Divergent pathways in COS-7 cells mediate defective internalization and intracellular routing of truncated G-CSFR forms in SCN/AML.

Divergent pathways in COS-7 cells mediate defective internalization and intracellular routing of truncated G-CSFR forms in SCN/AML.
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COS-7细胞中的发散途径介导SCN/AML中截短的G-CSFR形式的有缺陷的内在化和细胞内路由。

DOI:
10.1371/journal.pone.0002452
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发表时间:
2008-06-18
期刊:
影响因子:
3.7
通讯作者:
Avalos BR
Avalos BR
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hunter MG;McLemore M;Link DC;Loveland M;Copelan A;Avalos BR

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在SCN/AML患者中表达截短的G-CSFR形式诱导过度增殖和延长细胞存活。以前,我们表明,配体内化延迟和截断G-CSFR形式的降解是有缺陷的SCN/AML患者。在这项研究中,我们研究了G-CSFR细胞质结构域中基于双亮氨酸和酪氨酸的基序在调节配体/受体内化中的潜在作用。使用放射性标记配体和COS-7细胞的标准结合试验,在G-CSFR中的双亮氨酸基序的取代或酪氨酸残基的缺失并不改变内化。转铁蛋白受体YTRF内化基序与来自患有SCN/AML的患者的截短的G-CSFR形式的连接纠正了缺陷性内化,但没有受体降解,这表明受体内化和降解通过不同的结构域和/或过程独立地发生。我们的数据表明,不同的域内的G-CSFR介导的受体内化和降解的单独过程。我们的研究结果使用标准的结合测定不同于最近发表的数据,利用流式细胞术。
Expression of truncated G-CSFR forms in patients with SCN/AML induces hyperproliferation and prolonged cell survival. Previously, we showed that ligand internalization is delayed and degradation of truncated G-CSFR forms is defective in patients with SCN/AML. In this study, we investigated the potential roles of dileucine and tyrosine-based motifs within the cytoplasmic domain of the G-CSFR in modulating ligand/receptor internalization. Using standard binding assays with radiolabeled ligand and COS-7 cells, substitutions in the dileucine motif or deletion of tyrosine residues in the G-CSFR did not alter internalization. Attachment of the transferrin receptor YTRF internalization motif to a truncated G-CSFR form from a patient with SCN/AML corrected defective internalization, but not receptor degradation suggesting that receptor internalization and degradation occur independently via distinct domains and/or processes. Our data suggest that distinct domains within the G-CSFR mediate separate processes for receptor internalization and degradation. Our findings using standard binding assays differ from recently published data utilizing flow cytometry.
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