Erythropoietin stimulates the tyrosine phosphorylation of Shc and its association with Grb2 and a 145-Kd tyrosine phosphorylated protein.

Erythropoietin stimulates the tyrosine phosphorylation of Shc and its association with Grb2 and a 145-Kd tyrosine phosphorylated protein.
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促红细胞生成素刺激 Shc 的酪氨酸磷酸化及其与 Grb2 和 145-Kd 酪氨酸磷酸化蛋白的关联。

DOI:
10.1182/blood.v82.8.2296.2296
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发表时间:
1993
期刊:
影响因子:
20.3
通讯作者:
Gerald Krystal
Gerald Krystal
中科院分区:
医学1区
文献类型:
--
作者:
J. E. Damen;Ling Liu;R. Cutler;Gerald Krystal

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虽然促红细胞生成素受体(EpR)缺乏酪氨酸激酶的共识序列内的脯氨酸丰富的胞内结构域,除了其配体的EP-响应细胞刺激快速和短暂的酪氨酸磷酸化的细胞蛋白质的数量。这些磷酸化底物,其中包括5个主要的磷蛋白分子量约为145,130,97,72,和56 Kd的表征是一个重要的步骤,在理解所使用的信号转导途径Ep。最近,我们和其他人已经表明,主要的72-Kd酪氨酸磷酸化蛋白是EpR本身。我们现在报告,使用鼠DA-3和人MO 7 E细胞系工程表达高水平的生物反应性EpRs(并指定DA-ER和MO 7-ER,分别),主要的56-Kd酪氨酸磷酸化蛋白是最近确定的含SH 2的蛋白质,p52 shc。有趣的是,在EP刺激的细胞中,抗Shc抗体共沉淀DA-ER和MO 7-ER细胞中主要的145-Kd酪氨酸磷酸化蛋白。两种蛋白质的酪氨酸磷酸化在37 ℃下与Ep孵育30秒内可检测到,在2至5分钟之间达到最大值,并在30分钟时下降。此外,酪氨酸磷酸化的Shc似乎能够与活化的EpR结合,但这只能在MO 7-ER细胞中显示。最后,如先前用含有表皮生长因子、血小板衍生生长因子和胰岛素的受体的酪氨酸激酶所示,EpR的活化导致p52 shc与25-Kd多肽Grb 2的缔合。两者合计,我们的数据表明,先前报道的rasGTP增加观察Ep的结果,部分,从酪氨酸磷酸化的Shc和它的协会与Grb 2和/或酪氨酸磷酸化的145-Kd蛋白。
Although the erythropoietin receptor (EpR) lacks a tyrosine kinase consensus sequence within its proline-rich intracellular domain, addition of its ligand to Ep-responsive cells stimulates the rapid and transient tyrosine phosphorylation of a number of cellular proteins. The characterization of these phosphorylatable substrates, which include 5 major phosphoproteins with molecular masses of approximately 145, 130, 97, 72, and 56 Kd is an essential step in understanding the signal transduction pathways used by Ep. Recently, we and others have shown that the major 72-Kd tyrosine phosphorylated protein is the EpR itself. We now report, using both murine DA-3 and human MO7E cell lines engineered to express high levels of biologically responsive EpRs (and designated DA-ER and MO7-ER, respectively), that the major 56-Kd tyrosine phosphorylated protein is the recently identified SH2-containing protein, p52shc. Interestingly, in Ep-stimulated cells, anti-Shc antibodies coprecipitate the major 145-Kd tyrosine phosphorylated protein in both DA-ER and MO7-ER cells. Tyrosine phosphorylation of both proteins is detectable within 30 seconds of incubation with Ep at 37 degrees C, reaches a maximum between 2 and 5 minutes, and declines by 30 minutes. In addition, tyrosine phosphorylated Shc appears capable of associating with the activated EpR, but this could only be shown in MO7-ER cells. Lastly, as has been shown previously with the tyrosine kinase containing receptors for epidermal growth factor, platelet derived growth factor, and insulin, activation of the EpR leads to the association of p52shc with the 25-Kd polypeptide, Grb2. Taken together, our data suggest that the previously reported increases in rasGTP observed with Ep result, in part, from the tyrosine phosphorylation of Shc and its association with Grb2 and/or a tyrosine phosphorylated 145-Kd protein.
促红细胞生成素诱导 Raf-1 激活,而 Raf-1 是促红细胞生成素介导的增殖所必需的。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
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DOI: 10.1126/science.8484124
发表时间: 1993-05-07
期刊: SCIENCE
影响因子: 56.9
作者:
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通讯作者: ALTMAN, A
DOI: 10.1126/science.8493579
发表时间: 1993-05-28
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影响因子: 56.9
作者:
CHARDIN, P;CAMONIS, JH;BARSAGI, D
通讯作者: BARSAGI, D
DOI: 10.1126/science.1736363
发表时间: 1992-01-31
期刊: SCIENCE
影响因子: 56.9
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促红细胞生成素的增殖作用与响应性 B6SUt.EP 细胞中蛋白质酪氨酸的快速磷酸化有关。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Quelle,FW;Wojchowski,DM
通讯作者: Wojchowski,DM