Protein tyrosine phosphatase (PTP)-proline-,glutamate-,serine-,and threonine-rich sequence (PEST) is ubiquitously expressed and is a critical regulator of cell adhesion and migration.PTP-PEST activity can be regulated...Protein tyrosine phosphatase (PTP)-proline-,glutamate-,serine-,and threonine-rich sequence (PEST) is ubiquitously expressed and is a critical regulator of cell adhesion and migration.PTP-PEST activity can be regulated transcriptionally via gene deletion or mutation in several types of human cancers or via post-translational modifications,including phosphorylation,oxidation,and caspase-dependent cleavage.PTP-PEST interacts with and dephosphorylates cytoskeletal and focal adhesion-associated proteins.Dephos-phorylation of PTP-PEST substrates regulates their enzymatic activities and/or their interaction with other proteins and plays an essential role in the tumor cell migration process.展开更多
The publishing conference of the Chinese version of National Comprehensive Cancer Network （NCCN） Clinical Practice Guidelines in Oncology （hereinafter referred to as NCCN Guidelines） and the inaugural peer reviewe...The publishing conference of the Chinese version of National Comprehensive Cancer Network （NCCN） Clinical Practice Guidelines in Oncology （hereinafter referred to as NCCN Guidelines） and the inaugural peer reviewer meeting of NCCN Clinical Practice Guidelines in Oncology： Digestive System Cancers （hereinafter referred to as NCCN Guidelines on Digestive System Cancers） were held in People＇s Medical Publishing House in January 28^th, 2016 （Figure 1）.展开更多
Translational repression is a conserved mechanism in microRNA(miRNA)-guided gene silencing.In Arabidopsis,ARGONAUTE1(AGO1),the major miRNA effector,localizes in the cytoplasm for mRNA cleavage and at the endoplasmic r...Translational repression is a conserved mechanism in microRNA(miRNA)-guided gene silencing.In Arabidopsis,ARGONAUTE1(AGO1),the major miRNA effector,localizes in the cytoplasm for mRNA cleavage and at the endoplasmic reticulum(ER)for translational repression of target genes.However,the mechanism underlying miRNA-mediated translational repression is poorly understood.In particular,how the subcellular partitioning of AGO1 is regulated is largely unexplored.Here,we show that the plant hormone brassinosteroids(BRs)inhibit miRNA-mediated translational repression by negatively regulating the distribution of AGO1 at the ER in Arabidopsis thaliana.We show that the protein levels rather than the transcript levels of miRNA target genes were reduced in BR-deficient mutants but increased under BR treatments.The localization of AGO1 at the ER was significantly decreased under BR treatments while it was increased in the BR-deficient mutants.Moreover,ROTUNDIFOLIA3(ROT3),an enzyme involved in BR biosynthesis,co-localizes with AGO1 at the ER and interacts with AGO1 in a GW motif-dependent manner.Complementation analysis showed that the AGO1-ROT3 interaction is necessary for the function of ROT3.Our findings provide new clues to understand how miRNA-mediated gene silencing is regulated by plant endogenous hormones.展开更多
基金supported by National Cancer Institute grants 2R01CA109035 (Z.L.) and CA16672(Cancer Center Support Grant)research grant RP110252 (Z.L.) from the Cancer Prevention and Research Institute of Texas (CPRIT)+2 种基金American Cancer Society Research Scholar Award RSG-09-277-01-CSM(Z.L.)the James S. McDonnell Foundation 21st Century Science Initiative in Brain Cancer Research Award(220020318 Z.L.)a Sister Institution Network Fund from The University of Texas MD Anderson Cancer Center (Z.L.)
文摘Protein tyrosine phosphatase (PTP)-proline-,glutamate-,serine-,and threonine-rich sequence (PEST) is ubiquitously expressed and is a critical regulator of cell adhesion and migration.PTP-PEST activity can be regulated transcriptionally via gene deletion or mutation in several types of human cancers or via post-translational modifications,including phosphorylation,oxidation,and caspase-dependent cleavage.PTP-PEST interacts with and dephosphorylates cytoskeletal and focal adhesion-associated proteins.Dephos-phorylation of PTP-PEST substrates regulates their enzymatic activities and/or their interaction with other proteins and plays an essential role in the tumor cell migration process.
文摘The publishing conference of the Chinese version of National Comprehensive Cancer Network （NCCN） Clinical Practice Guidelines in Oncology （hereinafter referred to as NCCN Guidelines） and the inaugural peer reviewer meeting of NCCN Clinical Practice Guidelines in Oncology： Digestive System Cancers （hereinafter referred to as NCCN Guidelines on Digestive System Cancers） were held in People＇s Medical Publishing House in January 28^th, 2016 （Figure 1）.
基金We are grateful to Professors Yijun Qi for providing the AGO1p::GFP-AGO1 seeds,Xuelu Wang for providing the 35S::BKI1-YFP seeds,Jianxiang Liu for providing the 35S::ER-mCherry plasmid,Hong Ma for providing theTOE1-Myc and mTOE1-Myc seeds,Xuemei Chen for providing the 35S::YFP-AGO1 plasmid,Shengben Li for providing the CSD2-HA and mCSD2-HA seeds,Fang Chang for providing the bri1-5 seeds,and Jinzhong Lin for providing ultracentrifuge equipment and technical guidance.This work was supported by grants of the National Natural Science Foundation of China(32025005,31830045,M-0398).
文摘Translational repression is a conserved mechanism in microRNA(miRNA)-guided gene silencing.In Arabidopsis,ARGONAUTE1(AGO1),the major miRNA effector,localizes in the cytoplasm for mRNA cleavage and at the endoplasmic reticulum(ER)for translational repression of target genes.However,the mechanism underlying miRNA-mediated translational repression is poorly understood.In particular,how the subcellular partitioning of AGO1 is regulated is largely unexplored.Here,we show that the plant hormone brassinosteroids(BRs)inhibit miRNA-mediated translational repression by negatively regulating the distribution of AGO1 at the ER in Arabidopsis thaliana.We show that the protein levels rather than the transcript levels of miRNA target genes were reduced in BR-deficient mutants but increased under BR treatments.The localization of AGO1 at the ER was significantly decreased under BR treatments while it was increased in the BR-deficient mutants.Moreover,ROTUNDIFOLIA3(ROT3),an enzyme involved in BR biosynthesis,co-localizes with AGO1 at the ER and interacts with AGO1 in a GW motif-dependent manner.Complementation analysis showed that the AGO1-ROT3 interaction is necessary for the function of ROT3.Our findings provide new clues to understand how miRNA-mediated gene silencing is regulated by plant endogenous hormones.
