bluuebunny/crossref_metadata_2025_split huggingface dataset:
19-nor Vitamin-D Analogs: A New Class of Potent Inhibitors of Proliferation and Inducers of Differentiation of Human Myeloid Leukemia Cell Lines
Authors: Asou Hiroya , Koike Michiaki , Elstner Elena , Cambell Moray , Le Jennifer , Uskokovic Milan R. , Kamada Nanao , Koeffler H. Phillip 
Published: October 2019

Abstract
We have studied the in vitro biological activities and mechanisms of action of 1,25-dihydroxyvitamin D3 (1,25D3) and nine potent 1,25D3 analogs on proliferation and differentiation of myeloid leukemia cell lines (HL-60, retinoic acid-resistant HL-60 [RA-res HL-60], NB4 and Kasumi-1). The common novel structural motiff for almost all the analogs included removal of C-19 (19-nor); each also had unsaturation of the side chain. All the compounds were potent; for example, the concentration of analogs producing a 50% clonal inhibition (ED50) ranged between 1 × 10−9 to 4 × 10−11 mol/L when using the HL-60 cell line. The most active compound [1,25(OH)2-16,23E-diene-26-trifluoro-19-nor-cholecalciferol (Ro 25-9716)] had an ED50 of 4 × 10−11mol/L; in contrast, the 1,25D3 produced an ED50of 10−9 mol/L with the HL-60 target cells. Ro 25-9716 (10−9 mol/L, 3 days) was a strong inducer of myeloid differentiation because it caused 92% of the HL-60 cells to express CD11b and 75% of these cells to reduce nitroblue tetrazolium (NBT). This compound (10−8 mol/L, 4 days) also caused HL-60 cells to arrest in the G1 phase of the cell cycle (88% cells in G1v 48% of the untreated control cells). The p27kip-1, a cyclin-dependent kinase inhibitor which is important in blocking the cell cycle, was induced more quickly and potently by Ro 25-9716 (10−7 mol/L, 0 to 5 days) than by 1,25D3, suggesting a possible mechanism by which these analogs inhibit proliferation of leukemic growth. The NB4 promyelocytic leukemia cells cultured with the Ro 25-9716 were also inhibited in their clonal proliferation (ED50, 5 × 10−11mol/L) and their expression of CD11b was enhanced (80% positive [10−9 mol/L, 4 days] v 27% untreated NB4 cells). Moreover, the combination of Ro 25-9716 (10−9mol/L) and all-trans retinoic acid (ATRA, 10−7 mol/L) induced 92% of the NB4 cells to reduce NBT, whereas only 26% of the cells became NBT positive after a similar exposure to the combination of 1,25D3 and ATRA. Surprisingly, Ro 25-9716 also inhibited the clonal growth of poorly differentiated leukemia cell lines (RA-res HL-60 [ED50, 4 × 10−9 mol/L] and Kasumi-1 [ED50, 5 × 10−10 mol/L]). For HL-60 cells, Ro 25-9716 markedly decreased the percent of the cells in S phase of the cell cycle and increased the expression of the cyclin-dependent kinase inhibitor, p27kip-1. In summary, 19-nor vitamin D3 compounds strongly induced differentiation and inhibited clonal proliferation of various myeloid leukemia cell lines, suggesting a therapeutic niche for their use in myeloid leukemia.
Rh-Deficiency of the Regulator Type Caused by Splicing Mutations in the Human RH50 Gene
Authors: Chérif-Zahar Baya , Matassi Giorgio , Raynal Virginie , Gane Pierre , Delaunay Jean , Arrizabalaga Beatrix , Cartron Jean-Pierre 
Published: October 2019

