Protein kinase C and insulin receptor β-subunit serine phosphorylation in cultured foetal rat hepatocytes

Protein kinase C and insulin receptor β-subunit serine phosphorylation in cultured foetal rat hepatocytes
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培养胎鼠肝细胞中蛋白激酶C和胰岛素受体β亚基丝氨酸磷酸化

DOI:
10.1016/0303-7207(94)90030-2
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发表时间:
1994
影响因子:
4.1
通讯作者:
C. Plas
C. Plas
中科院分区:
医学2区
文献类型:
--
作者:
J. Zachayus;G. Cherqui;C. Plas

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在地黄苷渗透培养的胎儿肝细胞中,在[γ-32P]ATP和Ca2+存在下,胰岛素受体β-亚基在丝氨酸残基上高度磷酸化,这一过程在短时间暴露于胰岛素后增强,但没有检测到胰岛素受体的自磷酸化。与此相反,对分离的胎儿胰岛素受体进行的实验显示,胰岛素刺激丝氨酸磷酸化和酪氨酸自磷酸化。在渗透细胞中,胰岛素受体β-亚基磷酸化在应用渗透/磷酸化步骤之前暴露于12-肉豆蔻酸13-乙酸磷2分钟后增加,而PMA慢性治疗导致蛋白激酶C (PKC)下调抑制。PKC特异性抑制剂GF109203X显著降低了渗透细胞中胰岛素受体β-亚基的基础磷酸化和胰岛素增强磷酸化,但对分离的受体没有任何作用。短暂暴露于胰岛素和/或PKC活性调节剂10分钟后1小时,对[U-14C]葡萄糖中的糖原进行标记,结果显示PMA阻止胰岛素糖原反应,而GF109203X无效。因此,尽管PKC在培养的胎儿肝细胞中不直接负责胰岛素受体丝氨酸磷酸化,但它在生理上调节这一过程,从而可能抑制胰岛素受体酪氨酸激酶的活性。这种调节独立于pma激活的PKC对胰岛素糖原反应的拮抗作用。
In digitonin-permeabilized cultured foetal hepatocytes, insulin receptor β-subunit was highly phosphorylated on serine residues in the presence of [γ-32P]ATP and Ca2+, a process enhanced after short exposure to insulin with no detectable insulin receptor autophosphorylation. By contrast with this situation, experiments performed with isolated foetal insulin receptors revealed an insulin stimulation of both serine phosphorylation and tyrosine autophosphorylation. In permeabilized cells, insulin receptorβ-subunit phosphorylation was increased after a 2-min exposure to phorbol 12-myristate 13-acetate (PMA) prior to applying the permeabilization/phosphorylation step, while it was inhibited by chronic treatment with PMA leading to protein kinase C (PKC) down modulation. The PKC specific inhibitor, GF109203X, strikingly reduced basal and insulin-enhanced phosphorylation of insulin receptor β-subunit in permeabilized cells, but failed to exert any effect with isolated receptors. Labelling of glycogen from [U-14C] glucose determined l h after a 10-min transitory exposure to insulin and/or modulators of PKC activity showed that PMA prevented insulin glycogenic response, whereas GF109203X was ineffective. Thus, although not directly responsible for insulin receptor serine phosphorylation in cultured foetal hepatocytes, PKC physiologically regulates this process which may inhibit insulin receptor tyrosine kinase activity. This regulation is independent of the antagonistic effect of PMA-activated PKC on insulin glycogenic response.
杆状病毒表达系统中的人胰岛素受体酪氨酸激酶与无细胞系统中蛋白激酶 C 的相互作用。
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佛波酯介导的蛋白激酶 C 与野生型和 COOH 末端截短的胰岛素受体相互作用。
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人胰岛素受体的苏氨酸 1336 是蛋白激酶 C 磷酸化的主要靶点。
DOI: 10.1021/bi00459a020
发表时间: 1990
期刊: Biochemistry
影响因子: 2.9
作者:
Lewis,RE;Cao,L;Perregaux,D;Czech,MP
通讯作者: Czech,MP
佛波酯诱导的胰岛素受体丝氨酸磷酸化降低其酪氨酸激酶活性。
DOI: --
发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Kahn,CR