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Search results for: Mouse Anti-Human CD3 [+FITC] Antibodies

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#15896799   2005/04/09 To Up

Removal of therapeutic anti-lymphocyte antibodies from human sera prior to anti-human leukocyte antibody testing.

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Christopher M Bearden, Benita K Book, Richard A Sidner, Mark D Pescovitz

2837 related Products with: Removal of therapeutic anti-lymphocyte antibodies from human sera prior to anti-human leukocyte antibody testing.

100 100UG 100UG0.1 mg200 100UG100 Tests1 mg1 mg100ul200 1 mg

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#8853799   // To Up

Human peripheral blood lymphocyte-reconstituted, severe combined immunodeficient mice as a model for porcine islet xenograft rejection in humans.

Previously we established human peripheral blood lymphocyte-reconstituted severe combined immunodeficiency (SCID) (hu-PBL-SCID) mice as a model for human islet allograft rejection. The function of xenografted hu-PBL was confirmed to reject human alloislets in hu-PBL-SCID mice. In this study, we modified this model as a porcine islet xenograft to study porcine islet rejection in humans. Chimeric mice were used as the recipients of porcine islets to reveal the mechanisms of xenograft rejection in humans. SCID mice were reconstituted with 30 x 10(6) of hu-PBL initially, and 10 x 10(6) of antihuman CD3-primed PBL was injected intraperitoneally 2 days later as a booster. An additional booster injection provided greater possibility (86.7%, n = 15) of chimera establishment as well as a higher human immunoglobulin concentration in SCID mice than the single injection group. In an in vitro assay, sera from hu-PBL-SCID mice were found to recognize porcine islets by FACS staining. In an in vivo study, immunofluorescent analysis of a frozen section showed that human immunoglobulins adhered to the xenografted porcine islet under the kidney capsule of hu-PBL-SCID mice. Although no mouse immunoglobulins were detected on sections, mouse complement (C3) was shown to adhere to the xenografted porcine islet. Thus, hu-PBL-SCID mice provide a useful model for investigating the real-life situation of porcine islet xenograft rejection in humans.
R Shiroki, B Nazirrudin, K Hoshinaga, Y Naide, D W Scharp, T Mohanakumar

1075 related Products with: Human peripheral blood lymphocyte-reconstituted, severe combined immunodeficient mice as a model for porcine islet xenograft rejection in humans.

100 μg 100 UG100 μg100 μg100 μg100 μg

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#7690792   // To Up

Characterization of the Fc mu receptor on human natural killer cells. Interaction with its physiologic ligand, human normal IgM, specificity of binding, and functional effects.

After treatment with human normal IgM, 78 +/- 8% of purified CD3-CD56+ resting human NK cells and 93 +/- 6% of IL-2-activated NK cells selected by adherence to plastic reacted with FITC-goat anti-human IgM. Binding of IgM to the FcR for IgM (Fc mu R) on human NK cells was not species specific because mouse myeloma IgM also bound to these cells. The percentage of CD56+ cells binding IgM after incubation with anti-CD16 mAb was similar to that of cells incubated with medium alone (95 +/- 1% vs 93 +/- 4%). Binding of anti-CD16 mAb to Fc gamma RIII on NK cells was unaffected by pretreatment with IgM (65 +/- 12% vs 69 +/- 4%). The CD7 molecule has been reported to be the Fc mu R on the surface of T cells. Two-color flow cytometry showed that 94 +/- 3% of CD3-CD56+ resting NK cells and 71 +/- 16% of activated NK cells were CD7+. Preincubation of NK cells with three anti-CD7 mAb (Leu-9, 8H8-1, and LAU-A1) failed to block the binding of IgM to the Fc mu R. Modulation of the CD7 molecule off the cell surface (CD7+ = 1.5% +/- 0.3) did not reduce IgM binding, thus excluding the possibility that IgM anti-CD7 might bind to different epitopes of the same molecule. These data indicate that the Fc mu R is a specific Ig-binding structure, distinct from the Fc gamma RIII (CD16) or CD7. The Fc mu R on NK cells functions as a signal-transducing molecule because the addition of 0.2 mg/ml IgM to R-NK cells caused a rapid increase in [Ca2+]i (delta = 40 nM). One of the early events that followed signaling through the Fc mu R was the down-modulation of IFN-gamma gene expression and IFN gamma production in NK cells. The presence of IgM during culture of NK cells consistently decreased the expression of HLA-DR (16% vs 40% in control). Thus, the Fc mu R, a constitutively-expressed receptor on human NK cells, seems to be an important functional molecule, which delivers negative regulatory signals to NK cells.
L Pricop, H Rabinowich, P A Morel, A Sulica, T L Whiteside, R B Herberman

2011 related Products with: Characterization of the Fc mu receptor on human natural killer cells. Interaction with its physiologic ligand, human normal IgM, specificity of binding, and functional effects.

200 0.1 mg96 wells (1 kit)100ul96T1 ml

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