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• W4313310180 abstract "Abstract Lymphocyte preparations isolated from the human peripheral blood were exposed to different acid pH or incubated at 37°C and the presence of immunoglobulin (Ig) on the cell surface was examined by immunofluorescence (IF) tests. Subsequently, such treated cells were incubated in the autologous serum or in the purified IgG, IgA or IgM proteins and their ability to bind each class of Ig was examined. The results showed that IgG molecules dissociated from large proportions of IgG-positive cells upon exposure to pH 4 at 1°C for 1 min or upon incubation at 37°C for 20 min. The cells from which IgG had been dissociated could again combine with IgG, whereupon the number of positive cells increased, being restored to the number equivalent to or higher than those before acid or 37°C treatment. These results indicated that the treatment could elute the cell-bound IgG present on the cell and that the receptor sites were not degraded by the treatment and could combine with IgG. These cell-bound IgG were observed not only on the monocytes, but also on the small lymphocytes. It was also found that certain proportions of mononuclear cells carried the cell-bound IgA that could be dissociated with acid pH or 37°C. No cell-bound IgM was observed on any mononuclear cells. Microscopic observations before and after acid or 37°C treatment revealed that the staining distribution of the cell-bound IgG and IgA on the cell was granular, appearing as a discontinuous fluorescence ring and forming multiple aggregates but no typical polar caps on warming. In contrast, IgG, IgA, and IgM stable to acid or 37°C treatment were found on the lymphocytes but not on the monocytes, and their staining distribution was uniformly diffuse, appearing as a continuous ring and forming a typical cap on warming. Exposure of the cells to pH 4 or to 37°C could also elute the cell-bound IgG passively adsorbed to the human lymphoid cells in a culture, but did not affect the intrinsic S.Ig on the lymphoid cells in a culture or on the lymphoma cells. These results indicate that the exposure of the cells to acid pH or to 37°C may enable us to detect unfailingly S.Ig lymphocytes by removing the cell-bound IgG and IgA present on the monocytes and/or lymphocytes. Thus, an average value of approximately 10% was obtained for the S.Ig lymphocyte in the lymphocyte preparations from 11 healthy individuals. In addition, the results provided the evidence that, even in normal peripheral blood lymphocytes, there may be a population of B lymphocytes which lack the S.Ig but carry the cell-bound Ig." @default.
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• W4313310180 date "1975-10-01" @default.
• W4313310180 modified "2023-10-16" @default.
• W4313310180 title "Studies of Surface Immunoglobulins on Human B Lymphocytes" @default.
• W4313310180 doi "https://doi.org/10.4049/jimmunol.115.4.982" @default.
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