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https://www.readbyqxmd.com/read/28326171/large-scale-isolation-and-cytotoxicity-of-extracellular-vesicles-derived-from-activated-human-natural-killer-cells
#1
Ambrose Y Jong, Chun-Hua Wu, Jingbo Li, Jianping Sun, Muller Fabbri, Alan S Wayne, Robert C Seeger
Extracellular vesicles (EVs) have been the focus of great interest, as they appear to be involved in numerous important cellular processes. They deliver bioactive macromolecules such as proteins, lipids, and nucleic acids, allowing intercellular communication in multicellular organisms. EVs are secreted by all cell types, including immune cells such as natural killer cells (NK), and they may play important roles in the immune system. Currently, a large-scale procedure to obtain functional NK EVs is lacking, limiting their use clinically...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28279219/tetraspanin-6-a-pivotal-protein-of-the-multiple-vesicular-body-determining-exosome-release-and-lysosomal-degradation-of-amyloid-precursor-protein-fragments
#2
Francesc X Guix, Ragna Sannerud, Fedor Berditchevski, Amaia M Arranz, Katrien Horré, An Snellinx, Amantha Thathiah, Takaomi Saido, Takashi Saito, Sundaresan Rajesh, Michael Overduin, Samir Kumar-Singh, Enrico Radaelli, Nikky Corthout, Julien Colombelli, Sébastien Tosi, Sebastian Munck, Isabel H Salas, Wim Annaert, Bart De Strooper
BACKGROUND: The mechanisms behind Aβ-peptide accumulation in non-familial Alzheimer's disease (AD) remain elusive. Proteins of the tetraspanin family modulate Aβ production by interacting to γ-secretase. METHODS: We searched for tetraspanins with altered expression in AD brains. The function of the selected tetraspanin was studied in vitro and the physiological relevance of our findings was confirmed in vivo. RESULTS: Tetraspanin-6 (TSPAN6) is increased in AD brains and overexpression in cells exerts paradoxical effects on Amyloid Precursor Protein (APP) metabolism, increasing APP-C-terminal fragments (APP-CTF) and Aβ levels at the same time...
March 10, 2017: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/28273451/interrogation-of-functional-cell-surface-markers-identifies-cd151-dependency-in-high-grade-serous-ovarian-cancer
#3
Mauricio Medrano, Laudine Communal, Kevin R Brown, Marcin Iwanicki, Josee Normand, Joshua Paterson, Fabrice Sircoulomb, Paul Krzyzanowski, Marian Novak, Sasha A Doodnauth, Fernando Suarez Saiz, Jane Cullis, Rima Al-Awar, Benjamin G Neel, John McPherson, Ronny Drapkin, Laurie Ailles, Anne-Marie Mes-Massons, Robert Rottapel
The degree of genetic aberrations characteristic of high-grade serous ovarian cancer (HGSC) makes identification of the molecular features that drive tumor progression difficult. Here, we perform genome-wide RNAi screens and comprehensive expression analysis of cell-surface markers in a panel of HGSC cell lines to identify genes that are critical to their survival. We report that the tetraspanin CD151 contributes to survival of a subset of HGSC cell lines associated with a ZEB transcriptional program and supports the growth of HGSC tumors...
March 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/28258189/selective-expression-of-tspan2-in-vascular-smooth-muscle-is-independently-regulated-by-tgf-%C3%AE-1-smad-and-myocardin-serum-response-factor
#4
Jinjing Zhao, Wen Wu, Wei Zhang, Yao Wei Lu, Emiley Tou, Jiemei Ye, Ping Gao, David Jourd'heuil, Harold A Singer, Mingfu Wu, Xiaochun Long
Tetraspanins (TSPANs) comprise a large family of 4-transmembrane domain proteins. The importance of TSPANs in vascular smooth muscle cells (VSMCs) is unexplored. Given that TGF-β1 and myocardin (MYOCD) are potent activators for VSMC differentiation, we screened for TGF-β1 and MYOCD/serum response factor (SRF)-regulated TSPANs in VSMC by using RNA-seq analyses and RNA-arrays. TSPAN2 was found to be the only TSPAN family gene induced by TGF-β1 and MYOCD, and reduced by SRF deficiency in VSMCs. We also found that TSPAN2 is highly expressed in smooth muscle-enriched tissues and down-regulated in in vitro models of VSMC phenotypic modulation...
