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https://www.readbyqxmd.com/read/29668043/folate-deficiency-increases-chromosomal-damage-and-mutations-in-hematopoietic-cells-in-the-transgenic-mutamouse-model
#1
Danielle P LeBlanc, Nathalie A Behan, Jason M O'Brien, Francesco Marchetti, Amanda J MacFarlane
Folate deficiency causes megaloblastic anemia and neural tube defects, and is also associated with some cancers. In vitro, folate deficiency increases mutation frequency and genome instability, as well as exacerbates the mutagenic potential of known environmental mutagens. Conversely, it remains unclear whether or not elevated folic acid (FA) intakes are beneficial or detrimental to the induction of DNA mutations and by proxy human health. We used the MutaMouse transgenic model to examine the in vivo effects of FA deficient, control, and supplemented diets on somatic DNA mutant frequency (MF) and genome instability in hematopoietic cells...
April 18, 2018: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/29667853/evaluation-and-management-of-subchondral-calcium-phosphate-injection-technique-to-treat-bone-marrow-lesion
#2
Diego Costa Astur, Eduardo Vasconcelos de Freitas, Pedro Barreira Cabral, Caio Carvalho Morais, Bruno Silveira Pavei, Camila Cohen Kaleka, Pedro Debieux, Moises Cohen
Purpose This study aimed to compile available data in medical literature about subchondral calcium phosphate injection, comparing results obtained with this technique, as well as indications, complications, and other important factors in treatment of bone marrow lesions. Designs A literature review using PubMed and Medline database in order to identify works with terms "subchondral calcium phosphate injection," " subchondroplasty®," "bone marrow lesion," and "knee." Eight relevant articles were found...
April 1, 2018: Cartilage
https://www.readbyqxmd.com/read/29667765/molecular-profile-of-inflammatory-and-megakaryocytic-factors-in-pediatric-myelodysplastic-syndrome-with-acute-myelofibrosis
#3
Kais Hussein, Meinolf Suttorp, Angelika Stucki-Koch, Irith Baumann, Charlotte M Niemeyer, Hans Kreipe
Pediatric fibrotic myelodysplastic syndromes (ped-MDS-MF) and pediatric primary myelofibrosis (ped-PMF) are rare, and the molecular changes which mediate fibrosis have never been investigated. Histology and gene expression profile of 119 fibrosis/angiogenesis/inflammation/megakaryopoiesis-related factors in bone marrow biopsies were performed (two ped-MDS-MF and one ped-PMF). In one progressive ped-MDS, comparison of MF grade 0 (no myelofibrosis) and MF grade 2 (dense network of reticulin fibres) after 4 months showed that expression of fibrosis-related transcripts increased and dysplastic megakaryocytes formed a dense net of CD42b+ proplatelets...
April 18, 2018: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/29667269/effects-of-bmp-2-on-the-osteogenic-differentiation-of-bone-marrow-stem-cells-in-fibrous-dysplasia
#4
Soyoun Um, Hui Young Kim, Byoung-Moo Seo
OBJECTIVES: The purpose of this study was to evaluate the effects of BMP-2 on bone-grafting procedures for treatment of fibrous dysplasia based on in vitro and in vivo experiments. SUBJECTS AND METHODS: Proliferation of stem cells was determined by colony-forming assay, CCK-8 assay, and BrdU staining. OCT4 and NANOG expression was analyzed by flow cytometry and immunocytochemistry. Osteogenic differentiation was assessed by measuring ALP activity, alizarin red S staining, and in vivo transplantation...
April 18, 2018: Oral Diseases
https://www.readbyqxmd.com/read/29667156/how-we-manage-patients-with-plasmacytomas
#5
REVIEW
Despina Fotiou, Meletios A Dimopoulos, Efstathios Kastritis
PURPOSE OF REVIEW: To discuss the diagnostic approach, treatment options, and future considerations in the management of plasmacytomas, either solitary or in the context of overt multiple myeloma (MM). RECENT FINDINGS: Advanced imaging techniques such as whole-body magnetic resonance imaging and positron emission tomography/computerized tomography are essential for the diagnostic workup of solitary plasmacytomas (SP) to rule out the presence of other disease foci...
