cells of leukemic mice may account for the possible transformation of the normal hematopoietic cells that is necessary for the disease initiation and progression. Some of these receptors like CXCR4 and CD44 are also known to play an important role in maintaining leukemic cells and their complex crosstalk with the surrounding stromal microenvironment. Thus up-regulation in CXCR4 and CD44 receptor expression essentially pointed towards the stroma dependent surveillance of the leukemic bone marrow cells in leukemia. Leukemic bone marrow cells documented a rapid generation of stromal feeder layer in culture. The rapid stroma generation further supported the fact that leukemic stromal microenvironment gets altered in possible ways to support leukemic cell generation and fueling leukemogenesis. The study presented here, has tried to hint at exploring new therapeutic strategies by not only identifying the expression profile of cell surface receptors unique to cells involved in leukemic progression but also targeting the specific components of the stromal microenvironment that would facilitate therapeutic management of the disease.

UI MeSH Term Description Entries
D007938 Leukemia A progressive, malignant disease of the blood-forming organs, characterized by distorted proliferation and development of leukocytes and their precursors in the blood and bone marrow. Leukemias were originally termed acute or chronic based on life expectancy but now are classified according to cellular maturity. Acute leukemias consist of predominately immature cells; chronic leukemias are composed of more mature cells. (From The Merck Manual, 2006) Leucocythaemia,Leucocythemia,Leucocythaemias,Leucocythemias,Leukemias
D008565 Membrane Proteins Proteins which are found in membranes including cellular and intracellular membranes. They consist of two types, peripheral and integral proteins. They include most membrane-associated enzymes, antigenic proteins, transport proteins, and drug, hormone, and lectin receptors. Cell Membrane Protein,Cell Membrane Proteins,Cell Surface Protein,Cell Surface Proteins,Integral Membrane Proteins,Membrane-Associated Protein,Surface Protein,Surface Proteins,Integral Membrane Protein,Membrane Protein,Membrane-Associated Proteins,Membrane Associated Protein,Membrane Associated Proteins,Membrane Protein, Cell,Membrane Protein, Integral,Membrane Proteins, Integral,Protein, Cell Membrane,Protein, Cell Surface,Protein, Integral Membrane,Protein, Membrane,Protein, Membrane-Associated,Protein, Surface,Proteins, Cell Membrane,Proteins, Cell Surface,Proteins, Integral Membrane,Proteins, Membrane,Proteins, Membrane-Associated,Proteins, Surface,Surface Protein, Cell
D001853 Bone Marrow The soft tissue filling the cavities of bones. Bone marrow exists in two types, yellow and red. Yellow marrow is found in the large cavities of large bones and consists mostly of fat cells and a few primitive blood cells. Red marrow is a hematopoietic tissue and is the site of production of erythrocytes and granular leukocytes. Bone marrow is made up of a framework of connective tissue containing branching fibers with the frame being filled with marrow cells. Marrow,Red Marrow,Yellow Marrow,Marrow, Bone,Marrow, Red,Marrow, Yellow
D002471 Cell Transformation, Neoplastic Cell changes manifested by escape from control mechanisms, increased growth potential, alterations in the cell surface, karyotypic abnormalities, morphological and biochemical deviations from the norm, and other attributes conferring the ability to invade, metastasize, and kill. Neoplastic Transformation, Cell,Neoplastic Cell Transformation,Transformation, Neoplastic Cell,Tumorigenic Transformation,Cell Neoplastic Transformation,Cell Neoplastic Transformations,Cell Transformations, Neoplastic,Neoplastic Cell Transformations,Neoplastic Transformations, Cell,Transformation, Cell Neoplastic,Transformation, Tumorigenic,Transformations, Cell Neoplastic,Transformations, Neoplastic Cell,Transformations, Tumorigenic,Tumorigenic Transformations
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D005038 Ethylnitrosourea A nitrosourea compound with alkylating, carcinogenic, and mutagenic properties. Nitrosoethylurea,N-Ethyl-N-nitrosourea,N Ethyl N nitrosourea
D006412 Hematopoietic Stem Cells Progenitor cells from which all blood cells derived. They are found primarily in the bone marrow and also in small numbers in the peripheral blood. Colony-Forming Units, Hematopoietic,Progenitor Cells, Hematopoietic,Stem Cells, Hematopoietic,Hematopoietic Progenitor Cells,Cell, Hematopoietic Progenitor,Cell, Hematopoietic Stem,Cells, Hematopoietic Progenitor,Cells, Hematopoietic Stem,Colony Forming Units, Hematopoietic,Colony-Forming Unit, Hematopoietic,Hematopoietic Colony-Forming Unit,Hematopoietic Colony-Forming Units,Hematopoietic Progenitor Cell,Hematopoietic Stem Cell,Progenitor Cell, Hematopoietic,Stem Cell, Hematopoietic,Unit, Hematopoietic Colony-Forming,Units, Hematopoietic Colony-Forming
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D000950 Antigens, Ly A group of lymphocyte surface antigens located on mouse LYMPHOCYTES. Specific Ly antigens are useful markers for distinguishing subpopulations of lymphocytes. Ly Antigens
D014411 Neoplastic Stem Cells Highly proliferative, self-renewing, and colony-forming stem cells which give rise to NEOPLASMS. Cancer Stem Cells,Colony-Forming Units, Neoplastic,Stem Cells, Neoplastic,Tumor Stem Cells,Neoplastic Colony-Forming Units,Tumor Initiating Cells,Cancer Stem Cell,Cell, Cancer Stem,Cell, Neoplastic Stem,Cell, Tumor Initiating,Cell, Tumor Stem,Cells, Cancer Stem,Cells, Neoplastic Stem,Cells, Tumor Initiating,Cells, Tumor Stem,Colony Forming Units, Neoplastic,Colony-Forming Unit, Neoplastic,Initiating Cell, Tumor,Initiating Cells, Tumor,Neoplastic Colony Forming Units,Neoplastic Colony-Forming Unit,Neoplastic Stem Cell,Stem Cell, Cancer,Stem Cell, Neoplastic,Stem Cell, Tumor,Stem Cells, Cancer,Stem Cells, Tumor,Tumor Initiating Cell,Tumor Stem Cell,Unit, Neoplastic Colony-Forming,Units, Neoplastic Colony-Forming

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