AbstractThe Rh polypeptides and the glycoproteins Rh50, CD47, LW, and glycophorin B, which interact in the red blood cell membrane to form a multisubunit complex, are lacking or are severely reduced in the Rh-deficiency syndrome. We previously reported that in several Rhnull patients the RH50 gene was altered at the coding sequence level, resulting in either a single amino acid substitution or the synthesis of a truncated polypeptide. In the present report, we have detected two mutations in the intronic region of the RH50 gene that identify a new molecular mechanism involved in Rh-deficiency. The first mutation affected the invariant G residue of the 3′ acceptor splice-site of intron 6, causing the skipping of the downstream exon and the premature termination of translation. The second mutation occurred at the first base of the 5′ donor splice-site of intron 1. Both these mutations were found in homozygote state. RNase protection assays demonstrated that the Rh50 mRNA level was strongly reduced or undetectable in the 3′ and 5′ splice mutants, respectively. The different mutations affecting the RH50 gene are indicative of an heterogeneous mutational pattern, which further supports the hypothesis that the lack of the Rh50 protein may prevent the assembly or transport of the Rh membrane complex to the red blood cell surface.
A Role for Transforming Growth Factor-β1 in the Increased Pneumonitis in Murine Allogeneic Bone Marrow Transplant Recipients With Graft-Versus-Host Disease After Pulmonary Herpes Simplex Virus Type 1 Infection
Authors: Adler Heiko , Beland Janice L. , Kozlow Wende , Del-Pan Nadia C. , Kobzik Lester , Rimm Ilonna J. 
Published: October 2019

AbstractTo gain further insights in the pathogenesis of herpesvirus pneumonia in allogeneic bone marrow transplant recipients, transplanted mice (B10.BR → CBA) with graft-versus-host disease (GVHD) and control mice (transplanted mice without GVHD and normal CBA mice) were infected intranasally with herpes simplex virus type 1 (HSV-1). When compared with infected control mice, infected allogeneic transplant recipients with GVHD showed increased periluminal mononuclear cell infiltrates. However, infected allogeneic transplant recipients with GVHD showed lower virus content in the lung tissue than infected control mice. High concentrations of transforming growth factor-beta 1 (TGF-β1) were detected in the bronchoalveolar lavage (BAL) fluid of mock-infected allogeneic transplant recipients with GVHD, which increased slightly after infection. Anti–TGF-β treatment of allogeneic transplant recipients with GVHD significantly decreased the histological evidence of pneumonitis at day 4 after HSV-1 infection. We conclude that allogeneic transplant recipients with GVHD have (1) increased pneumonia, (2) highly elevated levels of TGF-β1 in the BAL fluid, and (3) reduced pulmonary virus content after HSV-1 infection. Our data suggest that the newly recognized dysregulation of cytokine (TGF-β1) production may be more important than the viral load for the increased severity of HSV-1 pneumonia in allogeneic transplant recipients with GVHD.
Cyclical Neutropenia and Other Periodic Hematological Disorders: A Review of Mechanisms and Mathematical Models
Authors: Haurie Caroline , Dale David C. , Mackey Michael C. 
Published: October 2019

Abstract
Although all blood cells are derived from hematopoietic stem cells, the regulation of this production system is only partially understood. Negative feedback control mediated by erythropoietin and thrombopoietin regulates erythrocyte and platelet production, respectively, but the regulation of leukocyte levels is less well understood. The local regulatory mechanisms within the hematopoietic stem cells are also not well characterized at this point. Because of their dynamic character, cyclical neutropenia and other periodic hematological disorders offer a rare opportunity to more fully understand the nature of these regulatory processes. We review the salient clinical and laboratory features of cyclical neutropenia (and the less common disorders periodic chronic myelogenous leukemia, periodic auto-immune hemolytic anemia, polycythemia vera, aplastic anemia, and cyclical thrombocytopenia) and the insight into these diseases afforded by mathematical modeling. We argue that the available evidence indicates that the locus of the defect in most of these dynamic diseases is at the stem cell level (auto-immune hemolytic anemia and cyclical thrombocytopenia seem to be the exceptions). Abnormal responses to growth factors or accelerated cell loss through apoptosis may play an important role in the genesis of these disorders.
© 1998 by The American Society of Hematology.
Cell Cycle-Related Changes in Repopulating Capacity of Human Mobilized Peripheral Blood CD34+ Cells in Non-Obese Diabetic/Severe Combined Immune-Deficient Mice
Authors: Gothot André , van der Loo Johannes C.M. , Clapp D. Wade , Srour Edward F. 
Published: October 2019

