首页> 外文期刊>Journal of Epithelial Biology & Pharmacology >Tobacco Smoke Activates Protein Association and Tyrosine Phosphorylation of the GPI-Transamidase Complex Subunits in Human Cancers
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Tobacco Smoke Activates Protein Association and Tyrosine Phosphorylation of the GPI-Transamidase Complex Subunits in Human Cancers

机译:烟草烟雾激活人类癌症中GPI-转​​酰胺酶复合物亚基的蛋白质缔合和酪氨酸磷酸化

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We previously found that the protein subunits of GPI-transamidase complex (e.g. PIG-U, PIG-T and GPAA1)play critical roles of oncogenes in human bladder and breast cancers manifesting their activities through signaling mechanismsthat involve urokinase receptor/Stat3 and paxillin pathways. We report here that cigarette smoke extract (CSE) enhancedcolony formation and invasiveness of certain human cancer cells (e.g. head and neck, bladder or breast). We foundthat CSE induced the complex formation between PIG-U, PIG-T and GPAA1 proteins and also the association betweenGPAA1 and EGFR in cancer cells. We observed that inhibitors of EGFR tyrosine kinase, Gefitinib or Erlotinib, modulatedtyrosine phosphorylation of PIG-U and PIG-T induced by CSE. We also found that EGFR tyrosine kinase inhibitorsand siRNA silencing of PIG-U, PIG-T or GPAA1 modulated the CSE-induced increase in colony formation and invasivenessof human bladder cancer cells. We suggest that the novel mechanism overlapping the oncogenic potential of PIG-U,PIG-T and GPAA1 implicates EGFR tyrosine phosphorylation of PIG-U or PIG-T and subsequent paxillin phosphorylation.
机译:我们先前发现,GPI-转​​酰胺酶复合物的蛋白亚基(例如PIG-U,PIG-T和GPAA1)在人类膀胱癌和乳腺癌中扮演着癌基因的关键角色,通过涉及尿激酶受体/ Stat3和paxillin途径的信号传导机制显示其活性。我们在此报告,香烟烟雾提取物(CSE)增强了某些人类癌细胞(例如头和颈部,膀胱或乳房)的菌落形成和侵袭性。我们发现,CSE诱导癌细胞中PIG-U,PIG-T和GPAA1蛋白之间的复杂形成,以及GPAA1和EGFR之间的关联。我们观察到EGFR酪氨酸激酶,吉非替尼或厄洛替尼的抑制剂可抑制CSE诱导的PIG-U和PIG-T的酪氨酸磷酸化。我们还发现,EGFR酪氨酸激酶抑制剂和PIG-U,PIG-T或GPAA1的siRNA沉默调节了CSE诱导的人膀胱癌细胞集落形成和侵袭性增加。我们建议,这种新颖的机制与PIG-U,PIG-T和GPAA1的致癌潜力重叠,牵涉到PIG-U或PIG-T的EGFR酪氨酸磷酸化以及随后的Paxillin磷酸化。

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