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Megakaryocyte - Encyclopedia, History, Geography and Biography Megakaryocytes account for less than 1% of bone marrow cells but can be 10 to 15 times larger than a typical red blood cell.(Compare to other cells) The nucleus of the megakaryocyte is very large and lobulated, which, under a light microscope, can give the false impression that there are several nuclei. Megakaryocyte function is determined by a large number of cytokines, including thrombopoietin. The developmental stages of the megakaryocyte is:CFU-Me (pluripotential hemopoietic stem cell or hemocytoblast) -> megakaryoblast -> promegakaryocyte -> megakaryocyte. www.arikah.com /encyclopedia/Megakaryocyte   (168 words)

Megakaryocyte - Biocrawler   (Site not responding. Last check: 2007-10-23) The megakaryocyte is a bone marrow cell responsible for the production of blood platelets when cytoplasm processes become fragmented. Megakaryocytes account for less than 1% of bone marrow cells but can be 10 to 15 times larger than a typical red blood cell.(Compare to other cells (http://wikibooks.org/wiki/Biology_Cell_biology_Introduction_Cell_size)) The nucleus of the megakaryocyte is very large and lobulated, which, under a light microscope, can give the false impression that there are several nuclei. You can find it there under the keyword Megakaryocyte (http://en.wikipedia.org/wiki/Megakaryocyte)The list of previous authors is available here: version history (http://en.wikipedia.org/w/index.php?title=Megakaryocyteandaction=history). www.biocrawler.com /encyclopedia/Megakaryocyte   (208 words)

Megakaryocyte   (Site not responding. Last check: 2007-10-23) Megakaryocytes account for less than 1% of bone marrow cells but can be 10 to 15 times larger than a typical red blood cell.( The developmental stages of the megakaryocyte is: CFU-Me (Stem cell or hemocytoblast) -> megakaryoblast -> promegakaryocyte -> megakaryocyte. It is licensed under the GNU free documentation license. www.ufaqs.com /wiki/en/me/Megakaryocyte.htm   (117 words)

Bone Marrow The study of myeloid or hematopoietic tissue is beyond the scope of this course and will be treated extensively in Hematology next year. You are required to know the structure and function of the megakaryocyte. The megakaryocyte fragments off parts of its cytoplasm to form the platelets that circulate in peripheral blood. www3.umdnj.edu /histsweb/lab5/lab5megakaryocyte.html   (229 words)

The biogenesis of platelets from megakaryocyte proplatelets -- Patel et al. 115 (12): 3348 -- Journal of Clinical ... Megakaryocytes increase their proplatelet number through formation of branched extensions off of existing proplatelets. for destruction of the nucleus in senescent megakaryocytes (55). in mature megakaryocytes as opposed to immature cells (57, 58). www.jci.org /cgi/content/full/115/12/3348   (4414 words)

Regulation of megakaryocyte ploidy in vivo in the rat -- Kuter and Rosenberg 75 (1): 74 -- Blood Regulation of megakaryocyte ploidy in vivo in the rat -- Kuter and Rosenberg 75 (1): 74 -- Blood transfusion, and the response of megakaryocytes was measured by flow megakaryocyte ploidy and whose level is inversely proportional to the www.bloodjournal.org /cgi/content/abstract/75/1/74   (310 words)

Megakaryocyte "Megakaryocyte" is a common misspelling or typo for: megakaryocytic. Megakaryocyte biology and precursors : In Vitro cloning and cellular properties : proceedings of the Symposium on Megakaryocytes In Vitro held at the Centers [i.e. "Megakaryocyte" is used about 2 times out of a sample of 100 million words spoken or written in English. www.websters-dictionary-online.org /definition/english/me/megakaryocyte.html   (332 words)

Megakaryocyte If you have a better definition for Megakaryocyte than the one presented here, please let us know by making use of the suggest a term option. This definition of Megakaryocyte may be disputed by other professionals. Our attempt is to provide easy definitions on Megakaryocyte and any other medical topic for the public at large. www.healthdictionary.info /Megakaryocyte.htm   (511 words)

Megakaryocyte   (Site not responding. Last check: 2007-10-23) Megakaryocyte function is determined by a large of cytokines including thrombopoietin. Megakaryocyte Biology and Precursors : In Vitro Cloning and Cellular Properties : Proceedings of the Symposium on Megakaryocytes In Vitro held at the Centers for Disease Control, Public Health Service, U.S. Department of Health and Human Services, Atlanta Megakaryocyte development and function: Proceedings of an international conference held at the Marine Biological Laboratory, Woods Hole, Massachusetts... www.freeglossary.com /Megakaryocyte   (310 words)

Megakaryocyte   (Site not responding. Last check: 2007-10-23) It isso called because on light microscopy it has many nuclei (karyo)and is exceptionally large (mega). Megakaryocyte function is determined by a large number of cytokines,including thrombopoietin. The developmental history of the megakaryocyte is: hemocytoblast -> megakaryocyte -> promegakaryocyte ->megakaryocyte www.therfcc.org /megakaryocyte-102802.html   (72 words)