AbstractMost primitive hematopoietic progenitor cells reside in vivo within the G0/G1 phase of the cell cycle. By simultaneous DNA/RNA staining it is possible to distinguish G0 and G1 states and to isolate cells in defined phases of the cell cycle. We report here the use of cell cycle fractionation to separate human mobilized peripheral blood (MPB) CD34+ cells capable of repopulating the bone marrow (BM) of non-obese diabetic/severe combined immune-deficient (NOD/SCID) mice. In freshly isolated MPB, repopulating cells were predominant within the G0 phase, because transplantation of CD34+cells residing in G0 (G0CD34+) resulted on average in a 16.6- ± 3.2-fold higher BM chimerism than infusion of equal numbers of CD34+ cells isolated in G1. We then investigated the effect of ex vivo cell cycle progression, in the absence of cell division, on engraftment capacity. Freshly isolated G0CD34+ cells were activated by interleukin-3 (IL-3), stem cell factor (SCF), and flt3-ligand (FL) for a 36-hour incubation period during which a fraction of cells progressed from G0 into G1 but did not complete a cell cycle. The repopulating capacity of stimulated cells was markedly diminished compared with that of unmanipulated G0CD34+ cells. Cells that remained in G0 during the 36-hour incubation period and those that traversed into G1 were sorted and assayed separately in NOD/SCID recipients. The repopulating ability of cells remaining in G0 was insignificantly reduced compared with that of unstimulated G0CD34+ cells. On the contrary, CD34+ cells traversing from G0 into G1 were largely depleted of repopulating capacity. Similar results were obtained when G0CD34+ cells were activated by the combination of thrombopoietin-SCF-FL. These studies provide direct evidence of the quiescent nature of cells capable of repopulating the BM of NOD/SCID mice. Furthermore, these data also demonstrate that G0-G1 progression in vitro is associated with a decrease in engraftment capacity.© 1998 by The American Society of Hematology.
Divergent Effects of Interleukin-4 and Interferon-γ on Macrophage-Derived Chemokine Production: An Amplification Circuit of Polarized T Helper 2 Responses
Authors: Bonecchi Raffaella , Sozzani Silvano , Stine Johnny T. , Luini Walter , D’Amico Giovanna , Allavena Paola , Chantry David , Mantovani Alberto 
Published: October 2019

AbstractMacrophage-derived chemokine (MDC) is a CC chemokine that recognizes the CCR4 receptor and is selective for T helper 2 (Th2) versus T helper 1 (Th1) cells. The present study was designed to investigate the effect of the prototypic Th2/Th1 cytokines, interleukin-4 (IL-4) and interferon-γ (IFN-γ), on the production of MDC by human monocytes. IL-4 and IL-13 caused a time-dependent (plateau at 24 hours) and concentration-dependent (EC50 2 and 10 ng/mL, respectively) increase of MDC mRNA levels in monocytes. Increased expression of MDC mRNA was associated with protein release in the supernatant. MDC expression and production induced by IL-4 and IL-13 were inhibited by IFN-γ. IFN-γ also suppressed the constitutive expression of MDC in mature macrophages and dendritic cells. These results delineate an amplification loop of polarized Th2 responses based on differential regulation of MDC production by IL-4 and IL-13 versus IFN-γ and on the selectivity of this chemokine for polarized Th2 cells.© 1998 by The American Society of Hematology.
Decreased Rejection and Improved Survival of First and Second Marrow Transplants for Severe Aplastic Anemia (A 26-Year Retrospective Analysis)
Authors: Stucki Anne , Leisenring Wendy , Sandmaier Brenda M. , Sanders Jean , Anasetti Claudio , Storb Rainer 
Published: October 2019

