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首页> 外文期刊>Cytokine >A quantitative focus assay for titration of retroviruses that encode human granulocyte-macrophage colony-stimulating factor (GM-CSF).
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A quantitative focus assay for titration of retroviruses that encode human granulocyte-macrophage colony-stimulating factor (GM-CSF).

机译:用于定量编码人类粒细胞-巨噬细胞集落刺激因子(GM-CSF)的逆转录病毒的定量聚焦测定。

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摘要

Granulocyte-macrophage colony-stimulating factor (GM-CSF) is a haematopoietic growth factor that regulates proliferation, differentiation, and effector functions of monocyte-macrophages and granulocytic cells. Because of the ability of this cytokine to enhance immune functions of antigen-presenting cells, retroviruses encoding GM-CSF have been used to transduce GM-CSF into murine and human tumour cells as part of autologous tumour vaccine strategies. We have previously shown that NIH 3T3 cells engineered to express functional human GM-CSF receptors (hGMR-NIH 3T3), become fully transformed when these cells are incubated in the presence but not in the absence of human GM-CSF. In this study we have used these hGM-CSF conditional transformants to devise a sensitive focus assay to titrate retroviruses encoding hGM-CSF, using MFG-hGM-CSF/Psi-CRIP as our model virus. This helper-free amphotropic retrovirus, which has been frequently used to transduce hGM-CSF into tumour cells, was quite transforming in our indicator cell line, exhibiting virus titres well above 10(5)FFU/ml. The transformation-based assay described here allows rapid determination of the titre of hGM-CSF-viruses, and may serve as a model for development of quantitative assays for other cytokine-encoding viruses of clinical importance. Copyright 1999 Academic Press.
机译:粒细胞巨噬细胞集落刺激因子(GM-CSF)是一种造血生长因子,可调节单核巨噬细胞和粒细胞的增殖,分化和效应功能。由于这种细胞因子增强抗原呈递细胞的免疫功能的能力,编码GM-CSF的逆转录病毒已被用作自体肿瘤疫苗策略的一部分,将GM-CSF转化为鼠和人肿瘤细胞。先前我们已经显示,工程改造为表达功能性人GM-CSF受体(hGMR-NIH 3T3)的NIH 3T3细胞在有或没有人GM-CSF的情况下孵育时会完全转化。在这项研究中,我们使用MFG-hGM-CSF / Psi-CRIP作为我们的模型病毒,使用这些hGM-CSF条件转化子设计了一种敏感的焦点分析,以滴定编码hGM-CSF的逆转录病毒。这种无助剂的两性逆转录病毒,经常被用来将hGM-CSF导入肿瘤细胞,在我们的指示细胞系中发生了很大的转化,其病毒滴度远高于10(5)FFU / ml。本文所述的基于转化的测定法可快速测定hGM-CSF病毒的效价,并可作为开发其他具有临床重要性的细胞因子编码病毒的定量测定法的模型。版权所有1999,学术出版社。

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