Evidence that natural killer cells express mini P‐glycoproteins but not classic 170 kDa P‐glycoprotein

Evidence that natural killer cells express mini P‐glycoproteins but not classic 170 kDa P‐glycoprotein
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自然杀伤细胞表达微型 P 糖蛋白但不表达经典 170 kDa P 糖蛋白的证据

DOI:
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发表时间:
2001
影响因子:
6.5
通讯作者:
G. Woods
G. Woods
中科院分区:
医学2区
文献类型:
--
作者:
Christina M. Trambas;Zemin Wang;M. Cianfriglia;G. Woods

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逆转录聚合酶链式反应、免疫反应性以及它们排出罗丹明123的能力等一系列证据表明,自然杀伤(NK)细胞中存在P-糖蛋白。自然倾向于认为NK细胞的P-糖蛋白与多药耐药(MDR)细胞株的P-糖蛋白相同,然而,本研究发现了主要的差异。在功能上,NK细胞表现出一种受限的底物类型,不能运输柔红霉素和钙黄素乙酰氧甲酯,而有效地运输其他P-糖蛋白底物。此外,通过与P-糖蛋白抗体的不同反应建立了NK细胞P-糖蛋白的物理差异。NK细胞与C494和JSB-1有较强的反应性,而与C219无明显反应。此外,NK细胞不能与抗体MM4·17结合,除非它们被固定和渗透,但这种抗体通常识别P-糖蛋白的胞外表位。这些差异在用Western分析证明NK细胞不表达可检测到的170kDa P-糖蛋白水平时达到顶峰。相反,NK细胞表达约70和80 kDa的小分子“迷你P-糖蛋白”产物。总之,这些数据表明,NK细胞的主要P-糖蛋白种类是新的迷你P-糖蛋白,而不是MDR模型中的经典P-糖蛋白。
Several lines of evidence including reverse transcription polymerase chain reaction, immunoreactivity and their ability to efflux rhodamine 123 have implied the existence of P‐glycoprotein in natural killer (NK) cells. It has been a natural tendency to assume that NK‐cell P‐glycoprotein is identical to the P‐glycoprotein of multidrug resistant (MDR) cell lines, however, the present study uncovered major differences. Functionally, NK cells demonstrated a restricted substrate profile, being unable to transport daunorubicin and calcein acetoxymethylester while efficiently transporting other P‐glycoprotein substrates. Furthermore, physical differences in NK‐cell P‐glycoprotein were established by differential reactivity with P‐glycoprotein antibodies. NK cells demonstrated strong reactivity with C494 and JSB‐1, but did not react appreciably with C219. In addition, NK cells were unable to bind to the antibody MM4·17 unless they had been fixed and permeabilized, yet this antibody normally recognizes an extracellular epitope of P‐glycoprotein. These differences culminated in the demonstration using Western analysis that NK cells did not express detectable levels of 170 kDa P‐glycoprotein. Instead, NK cells expressed small‐molecular‐weight ‘mini P‐glycoprotein’ products, of approximately 70 and 80 kDa. Collectively, these data indicate that the predominant P‐glycoprotein species of NK cells are novel mini P‐glycoproteins and not the classic P‐glycoprotein of MDR models.
MDR1 基因特异性单克隆抗体 C494 与丙酮酸羧化酶发生交叉反应。
DOI: --
发表时间: 1994
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发表时间: 1990-01-01
影响因子: 11.1
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通过 MRK-16 单克隆抗体的表位作图确定 P-糖蛋白的拓扑结构。
DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
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