首页> 外文期刊>International journal of immunopharmacology >Endotoxin-induced protein phosphorylation in macrophages is modulated by tumor cells.
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Endotoxin-induced protein phosphorylation in macrophages is modulated by tumor cells.

机译:内毒素诱导的巨噬细胞蛋白磷酸化受到肿瘤细胞的调节。

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Tumor cells are known to modulate the antitumor functions of endotoxin or cytokine-stimulated macrophages, however, their mechanism of action is not known. We have recently shown that Dalton's lymphoma (DL, a murine spontaneous T cell lymphoma) alter the activation of macrophages by lipopolysaccharide (LPS). In this investigation, the effects of DL cells on protein kinase C (PKC) activity, calcium uptake and protein tyrosine phosphorylation in murine peritoneal macrophages was studied. Treatment of macrophages with LPS resulted in the translocation of PKC from cytosol to the membrane fraction. Incubation of macrophages with DL cells or DL cell lysate (DLL) resulted in a significant decrease in the PKC activity in membrane fraction compared to the LPS-treated macrophages incubated without DL cells or DLL. DL cells were also found to inhibit the accumulation and influx of calcium in the macrophages in response to LPS. On the other hand, DL cells augmented the protein tyrosine phosphorylation in murine macrophages. Only viable DL cells were found to increase the protein tyrosine phosphorylation whereas DLL did not have any effect on protein tyrosine phosphorylation in macrophages. These results thus suggest that tumor cells and/or their products can differentially effect the phosphorylation of different proteins involved in cell signalling.
机译:已知肿瘤细胞可调节内毒素或细胞因子刺激的巨噬细胞的抗肿瘤功能,但是,其作用机理尚不清楚。最近,我们发现道尔顿淋巴瘤(DL,一种小鼠自发性T细胞淋巴瘤)通过脂多糖(LPS)改变了巨噬细胞的激活。在这项研究中,研究了DL细胞对鼠腹膜巨噬细胞中蛋白激酶C(PKC)活性,钙摄取和蛋白酪氨酸磷酸化的影响。用LPS处理巨噬细胞导致PKC从胞质溶胶转移到膜部分。与没有DL细胞或DLL的LPS处理的巨噬细胞相比,巨噬细胞与DL细胞或DL细胞裂解液(DLL)的孵育导致膜级分中PKC活性显着降低。还发现DL细胞响应于LPS抑制巨噬细胞中钙的积累和流入。另一方面,DL细胞增强了鼠巨噬细胞中蛋白质酪氨酸的磷酸化。发现仅存活的DL细胞增加蛋白质酪氨酸磷酸化,而DLL对巨噬细胞中蛋白质酪氨酸磷酸化没有任何影响。因此,这些结果表明,肿瘤细胞和/或其产物可以差异地影响参与细胞信号转导的不同蛋白质的磷酸化。

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