Abstract:
:Heterogeneity for 5'nucleotidase has been demonstrated in chronic lymphocytic leukemia [12]. The enzyme is not detectable in the lymphocytes from the majority of patients with this disorder, but normal and even supranormal levels are found in some cases [17]. In the present studies, the properties of this ecto-nucleotidase were investigated in unhomogenized lymphocytes isolated from the blood of normal subjects and patients with chronic lymphocytic leukemia. The activity was found to have a pH optimum of 8.0-8.5 and a preference of 5'ribo- over 5'deoxyribonucleotides. The enzyme was inactive towards 2',3'AMP. The Km for AMP showed a broad range from 19 to 210 microM in unhomogenized lymphocytes. An unexpected relationship was observed between sp. act. and this Km in that higher Km values were noted with cells from subjects with high lymphocyte 5'nucleotidase sp. act. and low Km values in lymphocyte preparations with low sp. act. When plasma membranes were prepared, a narrow range of low Km values unrelated to sp. act. was noted. The change in Km was not due to Pi concentration or nucleotide effects. The ecto-enzyme was inhibited by alpha, beta-methylene adenosine diphosphate, while cytosol phosphatase activity was not inhibited by this compound. Heat stability studies revealed a 45% loss in 5'nucleotidase activity after incubation for 20 min at 65 degrees C. A comparison of the substrate preference, Km values, effect of inhibitor and subcellular localization revealed no differences between the enzyme from patients with chronic lymphocytic leukemia and from normal subjects. This finding is consistent with the suggestion that the undetectable or supranormal levels observed in the lymphocytes of patients with this disorder stems from variations in the percentage of cells having 5'nucleotidase rather than changes in the enzyme proper.
journal_name
Leuk Resjournal_title
Leukemia researchauthors
Conklyn MJ,Silber Rdoi
10.1016/0145-2126(82)90026-1subject
Has Abstractpub_date
1982-01-01 00:00:00pages
203-10issue
2eissn
0145-2126issn
1873-5835journal_volume
6pub_type
杂志文章abstract::Hybrid (C56BL/6 x DBA) (BDF1; H-2b/H-2d) mice bearing the P815 leukemia (H-2d) were grafted with a (CBA x C57BL/6)F1 (CBF1; H-2k/H-2b) cell suspension, comprising bone marrow cells (BMC; 25 x 10(6)/mouse) and spleen cells (SC; 55 x 10(6)/mouse) on day-4, then treated with cyclophosphamide (200 mg/kg) on day-2 and fina...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/s0145-2126(97)00011-8
更新日期:1997-10-01 00:00:00
abstract:OBJECTIVES:Follicular lymphoma (FL) is generally considered an indolent disorder but a significant subset of patients shows a worse outcome. Aim of this study was to validate the FLIPI score in an independent series of follicular lymphoma patients and to correlate prognostic categories with the period of diagnosis and ...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2005.07.006
更新日期:2006-03-01 00:00:00
abstract::Angiogenesis is a complex process controlled by the balance of a large number of regulating factors, the pro- and anti-angiogenic factors. Dysregulation of angiogenesis occurs in various pathologies and is one of the hallmarks for cancer. Recent emphasis on the microenvironment's influence in chronic lymphocytic leuke...
journal_title:Leukemia research
pub_type: 杂志文章,评审
doi:10.1016/j.leukres.2012.05.021
更新日期:2012-10-01 00:00:00
abstract::We have analysed the configuration of immunoassociated genes and the karyotypes of 30 patients with acute myelocytic leukemia (AML) and 10 with chronic myelocytic leukemia in blast crisis (CML-BC). In AML, the frequencies of T-cell receptor (TcR) beta, gamma, and delta chain and immunoglobulin heavy and light chain ge...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(91)90070-a
更新日期:1991-01-01 00:00:00
abstract::T-cell leukemias were induced in adult BDF1 mice by a single i.v. injection of methylnitrosourea (MNU). Leukemogenesis was delayed by a single or repeated injections of hydrocortisone (HC) after MNU and also when HC was given one day before MNU. Enhancement of leukemogenesis was seen in experiments with 10 and 14 days...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(85)90143-2
更新日期:1985-01-01 00:00:00
abstract::Acute myeloid leukemia (AML) is a heterogeneous disease. Until recently, treatment for patients with AML was limited to induction chemotherapy with cytarabine and anthracycline or hypomethylating agents, and, in some instances, allogeneic hematopoietic stem cell transplant. With the recent approval of new therapies-i....
