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https://www.readbyqxmd.com/read/27913206/mag-fluo4-in-t-cells-imaging-of-intra-organelle-free-ca-2-concentrations
#1
Björn-Philipp Diercks, Ralf Fliegert, Andreas H Guse
Ca(2+) signaling is a major signal transduction pathway involved in T cell activation, but also in apoptosis of T cells. Since T cells make use of several Ca(2+)-mobilizing second messengers, such as nicotinic acid adenine dinucleotide phosphate, d-myo-inositol 1,4,5-trisphosphate, and cyclic ADP-ribose, we intended to analyze luminal Ca(2+) concentration upon cell activation. Mag-Fluo4/AM, a low-affinity Ca(2+) dye known to localize to the endoplasmic reticular lumen in many cell types, showed superior brightness and bleaching stability, but, surprisingly, co-localized with mito-tracker, but not with ER-tracker in Jurkat T cells...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27599388/mapping-optimal-charge-density-and-length-of-romp-based-ptdms-for-sirna-internalization
#2
Leah M Caffrey, Brittany M deRonde, Lisa M Minter, Gregory N Tew
A fundamental understanding of how polymer structure impacts internalization and delivery of biologically relevant cargoes, particularly small interfering ribonucleic acid (siRNA), is of critical importance to the successful design of improved delivery reagents. Herein we report the use of ring-opening metathesis polymerization (ROMP) methods to synthesize two series of guanidinium-rich protein transduction domain mimics (PTDMs): one based on an imide scaffold that contains one guanidinium moiety per repeat unit, and another based on a diester scaffold that contains two guanidinium moieties per repeat unit...
October 10, 2016: Biomacromolecules
https://www.readbyqxmd.com/read/27560372/d186-d190-is-an-allele-dependent-determinant-of-hiv-1-nef-function
#3
Andrea Imle, Bettina Stolp, Verena Böhmer, Matthias Geyer, Erez Raz, Oliver T Fackler
The HIV-1 pathogenesis factor Nef interacts with numerous ligands to affect cellular vesicular transport, signal transduction and cytoskeletal dynamics. While most Nef functions depend on multivalent protein interaction motifs, disrupting actin dynamics requires a motif that specifically recruits the host kinase PAK2. An adjacent aspartate was recently predicted to mediate Nef-β-catenin interactions. We report here that β-catenin can be co-immunoprecipitated with Nef.GFP from Jurkat T cell lysates. This association is conserved among lentiviral Nef proteins but does not involve classical Nef protein interaction motifs, including the critical aspartate...
November 2016: Virology
https://www.readbyqxmd.com/read/27556228/microrna-144-regulates-cancer-cell-proliferation-and-cell-cycle-transition-in-acute-lymphoblastic-leukemia-through-the-interaction-of-fmn2
#4
Jie Jin, Yu Wang, Yang Xu, Xu Zhou, Yu Liu, Xiang Li, Jin Wang
BACKGROUND: In this study, we explored the functional roles of microRNA-144 (miR-144) upregulation and downregulation in human acute lymphoblastic leukemia (ALL). METHOD: Gene expression of miR-144 was examined by qRT-PCR in both ALL cell lines and T-leukemic cells of ALL patients. In ALL cell lines Molt-3 and Jurkat cells, miR-144 was either upregulated or downregulated through lentiviral transduction. The subsequent effects of miR-144 upregulation or downregulation on ALL proliferation, cell-cycle transition, and in vivo xenograft were assessed...
August 24, 2016: Journal of Gene Medicine
https://www.readbyqxmd.com/read/27504737/the-induction-of-cxcr4-expression-in-human-osteoblast-like-cells-mg63-by-cocr-particles-is-regulated-by-the-plc-dag-pkc-pathway
#5
Andreas Drynda, Qiang Ren, Gottfried H Buchhorn, Christoph H Lohmann
BACKGROUND: Osteolysis which leads to aseptic loosening of implants is a fundamental problem in joint replacement surgery (arthroplasty) and the leading cause for implant failure and revision surgery. Metal (CoCr) particles separated from implants by wear cause osteolysis and the failure of orthopedic implants, but the molecular mechanism is not clear. The chemokine receptor CXCR4 has been shown to play a pivotal role in periprosthetic osteolysis. The aim of this study was to determine which signal transduction pathway (PLC-DAG-PKC or MAPK/ERK) induces CXCR4 expression in osteoblast-like cells (MG63) cells...
