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Because human CD34+ and murine Sca-1+ hematopoietic stem-progenitor cells (HSPCs) express platelet-binding sialomucin P-selectin (CD162) and integrin Mac-1 (CD11b-CD18) antigen, it was inferred that these cells might interact with platelets. As a result of this interaction, microparticles derived from platelets (PMPs) may transfer many platelet antigens(More)
Recently, we purified rare CXC chemokine receptor 4 expressing (CXCR4(+)) small stem cells (SCs) from the murine bone marrow (BM) that express markers characteristic for embryonic (E)SCs, epiblast (EP)SCs, and primordial germ cells (PGCs). We named these primitive cells very small embryonic-like (VSEL) SCs (VSELs). Our data indicate that VSELs are also(More)
BACKGROUND The functional status of a cell is expressed in its metabolic activity. We have applied stable isotope tracing methods to determine the differences in metabolic pathways in proliferating Rhabdomysarcoma cells (Rh30) and human primary myocytes in culture. Uniformly 13C-labeled glucose was used as a source molecule to follow the incorporation of(More)
Numerous growth factors, cytokines, and chemokines are secreted by human CD34 ϩ cells, myeloblasts, erythroblasts, and megakaryoblasts and regulate normal hematopoiesis in an autocrine/paracrine manner The aim of this study was to explore further the hypothesis that early stages of normal human hematopoiesis might be coregu-lated by autocrine/paracrine(More)
Complement cascade (CC) becomes activated and its cleavage fragments play a crucial role in the mobilization of hematopoietic stem/progenitor cells (HSPCs). Here, we sought to determine which major chemottractant present in peripheral blood (PB) is responsible for the egress of HSPCs from the BM. We noticed that normal and mobilized plasma strongly(More)
Recently, we identified in adult tissues a population of Oct4(+)SSEA-1(+)Sca-1(+)lin(-)CD45(-) very small embryonic-like stem cells (VSELs). First, to address recent controversies on Oct4 expression in cells isolated from adult organs, we show here evidence that Oct4 promoter in bone marrow (BM)-derived VSELs has an open chromatin structure and is actively(More)
Complement has recently been implicated in developmental pathways and noninflammatory processes. The expression of various complement components and receptors has been shown in a wide range of circulating myeloid and lymphoid cells, but their role in normal hematopoiesis and stem cell homing has not yet been investigated. We report that normal human CD34(+)(More)
OBJECTIVES This study sought to assess of the mobilization of nonhematopoietic very small embryonic-like stem cells (VSELs) in acute myocardial infarction (MI). BACKGROUND Acute MI induces mobilization of bone marrow stem cells. Recently, a rare population of VSELs, expressing markers of embryonic pluripotent stem cells (PSCs), was identified in adult(More)
We reported that complement cascade (CC) becomes activated in bone marrow (BM) during granulocyte colony stimulating factor (G-CSF) mobilization of hematopoietic stem/progenitor cells (HSPCs) and demonstrated that while the third CC component (C3)-deficient mice are easy mobilizers, the fifth CC component (C5)-deficient mice mobilize very poorly. To explain(More)
The mechanisms regulating the homing/mobilization of hematopoietic stem/progenitor cells (HSPCs) are not fully understood. In our previous studies we showed that the complement C3 activation peptide, C3a, sensitizes responses of HSPCs to stromal-derived factor 1 (SDF-1). In this study, mobilization was induced with granulocyte colony-stimulating factor(More)