AbstractBetween 1970 and 1996, 333 patients with severe aplastic anemia underwent HLA-matched related marrow transplant after conditioning with cyclophosphamide (CY). Thirty-five percent of patients transplanted between 1970 and 1976 (group 1), 12% of those transplanted between 1977 and 1981 (group 2), and 9% of patients transplanted between 1982 and 1997 (group 3) had graft rejection. Graft rejection occurred later among group 3 patients (median, 180 days) than among those in groups 1 and 2 (medians, 28 and 47 days, respectively; P &lt; .001 group 3 v 2). In group 3, 92% of rejecting patients underwent a second transplant, compared with 78% and 77% in groups 1 and 2, respectively. Group 1 patients received various conditioning regimens before second transplant, whereas most patients of groups 2 and 3 received CY combined with antithymocyte globulin (ATG). Graft-versus-host disease (GVHD) prophylaxis after second transplant consisted of methotrexate (MTX) for all group 1 and 2 patients, whereas group 3 patients received MTX combined with cyclosporine (CSP). Over the three time periods studied, first graft rejection decreased from 35% to 9%, and the proportion of rejecting patients undergoing second transplants increased from 77% to 92%. The 10-year probability of survival after second transplants increased from 5% to 83%. Multivariate analysis showed MTX/CSP GVHD prophylaxis to be a significant factor accounting for the increase in patient survival after second transplant.© 1998 by The American Society of Hematology.
The Relationship Between Thiopurine Methyltransferase Activity and Genotype in Blasts From Patients With Acute Leukemia
Authors: Coulthard Sally A. , Howell Christopher , Robson Jill , Hall Andrew G. 
Published: October 2019

Abstract
The level of expression of the enzyme thiopurine methyltransferase (TPMT) is an important determinant of the metabolism of thiopurines used in the treatment of acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML). Studies in red blood cells (RBC) have shown that TPMT expression displays genetic polymorphism with 11% of individuals having intermediate and one in 300 undetectable levels. The genetic basis for this polymorphism has now been elucidated and polymerase chain reaction (PCR)-based assays described for the most common mutations accounting for reduced activity. In previous studies, genotype has been correlated with red blood cell activity. In this report, we describe the relationship between genotype and TPMT activity measured directly in the target of drug action, the leukemic cell. We have demonstrated that the TPMT activity in lymphoblasts from 38 children and adults found by PCR to be homozygotes (*1/*1) was significantly higher than that in the five heterozygotes (*1/*3) detected (median, 0.25 v 0.08, P &lt; .002, Mann-Whitney U). Similar results were obtained when results from children were analyzed separately. However, comparison of activity in blasts from AML and ALL showed a higher level in the former (0.35 v 0.22 nU/mg,P &lt; .002, n = 17, 35), suggesting that factors other than genotype may also influence expression.
© 1998 by The American Society of Hematology.
DNA Fiber Fluorescence In Situ Hybridization Analysis of Immunoglobulin Class Switching in B-Cell Neoplasia: Aberrant CH Gene Rearrangements in Follicle Center-Cell Lymphoma
Authors: Vaandrager Jan-Willem , Schuuring Ed , Kluin-Nelemans Hanneke C. , Dyer Martin J.S. , Raap Anton K. , Kluin Philip M. 
Published: October 2019