March 3, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28254170/positive-and-negative-signals-in-mast-cell-activation
#5
REVIEW
Silvia Bulfone-Paus, Gunnar Nilsson, Petr Draber, Ulrich Blank, Francesca Levi-Schaffer
Mast cells are powerful immune modulators of the tissue microenvironment. Within seconds of activation, these cells release a variety of preformed biologically active products, followed by a wave of mediator synthesis and secretion. Increasing evidence suggests that an intricate network of inhibitory and activating receptors, specific signaling pathways, and adaptor proteins governs mast cell responsiveness to stimuli. Here, we discuss the biological and clinical relevance of negative and positive signaling modalities that control mast cell activation, with an emphasis on novel FcεRI regulators, immunoglobulin E (IgE)-independent pathways [e...
February 18, 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28251957/-contamination-of-exosome-preparations-isolated-from-biological-fluids
#6
A E Grigor'eva, N S Dyrkheeva, O E Bryzgunova, S N Tamkovich, B P Chelobanov, E I Ryabchikova
The aim of our study was to attract the attention of researchers at the problem of contamination of exosome preparations. Using a transmission electron microscope JEM-1400 ("JEOL", Japan) we have examined exosome preparations, isolated according to the conventional scheme of sequential centrifugation from different biological fluids: plasma and urine of healthy persons and patients with oncologic diseases, bovine serum, and culture fluid (MDCK, MDA-MB и MCF-7 cells). All exosome preparations (over 200) contained exosomes, which were identified by immuno-electron microscopy using antibodies to tetraspanins CD63 or CD9...
January 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/28223337/functional-expression-of-dopamine-d2-receptor-is-regulated-by-tetraspanin-7-mediated-postendocytic-trafficking
#7
Seol-Ae Lee, Yeongjun Suh, Saebom Lee, Jaehoon Jeong, Soo Jeong Kim, So Jung Kim, Sang Ki Park
The dopaminergic system plays an essential role in various functions of the brain, including locomotion, memory, and reward, and the deregulation of dopaminergic signaling as a result of altered functionality of dopamine D2 receptor (DRD2) is implicated in multiple neurologic and psychiatric disorders. Tetraspanin-7 (TSPAN7) is expressed to variable degrees in different tissues, with the highest level in the brain, and multiple mutations in TSPAN7 have been implicated in intellectual disability. Here, we tested the hypothesis that TSPAN7 may be a binding partner of DRD2 that is involved in the regulation of its functional activity...
February 21, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28215864/regulatory-effects-of-echinococcus-multilocularis-extracellular-vesicles-on-raw264-7-macrophages
#8
Yadong Zheng, Xiaola Guo, Meng Su, Aijiang Guo, Juntao Ding, Jing Yang, Haitao Xiang, Xiaoan Cao, Shaohua Zhang, Mazhar Ayaz, Xuenong Luo
Extracellular vesicles (EVs) play a role in intercellular communications via exchanging biological molecules, being involved in host-parasite interplay. Little is to date known about E. multilocularis EVs and their biological activities. Here spherical EVs secreted by E. multilocularis metacestodes were shown to range predominately from 34nm to 95nm in diameter. A total of 433 proteins were identified in the EVs, and the proteins involved in binding (42%) and catalytic activity (41%) were most frequently represented...
February 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28207852/tetraspanin-6-a-novel-regulator-of-hippocampal-synaptic-transmission-and-long-term-plasticity
#9
Isabel H Salas, Zsuzsanna Callaerts-Vegh, Amaia M Arranz, Francesc X Guix, Rudi D'Hooge, José A Esteban, Bart De Strooper, Carlos G Dotti
Tetraspanins (Tspan) are transmembrane proteins with important scaffold and signalling functions. Deletions of Tetraspanin 6 (Tspan6) gene, a member of the tetraspanin family, have been reported in patients with Epilepsy Female-restricted with Mental Retardation (EFMR). Interestingly, mutations in Tspan7, highly homologous to Tspan6, are associated with X-linked intellectual disability, suggesting that these two proteins are important for cognition. Considering recent evidences showing that Tspan7 plays a key role in synapse development and AMPAR trafficking, we initiated the study of Tspan6 in synaptic function using a Tspan6 knock out mouse model...
