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Plos One : Alterations in Bone and Erythropoiesis in Hemolytic Anemia ; Comparative Study in Bled, Phenylhydrazine- Treated and Plasmodium-infected Mice, Volume 7

By Combes, Valery

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Book Id: WPLBN0003933579
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Reproduction Date: 2015

Title: Plos One : Alterations in Bone and Erythropoiesis in Hemolytic Anemia ; Comparative Study in Bled, Phenylhydrazine- Treated and Plasmodium-infected Mice, Volume 7  
Author: Combes, Valery
Volume: Volume 7
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
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Publisher: Plos

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Combes, V. (n.d.). Plos One : Alterations in Bone and Erythropoiesis in Hemolytic Anemia ; Comparative Study in Bled, Phenylhydrazine- Treated and Plasmodium-infected Mice, Volume 7. Retrieved from http://worldebookfair.com/


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Description : Sustained erythropoiesis and concurrent bone marrow hyperplasia are proposed to be responsible for low bone mass density (BMD) in chronic hemolytic pathologies. As impaired erythropoiesis is also frequent in these conditions, we hypothesized that free heme may alter marrow and bone physiology in these disorders. Bone status and bone marrow erythropoiesis were studied in mice with hemolytic anemia (HA) induced by phenylhydrazine (PHZ) or Plasmodium infection and in bled mice. All treatments resulted in lower hemoglobin concentrations, enhanced erythropoiesis in the spleen and reticulocytosis. The anemia was severe in mice with acute hemolysis, which also had elevated levels of free heme and ROS. No major changes in cellularity and erythroid cell numbers occurred in the bone marrow of bled mice, which generated higher numbers of erythroid blast forming units (BFU-E) in response to erythropoietin. In contrast, low numbers of bone marrow erythroid precursors and BFU-E and low concentrations of bone remodelling markers were measured in mice with HA, which also had blunted osteoclastogenesis, in opposition to its enhancement in bled mice. The alterations in bone metabolism were accompanied by reduced trabecular bone volume, enhanced trabecular spacing and lower trabecular numbers in mice with HA. Taken together our data suggests that hemolysis exerts distinct effects to bleeding in the marrow and bone and may contribute to osteoporosis through a mechanism independent of the erythropoietic stress.

 

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