The spleen is a major site for extramedullary hematopoiesis and adult mouse and human spleens retain low numbers of hematopoietic stem cells (HSC). Hematopoiesis is however dependent on stromal microenvironments that provide appropriate molecular signals. Recent evidence now suggests that a distinct stromal cell type exists in the spleen which can function as a niche for hematopoiesis. This rev...

Hematopoiesis is a complex process that requires specific set of blood components to function properly. Blood diseases can result from imbalances or deficiencies in these components. The body has physiological sensors respond environmental changes by maintaining elemental homeostasis. A deficiency one micronutrient lead others. purpose this study was investigate the role and interaction copper,...

Recent studies have documented an increased risk of therapy-related myelodysplastic syndrome or acute myelogenous leukemia (t-MDS/AML) after autologous bone marrow transplant (ABMT) for non-Hodgkin's lymphoma (NHL). To develop methods to identify patients at risk for this complication, we have investigated the predictive value of clonal bone marrow (BM) hematopoiesis for the development of t-MD...

The model organism Danio rerio, also known as the zebrafish, is an excellent system for studying the developmental process of hematopoiesis. It is an ideal model for in vivo imaging, and it is useful for large-scale genetic screens. These have led to the discovery of previously unknown players in hematopoiesis, as well as helped our understanding of hematopoietic development. In this review, we...

Primitive hematopoiesis occurs in the yolk sac blood islands during vertebrate embryogenesis, where abundant phosphatidylcholines (PC) are available as important nutrients for the developing embryo. However, whether these phospholipids also generate developmental cues to promote hematopoiesis is largely unknown. Here, we show that lysophosphatidic acid (LPA), a signaling molecule derived from P...

Major contributions to research in hematopoiesis in invertebrate animals have come from studies in the fruit fly, Drosophila melanogaster, and the freshwater crayfish, Pacifastacus leniusculus. These animals lack oxygen-carrying erythrocytes and blood cells of the lymphoid lineage, which participate in adaptive immune defense, thus making them suitable model animals to study the regulation of b...

Fetal liver hematopoiesis in mice disappears approximately 2 weeks after birth; however, under experimental acute anemia extramedullary hematopoiesis occurs in the livers of adult mice. The hematopoietic foci in the liver during extramedullary hematopoiesis contain erythroblasts and macrophages. In this study, the extent of involvement of macrophages in the development and involutional process ...