Neutropenia frequently complicates infection due to human immunodeficiency virus (HIV). The etiology of neutropenia in this setting includes bone marrow infection or infiltration, myelosuppressive therapies, the presence of antibodies to HIV, and accelerated apoptosis. Protection against microbial invaders by neutrophils is further compromised by impaired chemotaxis and phagocytosis, production...

By using human bone marrow cells enriched for early progenitors by selective immunoadsorption and plated at low cell density (iO to iO cells/mL/9.6 cm2) in semisolid methylcellulose culture. we have analyzed the cooperative effects of human colony-stimulating factor 1 (CSF-1 ), granulocyte-macrophage-CSF (GM-CSF). interleukin-1 a (ILla). and gibbon as well as human recombinant IL-3 on the forma...

BACKGROUND Hemorrhagic shock (HS) is the major leading cause of death after trauma. Up to 50% of early deaths are due to massive hemorrhage. Excessive release of pro-inflammatory cytokine and hypercatecholamine induces hematopoietic progenitor cells (HPCs) apoptosis, leading to multiorgan failure and death. However, still, result remains elusive for hematopoietic stem cells (HSCs) behavior in t...

Oncostatin M (OM) is structurally and functionally related to a subclass of hematopoietic cytokines including leukemia-inhibitory factor (LIF), ciliary neurotrophic factor (CNTF), granulocyte colony-stimulating factor (G-CSF), and interleukin-6 (IL-6). Using human endothelial cells (HEC) as a model for cytokine regulation of hematopoietic growth factor expression, we tested OM as an inducer of ...

Stimulation of unfractionated or nonadherent human marrow cells in agar culture by pokeweed-mitogen-stimulated BALB/c mouse spleen cell conditioned medium (SCM) led, in most cultures, to the exclusive formation of eosinophil colonies. The culture system exhibited linearity of eosinophil colony formation with varying numbers of cells cultured, and the absolute numbers and size of SCM-stimulated ...

Five monoclonal antibodies that identify the My-i human granulocyte surface antigen were not reactive with other peripheral blood cells. These antibodies effected complement-dependent cytolysis of a large fraction of normal human marrow leukocytes. This My-i-positive marrow cell population consisted of morphologically identifiable granulocytic precursor cells. Colony-forming cells of the granulo-

We have studied the effects of recombinant human thrombopoietin (TPO; mpl ligand) on the proliferation of human primitive hematopoietic progenitors in vitro. CD34+ cells were enriched for cell-cycle-dormant primitive progenitors by separation on the basis of expression of c-kit and CD38. In the presence of varying combinations of TPO, Steel factor (SF), and interleukin-3 (IL-3), CD34+/c-kit(low...

In this study we examine the effects of retinoids on purified CD34+ human hematopoietic progenitor cells. All-trans retinoic acid inhibited granulocyte colony-stimulating factor (G-CSF)-induced proliferation of CD34+ cells in short-term liquid cultures in a dose-dependent fashion with maximal inhibition of 72% at a concentration of retinoic acid of 1 mumol/L. Although no significant effects wer...

To facilitate the direct study of progenitor cell biology, we have developed a simple and efficient procedure based upon negative selection by panning to purify large numbers of committed erythroid and myeloid progenitors from human fetal liver. The nonadherent, panned cells constitute a highly enriched population of progenitor cells, containing 30.4 +/- 13.1% erythrocyte burst forming units (B...

In the background section of their abstract, Woei-Cherng Shyu and associates state that because granulocyte colony-stimulating factor (G-CSF) has anti-inflammatory and neuroprotective properties and the capacity to mobilize stem cells, it has the potential to be used in treatment of stroke. However, there are limited data about the effects of G-CSF on hemostasis. It has been suggested that G-CS...