August 9, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27408928/microarray-dataset-of-jurkat-cells-following-mir-93-over-expression
#6
Silvia Gioiosa, Lorena Verduci, Gianluca Azzalin, Claudia Carissimi, Valerio Fulci, Giuseppe Macino
The dataset presented here represents a microarray experiment of Jurkat cell line over-expressing miR-93 after lentiviral transgenic construct transduction. Three biological replicates have been performed. We further provide normalized and processed data, log2 Fold Change based ranked list and GOterms resulting table. The raw microarray data are available in the ArrayExpress database (www.ebi.ac.uk/arrayexpress) under accession number ArrayExpress: E-MTAB-4588.
September 2016: Data in Brief
https://www.readbyqxmd.com/read/27390612/transduction-of-recombinant-m3-p53-r12-protein-enhances-human-leukemia-cell-apoptosis
#7
Tsung Chi Lu, Guan-Hao Zhao, Yao Yun Chen, Chia-Ying Chien, Chi-Hung Huang, Kwang Hui Lin, Shen Liang Chen
Tumor suppressor protein p53 plays important roles in initiating cell cycle arrest and promoting tumor cell apoptosis. Previous studies have shown that p53 is either mutated or defective in approximately 50% of human cancers; therefore restoring normal p53 activity in cancer cells might be an effective anticancer therapeutic approach. Herein, we designed a chimeric p53 protein flanked with the MyoD N-terminal transcriptional activation domain (amino acids 1-62, called M3) and a poly-arginine (R12) cell penetrating signal in its N-and C-termini respectively...
2016: Journal of Cancer
https://www.readbyqxmd.com/read/27387771/intracellular-labile-iron-determines-h2o2-induced-apoptotic-signaling-via-sustained-activation-of-ask1-jnk-p38-axis
#8
M D Mantzaris, S Bellou, V Skiada, N Kitsati, T Fotsis, D Galaris
Hydrogen peroxide (H2O2) acts as a second messenger in signal transduction participating in several redox regulated pathways, including cytokine and growth factor stimulated signals. However, the exact molecular mechanisms underlying these processes remain poorly understood and require further investigation. In this work, using Jurkat T lymphoma cells and primary human umbilical vein endothelial cells, it was observed that changes in intracellular "labile iron" were able to modulate signal transduction in H2O2-induced apoptosis...
August 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27114702/andrographolide-inhibits-growth-of-human-t-cell-acute-lymphoblastic-leukemia-jurkat-cells-by-downregulation-of-pi3k-akt-and-upregulation-of-p38-mapk-pathways
#9
Tingfang Yang, Shuluan Yao, Xianfeng Zhang, Yan Guo
T-cell acute lymphoblastic leukemia (T-ALL) as a prevalent hematologic malignancy is one of the most common malignant tumors worldwide in children. Andrographolide (Andro), the major active component from Andrographis paniculata, has been shown to possess antitumor activities in several types of cancer cells. However, whether Andro would inhibit T-ALL cell growth remains unclear. In this study, we investigated the cytotoxic effect of Andro on human T-ALL Jurkat cells and explored the mechanisms of cell death...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27107742/sam68-affects-cell-proliferation-and-apoptosis-of-human-adult-t-acute-lymphoblastic-leukemia-cells-via-akt-mtor-signal-pathway
#10
Qi Wang, Yuanye Li, Jingying Cheng, Long Chen, Hua Xu, Qinghua Li, Tianxiang Pang
Sam68 (Src associated in mitosis, 68kDa) belongs to the signal,transduction and activation of RNA (STAR) family and its function has been linked to the onset and progression of many tumors. However, the role of Sam68 in T-acute lymphoblastic leukemia (T-ALL) remains unclear. This present study aimed to investigate whether and how Sam68 involved in T-ALL. Our results showed high expression of Sam68 in adult T-ALL cases, Jurkat and CCRF-CEM cell lines. Knockdown of Sam68 repressed cell proliferation, increased apoptosis, induced S arrest along with upregulation of p21, Bad, cleaved caspase-9, caspase-3, PARP and downregulation of CDK2 and Bcl-xl...
