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首页> 外文期刊>Journal of Cellular Physiology >Cell density-dependent regulation of PLC gamma 1 tyrosine phosphorylation and catalytic activity in an intestinal cell line (IEC-6).
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Cell density-dependent regulation of PLC gamma 1 tyrosine phosphorylation and catalytic activity in an intestinal cell line (IEC-6).

机译:细胞密度制约的PLCγ1的规定酪氨酸磷酸化和催化活性在一个肠细胞系(IEC-6)。

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Administration of epidermal growth factor (EGF) to rats has been shown to induce both mitogenic and nonmitogenic responses in the intestine. The mechanisms to describe a multiplicity of hormonal responses within a single tissue are unclear but likely involve selectivity among receptor substrates. A nontransformed rat jejunal crypt intestinal epithelial cell line (IEC-6) was studied to determine if the regulation of receptor tyrosine kinase substrates is affected by cell population physiology. EGF stimulated a rapid increase in inositol trisphosphate in confluent but not subconfluent cells. Similarly, treatment of confluent IEC-6 cells with EGF provoked a significant increase in the hydrolysis of PtdIns 4,5-P2 by immunoisolated PLC gamma 1. The tyrosine phosphorylation state of PLC gamma 1 and the association of PLC gamma 1 with the EGF receptor were increased by EGF in confluent cells only. In contrast, the autophosphorylation state of the EGF receptor and the tyrosine phosphorylation state of another SH2-containing EGF receptor substrate SHC were increased by EGF regardless of cell density. Western blot analysis revealed equal protein expression of PLC gamma 1 in confluent and subconfluent cells. EGF receptor protein expression and ligand binding capacity were slightly increased in confluent compared to subconfluent cells. EGF regulation of PLC gamma 1, therefore, is regulated by physiological factors dependent on cell density in IEC-6 cells.
机译:表皮生长因子(EGF)的管理老鼠可以诱导和促有丝分裂的nonmitogenic肠道反应。描述的多重性荷尔蒙的机制尚不清楚,但在一个组织的反应可能涉及选择性受体之一基板。肠道上皮细胞系(IEC-6)研究确定的规定受体酪氨酸激酶的底物的影响通过细胞群生理机能。肌醇联结在迅速增加汇合的但不是subconfluent细胞。治疗支流IEC-6细胞EGF在水解引起显著增加PtdIns 4, 5-P2 immunoisolated PLCγ1。PLC的酪氨酸磷酸化状态γ1协会和PLC与EGFγ1EGF受体增加的融合性的细胞只有。的表皮生长因子受体酪氨酸另一个SH2-containing的磷酸化状态人体自燃现象EGF受体底物增加了EGF不管细胞密度。显示相同蛋白表达的PLCγ1在支流和subconfluent细胞。蛋白表达和配体结合能力略增加相比,融合性的subconfluent细胞。因此,1是由生理在IEC-6细胞因子依赖细胞密度。

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