journal_title:Leukemia research
pub_type: 杂志文章,评审
doi:10.1016/j.leukres.2018.09.001
更新日期:2018-10-01 00:00:00
abstract::It has become routine practice to culture bone marrow and/or unstimulated peripheral blood for cytogenetic analysis due to associations of consistent chromosomal abnormalities within specific subgroups of leukemias. Unfortunately, two leukemias for which numerous chromosomal aberrations have been recorded, acute myelo...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(89)90085-4
更新日期:1989-01-01 00:00:00
abstract:BACKGROUND:Analyses suggest MDS patients with higher serum ferritin levels (SF) have inferior overall survival (OS), in one study across MDS subtypes. Multiple analyses suggest those with high SF receiving iron chelation therapy (ICT) have superior OS, but which MDS subtypes benefit from ICT remains undefined. METHODS...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2017.11.005
更新日期:2018-01-01 00:00:00
abstract::Reversal of drug resistance is of pivotal importance in order to improve the results of chemotherapy. Monitoring of such reversal is necessary in order to analyze the results of clinical trials. Nonetheless, the leukemia cell population to eradicate is the leukemia initiating cells characterized by a CD34+CD38- phenot...
journal_title:Leukemia research
pub_type: 评论,社论
doi:10.1016/j.leukres.2008.09.022
更新日期:2009-06-01 00:00:00
abstract::Chronic myelogenous leukemia (CML) and 25% of adult onset acute lymphoblastic leukemia (ALL) are associated with the expression of Bcr-Abl, a constitutively activated protein tyrosine kinase. Bcr-Abl associated leukemias are characterized by a high degree of chromosomal and genomic instability. It is unclear if the ph...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/s0145-2126(01)00181-3
更新日期:2002-11-01 00:00:00
abstract::The thymic stroma has long been implicated in AKR thymic leukaemia. In this study an extensive panel of monoclonal antibodies was used to investigate changes in the AKR thymic microenvironment, in parallel with thymocyte differentiation of normal (2 month), preleukaemic (5-7 month) and leukaemic (> 7 month) mice. We f...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(95)00102-6
更新日期:1996-10-01 00:00:00
abstract::Adenosine deaminase (ADA) and purine nucleoside phosphorylase (PNP) were measured in normal human and in malignant lymphoid cells. Thymocytes had high ADA activity (21.2 +/- 6.8 10(3) nM/h/mg) and low PNP activity (1.2 +/- 0.6), whereas T peripheral blood lymphocytes (PBL) had low ADA activity (1.20 +/- 0.22) and high...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(82)90027-3
更新日期:1982-01-01 00:00:00
abstract::Rhodamine 123 is transported by the transmembrane efflux pump P glycoprotein (Pgp). We used this fluorescent dye to study multidrug resistance (MDR) activity in normal and leukemic CD34+ cells. These immature cells had a high degree of MDR activity. Among leukemic cells, CD34+ leukemias had significantly higher MDR ac...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(93)90159-i
更新日期:1993-12-01 00:00:00
abstract::Assessment of treatment response in acute leukemia is routinely performed after therapy via bone marrow biopsy. We investigated the use of positron emission tomography (PET) for early assessment of treatment response in patients with acute myeloid leukemia (AML), using the proliferation marker 3'-deoxy-3'-[(18)F]fluor...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2010.06.010
更新日期:2011-03-01 00:00:00
abstract::In this report we evaluated the exact expression pattern of c-Kit on mobilized peripheral blood (PB) CD34+ cells. Using a monoclonal antibody against CD117 antigen (95C3), flow cytometric analysis revealed that approximately 25% of the mobilized PB CD34+ cells coexpress c-Kit. This cell fraction showed a considerable ...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/s0145-2126(98)00002-2
更新日期:1998-04-01 00:00:00
abstract::The amplified myeloma centrosome has been identified as a therapeutic target. The present study explored the expression and prognostic significance of the centrosome-associated protein PLK1 in myeloma and the effect of BI 2536, a potent and selective inhibitor of PLK1, on myeloma cells. High plasma cell expression of ...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2011.07.016
更新日期:2011-12-01 00:00:00
abstract::Methylenetetrahydrofolate reductase (MTHFR) is an enzyme involved in folate metabolism and DNA methylation. Studies on MTHFR polymorphism in leukemia have largely focused on the protective role of MTHFR polymorphism in acute lymphoblastic leukemia (ALL). We evaluated the C677T and A1298C polymorphisms using the TaqMan...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2006.10.016
更新日期:2007-09-01 00:00:00
abstract::We describe a 79-year-old man who had massive pleural effusion and a proliferation of prolymphocytic leukemia cells in the peripheral blood, bone marrow, and pleural effusion fluid. Immunophenotyping of leukemia cells revealed either CD3+CD4+CD8-CD25+ or CD3+CD4+CD8+CD25+. The antibody against human T-cell lymphotropi...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2006.02.029
