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https://www.readbyqxmd.com/read/29760699/tetraspanin-cd9-a-key-regulator-of-cell-adhesion-in-the-immune-system
#1
REVIEW
Raquel Reyes, Beatriz Cardeñes, Yesenia Machado-Pineda, Carlos Cabañas
The tetraspanin CD9 is expressed by all the major subsets of leukocytes (B cells, CD4+ T cells, CD8+ T cells, natural killer cells, granulocytes, monocytes and macrophages, and immature and mature dendritic cells) and also at a high level by endothelial cells. As a typical member of the tetraspanin superfamily, a prominent feature of CD9 is its propensity to engage in a multitude of interactions with other tetraspanins as well as with different transmembrane and intracellular proteins within the context of defined membranal domains termed tetraspanin-enriched microdomains (TEMs)...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29760697/hookworm-secreted-extracellular-vesicles-interact-with-host-cells-and-prevent-inducible-colitis-in-mice
#2
Ramon M Eichenberger, Stephanie Ryan, Linda Jones, Geraldine Buitrago, Ramona Polster, Marcela Montes de Oca, Jennifer Zuvelek, Paul R Giacomin, Lindsay A Dent, Christian R Engwerda, Matthew A Field, Javier Sotillo, Alex Loukas
Gastrointestinal (GI) parasites, hookworms in particular, have evolved to cause minimal harm to their hosts, allowing them to establish chronic infections. This is mediated by creating an immunoregulatory environment. Indeed, hookworms are such potent suppressors of inflammation that they have been used in clinical trials to treat inflammatory bowel diseases (IBD) and celiac disease. Since the recent description of helminths (worms) secreting extracellular vesicles (EVs), exosome-like EVs from different helminths have been characterized and their salient roles in parasite-host interactions have been highlighted...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29760691/extracellular-vesicle-heterogeneity-subpopulations-isolation-techniques-and-diverse-functions-in-cancer-progression
#3
REVIEW
Eduard Willms, Carlos Cabañas, Imre Mäger, Matthew J A Wood, Pieter Vader
Cells release membrane enclosed nano-sized vesicles termed extracellular vesicles (EVs) that function as mediators of intercellular communication by transferring biological information between cells. Tumor-derived EVs have emerged as important mediators in cancer development and progression, mainly through transfer of their bioactive content which can include oncoproteins, oncogenes, chemokine receptors, as well as soluble factors, transcripts of proteins and miRNAs involved in angiogenesis or inflammation...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29760437/cd82-hypomethylation-is-essential-for-tuberculosis-pathogenesis-via-regulation-of-runx1-rab5-22
#4
Hyun-Jung Koh, Ye-Ram Kim, Jae-Sung Kim, Jin-Seung Yun, Sojin Kim, Sun Young Kim, Kiseok Jang, Chul-Su Yang
The tumor suppressor gene CD82/KAI1 is a member of the tetraspanin superfamily and organizes various membrane-based processes. Mycobacterium tuberculosis (MTB) persists in host macrophages by interfering with phagolysosome biogenesis and inflammatory responses, but the role of CD82 in controlling the intracellular survival of pathogenic mycobacteria within macrophages remains poorly understood. In this study, we demonstrated that the virulent MTB strain H37Rv (MTB Rv) induced CD82 promoter hypomethylation, resulting in CD82 expression...
May 14, 2018: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/29750314/screening-of-differentially-expressed-genes-in-male-idiopathic-osteoporosis-via-rna-sequencing
#5
Li Feng, Yan Wang, Jing Zhou, Baofang Tian, Bo Xia
As a type of osteoporosis (OP), male idiopathic OP (MIO) is a bone disorder that occurs in young males and is a public health problem worldwide. However, the detailed pathogenesis of MIO remains to be elucidated. In the present study, blood samples of patients with MIO, senile OP, postmenopausal OP and normal controls (NCs) were obtained for RNA sequencing. Compared with the NC group, differentially expressed genes (DEGs) in the three types of OP were identified. DEGs that were common among the three types of OP and the DEGs that were unique to patients with MIO were determined...