July 2016: Leukemia Research
https://www.readbyqxmd.com/read/27103189/optimal-hydrophobicity-in-ring-opening-metathesis-polymerization-based-protein-mimics-required-for-sirna-internalization
#11
Brittany M deRonde, Nicholas D Posey, Ronja Otter, Leah M Caffrey, Lisa M Minter, Gregory N Tew
Exploring the role of polymer structure for the internalization of biologically relevant cargo, specifically siRNA, is of critical importance to the development of improved delivery reagents. Herein, we report guanidinium-rich protein transduction domain mimics (PTDMs) based on a ring-opening metathesis polymerization scaffold containing tunable hydrophobic moieties that promote siRNA internalization. Structure-activity relationships using Jurkat T cells and HeLa cells were explored to determine how the length of the hydrophobic block and the hydrophobic side chain compositions of these PTDMs impacted siRNA internalization...
June 13, 2016: Biomacromolecules
https://www.readbyqxmd.com/read/27057542/a-crispr-based-toolbox-for-studying-t-cell-signal-transduction
#12
Shen Chi, Arthur Weiss, Haopeng Wang
CRISPR/Cas9 system is a powerful technology to perform genome editing in a variety of cell types. To facilitate the application of Cas9 in mapping T cell signaling pathways, we generated a toolbox for large-scale genetic screens in human Jurkat T cells. The toolbox has three different Jurkat cell lines expressing distinct Cas9 variants, including wild-type Cas9, dCas9-KRAB, and sunCas9. We demonstrated that the toolbox allows us to rapidly disrupt endogenous gene expression at the DNA level and to efficiently repress or activate gene expression at the transcriptional level...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27056844/phase-separation-of-signaling-molecules-promotes-t-cell-receptor-signal-transduction
#13
Xiaolei Su, Jonathon A Ditlev, Enfu Hui, Wenmin Xing, Sudeep Banjade, Julia Okrut, David S King, Jack Taunton, Michael K Rosen, Ronald D Vale
Activation of various cell surface receptors triggers the reorganization of downstream signaling molecules into micrometer- or submicrometer-sized clusters. However, the functional consequences of such clustering have been unclear. We biochemically reconstituted a 12-component signaling pathway on model membranes, beginning with T cell receptor (TCR) activation and ending with actin assembly. When TCR phosphorylation was triggered, downstream signaling proteins spontaneously separated into liquid-like clusters that promoted signaling outputs both in vitro and in human Jurkat T cells...
April 29, 2016: Science
https://www.readbyqxmd.com/read/27028870/an-optimized-single-chain-tcr-scaffold-relying-on-the-assembly-with-the-native-cd3-complex-prevents-residual-mispairing-with-endogenous-tcrs-in-human-t-cells
#14
Diana Knies, Sebastian Klobuch, Shao-An Xue, Matthias Birtel, Hakim Echchannaoui, Oezlem Yildiz, Tana Omokoko, Philippe Guillaume, Pedro Romero, Hans Stauss, Ugur Sahin, Wolfgang Herr, Matthias Theobald, Simone Thomas, Ralf-Holger Voss
Immunotherapy of cancer envisions the adoptive transfer of T-cells genetically engineered with tumor-specific heterodimeric α/β T-cell receptors (TCRα/β). However, potential mispairing of introduced TCRα/β-chains with endogenous β/α-ones may evoke unpredictable autoimmune reactivities. A novel single chain (sc)TCR format relies on the fusion of the Vα-Linker-Vβ-fragment to the TCR Cβ-domain and coexpression of the TCR Cα-domain capable of recruiting the natural CD3-complex for full and hence, native T-cell signaling...
April 19, 2016: Oncotarget
https://www.readbyqxmd.com/read/26888964/src-kinases-central-to-t-cell-receptor-signaling-regulate-tlr-activated-innate-immune-responses-from-human-t-cells
#15
Naveen Sharma, Ajay Suresh Akhade, Ayub Qadri
TLRs have a fundamental role in immunity. We have recently reported that stimulation of TLR2 and TLR5 in freshly isolated and activated human T cells with microbial ligands without concomitant activation through the TCR brings about secretion of neutrophil chemoattractant, CXCL8, and effector cytokine, IFN-γ, respectively. However, the mechanism of TLR signaling in T cells has not been worked out. Here, we show that the Src family kinases, p56(lck)(Lck) and p59(fyn)(Fyn), which are essential for activation of T cells through the TCR, are also critical for signal transduction through TLRs in human T cells...
