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
中科院分区:
文献类型:
--
作者:
J. Zachayus;G. Cherqui;C. Plas
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.
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DOI:
--
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Ahn,J;Donner,DB;Rosen,OM
通讯作者:
Rosen,OM
DOI:
--
发表时间:
1990
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Lewis,RE;Wu,GP;MacDonald,RG;Czech,MP
通讯作者:
Czech,MP
DOI:
--
发表时间:
1991
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Anderson,CM;Olefsky,JM
通讯作者:
Olefsky,JM
影响因子:
2.9
作者:
Lewis,RE;Cao,L;Perregaux,D;Czech,MP
通讯作者:
Czech,MP
DOI:
--
发表时间:
1988
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Takayama,S;White,MF;Kahn,CR
通讯作者:
Kahn,CR