title: Roles of ERK, PI3 kinase, and PLC-gamma pathways induced by overexpression of translationally controlled tumor protein in HeLa cells.
abstract: We reported previously that translationally controlled tumor protein (TCTP) is a cytoplasmic repressor of Na,K-ATPase in HeLa cells. In the current study, we showed that TCTP overexpression using adenovirus as vehicle, induced partial inhibition of Na,K-ATPase; phosphorylation of EGFR tyrosine residues 845, 992,1068, and 1148; activation of Ras/Raf/ERK pathway; activation of PI3K/Akt pathway; and phosphorylation of PLC-gamma in HeLa cells. Specific inhibition of PI3K/Akt pathway in contrast to the inhibition of ERK,significantly decreased TCTP overexpression-induced survival signal. Inhibition of PLC-gamma pathway significantly decreased TCTP overexpression-induced cell migration but inhibition of ERK had less effect. These results suggest that TCTP plays a key physiological role in cell survival through Akt pathway and migration through PLC-gamma pathway.
authors.affiliation: College of Pharmacy, Center for Cell Signaling and Drug Discovery Research, Ewha Womans University, 11-1 Daehyun-dong, Sudaemoon-gu, Seoul, Republic of Korea.
authors.forename: Moonhee
authors.initials: M
authors.lastname: Kim
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Jung
authors.forename: Kyunglim
authors.initials: K
authors.lastname: Lee
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D014408:Biomarkers, Tumor / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D066246:ErbB Receptors / Q000378:metabolism; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D015870:Gene Expression; D006367:HeLa Cells; D006801:Humans; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D051966:Phospholipase C gamma / Q000378:metabolism*; D010766:Phosphorylation; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D019908:Proto-Oncogene Proteins c-raf / Q000378:metabolism; D015398:Signal Transduction; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D000090324:Tumor Protein, Translationally-Controlled 1; D018631:ras Proteins / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D066246:ErbB Receptors; D048049:Extracellular Signal-Regulated MAP Kinases; D019869:Phosphatidylinositol 3-Kinases; D051966:Phospholipase C gamma; D051057:Proto-Oncogene Proteins c-akt; D019908:Proto-Oncogene Proteins c-raf; D000254:Sodium-Potassium-Exchanging ATPase; D000090324:Tumor Protein, Translationally-Controlled 1; D018631:ras Proteins; C000715647:TPT1 protein, human