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Query: UMLS:C0023418 (leukemia)
 93,477 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Marrow stromal cells are important in normal myelopoiesis and support growth of leukemia/lymphoma (LL) cells in vitro. We have previously described the heterotypic adherence of a human B-lymphoblastic cell line (UTMB-460) to marrow stromal cells (MSC). We have extended these observations to a human T-lymphoblastic cell line (CEM) and characterized the heterotypic adherence of B- and T-lymphoblastic cell lines to human MSC. Electron microscopy demonstrated UTMB-460 cells were in very close apposition to the MSC, but no specific intercellular junctions were noted. Under the conditions employed, these MSC express extracellular fibronectin, collagen types I and IV, intracellular laminin, and vimentin, but no factor VIII-R antigen. In addition, the MSC had receptors for the lectin Ulex europaeus agglutinin I. UTMB-460 and CEM cells do not adhere to extracellular matrix (ECM) proteins secreted by the MSC, i.e., fibronectin, collagen types I, III, or IV, or laminin. Monoclonal antibodies (MoAbs) against CD11a, CD11b, CD18, and CD54 and a polyclonal anti-human fibronectin antibody do not inhibit attachment of either B- or T-lymphoblastic cells to MSC. Peptides GRGES and GRGDS did not inhibit adherence of UTMB-460 and CEM cells to MSC. In contrast, the anti-vascular cell adhesion molecule (VCAM)-1 MoAb (4b9) caused significant inhibition (p < 0.01) of the adherence of both UTMB-460 and CEM cells to normal human MSC monolayers. These data suggest: (1) that MSC to which lymphoblastic cells adhere are specialized mesenchymal cells; (2) that the membrane interactions between T- and B-lymphoblastic cells and MSC involve close apposition of cell membranes of MSC and the lymphoblastic cells; (3) that the heterotypic adherence between B- and T-lymphoblastic cell lines (UTMB-460 and CEM) and MSC does not involve the RGD recognition sequence of the integrin family, the B2 leukocyte integrins, CD44, LAM-1, or the ECM proteins examined; and (4) that VCAM-1 may at least be partially responsible for heterotypic adherence between human MSC and B- and T-lymphoblastic cells.
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PMID:Characterization of heterotypic adherence between transformed human lymphoblastic cells and marrow stromal cells: VCAM-1 is a ligand for one of the leukemia cell adhesion proteins. 128 95

Acquired factor VIII inhibitors are usually described in hemophilia A, although some cases have been documented in chronic inflammatory diseases and malignant tumors. We report here the first case of a factor VIII inhibitor appearing in the course of hairy cell leukemia. Interferon therapy over a 5 month period led to complete remission of leukemia with parallel disappearance of the acquired factor VIII inhibitor.
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PMID:Hairy cell leukemia and factor VIII inhibitor: a case report. 140 38

A variant strain of Rauscher leukemia virus (RLV-A) obtained from a transplantable murine monomyelocytic leukemia causes a disease characterized by frank anemia, wasting, hepatosplenomegaly and erythroblastosis. The involvement of platelets in this disease are reported here. The RLV-A induced a severe thrombocytopenia (25 percent of control level) at the terminal stage of disease. This thrombocytopenia was not associated with disseminated intravascular coagulopathy since the prothrombin times were always within normal limits. The partial thromboplastin time was elevated in the terminal stages of disease and was found to be associated with factor deficiencies, possibly owing to the presence of anti-factor antibodies, in the intrinsic coagulation pathway, especially factor VIII. Further, splenectomy did not abolish the thrombocytopenia, since splenectomized, virally infected animals also developed severe thrombocytopenia (29 percent of control levels). The ensuing splenomegaly during progression of disease was not the cause of the thrombocytopenia. A physiological response to the severe thrombocytopenia was the production of larger size platelets. At terminal stages of the disease, platelet volume increased to 4.2 mu 3 (normal is 3.0 mu 3). An increase in platelet volume was also observed in splenectomized, virally infected animals. Electron microscopy indicated that these circulating platelets contained c-type viral particles. Viral infection was associated with decreased life span of circulating platelets, as measured by 75Se-methionine at mid and terminal stages of the disease. Our results suggest that direct viral infection of platelets and/or megakaryocytes with subsequent cell lysis is a possible cause of the observed thrombocytopenia observed in RLVA-induced disease and may also occur in other retrovirally-induced diseases.
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PMID:Thrombocytopenia in a retrovirally-induced murine erythroleukemia. 145 28