2017: PloS One
https://www.readbyqxmd.com/read/28194097/corrigendum-the-emerging-role-of-tetraspanins-in-the-proteolytic-processing-of-the-amyloid-precursor-protein
#10
Lisa Seipold, Paul Saftig
[This corrects the article on p. 149 in vol. 9, PMID: 28066176.].
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28192902/concentration-normalized-electroanalytical-assaying-of-exosomal-markers
#11
Qian Li, George K Tofaris, Jason J Davis
Exosomes are both active in mediating intracellular communication and potentially present a potent cargo of disease biomarkers to an assay. The robust evaluation of exosomal markers could lead to a paradigm shift in clinical analysis and associated care. To date, much of this has been hindered by issues of sample preparation and assay signal-to-noise. We introduce here the use of ultrasensitive electrochemical impedance spectroscopy to quantify both external (tetraspanin) and internal (syntenin) exosome-specific markers...
February 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192794/the-genetic-causes-of-nonsyndromic-congenital-retinal-detachment-a-genetic-and-phenotypic-study-of-pakistani-families
#12
Vafa Keser, Ayesha Khan, Sorath Siddiqui, Irma Lopez, Huanan Ren, Raheel Qamar, Javad Nadaf, Jacek Majewski, Rui Chen, Robert K Koenekoop
Purpose: To evaluate consanguineous pedigrees from Pakistan with a clinical diagnosis of nonsyndromic congenital retinal nonattachment (NCRNA) and identify genes responsible for the disease as currently only one NCRNA gene is known (atonal basic helix-loop-helix transcription factor 7: ATOH7). Methods: We implemented a three-step genotyping platform: single nucleotide polymorphism genotyping to identify loss of heterozygosity regions in patients, Retinal Information Network panel screening for mutations in currently known retinal genes...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28192514/correction-the-tetraspanin-associated-uroplakins-family-upk2-3-is-evolutionarily-related-to-ptprq-a-phosphotyrosine-phosphatase-receptor
#13
Javier U Chicote, Rob DeSalle, José Segarra, Tung-Tien Sun, Antonio García-España
[This corrects the article DOI: 10.1371/journal.pone.0170196.].
2017: PloS One
https://www.readbyqxmd.com/read/28188308/tetraspanin-8-is-a-novel-regulator-of-ilk-driven-%C3%AE-1-integrin-adhesion-and-signaling-in-invasive-melanoma-cells
#14
Manale El Kharbili, Clément Robert, Tiffany Witkowski, Emmanuelle Danty-Berger, Laetitia Barbollat-Boutrand, Ingrid Masse, Nicolas Gadot, Arnaud de la Fouchardière, Paul C McDonald, Shoukat Dedhar, François Le Naour, Françoise Degoul, Odile Berthier-Vergnes
Melanoma is well known for its propensity for lethal metastasis and resistance to most current therapies. Tumor progression and drug resistance depend to a large extent on the interplay between tumor cells and the surrounding matrix. We previously identified Tetraspanin 8 (Tspan8) as a critical mediator of melanoma invasion, whose expression is absent in healthy skin. The present study investigated whether Tspan8 may influence cell-matrix anchorage and regulate downstream molecular pathways leading to an aggressive behavior...
February 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28178752/prognostic-significance-of-cd9-expression-differs-between-tumor-cells-and-stromal-immune-cells-and-depends-on-the-molecular-subtype-of-the-invasive-breast-carcinoma
#15
Hee Jung Kwon, Jung Eun Choi, Su Hwan Kang, Youlim Son, Young Kyung Bae
AIMS: CD9, a tetraspanin transmembrane protein, modulates cell motility, migration, and proliferation. We investigated the prognostic significance of CD9 expression in patients with invasive breast carcinoma (IBC). METHODS AND RESULTS: CD9 expression was evaluated in tissue microarrays of 1349 IBC samples via immunohistochemistry. CD9 expression in tumor cells (T-CD9) and stromal immune cells (S-CD9) were analyzed separately. T-CD9 expression was observed in 732 (54...