更新日期:2007-03-01 00:00:00
abstract::In-vitro infection of normal human lymphocytes with HTLV-I (human T-cell lymphotropic retrovirus type I) has been carried out to study the target cell specificity and the kinetics of infection. Cord blood (CBL) and adult peripheral blood lymphocytes (PBL) have been co-cultivated with irradiated HTLV-I donor cells (MT2...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(86)90056-1
更新日期:1986-01-01 00:00:00
abstract::The continuous human promyeloid cell line HL60 may be induced to differentiate into neutrophils by the presence of 1.25% dimethylsulphoxide (DMSO) and related compounds [4]. When treated with 12-O-tetradecanoylphorbol-13-acetate (TPA), the cells exhibit may features characteristic of monocytes/macrophages [13]. In bot...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(82)90006-6
更新日期:1982-01-01 00:00:00
abstract::The aim of this study was to elucidate the pathologic sequence changes and associated clinical phenotypes in 9 new patients showing homozygosity for perforin gene among a total of 37 (24%) Turkish FHL families studied by linkage analysis. These 9 unrelated patients (5M/4F) were coming from consanguineous families and ...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2007.11.033
更新日期:2008-06-01 00:00:00
abstract::The incidence of B cell chronic lymphocytic leukemia (B-CLL) is lower in Asian countries, including India, when compared with Western countries. The bcl-2 gene rearrangement was restricted to the 5' region and seen in only one of the 20 Indian patients analyzed. The incidence remains similar to that reported from West...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(96)00036-7
更新日期:1996-09-01 00:00:00
abstract::Homeobox genes HOXA9 and MEIS1 are evolutionarily conserved transcription factors with essential roles in both hematopoiesis and leukemogenesis. They act as dominant cooperating oncoproteins that cause acute leukemias bearing MLL translocations and to a lesser extent T-cell acute lymphocytic leukemia (ALL) characteriz...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2015.04.012
更新日期:2015-08-01 00:00:00
abstract::Allogeneic stem cell transplantation is considered to be a curative treatment modality in patients with chronic myelogenous leukemia. However patients are at risk for relapse years after transplantation. Currently we present two patients who relapsed 16 and 24 years after allogeneic bone marrow transplantation, respec...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2009.03.010
更新日期:2009-09-01 00:00:00
abstract::The functional behavior of hematopoietic stem cell (HSC) and progenitors in chronic myelomonocytic leukemia (CMML) and on disease progression is little known. We performed cell proliferation, apoptosis, hematopoietic colony forming/replating and differentiation potential studies in the purified subpopulations of Lin(-...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2008.02.011
更新日期:2008-09-01 00:00:00
abstract::Multiple myeloma (MM) is an incurable plasma cell malignancy, which causes a significant morbidity due to organ damage and bone tissue destruction. In recent years, novel drugs have become available for MM therapy thanks to a more deepened knowledge of this disease's pathogenesis. The perspective of employing targeted...
journal_title:Leukemia research
pub_type: 杂志文章,评审
doi:10.1016/j.leukres.2012.10.016
更新日期:2013-02-01 00:00:00
abstract::A combination of monosomy 7 and translocation t(9;22) (q34;q11), rarely observed in acute lymphoblastic leukaemia (ALL), is here reported: a peculiarity of this case was that the "breakpoint cluster region" on chromosome 22 was not rearranged, as demonstrated by molecular analysis, and a new c-abl protein (p190) was f...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(87)90114-7
更新日期:1987-01-01 00:00:00
abstract::Chemosensitivity of purified AML blasts to daunomycin was examined under conditions of CSF stimulation and compared with clinical outcome of DNR combination chemotherapy. AML blasts from 16 patients were purified, incubated serum-free in the presence of optimal concentrations of a complete cocktail of IL-3, GM-CSF and...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(90)90166-7
更新日期:1990-01-01 00:00:00
abstract::Some peripheral blood clonogenic T-cells from patients with T-cell malignancies can generate colonies in methylcellulose in the absence of added growth factors or mitogen stimulation (T-CFCs). T-CFC from these patients were also able to form colonies in semi-solid media in the presence of added growth factors (T-CFCi)...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/0145-2126(84)90057-2
更新日期:1984-01-01 00:00:00
abstract::Adult T-cell leukemia (ATL) is an aggressive malignancy of peripheral T cells infected with human T-cell leukemia virus type 1 (HTLV-1). The prognosis of patients with aggressive ATL remains poor because ATL cells acquire resistance to conventional cytotoxic agents. Therefore, development of novel agents is urgently n...
journal_title:Leukemia research
pub_type: 杂志文章
doi:10.1016/j.leukres.2015.10.012
更新日期:2015-12-01 00:00:00