A new monoclonal antibody, JC70, raised against a membrane preparation from a spleen affected by hairy cell leukaemia, recognises a membrane bound glycoprotein identical with that of the CD31 group of monoclonal antibodies. The antibody stains a fixation resistant epitope on endothelial cells in benign and malignant conditions in a wide variety of paraffin wax embedded tissue. JC70 stained malignant endothelial cells in 10 angiosarcomas with more consistency than monoclonal or polyclonal antibodies to factor VIII related antigen (FVIII-Rag). In four cases of Kaposi's sarcoma the antibody stained malignant endothelial cells but not spindle cells. It is concluded that antibody JC70 is of value for studying benign and malignant human vascular disorders in routinely processed tissue.
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PMID:JC70: a new monoclonal antibody that detects vascular endothelium associated antigen on routinely processed tissue sections. 221 67

A 70-year-old man, who had been diagnosed as primary myelofibrosis in 1987 at Tokyo Women's Medical School, was admitted to our hospital because of left hip-joint pain in May 1988. Physical examinations revealed marked hepatosplenomegaly and multiple reddish papules on the skin. The peripheral blood showed marked leukoerythroblastosis and severe anemia with poikilocytosis. Bone marrow aspirations were dry tap. Needle biopsy of iliac crest showed a diffuse fibrosis. Biopsy of the papules showed an extramedullary haematopoiesis. He was treated with low dose Ara-C for seven days. Although hepatosplenomegaly and skin papules were reduced, he died of pneumonia a month later. At autopsy, leukemic cells massively infiltrated into the multiple organs, including bone marrow. The cells were identified with megakaryoblast, as those were positive for factor VIII related antigen. As far as we know, this is the third case of primary myelofibrosis transformed into acute megakaryoblastic leukemia.
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PMID:[Primary myelofibrosis with extramedullary haematopoiesis of the skin transformed into acute megakaryoblastic leukemia]. 232 83

The availability of safe and effective preparations of human immune globulin that can be administered intravenously has revolutionized replacement therapy for patients suffering from hypogammaglobulinaemia. Of equal importance and greater interest, however, has been the recognition that super physiological doses of IgG can manipulate an abnormal immune system. Future prospects for the use of immunoglobulin preparations to supply specific antibodies includes the standardization of procedures, whereby patients with acute sepsis may receive antibiotics and immunoglobulin simultaneously. Already there is in vitro evidence that suggests that opsonized bacteria are more readily affected by aminoglycosides. It seems certain that gamma globulin will be used routinely in the management of patients with a number of immunomalignancies, such as chronic lymphatic leukaemia and multiple myeloma that feature hypogammaglobulinaemia, especially when chemotherapy is being administered. Control trials are underway to determine whether gamma globulin given intravenously to premature babies will satisfactorily correct their immuno-deficient state and improve their chances of survival. The immunomanipulative capacity of immunoglobulin is yet to be fully realized. Success in ideopathic thrombocytopenic purpura had led to a trial of gamma globulin in a number of autoimmune conditions. Success has been reported in myasthenia gravis, rheumatoid arthritis, diabetes, patients with circulating antibodies to factor VIII and Kawasaki's disease. The mechanism of action is unknown but almost certainly multifactorial. Two proven mechanisms that will be added to in the future, include blockade of the Fc receptors on cells of the reticulo-endothelial system and manipulation of immunoregulatory T cells by the presence of anti-idiotypic antibodies in the preparation.
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PMID:The clinical use of intravenous gammaglobulin. 244 Jul 43

