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Haematopoiesis is the formation of blood cellular components. All cellular blood components During fetal development, since bones and thus the bone marrow develop later, the liver functions as the main haematopoetic organ. Therefore. hematopoyesis fetal pdf. Quote. Postby Just» Tue Aug 28, am. Looking for hematopoyesis fetal pdf. Will be grateful for any help! Top. EnglishEspañol한국어日本語DeutschPortuguêsFrançaisMagyarItaliano. Present. Create your own · Report. Hematopoyesis fetal y primitiva. LT.

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For example, under the influence of erythropoietin an erythrocyte-differentiation factorfetzl subpopulation of cells as defined by the levels of Sca-1 differentiated into erythrocytes at a sevenfold higher rate than the rest of the population. The pool of progenitors is heterogeneous and can be divided into two groups; long-term self-renewing HSC and only transiently self-renewing HSC, also called short-terms.

Megakaryocytopoiesis is haematopoiesis of megakaryocytes.

hematopoyesis fetal pdf

Blood ; 91 9: However, CD34 is also expressed on stromal cell progenitors and even on vascular endothelium. Mol Biol Cell ; 4: There are two main transcription factors.

It is also known that ppFAK directly associates with b subunit of integrins, and its tyrosine phosphorylation and kinase activity are upregulated by the binding of FN to integrins These changes fetao often be tracked by monitoring the presence of proteins on the surface of the cell. In stochastic theory, undifferentiated blood cells differentiate to specific cell types by randomness.

The extracellular matrix as a cell survival factor.

Each successive change moves the cell closer to the final cell type and further limits its potential to become a different cell type. The molecular and cellular biology of wound repair.


Granulopoiesis or granulocytopoiesis is haematopoiesis of granulocytes, except of mast cells which are granulocytes but with an extramedullar maturation.

J Histochem Cytochem ; Other factors, termed colony-stimulating factors CSFsspecifically stimulate the production hematopoyesjs committed cells. In other projects Wikimedia Commons. Early ontogeny of the human hematopoietic system.

In hematopoywsis cells, adhesion is an essential process in the control of growth and differentiation and, although hematopoietic progenitor cells can grow in suspension and therefore can bypass this requirement, they have a close association with their stromal extracellular matrix hematopoyesi, under physiological conditions, may regulate interactions with locally available growth factors.

Curr Opin Genet Dev ; 7: The microenvironment has been reported to influence survival, proliferation, and differentiation 20, Together, the monocyte and the lymphocytes comprise the agranulocytes, as opposed to the granulocytes basophil, neurtophil and eosinophil that are produced during granulopoiesis. Further analysis will be necessary to reveal the signal transduction pathway and structural basis of FN for promoting cell survival and growth.

For a decade now, the evidence is growing that HSC maturation follows a myeloid-based model instead of the ‘classical’ schoolbook dichotomy model. Transcription factors, normal myeloid development, and leukemia. When bone marrow develops, it eventually assumes the task of forming most of the blood cells for the entire organism.

Pediatric Clinics of North America. Human hematopoietic stem cell adhere hemaotpoyesis cytokines and matrix molecules.


Advances in Experimental Medicine and Biology. Detection of the antigens in formalin-fixed tissue specimens required antigen-demasking protocols prior to application of antibodies. Structural requirement for fibronectin activities of CS1 and cell-binding domains. Jivanakis 1 Department fetall Cytology. The CD34 protein is also expressed on vascular endothelium.

Overall, it appears that the regulation of haematopoiesis is the result of multiple processes involving cell-cell and cell-extracellular matrix interactions, the hematlpoyesis of specific growth factors and other cytokines, as well as intrinsic modulators of haematopoietic development.


Retrieved 3 February Watt F, Hogan B. Suppression of ICE and apoptosis in mammary epithelial cells by extracellular matrix. In some cases, the liver, thymus, and spleen may resume their haematopoietic function, if necessary.

Another level at which stochasticity may be important is in the process of apoptosis and self-renewal. Our study gives insight into mechanisms of augmentation of hepatic hematopoiesis with fibronectin expression during the second trimester of development. The hemaopoyesis of late stage erythroid cells to fibronectin has been well characterized and is believed to be critical for the terminal stages of erythroid differentiation.

Over the years, several models have been advanced proposing that haematopoietic lineage determination is driven extrinsically through growth factors, stroma or other external influences 13intrinsically as described in stochastic models 14,15or both 16, Immunohistochemical control for fibronectin is shown in figure 1; there is a strong reactivity with the stromal cells of the hepatic portal triads.

Hematopoyesis fetal y primitiva by Lalu Torrijos Sánchez on Prezi

Annual Review of Immunology. Immunoenzymatic labeling of monoclonal antibodies using immune complexes of alkaline phosphatase and monoclonal anti-alkaline phosphatase APAAP complexes. Growth Factors ; 9: Haschek and Rousseaux’s handbook of hemaopoyesis pathology Third ed.

Semin Cancer Biol ; 4 5: During the past few decades the phenotype of the hemopoietic progenitors has been analyzed in detail.