April 17, 2018: Current Hematologic Malignancy Reports
https://www.readbyqxmd.com/read/29667012/bone-marrow-adipocyte-developmental-origin-and-biology
#6
REVIEW
Joanna Bukowska, Trivia Frazier, Stanley Smith, Theodore Brown, Robert Bender, Michelle McCarthy, Xiying Wu, Bruce A Bunnell, Jeffrey M Gimble
PURPOSE OF REVIEW: This review explores how the relationships between bone marrow adipose tissue (BMAT) adipogenesis with advancing age, obesity, and/or bone diseases (osteopenia or osteoporosis) contribute to mechanisms underlying musculoskeletal pathophysiology. RECENT FINDINGS: Recent studies have re-defined adipose tissue as a dynamic, vital organ with functions extending beyond its historic identity restricted solely to that of an energy reservoir or sink. "State of the art" methodologies provide novel insights into the developmental origin, physiology, and function of different adipose tissue depots...
April 18, 2018: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/29666622/chemotactic-cues-for-notch1-dependent-leukemia
#7
REVIEW
Erich Piovan, Valeria Tosello, Alberto Amadori, Paola Zanovello
The NOTCH signaling pathway is a conserved signaling cascade that regulates many aspects of development and homeostasis in multiple organ systems. Aberrant activity of this signaling pathway is linked to the initiation and progression of several hematological malignancies, exemplified by T-cell acute lymphoblastic leukemia (T-ALL). Interestingly, frequent non-mutational activation of NOTCH1 signaling has recently been demonstrated in B-cell chronic lymphocytic leukemia (B-CLL), significantly extending the pathogenic significance of this pathway in B-CLL...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29666557/the-impact-of-delayed-sample-handling-and-type-of-anticoagulant-on-the-interpretation-of-dysplastic-signs-detected-by-flow-cytometry
#8
Bettina Kárai, Zsófia Miltényi, Lajos Gergely, Marianna Száraz-Széles, János Kappelmayer, Zsuzsanna Hevessy
Introduction: A growing body of evidence supports the usefulness of dysplastic signs detected by flow cytometry in the diagnosis of myelodysplastic syndromes (MDS). Our aim was to assess the impact of pre-analytical variables (delayed sample handling, type of anticoagulant, and different clones of antibody) in the interpretation of flow cytometric results. Material and methods: Bone marrow samples were labelled and analysed immediately after aspiration and on two consecutive days...
June 15, 2018: Biochemia Medica: časopis Hrvatskoga Društva Medicinskih Biokemičara
https://www.readbyqxmd.com/read/29666389/attenuated-dna-damage-responses-and-increased-apoptosis-characterize-human-hematopoietic-stem-cells-exposed-to-irradiation
#9
Shahar Biechonski, Leonid Olender, Adi Zipin-Roitman, Muhammad Yassin, Nasma Aqaqe, Victoria Marcu-Malina, Melanie Rall-Scharpf, Magan Trottier, M Stephen Meyn, Lisa Wiesmüller, Katia Beider, Yael Raz, Dan Grisaru, Arnon Nagler, Michael Milyavsky
Failure to precisely repair DNA damage in self-renewing Hematopoietic Stem and early Progenitor Cells (HSPCs) can disrupt normal hematopoiesis and promote leukemogenesis. Although HSPCs are widely considered a target of ionizing radiation (IR)-induced hematopoietic injury, definitive data regarding cell death, DNA repair, and genomic stability in these rare quiescent cells are scarce. We found that irradiated HSPCs, but not lineage-committed progenitors (CPs), undergo rapid ATM-dependent apoptosis, which is suppressed upon interaction with bone-marrow stroma cells...
April 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29666301/fratricide-of-nk-cells-in-daratumumab-therapy-for-multiple-myeloma-overcome-by-ex-vivo-expanded-autologous-nk-cells
#10
Yufeng Wang, Yibo Zhang, Tiffany Hughes, Jianying Zhang, Michael A Caligiuri, Don M Benson, Jianhua Yu
PURPOSE: Daratumumab and its use in combination with other agents is becoming a new standard of care for treatment of multiple myeloma (MM). We mechanistically studied how daratumumab acts on NK cells. EXPERIMENTAL DESIGN: Quantities of NK cells in peripheral blood (PB) and/or bone marrow (BM) of MM patients or healthy donors were examined by flow cytometry. NK cell apoptosis and the associated mechanism were assessed by flow cytometry and immunoblotting. Patients' NK cells were expanded in vitro using feeder cells...
April 17, 2018: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/29666250/developmentally-inspired-programming-of-adult-human-mesenchymal-stromal-cells-toward-stable-chondrogenesis
#11
Paola Occhetta, Sebastien Pigeot, Marco Rasponi, Boris Dasen, Arne Mehrkens, Thomas Ullrich, Ina Kramer, Sabine Guth-Gundel, Andrea Barbero, Ivan Martin
It is generally accepted that adult human bone marrow-derived mesenchymal stromal cells (hMSCs) are default committed toward osteogenesis. Even when induced to chondrogenesis, hMSCs typically form hypertrophic cartilage that undergoes endochondral ossification. Because embryonic mesenchyme is obviously competent to generate phenotypically stable cartilage, it is questioned whether there is a correspondence between mesenchymal progenitor compartments during development and in adulthood. Here we tested whether forcing specific early events of articular cartilage development can program hMSC fate toward stable chondrogenesis...