April 2016: Innate Immunity
https://www.readbyqxmd.com/read/26800572/conditional-cytotoxic-anti-hiv-gene-therapy-for-selectable-cell-modification
#16
Himanshu Garg, Anjali Joshi
Gene therapy remains one of the potential strategies to achieve a cure for HIV infection. One of the major limitations of anti-HIV gene therapy concerns recovering an adequate number of modified cells to generate an HIV-proof immune system. Our study addresses this issue by developing a methodology that can mark conditional vector-transformed cells for selection and subsequently target HIV-infected cells for elimination by treatment with ganciclovir (GCV). We used the herpes simplex virus thymidine kinase (TK) mutant SR39, which is highly potent at killing cells at low GCV concentrations...
May 2016: Human Gene Therapy
https://www.readbyqxmd.com/read/26792730/in-vivo-regulation-of-human-crkii-by-cyclophilin-a-and-fk506-binding-protein
#17
Pulak Ranjan Nath, Guangyu Dong, Alex Braiman, Noah Isakov
Members of the Crk family of adaptor proteins are key players in signal transduction from a variety of cell surface receptors. CrkI and CrkII are two alternative-spliced forms of a single gene which possess an N-terminal SH2 domain and an SH3 domain that mediate interaction with other proteins. CrkII possesses an additional C-terminal linker region plus an extra SH3 domain, which does not interact with other proteins, but operates as regulatory moiety. Utilizing human Jurkat T cells, we demonstrate that CrkII-SH3N binding of C3G is inhibited by cyclosporin A (CsA) plus FK506 that inhibit the cyclophilin A (CypA) and FK506 binding protein (FKBP) peptidyl-prolyl cis-trans isomerases (PPIases; also termed immunophilins), respectively...
February 5, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/26735495/her-specific-tkis-exert-their-antineoplastic-effects-on-breast-cancer-cell-lines-through-the-involvement-of-stat5-and-jnk
#18
Daphne Gschwantler-Kaulich, Thomas W Grunt, Daniela Muhr, Renate Wagner, Heinz Kölbl, Christian F Singer
BACKGROUND: HER-targeted tyrosine kinase inhibitors (TKIs) have demonstrated pro-apoptotic and antiproliferative effects in vitro and in vivo. The exact pathways through which TKIs exert their antineoplastic effects are, however, still not completely understood. METHODS: Using Milliplex assays, we have investigated the effects of the three panHER-TKIs lapatinib, canertinib and afatinib on signal transduction cascade activation in SKBR3, T47D and Jurkat neoplastic cell lines...
2016: PloS One
https://www.readbyqxmd.com/read/26557148/mechanistic-study-of-the-phytocompound-2-%C3%AE-d-glucopyranosyloxy-1-hydroxytrideca-5-7-9-11-tetrayne-in-human-t-cell-acute-lymphocytic-leukemia-cells-by-using-combined-differential-proteomics-and-bioinformatics-approaches
#19
Jeng-Yuan Shiau, Shu-Yi Yin, Shu-Lin Chang, Yi-Jou Hsu, Kai-Wei Chen, Tien-Fen Kuo, Ching-Shan Feng, Ning-Sun Yang, Lie-Fen Shyur, Wen-Chin Yang, Tuan-Nan Wen
Bidens pilosa, a medicinal herb worldwide, is rich in bioactive polyynes. In this study, by using high resolution 2-dimensional gel electrophoresis coupled with mass spectrometry analysis, as many as 2000 protein spots could be detected and those whose expression was specifically up- or downregulated in Jurkat T cells responsive to the treatment with 2-β-D-glucopyranosyloxy-1-hydroxytrideca-5,7,9,11-tetrayne (GHTT) can be identified. GHTT treatment can upregulate thirteen proteins involved in signal transduction, detoxification, metabolism, energy pathways, and channel transport in Jurkat cells...
2015: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/26448723/analysis-of-the-expression-of-phtf1-and-related-genes-in-acute-lymphoblastic-leukemia
#20
Xin Huang, Suxia Geng, Jianyu Weng, Zesheng Lu, Lingji Zeng, Minming Li, Chengxin Deng, Xiuli Wu, Yangqiu Li, Xin Du
BACKGROUND: Previous study showed that downregulated BCL11B expression in T cell acute lymphoblastic leukemia (T-ALL) cell line Molt-4 inhibited cell proliferation and induce apoptosis, which may be related to PHTF1 gene overexpression. The objective of this study was to investigate the expression of PHTF1 and related genes in ALL and further explore its function in T-ALL cell lines. METHODS: Real-time PCR was used to determine the gene expression level of PHTF1 in hematologic malignancies...
2015: Cancer Cell International
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