Megakaryocyte synthesis is the source of epidermal growth factor in human platelets -- Ben-Ezra et al. 137 (4): 755 -- ... Megakaryocyte synthesis is the source of epidermal growth factor in human platelets -- Ben-Ezra et al. Megakaryocyte synthesis is the source of epidermal growth factor in human platelets the platelets from the megakaryocyte during thrombopoiesis, is unknown. ajp.amjpathol.org /cgi/content/abstract/137/4/755   (413 words)

John Libbey Eurotext : Éditions médicales et scientifiques France : revues, médicales, scientifiques, médecine, ... Biology of the platelet and megakaryocyte in vascular pathology The platelet megakaryocyte axis forms a dynamic equilibrium varying in normal biology and in disease. The importance of platelet reactivity in atherosclerosis and the evidence suggesting that prothrombotic changes in the megakaryocyte platelet haemostatic axis precede coronary artery thrombosis will be reviewed. www.john-libbey-eurotext.fr /en/revues/medecine/hma/e-docs/00/02/23/E9/resume.md?type=text.html   (174 words)

Scientists uncover novel role for estrogen in bone marrow Platelets circulate in the bloodstream to facilitate clotting and halt bleeding. A mature megakaryocyte extends long cytoplasmic processes (termed proplatelets) from its cell surface that, in one of the most dramatic morphological changes known to cell biologists, simultaneously fragments into thousands of new platelet cells. Further work demonstrated a crucial role for estradiol in proplatelet formation, as evidenced by their finding that the addition of exogenous estradiol increased proplatelt formation by more than %50, while the inhibition of estradiol receptors blocked proplatelet formation in live mice. www.innovations-report.de /html/berichte/biowissenschaften_chemie/bericht-23791.html   (512 words)

Thrombopoietin requires additional megakaryocyte-active cytokines for optimal ex vivo expansion of megakaryocyte ... Thrombopoietin requires additional megakaryocyte-active cytokines for optimal ex vivo expansion of megakaryocyte precursor cells.A moderate (approximately sevenfold) expansion of megakaryocyte progenitor cells (colony-forming unit-megakaryocyte) occurs in the presence of IL-1, -6, -11, S, and the addition of TPO to this cocktail yields an approximately 17-fold expansion. We conclude that early proliferative events in megakaryocyte development in vitro are regulated by multiple cytokines, and that TPO markedly affects these early developmental steps. However, by itself, TPO is neither necessary nor sufficient to generate a full proliferative/maturational in vitro response within the megakaryocyte compartment. www.ihop-net.org /UniPub/iHOP/gp/1456294.html   (283 words)

CVR | Research Groups | Platelet and Megakaryocyte Group   (Site not responding. Last check: 2007-10-23) Our data suggests the interaction of these two transcription factors is critical for the expression of megakaryocyte-specific proteins and, probably also for differentiation of megakaryocytes. The studies of gene regulation of megakaryocyte differentiation will result in a better understanding of the mechanisms involved in platelet production and may also lead to improved diagnosis and management of platelet disorders, including post-chemotherapy and radiotherapy-induced thrombocytopenia which is a serious complication of cancer treatment. Ex vivo expansion of megakaryocytic progenitor cells derived from normal human bone marrow cord blood. www.cvr.net.au /research/platelet.htm   (1033 words)

A novel cytokine exhibiting megakaryocyte potentiating activity from a human pancreatic tumor cell line HPC-Y5 -- ...   (Site not responding. Last check: 2007-10-23) A novel cytokine exhibiting megakaryocyte potentiating activity from a human pancreatic tumor cell line HPC-Y5 -- Yamaguchi et al. megakaryocyte potentiating factor (MPF) was purified from an HPC-Y5 conditioned medium by a combination of ion- exchange chromatography, gel Megakaryocyte Potentiation Factor Cleaved from Mesothelin Precursor Is a Useful Tumor Marker in the Serum of Patients with Mesothelioma www.jbc.org /cgi/content/abstract/269/2/805   (657 words)

Megakaryocyte Growth and Development Factor Is a Potent Growth Factor for Primitive Hematopoietic Progenitors in the ...   (Site not responding. Last check: 2007-10-23) Megakaryocyte Growth and Development Factor Is a Potent Growth Factor for Primitive Hematopoietic Progenitors in the Human Fetus -- MUENCH and BÁRCENA 55 (6): 1050 -- Pediatric Research Megakaryocyte Growth and Development Factor Is a Potent Growth Factor for Primitive Hematopoietic Progenitors in the Human Fetus Megakaryocyte growth and development factor (MGDF), or thrombopoietin, www.pedresearch.org /cgi/content/abstract/55/6/1050   (294 words)

