Mutual, reciprocal SDF-1/CXCR4 interactions between hematopoietic and bone marrow stromal cells regulate human stem cell migration and development in NOD/SCID chimeric mice

The role of chemokine activation of Rac GTPases in hematopoietic stem cell marrow homing, retention, and peripheral mobilization

Mechanisms of hematopoietic stem cell mobilization: When innate immunity assails the cells that make blood and bone

Meeting summary: International Symposium and Workshop on Hematopoietic Stem Cells V, University of Tübingen, Germany, September 16–18, 2004

CXCL12/CXCR4 Signaling Enhances Human PSC-Derived Hematopoietic ProgenitorFunction and Overcomes Early InVivo Transplantation Failure.

Getting blood from bone: An emerging understanding of the role that osteoblasts play in regulating hematopoietic stem cells within their niche

CD45 regulates homing and engraftment of immature normal and leukemic human cells in transplanted immunodeficient mice

Bidirectional interactions between bone metabolism and hematopoiesis

CXCL12 governs cellular motility, a process deregulated by hematopoietic stem cell oncogenes such as p210-BCR-ABL. A phosphoproteomics approach to the analysis of a hematopoietic progenitor cell line treated with CXCL12 and the Rac 1 and 2 inhibitor NSC23766 has been employed to objectively discover novel mechanisms for regulation of stem cells in normal and malignant hematopoiesis. The proteomic data sets identified new aspects of CXCL12-mediated signaling and novel features of stem cell regulation. We also identified a novel phosphorylation event in hematopoietic progenitor cells that correlated with motile response and governed by the chemotactic factor CXCL12. The novel phosphorylation site on PTPRC/CD45; a protein tyrosine phosphatase, was validated by raising an antibody to the site and also using a mass spectrometry absolute quantification strategy. Site directed mutagenesis and inhibitor studies demonstrated that this single phosphorylation site governs hematopoietic progenitor cell and lymphoid cell motility, lies downstream from Rac proteins and potentiates Src signaling. We have also demonstrated that PTPRC/CD45 is down-regulated in leukemogenic tyrosine kinase expressing cells. The use of discovery proteomics has enabled further understanding of the regulation of PTPRC/CD45 and its important role in cellular motility in progenitor cells.

Hematopoietic stem cell-specific GFP-expressing transgenic mice generated by genetic excision of a pan-hematopoietic reporter gene.

Understanding the role of the microenvironment during definitive hemopoietic development

Transcriptome Analysis Identifies Regulators of Hematopoietic Stem and Progenitor Cells

Terminal differentiation induction as DNA damage response in hematopoietic stem cells by GADD45A.

CD133 Identifies a Human Bone Marrow Stem/Progenitor Cell Sub-population With a Repertoire of Secreted Factors That Protect Against Stroke

Modeling human hematopoietic cell development from pluripotent stem cells

Human Placenta Is a Potent Hematopoietic Niche Containing Hematopoietic Stem and Progenitor Cells throughout Development