May 7, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29723143/-the-role-of-exosomal-tetraspanins-and-proteases-in-tumor-progression
#6
REVIEW
N V Yunusova, E A Tugutova, S N Tamkovich, I V Kondakova
Major (CD9, CD63, CD81) and others (CD82, CD151, Tspan8) tetraspanins are widely represented in exosomes, where they interact with various proteins and form functional tetraspanin complexes. Tetraspanin complexes include proteases. Tetraspanin-associated exosomal proteases (ADAM proteases, MMPs, EMMPRIN) play an important role in the processes of cell motility, migration, invasion and formation of metastases. Also, a significant contribution to tumor progression is made by proteases that are not associated with tetraspanins...
March 2018: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/29720199/immunoassays-for-scarce-tumour-antigens-in-exosomes-detection-of-the-human-nkg2d-ligand-mica-in-tetraspanin-containing-nanovesicles-from-melanoma
#7
Sheila López-Cobo, Carmen Campos-Silva, Amanda Moyano, Myriam Oliveira-Rodríguez, Annette Paschen, María Yáñez-Mó, María Carmen Blanco-López, Mar Valés-Gómez
BACKGROUND: Tumour-derived exosomes can be released to serum and provide information on the features of the malignancy, however, in order to perform systematic studies in biological samples, faster diagnostic techniques are needed, especially for detection of low abundance proteins. Most human cancer cells are positive for at least one ligand for the activating immune receptor NKG2D and the presence in plasma of NKG2D-ligands can be associated with prognosis. METHODS: Using MICA as example of a tumour-derived antigen, endogenously expressed in metastatic melanoma and recruited to exosomes, we have developed two immunocapture-based assays for detection of different epitopes in nanovesicles...
May 2, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29715484/b-cell-mhc-class-ii-signaling-a-story-of-life-and-death
#8
REVIEW
Divya Sai Katikaneni, Lei Jin
MHC class II regulates B cell activation, proliferation, and differentiation during cognate B cell -T cell interaction. This is, in part, due to the MHC class II signaling in B cells. Activation of MHC Class II in human B cells or "primed" murine B cells leads to tyrosine phosphorylation, calcium mobilization, AKT, ERK, JNK activation. In addition, crosslinking MHC class II with monoclonal Abs kill malignant human B cells. Several humanized anti-HLA-DR/MHC class II monoclonal Abs entered clinical trials for lymphoma/leukemia and MHC class II-expressing melanomas...
April 28, 2018: Human Immunology
https://www.readbyqxmd.com/read/29707602/enhanced-production-of-exosome-associated-aav-by-overexpression-of-the-tetraspanin-cd9
#9
Lara Timantra Schiller, Nicolás Lemus-Diaz, Rafael Rinaldi Ferreira, Kai Oliver Böker, Jens Gruber
Research on cell-free vesicles revealed a multitude of characteristics, in particular of microvesicles and exosomes, that range from their potential as biomarkers to a function in horizontal transfer of genetic information from cell to cell and also include supportive functions in viral infection. Exosome-associated adeno-associated viruses (exo-AAVs) are of particular interest for the past couple of years, because they introduced a new source of highly potent recombinant AAVs with improved features, including accelerated transduction rates and more efficient immune escape...
June 15, 2018: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/29696536/transgenic-up-regulation-of-claudin-6-decreases-fine-diesel-particulate-matter-dpm-induced-pulmonary-inflammation
#10
Joshua B Lewis, Jared S Bodine, Jason R Gassman, Samuel Arce Muñoz, Dallin C Milner, Todd M Dunaway, Kaleb M Egbert, Troy D Monson, Dallin S Broberg, Juan A Arroyo, Paul R Reynolds
Claudin-6 (Cldn6) is a tetraspanin transmembrane protein that contributes to tight junctional complexes and has been implicated in the maintenance of lung epithelial barriers. In the present study, we tested the hypothesis that genetic up-regulation of Cldn-6 influences inflammation in mice exposed to short-term environmental diesel particulate matter (DPM). Mice were subjected to ten exposures of nebulized DPM (PM2.5) over a period of 20 days via a nose-only inhalation system (Scireq, Montreal, Canada). Using real-time RT-PCR, we discovered that the Cldn6 gene was up-regulated in control mice exposed to DPM and in lung-specific transgenic mice that up-regulate Cldn-6 (Cldn-6 TG)...