Megakaryocyte Growth and Development Factor: A Review of Early Clinical Studies -- Abraham and Basser 2 (5): 311 -- The ... Megakaryocyte Growth and Development Factor: A Review of Early Clinical Studies -- Abraham and Basser 2 (5): 311 -- The Oncologist Megakaryocyte Growth and Development Factor: A Review of Early Clinical Studies Thrombopoietin • Megakaryocyte growth and development factor • Platelets • Chemotherapy • Progenitor cell mobilization • Toxicity • Thrombocytopenia • Mpl ligand • c-mpl • Clinical • Human • Phase 1 • Aggregation • Platelet function • Safety theoncologist.alphamedpress.org /cgi/content/abstract/2/5/311   (258 words)

Effects of hypoxia on megakaryocyte size and number of C3H and BALB/c mice -- McDonald et al. 199 (3): 287 -- ... Effects of hypoxia on megakaryocyte size and number of C3H and BALB/c mice -- McDonald et al. Effects of hypoxia on megakaryocyte size and number of C3H and BALB/c mice relationship between the size and number of megakaryocytes was found in www.ebmonline.org /cgi/content/abstract/199/3/287   (298 words)

Stem Cells Online -- Table of Contents Volume 8, Number 4, 1990 Megakaryocyte polyploidy as a grouped geometric distribution obeying the log-normal population law The effect of cytokines on the ploidy of megakaryocytes Analysis of megakaryocyte ploidy in patients with thrombocytosis stemcells.alphamedpress.org /content/vol8/issue4   (300 words)

Megakaryocytic leukemia - Webled.com   (Site not responding. Last check: 2007-10-23) New Treatment Strategies for Acute Megakaryocytic Leukemia are Needed [ Acute Megakaryocytic leukemia is a rare type of leukemia that occurs ]... [ Acute Megakaryocytic leukemia is characterized by excessive division ]... www.webled.com /Megakaryocytic%20leukemia.htm   (75 words)

Thrombopoietin antibodies Predicted to react with Mouse (75% identity with immunogen) and Rat (75% identity with immunogen) due to sequence homology. Predicted to react with Mouse (85% identity with immunogen), Rat (93% identity with immunogen) and Cow (93% identity with immunogen) due to sequence homology. C mpl ligand, Megakaryocyte colony stimulating factor, Megakaryocyte growth and... www.abcam.com /index.html?t=61671&pt=1&c=3284   (127 words)

Megakaryocyte   (Site not responding. Last check: 2007-10-23) Bid on auctions or use Buy it Now to purchase items from customer-rated sellers. For your convenience, we've gathered hundreds of Web Sites Offering information about "megakaryocyte" and ranked them according to relevancy. Granulocytes (Neutrophil, Eosinophil, Basophil) - Mast cell precursors - Monocytes (Histiocyte, Macrophages, Dendritic cells, Langerhans cells, Microglia, Kupffer cells) - Megakaryoblast - Megakaryocyte - Platelets sports.abcworld.net /Megakaryocyte.html   (200 words)

Megakaryocyte in Bone Marrow The megakaryocyte is the enormous purple-blue cell in this picture. When all the cytplasm is bone, the nucleus will be recycled. Although the books remind us that most megakaryocytes reside in the bone marrow, up to 25% live and work in the lungs instead. www.pathguy.com /~lulo/lulo0007.htm   (59 words)

NEJM -- Effects of Polyethylene Glycol-Conjugated Recombinant Human Megakaryocyte Growth and Development Factor on ... Axelrad, A. A., Eskinazi, D., Correa, P. N., Amato, D. Hypersensitivity of circulating progenitor cells to megakaryocyte growth and development factor (PEG-rHu MGDF) in essential thrombocythemia. SOLA, M. Pharmacokinetics, Pharmacodynamics, and Safety of Administering Pegylated Recombinant Megakaryocyte Growth and Development Factor to Newborn Rhesus Monkeys. Schiffer, C. A., Miller, K., Larson, R. A., Amrein, P. C., Antin, J. H., Zani, V. J., Stone, R. A double-blind, placebo-controlled trial of pegylated recombinant human megakaryocyte growth and development factor as an adjunct to induction and consolidation therapy for patients with acute myeloid leukemia. content.nejm.org /cgi/content/abstract/336/6/404   (1275 words)

Megakaryocyte - Standard of Care During differentiation the megakaryocyte progenitor switches from mitosis to endomitosis corresponding to DNA replication and leading to formation of a giant cell with a single polylobulated nucleus with a 2N ploidy. Ploidization increases megakaryocyte cytoplasm volume and increases the mass of platelets that arise from cytoplasm fragmentation. This page was last modified 00:00, 15 January 2001. www.standardofcare.com /mwiki/index.php?title=Megakaryocyte   (56 words)

Murine Megakaryocyte Progenitor Cells and Their Susceptibility to Suppression by G-CSF -- Metcalf et al. 23 (1): 55 -- ... Murine Megakaryocyte Progenitor Cells and Their Susceptibility to Suppression by G-CSF -- Metcalf et al. Murine Megakaryocyte Progenitor Cells and Their Susceptibility to Suppression by G-CSF of megakaryocyte colonies stimulated by thrombopoietin or IL-3. stemcells.alphamedpress.org /cgi/content/abstract/23/1/55   (200 words)

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