The effects of the Friend and Rauscher leukemia viruses on the marrow and spleen colony-forming unit compartments have been studied. It was found that the two viruses produced qualitatively similar but quantitatively different #{224}(ffectsrelative to each other. Comparison of the effects of the individual virus on spleen with those on the marrow also showed striking differences. In the spleen ...

Mitogenic stimulation in vitro of mouse T lymphocytes induces the production of the hematopoietic cytokines granulocyte-macrophage colony-stimulating factor and IL-3. The present experiments showed that simple crowding of murine spleen or lymph node cells was a sufficient inducing stimulus. Crowding did not have this consequence for thymus or marrow cells or spleen cells from nu/nu or Rag-1-/- ...

the objective of this study was to evaluate the effect of the sto feeder layer on prepubertal rhode island red rooster sscs culture and proliferation in vitro. testis cells from 30 prepubertal rhode island red chicken (4-8 weeks of age), were individually separated and cultivated in the presence of  bfgf and lif growth factors on four well plates with two treatments and three replicats and five...

Glucan, a potent reticuloendothelial stimulant, is a glucopyranose polysaccharide derived from zymosan. Because of glucan's potential as an immunotherapeutic agent, we performed studies in order to determine its effect on granulopoiesis and macrophage production in mice. One week after the i.p. injection of 4 mg of glucan, there was a tenfold increase in colony-forming cells in the spleen and a...

Burkholderia pseudomallei is the etiological agent of melioidosis, a potentially fatal disease occurring in man and animals. The aim of this study was to investigate the pathophysiological course of experimental melioidosis, and to identify the target organs, in an animal model. For this purpose SWISS mice were infected intraperitoneally with the virulent strain B. pseudomallei 6068. The bacter...

Highly purified murine granulocyte-macrophage progenitor cells (CFU-GM) were used as target cells to assess the possible direct effects of purified preparations of recombinant murine 7-intcrferon, prostaglandin E, recombinant human heavy chain (acidic) ferritin, and recombinant human tumor necrosis factor a (TNF-a) on progenitor cells in vitro. Target CFU-GM, with cloning efficiencies of up to ...

Superparamagnetic iron oxide nanoparticles are candidate contrast agents for magnetic resonance imaging and targeted drug delivery. Biodistribution and toxicity assessment are critical for the development of nanoparticle-based drugs, because of nanoparticle-enhanced biological reactivity. Here, we investigated the uptake, in vivo biodistribution, and in vitro and in vivo potential toxicity of m...

We attempted to define the conditions that promote growth of putative lymphoma stem cell colonies in vitro in a soft agar system. Growth was promoted by feeder layers containing medium conditioned by adherent spleen cells of mineral oil-primed BALB/c mice or by cells from a human B lymphocyte cell line (RPMI-1788). There were 65 patients with all histologic types of non-Hodgkin lymphoma studied...

The supernatant fluid of stimulated spleen cells (PHA-SCM) supported in vitro colony growth of murine marrow. In the absence of exogenous erythropoietin, it stimulated the growth of (1) myeloid colonies and (2) distinct mixed colonies containing erythroid cells, granulocytes, macrophages, and infrequently megakaryocytes in a setting structurally resembling biopsied marrow. The cells that form m...