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29666160/most-human-introns-are-recognized-via-multiple-and-tissue-specific-branchpoints
#12
Jose Mario Bello Pineda, Robert K Bradley
Although branchpoint recognition is an essential component of intron excision during the RNA splicing process, the branchpoint itself is frequently assumed to be a basal, rather than regulatory, sequence feature. However, this assumption has not been systematically tested due to the technical difficulty of identifying branchpoints and quantifying their usage. Here, we analyzed ∼1.31 trillion reads from 17,164 RNA sequencing data sets to demonstrate that almost all human introns contain multiple branchpoints...
April 17, 2018: Genes & Development
https://www.readbyqxmd.com/read/29666118/a-simplified-scoring-system-in-de-novo-follicular-lymphoma-treated-initially-with-immunochemotherapy
#13
Emmanuel Bachy, Matthew J Maurer, Thomas M Habermann, Bénédicte Gelas-Dore, Delphine Maucort-Boulch, Jane A Estell, Eric Van den Neste, Réda Bouabdallah, Emmanuel Gyan, Andrew L Feldman, Joan Bargay, Alain Delmer, Susan L Slager, Maria Gomes da Silva, Olivier Fitoussi, David Belada, Hervé Maisonneuve, Tanin Intragumtornchai, Stephen M Ansell, Thierry Lamy, Peggy Dartigues, Brian K Link, John F Seymour, James R Cerhan, Gilles Salles
In follicular lymphoma (FL), no prognostic index has been built based solely on a cohort of patients treated with initial immunochemotherapy. There is currently a need to define parsimonious clinical models for trial stratification and to add on biomolecular factors. Here, we confirmed the validity of both the FLIPI and the FLIPI2 in the large prospective PRIMA trial cohort of 1,135 patients treated with initial R-chemotherapy +/- R maintenance. Furthermore, we developed a new prognostic tool comprising only 2 simple parameters (bone marrow involvement and β2-microglobulin (β2m)) to predict progression-free survival (PFS)...
April 17, 2018: Blood
https://www.readbyqxmd.com/read/29666112/increased-erythrophagocytosis-induces-ferroptosis-in-red-pulp-macrophages-in-a-mouse-model-of-transfusion
#14
Lyla A Youssef, Abdelhadi Rebbaa, Sergey Pampou, Stuart P Weisberg, Brent R Stockwell, Eldad A Hod, Steven L Spitalnik
Macrophages play important roles in recycling iron derived from the clearance of red blood cells (RBCs). They are also a critically important component of host defense, protecting against invading pathogens. However, the effects on macrophage biology of acutely ingesting large numbers of RBCs are not completely understood. To investigate this issue, we used a mouse model of RBC transfusion and clearance, which mimics the clinical setting. In this model, transfusions of refrigerator storage-damaged (i.e., "old") RBCs led to increased erythrophagocytosis by splenic red pulp macrophages (RPMs)...
April 17, 2018: Blood
https://www.readbyqxmd.com/read/29666084/multiple-myeloma-masquerading-as-diabetic-macular-oedema
#15
Kavitha Rao, Hemanth Murthy, N S Muralidhar, Padmaja Kumari Rani
A 58-year-old man, a known diabetic and hypertensive for 5 years was presented to us with a drop in reading vision in both eyes of 2 months duration. His best-corrected visual acuity was 6/24, N36 in both eyes. Fundus findings revealed moderate non-proliferative diabetic retinopathy with bilateral diffuse macular oedema. When conventional therapy with intravitreal ranibizumab did not alter the clinical picture, we looked into the differential diagnosis of bilateral persistent macular detachments and investigated further...
April 17, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29666081/mantle-cell-lymphoma-presenting-as-bilateral-adrenal-huge-masses
#16
Abtin Doroudinia, Mehrdad Bakhshayesh Karam, Mostafa Ranjbar, Arash Nikmanesh, Payam Mehrian
We present a middle-aged woman complaining of weakness, lethargy and weight loss for 6 months. Positron emission tomography (PET)/CT scan revealed huge bilateral adrenal masses with intense 18F-fluorodeoxyglucose avidity. Biopsy and immunohistochemical staining were compatible with mantle cell lymphoma (MCL). The patient received six cycles of rituximab, cyclophosphamide, doxorubicin, vincristine and prednisone (R-CHOP) followed by four cycles of intrathechal methotrexate chemotherapy. Bone marrow aspiration biopsy was performed for initial staging and also before bone marrow transplantation...