April 25, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29679260/slow-release-of-hiv-1-protein-nef-from-vesicle-like-structures-is-inhibited-by-cytosolic-calcium-elevation-in-single-human-microglia
#11
Matjaž Stenovec, Eva Lasič, Pia Pužar Dominkuš, Saša Trkov Bobnar, Robert Zorec, Metka Lenassi, Marko Kreft
Once infected by HIV-1, microglia abundantly produce accessory protein Nef that enhances virus production and infectivity, but little is known about its intracellular compartmentalization, trafficking mode(s), and release from microglia. Here, we transfected immortalized human microglia with a plasmid encoding Nef tagged with green fluorescent protein (Nef.GFP) to biochemically and microscopically identify Nef.GFP-associated cellular compartments and examine their mobility and Nef release from cultured cells...
April 21, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29677132/cd81-receptor-regions-outside-the-large-extracellular-loop-determine-hepatitis-c-virus-entry-into-hepatoma-cells
#12
Pia Banse, Rebecca Moeller, Janina Bruening, Lisa Lasswitz, Sina Kahl, Abdul G Khan, Joseph Marcotrigiano, Thomas Pietschmann, Gisa Gerold
Hepatitis C virus (HCV) enters human hepatocytes using four essential entry factors, one of which is human CD81 (hCD81). The tetraspanin hCD81 contains a large extracellular loop (LEL), which interacts with the E2 glycoprotein of HCV. The role of the non-LEL regions of hCD81 (intracellular tails, four transmembrane domains, small extracellular loop and intracellular loop) is poorly understood. Here, we studied the contribution of these domains to HCV susceptibility of hepatoma cells by generating chimeras of related tetraspanins with the hCD81 LEL...
April 20, 2018: Viruses
https://www.readbyqxmd.com/read/29671763/cd9-and-cd81-interactions-and-their-structural-modelling-in-sperm-prior-to-fertilization
#13
Michaela Frolikova, Pavla Manaskova-Postlerova, Jiri Cerny, Jana Jankovicova, Ondrej Simonik, Alzbeta Pohlova, Petra Secova, Jana Antalikova, Katerina Dvorakova-Hortova
Proteins CD9 and CD81 are members of the tetraspanin superfamily and were detected in mammalian sperm, where they are suspected to form an active tetraspanin web and to participate in sperm⁻egg membrane fusion. The importance of these two proteins during the early stages of fertilization is supported by the complete sterility of CD9/CD81 double null female mice. In this study, the putative mechanism of CD9/CD81 involvement in tetraspanin web formation in sperm and its activity prior to fertilization was addressed...
April 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29662628/a-gene-expression-signature-predicts-recurrence-free-survival-in-meningioma
#14
Adriana Olar, Lindsey D Goodman, Khalida M Wani, Nicholas S Boehling, Devi S Sharma, Reema R Mody, Joy Gumin, Elizabeth B Claus, Frederick F Lang, Timothy F Cloughesy, Albert Lai, Kenneth D Aldape, Franco DeMonte, Erik P Sulman
BACKGROUND: Meningioma is the most common primary brain tumor and has a variable risk of local recurrence. While World Health Organization (WHO) grade generally correlates with recurrence, there is substantial within-grade variation of recurrence risk. Current risk stratification does not accurately predict which patients are likely to benefit from adjuvant radiation therapy (RT). We hypothesized that tumors at risk for recurrence have unique gene expression profiles (GEP) that could better select patients for adjuvant RT...
