Search results for "Phagocyte"

Modificazioni indotte dal metilmercurio sugli emociti dell’ascidia Styela plicata

2011

Flow cytometric assay for quantifying opsonophagocytosis and killing of Staphylococcus aureus by peripheral blood leukocytes.

1992

We describe a novel flow cytometric method for quantifying opsonophagocytosis and killing of Staphylococcus aureus in cell-rich plasma obtained after dextran sedimentation of erythrocytes. To analyze opsonophagocytosis, phagocytes were labeled with a phycoerythrin-conjugated monoclonal antibody and were incubated with viable staphylococci containing carboxyfluorescein as a vital fluorescent dye. Phagocytosing cells assumed a dual, orange-green fluorescence. The relative numbers of bacteria associating with phagocytes could be determined by quantifying the decrease of free green fluorescent particles. A parallel incubation of fluorescent bacteria with unlabeled cell-rich plasma was performed…

[99mTc]Ca-Phytate: Some colloidal characteristics related to the optimal preparation conditions

1983

Abstract Some physico-chemical characteristics of the colloidal radiopharmaceutical [ 99 m Tc]Ca-phytate related to optimal preparation conditions have been studied. (1,2) It is demonstrated that the Ca 2+ -phytate stoichiometry is 6:1. Two different Ca-phytate colloids seem to be formed, mainly depending on the Ca 2+ :phytate molar ratio-one of low mycelar size for a 1:1 Ca 2+ :phytate molar ratio ( cmc ∗ = 5.10 −5 M ) , and another one, with a higher mycelar size for a 6:1 molar ratio (cmc = 8.10 −5 M). This last one it probably better for providing a good quality splenic uptake.

Signalling through TLR2/MyD88 induces differentiation of murine bone marrow stem and progenitor cells to functional phagocytes in response to Candida…

2009

Summary We have previously demonstrated that inactivated yeasts and hyphae of Candida albicans induce in vitro the proliferation of murine haematopoietic stem and progenitor cells (HSPCs, sorted as LKS cells: Lin - c-Kit + Sca-1 + ) as well as their differentia- tion to lineage-positive cells, through a MyD88- dependent pathway. In this work, we have found that this process is mainly mediated by TLR2, and that expanding cells express myeloid and not lym- phoid markers. Incubation of long-term repopulat- ing HSCs (Lin - CD105 + and Sca-1 + ) with C. albicans yeasts resulted in their proliferation and up regu- lation of the common myeloid progenitors (CMPs) markers, CD34 and FcgRII/III, by a …

The STATe of the Neuron Leads to Synaptic Stripping

2018

In a recent issue of Cell, Di Liberto et al. (2018) elucidate the mechanisms involved in synaptic stripping during viral infection. Infected neurons orchestrate their own synaptic loss downstream of IFNγ signaling, ultimately attracting phagocytic monocytes into the CNS through CCL2 production.

Freeze-fracture features of epithelioid cells, multinucleated giant cells, and phagocytic macrophages

1987

The freeze-fracture morphology of epithelioid cells, multinucleated giant cells (Langhans' type), and phagocytic macrophages was investigated. The intensely folded and interdigitating surface membranes of epithelioid cells and multinucleated giant cells displayed no specialized areas of cell contact. The size of the intramembranous particles (IMP) and the fact that the area density of IMPs was higher in the cytoplasmic (P) faces than in the external (E) faces of the cell membranes agreed with observations in other eukaryotic cells. The area densities of the IMPs suggest lower transport rates of molecules across the cell membranes of granuloma cells than of certain epithelial cells. Small pi…

Transplanted neural stem/precursor cells instruct phagocytes and reduce secondary tissue damage in the injured spinal cord

2012

Transplanted neural stem/precursor cells possess peculiar therapeutic plasticity and can simultaneously instruct several therapeutic mechanisms in addition to cell replacement. Here, we interrogated the therapeutic plasticity of neural stem/precursor cells after their focal implantation in the severely contused spinal cord. We injected syngeneic neural stem/precursor cells at the proximal and distal ends of the contused mouse spinal cord and analysed locomotor functions and relevant secondary pathological events in the mice, cell fate of transplanted neural stem/precursor cells, and gene expression and inflammatory cell infiltration at the injured site. We used two different doses of neural…

Contrasting responses of Kupffer cells and inflammatory mononuclear phagocytes to biliary obstruction in a mouse model of cholestatic liver injury.

2012

Background Biliary obstruction and cholestasis are serious complications of many liver diseases. Although resident hepatic macrophages (Kupffer cells) are frequently implicated in disease progression, most studies fail to differentiate the contribution of Kupffer cells and inflammatory mononuclear phagocytes (iMNPs) that infiltrate the liver subsequent to obstruction. Aim This study was undertaken to examine the roles and potential interactions of these two disparate mononuclear phagocyte populations in hepatic injury attending cholestasis. Methods Female, C57Bl/6 mice were injected with magnetic beads on day 3 prior to sham operation or bile duct ligation (BDL) to facilitate subsequent Kup…

Crystal-phagocyte interaction in calcinosis interstitialis.

1984

Based on recent findings indicating the stimulation of the respiratory burst in human neutrophils by crystal phagocytosis, ectopic calcified nodules of a patient with calcinosis interstitialis were exposed to autologous granulocytes and monocytes in vitro. The activity of the respiratory burst was determined by luminol-enhanced chemiluminescence. Controls included amorphous monosodium urate, microcrystalline monosodium urate, hydroxyapatite, and zymosan. Microcrystalline monosodium urate elicited a marked stimulation of both granulocytes and monocytes as did hydroxyapatite in granulocytes. Hydroxyapatite caused no stimulation of monocytes, possibly reflecting selective functional modulation…

Die Milzszintigraphie als Methode zur funktionellen Milzanalyse

1970

1. Percussion and palpation are only a superficial and subjective measure for the determination of a splenic tumor. Comparative scintigraphic and clinical investigations in more than 4,000 patients have shown that about 50% of spleens weighing between 600 and 750 g are not palpable. Considering the widespread use of radioisotope scanning it seems justified to claim that the size of the spleen during clinical investigation should be determined by a scan. In scientific problems one has to insist on the use of this method in any case. 2. Depending on the fact that until now no functional test for the spleen is available, it is of great importance that it is now possible to carry out a highly a…