February 8, 2017: Histopathology
https://www.readbyqxmd.com/read/28174692/the-specificity-of-homomeric-clustering-of-cd81-is-mediated-by-its-%C3%AE-loop
#16
Yahya Homsi, Thorsten Lang
Tetraspanins are cell membrane-scaffolding proteins interacting with one another and a repertoire of interaction partners. Through these interactions, they form extended molecular networks as tetraspanin webs or tetraspanin-enriched microdomains. Microscopic data suggest that these networks contain tetraspanin clusters, with poor overlap between clusters formed by different tetraspanins. Here, we investigate the possibility of targeting tetraspanins CD9 or CD151 to clusters formed by the tetraspanin CD81. We find that the δ-loop from the large extracellular domain of CD81 is sufficient for targeting of CD9/CD151 to CD81 clusters...
February 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28174663/chronic-lymphocytic-leukemia-with-clinical-debut-as-neurological-involvement-a-rare-phenomenon-and-the-need-for-better-predictive-markers
#17
Cristhiam M Rojas-Hernandez, Jacklyn Nemunaitis, Kristopher D Marjon, Daniel Bustamante, Qian-Yun Zhang, Jennifer M Gillette
BACKGROUND: Chronic lymphocytic leukemia (CLL) is the most common leukemia in Western countries. The frequency of symptomatic central nervous system (CNS) involvement is unknown but thought to be a rare phenomenon. Currently there are no known risk factors for CNS involvement. CASE PRESENTATION: We describe a clinically staged low-risk CLL case that presented with symptomatic CNS involvement and progressed rapidly to death. Evaluation of the surface adhesion molecules identified a markedly altered expression pattern of the integrin, CD49d, and the tetraspanin, CD82, in the index case when compared to similar low-risk CLL cases...
2017: BMC Hematology
https://www.readbyqxmd.com/read/28167787/up-regulation-of-cd81-inhibits-cytotrophoblast-invasion-and-mediates-maternal-endothelial-cell-dysfunction-in-preeclampsia
#18
Li Shen, Zhenyu Diao, Hai-Xiang Sun, Gui-Jun Yan, Zhiqun Wang, Ruo-Tian Li, Yimin Dai, Jingmei Wang, Jie Li, Hailing Ding, Guangfeng Zhao, Mingming Zheng, Pingping Xue, Mo Liu, Yan Zhou, Yali Hu
Preeclampsia (PE) is initiated by abnormal placentation in the early stages of pregnancy, followed by systemic activation of endothelial cells of the maternal small arterioles in the late second or third trimester (TM) of pregnancy. During normal pregnancy, placental cytotrophoblasts (CTBs) invade the maternal uterine wall and spiral arteries, whereas this process is interrupted in PE. However, it is not known how the malformed placenta triggers maternal endothelial crisis and the associated manifestations...
February 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28160150/exosomes-versus-microexosomes-shared-components-but-distinct-functions
#19
Kenji Miyado, Woojin Kang, Kenji Yamatoya, Maito Hanai, Akihiro Nakamura, Toshiyuki Mori, Mami Miyado, Natsuko Kawano
In multicellular organisms, cellular components are constantly translocated within cells and are also transported exclusively between limited cells, regardless of their physical distance. Exosomes function as one of the key mediators of intercellular transportation. External vesicles were identified 50 years ago in plants and now reconsidered to be exosome-like vesicles. Meanwhile, a well-known exosomal component, tetraspanin CD9, regulates sperm-egg fusion in mammals. A number of Arabidopsis tetraspanins are also expressed in reproductive tissues at fertilization, and are localized at the plasma membrane of protoplasts...
February 3, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28102751/extracellular-vesicles-from-activated-platelets-a-semiquantitative-cryo-electron-microscopy-and-immuno-gold-labeling-study
#20
Alain R Brisson, Sisareuth Tan, Romain Linares, Céline Gounou, Nicolas Arraud
Cells release membrane vesicles in their surrounding medium either constitutively or in response to activating signals. Two main types of extracellular vesicles (EVs) are commonly distinguished based on their mechanism of formation, membrane composition and size. According to the current model, EVs shed from the plasma membrane, often called microvesicles, expose phosphatidylserine (PS) and range in size from 100 nm to 1 µm, while EVs originating from endosomal multi-vesicular bodies, called exosomes, contain tetraspanin proteins, including CD63, and range in size from 50 to 100 nm...
January 19, 2017: Platelets
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