AbstractImmunoglobulin class switching usually involves deletion of part of the immunoglobulin CH region. By DNA fiber fluorescence in situ hybridization (FISH) with a barcode of probes covering the DH, JH, and CH genes, the configuration of the entire CH region can be visualized on single DNA molecules. Using this technique, we have studied class switching in three types of B-cell neoplasia, mantle-cell lymphoma (MCL), follicular lymphoma (FL) and hairy cell leukemia (HCL), representing B cells in, respectively, pregerminal center, germinal center, and postgerminal center stages of development. In MCL and FL, simultaneous detection of the t(11;14) and t(14;18) breakpoint with probes for the BCL-1 and BCL-2 loci, respectively, allowed differentiation between productive and nonproductive alleles. In none of 10 MCL cases was class switching detected. In 21 HCL, all nonimmunoglobulin M (IgM) cases had class-switch deletion consistent with the expressed isotype on at least one allele. In FL, however, a peculiar pattern of CH rearrangement was observed. In IgM expressing FL, the translocated alleles had switched in 11 of 13 cases, and the nontranslocated allele showed complex rearrangements downstream from the Cμ-Cδ genes in 9 of 13 cases. These downstream rearrangements may reflect tumor-specific deregulation of the class-switch machinery. All seven immunoglobulin G (IgG) expressing FL showed class switching on both alleles. Fiber FISH analysis also showed several polymorphisms. The most frequent one, present on 38% of all analyzed alleles, consisted of an extra Cγ gene or pseudogene in the 3′ cluster.© 1998 by The American Society of Hematology.
8Cl-cAMP Cytotoxicity in Both Steroid Sensitive and Insensitive Multiple Myeloma Cell Lines Is Mediated by 8Cl-Adenosine
Authors: Halgren Robert G. , Traynor Ann E. , Pillay Shafali , Zell Joann L. , Heller Kimberly F. , Krett Nancy L. , Rosen Steven T. 
Published: October 2019

AbstractWe have examined the cytotoxic effects of cyclic adenosine-3′,5′-monophosphate (cAMP) derivatives on multiple myeloma cells lines and determined that the 8-Chloro substituted derivative (8Cl-cAMP) is one of the most potent. We report here that 8Cl-cAMP is cytotoxic to both steroid sensitive and insensitive myeloma cells with a half maximal concentration of approximately 3 μmol/L. 8Cl-cAMP toxicity in myeloma cells is dependent on phosphodiesterase activity in the serum of cell culture medium. A metabolite of 8Cl-cAMP, 8-Chloro-adenosine (8Cl-AD), kills myeloma cells as effectively as 8Cl-cAMP. Adenosine deaminase (ADA) converts 8Cl-AD into 8Cl-inosine and abrogates the cytotoxic effects of 8Cl-cAMP, 8Cl-AMP, and 8Cl-AD, as does 5-(p-Nitrobenzyl)-6-Thio-Inosine (NBTI), an inhibitor of nucleoside uptake. These data suggest that 8Cl-cAMP must be converted to 8Cl-AD and that 8Cl-AD is the compound that enters the cell. Contrary to glucocorticoid-mediated cell death in myeloma cells, the pathway of 8Cl-AD–mediated cell death appears to be independent of interleukin-6 (IL-6) actions. Although the exact mode of action for this agent is currently unknown, its ability to kill steroid sensitive and insensitive multiple myeloma cells in an IL-6 independent fashion may offer exciting new therapeutic options.© 1998 by The American Society of Hematology.
Detection of Clonal Hodgkin and Reed-Sternberg Cells With Identical Somatically Mutated and Rearranged VH Genes in Different Biopsies in Relapsed Hodgkin’s Disease
Authors: Vockerodt Martina , Soares Marta , Kanzler Holger , Küppers Ralf , Kube Dieter , Hansmann Martin-Leo , Diehl Volker , Tesch Hans 
Published: October 2019