April 17, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29666070/gata4-dependent-differentiation-of-c-kit-derived-endothelial-cells-underlies-artefactual-cardiomyocyte-regeneration-in-the-heart
#17
Bryan D Maliken, Onur Kanisicak, Jason Karch, Hadi Khalil, Xing Fu, Justin G Boyer, Vikram Prasad, Yi Zheng, Jeffery D Molkentin
Background -While c-Kit+ adult progenitor cells were initially reported to produce new cardiomyocytes in the heart, recent genetic evidence suggests that such events are exceedingly rare. However, to determine if these rare events represent true de novo cardiomyocyte formation we deleted the necessary cardiogenic transcription factors Gata4 and Gata6 from c-Kit-expressing cardiac progenitor cells (CPCs). Methods - Kit allele-dependent lineage tracing and fusion analysis was performed in mice following simultaneous Gata4 and Gata6 cell-type specific deletion to examine rates of putative de novo cardiomyocyte formation from c-Kit+ cells...
April 17, 2018: Circulation
https://www.readbyqxmd.com/read/29666049/m1-and-m2-macrophages-differentially-regulate-hematopoietic-stem-cell-self-renewal-and-ex-vivo-expansion
#18
Yi Luo, Lijian Shao, Jianhui Chang, Wei Feng, Y Lucy Liu, Michele H Cottler-Fox, Peter D Emanuel, Martin Hauer-Jensen, Irwin D Bernstein, Lingbo Liu, Xing Chen, Jianfeng Zhou, Peter J Murray, Daohong Zhou
Uncovering the cellular and molecular mechanisms by which hematopoietic stem cell (HSC) self-renewal is regulated can lead to the development of new strategies for promoting ex vivo HSC expansion. Here, we report the discovery that alternative (M2)-polarized macrophages (M2-MΦs) promote, but classical (M1)-polarized macrophages (M1-MΦs) inhibit, the self-renewal and expansion of HSCs from mouse bone marrow (BM) in vitro. The opposite effects of M1-MΦs and M2-MΦs on mouse BM HSCs were attributed to their differential expression of nitric oxide synthase 2 (NOS2) and arginase 1 (Arg1), because genetic knockout of Nos2 and Arg1 or inhibition of these enzymes with a specific inhibitor abrogated the differential effects of M1-MΦs and M2-MΦs...
April 24, 2018: Blood Advances
https://www.readbyqxmd.com/read/29665934/-effect-of-regulating-ppar%C3%AE-by-mtor-signaling-on-adipogenesis-of-bone-marrow-mesenchymal-stem-cells-from-aplastic-anemia
#19
Fang Wei, Wei-Huan Zhang, Xiu-Lian Zhang, Xiao-Jing Ge, Shu-Qin Zhang
OBJECTIVE: To study the effect and mechanism of mTOR signaling on adipogenesis of bone marrow mesenchymal stem cells(BM-MSCs) from aplastic anemia (AA) patients through regulation of PPARγ. METHODS: BM-MSCs were isolated from 24 newly diagnosed AA patients and 24 healthy controls. The surface antigen expression of BM-MSCs was identified by flow cytometry. The capacity of adipogenic differentiation of BM-MSCs was determined by lipid droplets based on Oil Red O staining and by the expression of FABP4 based on Western blot...
April 2018: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/29665933/-effect-of-mir-99a-5p-on-the-differential-ability-of-human-bone-marrow-mesenchymal-stem-cells
#20
Hui Xu, Jian Wang, Xu Ye, Jing Ming, Su-Jun Li, Xiang Wang, Cai-Xia He, Xing-Bing Wang
OBJECTIVE: To investigate the effect of microRNA-99a-5p (miR-99a-5p) on differentiation ability of human bone marrow mesenchymal stem cells (BM-MSC). METHODS: BM-MSC was cultured and then transfected with miR-99a-5p mimics or inhibitors. The transfection efficiency was detected by real-time quantitative PCR. The effects of miR-99a-5p on the adipogenic and osteogenic differentiation ability of BM-MSC were detected by differentiation experiment. RESULTS: As compared with the negative control group, the expression of miR-99a-5p was significantly up-regulated after transfection with miR-99a-5p mimics(P<0...
April 2018: Zhongguo Shi Yan Xue Ye Xue za Zhi
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