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STEM CELLS IN CHRONIC MYELOGENOUS LEUKEMIA - 09/09/11

Doi : 10.1016/S0889-8588(05)70484-6 
Catherine M. Verfaillie, MD 1*

Resumen

Chronic myelogenous leukemia (CML) is a malignant disorder of the human hematopoietic stem cell95 characterized by the Philadelphia chromosome (Ph).195, 222 The disease manifests itself in the initial chronic phase by an abnormal expansion of myeloid, erythroid, and megakaryocytic progenitors in the marrow, which traffic abnormally and accumulate in the peripheral blood and extramedullary locations, such as the spleen.58, 137 In addition, myeloid precursors and mature granulocytic elements are massively increased in marrow and blood.90, 104 In some patients, increases in megakaryocytes and platelets are seen; however, the mature erythroid compartment is not expanded and the lymphoid compartment does not seem to be functionally affected. After 3 to 5 years, the disease transforms, leading to a myeloid blast crisis in approximately two thirds of patients and to a B-lymphoid and less frequently T-lymphoid blast crisis in the remaining patients.40 There is ample evidence that presumed normal, polyclonal hematopoiesis coexists with the malignant Ph+ clone.10, 61, 172, 183, 215, 265, 267, 291 The normal Ph clone progressively decreases in size when the disease advances. Even during the initial chronic phase, the growth of the normal hematopoietic progenitors and cells is inhibited, which leads to the detection of almost exclusively Ph+ progenitors even at diagnosis.

The Philadelphia chromosome is the result of a reciprocal translocation between chromosomes 9 and 22, resulting in the formation of a hybrid BCR-ABL gene on chromosome 2211, 16, 222 and the reciprocal ABL-BCR gene on chromosome 9.77, 177, 178 The BCR-ABL gene encodes for a fusion protein with elevated and disregulated tyrosine kinase activity. Several in vitro and in vivo studies demonstrate that presence of this oncoprotein is necessary and sufficient for transformation. BCR-ABL cDNA introduced in hematopoietic cell lines causes growth factor–independent growth in vitro and tumorigenicity in vivo.44, 64, 102, 249 Transplantation of murine stem cells transduced with BCR-ABL cDNA causes a CML-like syndrome.65, 66, 101 Even though the BCR-ABL fusion gene is probably one of the oncogenes that has been most extensively studied, it is still not completely clear how BCR-ABL causes the characteristic features of CML. This article discusses briefly the molecular consequences of the BCR-ABL fusion gene, which has been discussed at length elsewhere.1, 146, 234, 269 It then reviews the current evidence to support the notion that CML in its chronic phase is a clonal hematopoietic stem cell disease in which malignant hematopoietic stem and progenitor cells respond to “normal” external proliferation and differentiation stimuli, but in which such responses are altered owing to defects in the stem and progenitor cells as a result of the BCR-ABL oncogene.

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 Address reprint requests to Catherine M. Verfaillie, MD, Division of Hematology, Box 806 UMHC, 420 Delaware Street SE, Minneapolis, MN 55455


© 1997  W. B. Saunders Company. Publicado por Elsevier Masson SAS. Todos los derechos reservados.
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Vol 11 - N° 6

P. 1079-1114 - décembre 1997 Regresar al número
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