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- W2003181504 abstract "The increase of intracellular free calcium concentration ([Ca(2+)](i)) and protein kinase C (PKC) activity are two major early mitogenic signals to initiate proliferation of human peripheral T cells. Bacterial lipopolysaccharide (LPS) is nonmitogenic in human T cells. However, in the presence of monocytes, LPS becomes mitogenic to proliferate T cells. The aim of this study was to define the incompetency of LPS on two mitogenic signals in human peripheral T cells. T cells were isolated from human peripheral blood. [Ca(2+)](i) and pH(i) were determined by loading the cells with the fluorescent dyes, Fura-2 acetoxymethyl ester (Fura-2/AM) and 2',7'-bis(2-carboxyethyl)-5-(and 6)carboxyfluorescein acetoxymethyl ester (BCECF/AM). PKC activity was determined by protein kinase assay and cell proliferation was estimated from the incorporation of [(3)H]-thymidine. The results indicated that (1) LPS (10 microg/ml) stimulated PKC activity significantly within 5 min, reached a plateau at 30 min, and maintained that level for at least 2 h; and (2) LPS stimulated cytoplasmic alkalinization but did not affect the levels of [Ca(2+)](i) and [(3)H]-thymidine incorporation into T cells. Moreover, the combination of calcium ionophore A23187 with LPS significantly stimulated [(3)H]-thymidine incorporation into T cells. Thus, the results demonstrate that LPS failed to proliferate T cells, probably because of a lack of the machinery necessary to stimulate the mitogenic signal on [Ca(2+)](i) elevation." @default.
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- W2003181504 date "2000-03-01" @default.
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- W2003181504 title "Bacterial lipopolysaccharide activates protein kinase C, but not intracellular calcium elevation, in human peripheral T cells" @default.
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- W2003181504 doi "https://doi.org/10.1002/(sici)1097-4644(20000301)76:3<404::aid-jcb8>3.0.co;2-e" @default.
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