The cytochemical features of blast cells were studied in 45 patients with blastic phase of chronic granulocytic leukaemia. Various degrees of Sudan black B positivity was characteristic of myeloblastic transformation (23 patients), while in the medullary blast cells of nine patients with myelomonocytic transformation the alpha-naphthyl-acetate esterase showed intensive activity. In two cases the demonstrability of beta-thromboglobulin and factor VIII-related antigen in blast cells showing otherwise PAS, acid phosphatase and alpha-naphthyl-acetate esterase activity referred to megakaryocytic transformation. In six patients with lymphoid blast crisis proliferation of the Sudan negative blast cells with different granular PAS, acid phosphatase and/or beta-glucuronidase positivity was demonstrated. In five cases the cytochemical findings of leukaemic cells indicated biphenotypic and mixed transformation, respectively.
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PMID:Cytochemical studies in the blastic transformation of chronic granulocytic leukaemia. 247 28

Glomerular visceral epithelial cells (GVEC) from normal human glomeruli were grown in tissue culture. Cell surface markers were studied by immunofluorescence microscopy using antibodies against lymphohaemopoietic differentiation antigens which are known to be present early (BA-1, OKB2, BA-2) and late (J5, anti CR1) in renal ontogenesis. Like foetal human glomerular epithelium, the cultured cells reacted with BA-1 and OKB2 (identifying an antigen expressed on B cells and polymorphonuclear leucocytes), and BA-2 (leukaemia-associated antigen), but were consistently negative for CR1 (C3b receptor); J5 which identifies the common acute lymphoblastic leukaemia antigen (CALLA) stained variably. Reactivity with antimyosin or anti factor VIII were absent. The cells produced an extracellular matrix containing laminin, type IV collagen, and fibronectin. This study supports the notion that GVEC undergo dedifferentiation as shown by the acquisition of lymphohaemopoietic differentiation antigens present early in renal ontogeny. In addition, the production of extracellular matrix constituents in vitro may be useful for the investigation of human glomerular basement membranes.
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PMID:Lymphohaemopoietic antigens of cultured human glomerular epithelial cells. 264 19

A murine cultured cell line (MKM-O) was established from a tumor of a BALB/C (nu/nu) mouse that had been subcutaneously inoculated with human hepatoma tissue fragments in the same location. The MKM-O cell line was proven to be of endothelial origin by morphological examinations and positive staining with fluorescein-labeled antibody against factor VIII antigen. MKM-O cells grown in vitro produced a colony-stimulating factor (CSF) and a leukemia cell-growth factor (LC-GF). CSF from MKM-O acted on both human and murine bone marrow-derived granulocytes and macrophage colony-forming units (CFU-GM). The activity of LC-GF on human leukemia cell lines (HL-60, HSB-2, CEM, DAUDI and K562) was demonstrated both in conditioned medium (CM) of MKM-O and of rat vascular endothelial cells. The CM of MKM-O also demonstrated a limited growth promoting activity against the mononuclear cells from human cord blood and improved their survival, suggesting that endothelial cells play an important role in the proliferation and differentiation of blood cells.
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PMID:Colony-stimulating factor and leukemia cell-growth factor produced by a murine endothelial cell line, MKM-O. 282 70

A morphometric analysis was performed on trephine biopsies of the bone marrow to identify atypical megakaryocyte proliferation following PAS staining and the immunohistological demonstration of factor VIII. This study includes nine patients with a megakaryoblastic crisis in chronic myeloid leukemia (CML), four with acute megakaryoblastic leukemia (AM) and three with myeloid dysplasia later evolving into overt acute leukemia. Comparison and statistical evaluation of the PAS reaction with anti-factor VIII staining reveals that the latter technique not only facilitates the recognition of immature and abnormal megakaryocytes, but leads to a significantly increased count for all megakaryocytic elements in the bone marrow. Thus our retrospective investigation of routinely processed and paraffin-embedded trephine biopsies shows that the diagnosis of a megakaryoblastic crisis in CML as well as AM may be easily established with the aid of the anti-factor VIII method. In all cases of megakaryoblastic proliferation in CML and AM, the appearance of blasts was associated with moderate to pronounced myelofibrosis which could be also determined by morphometry.
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PMID:The use of the anti-factor VIII method on trephine biopsies of the bone marrow for the identification of immature and atypical megakaryocytes in myeloproliferative diseases and allied disorders. A morphometric study. 289 11


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