Abstract
Hodgkin’s disease (HD) represents a malignant lymphoma in which the putative malignant Hodgkin and Reed-Sternberg (H-RS) cells are rare and surrounded by abundant reactive cells. Single-cell analyses showed that H-RS cells regularly bear clonal Ig gene rearrangements. However, there is little information on the clinical evolution of HD in a given patient. In this study, we used the single-cell polymerase chain reaction (PCR) to identify H-RS cells with clonal Ig gene rearrangements in biopsy specimens of patients with relapsed HD. The obtained clonal variable region heavy-chain (VH) gene rearrangements were used to construct tumor-clone-specific oligonucleotides spanning the complementarity determining region (CDR) III and somatically mutated areas in the rearranged VHgene. A number of biopsies were obtained during a period of 3 years from two HD patients. H-RS cells with identical VHrearrangements were detected in two separate infiltrated lymph nodes from one patient with nodular sclerosis HD. In a second patient with mixed cellularity HD subtype, clonal VH rearrangements with identical sequences were detected in infiltrated spleen and two lymph node biopsies. Despite the high sensitivity of the PCR method used (one clonal cell in 105 mononuclear cells), residual H-RS cells were not found in peripheral blood, leukapheresis material, purified CD34+ stem cells or bone marrow. The results show that different specimens from relapsed patients suffering from classical HD carry the same clonotypic IgH rearrangements with identical somatic mutations, demonstrating the persistence and the dissemination of a clonal tumor cell population. Thus, PCR assays with CDRIII-specific probes derived from clonal H-RS cells are of clinical importance in monitoring the dissemination of HD and tumor progression and could be useful for analysis of minimal residual disease after autologous stem cell transplantation.
© 1998 by The American Society of Hematology.
Serum Transferrin Receptor and Transferrin Receptor-Ferritin Index Identify Healthy Subjects With Subclinical Iron Deficits
Authors: Suominen Pauli , Punnonen Kari , Rajamäki Allan , Irjala Kerttu 
Published: October 2019

AbstractDespite the established utility of serum transferrin receptor (sTfR), serum ferritin, and the sTfR/log ferritin ratio (TfR-F Index) in the diagnosis of iron deficiency (ID) anemia, the numeric values of these parameters, which are indicative of subclinical ID, remain to be clearly defined. In this study, 65 apparently healthy nonanemic adults (22 men and 43 women) were treated with 3 months of oral iron supplementation to evaluate its effect on parameters reflecting iron status and to determine the prevalence of subclinical iron deficiency in apparently healthy adults. Significant supplementation-induced changes were observed in sTfR, ferritin, and TfR-F Index values in women, whereas in men, none of the studied parameters showed any significant change. Iron-deficient erythropoiesis (IDE) was not observed in men, but was found in 17 women (40%). Although individuals with a compromised iron status may be represented in substantial numbers in conventional reference populations, they can be readily identified using sTfR, ferritin, and TfR-F Index determinations.© 1998 by The American Society of Hematology.
Abnormal Microsomal Detoxification Implicated in Fanconi Anemia Group C by Interaction of the FAC Protein With NADPH Cytochrome P450 Reductase
Authors: Kruyt Frank A.E. , Hoshino Taizo , Liu Johnson M. , Joseph Pius , Jaiswal Anil K. , Youssoufian Hagop 
Published: October 2019

AbstractThe FAC protein encoded by the Fanconi anemia (FA) complementation group C gene is thought to function in the cytoplasm at a step before DNA repair. Because FA cells are susceptible to mitomycin C, we considered the possibility that FAC might interact with enzymes involved in the bioreductive activation of this drug. Here we report that FAC binds to NADPH cytochrome-P450 reductase (RED), a microsomal membrane protein involved in electron transfer, in both transfected COS-1 and normal murine liver cells. FAC-RED interaction requires the amino-terminal region of FAC and the cytosolic, membrane-proximal domain of the reductase. The latter contains a known binding site for flavin mononucleotide (FMN). Addition of FMN to cytosolic lysates disrupts FAC-reductase complexes, while flavin dinucleotide, which binds to a distinct carboxy-terminal domain, fails to alter FAC-RED complexes at concentrations similar to FMN. FAC is also functionally coupled to this enzyme as its expression in COS-1 cells suppresses the ability of RED to reduce cytochrome c in the presence of NADPH. We propose that FAC plays a fundamental role in vivo by attenuating the activity of RED, thereby regulating a major detoxification pathway in mammalian cells.© 1998 by The American Society of Hematology.