March 23, 2018: Oncotarget
https://www.readbyqxmd.com/read/29650964/tspan15-interacts-with-btrc-to-promote-oesophageal-squamous-cell-carcinoma-metastasis-via-activating-nf-%C3%AE%C2%BAb-signaling
#15
Baozhu Zhang, Zhao Zhang, Lei Li, Yan-Ru Qin, Haibo Liu, Chen Jiang, Ting-Ting Zeng, Meng-Qing Li, Dan Xie, Yan Li, Xin-Yuan Guan, Ying-Hui Zhu
Beta-transducin repeat containing E3 ubiquitin protein ligase (BTRC) is crucial for the degradation of IκBα. Our previous transcriptome sequencing analysis revealed that tetraspanin 15 (TSPAN15) was significantly upregulated in clinical oesophageal squamous cell carcinoma (OSCC) tissues. Here, we show that high TSPAN15 expression in OSCC tissues is significantly associated with lymph node and distant metastasis, advanced clinical stage, and poor prognosis. Elevated TSPAN15 expression is, in part, caused by the reduction of miR-339-5p...
April 12, 2018: Nature Communications
https://www.readbyqxmd.com/read/29593411/imaging-of-extracellular-vesicles-derived-from-human-bone-marrow-mesenchymal-stem-cells-using-fluorescent-and-magnetic-labels
#16
Sylwia Dabrowska, Andrea Del Fattore, Elzbieta Karnas, Malgorzata Frontczak-Baniewicz, Hanna Kozlowska, Maurizio Muraca, Miroslaw Janowski, Barbara Lukomska
Background: Mesenchymal stem cells have been shown therapeutic in various neurological disorders. Recent studies support the notion that the predominant mechanism by which MSCs act is through the release of extracellular vesicles (EVs). EVs seem to have similar therapeutic activity as their cellular counterparts and may represent an interesting alternative standalone therapy for various diseases. The aim of the study was to optimize the method of EV imaging to better understand therapeutic effects mediated by EVs...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29589089/tetraspanin-enriched-microdomains-regulate-digitation-junctions
#17
Chao Huang, Chenying Fu, Jonathan D Wren, Xuejun Wang, Feng Zhang, Yanhui H Zhang, Samuel A Connel, Taosheng Chen, Xin A Zhang
Tetraspanins co-emerged with multi-cellular organisms during evolution are typically localized at the cell-cell interface, and form tetraspanin-enriched microdomains (TEMs) by associating with each other and other membrane molecules. Tetraspanins affect various biological functions, but how tetraspanins engage in multi-faceted functions at the cellular level is largely unknown. When cells interact, the membrane microextrusions at the cell-cell interfaces form dynamic, digit-like structures between cells, which we term digitation junctions (DJs)...
March 27, 2018: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29575602/exosomal-tetraspanins-as-regulators-of-cancer-progression-and-metastasis-and-novel-diagnostic-markers
#18
REVIEW
Rama Rao Malla, Santhi Pandrangi, Seema Kumari, Murali Mohan Gavara, Anil Kumar Badana
Exosomes are cell-cell communicators emerging as a new paradigm for noninvasive diagnosis and prognosis of treatment response. Exosomal tetraspanin proteins like CD63, CD9 and CD81 play a critical role in sorting, selective recruitment of biomolecules, target selection, cell-specific entry, capturing, angiogenesis and vasculogenesis. These tetraspanins are being used as markers for oral, colorectal and colon cancers and glioblastoma. However, exosomal markers with robust specificity for early detection of carcinomas are the furthest along...
March 25, 2018: Asia-Pacific Journal of Clinical Oncology
https://www.readbyqxmd.com/read/29572511/double-deletion-of-tetraspanins-cd9-and-cd81-in-mice-leads-to-a-syndrome-resembling-accelerated-aging
#19
Yingji Jin, Yoshito Takeda, Yasushi Kondo, Lokesh P Tripathi, Sujin Kang, Hikari Takeshita, Hanako Kuhara, Yohei Maeda, Masayoshi Higashiguchi, Kotaro Miyake, Osamu Morimura, Taro Koba, Yoshitomo Hayama, Shohei Koyama, Kaori Nakanishi, Takeo Iwasaki, Satoshi Tetsumoto, Kazuyuki Tsujino, Muneyoshi Kuroyama, Kota Iwahori, Haruhiko Hirata, Takayuki Takimoto, Mayumi Suzuki, Izumi Nagatomo, Ken Sugimoto, Yuta Fujii, Hiroshi Kida, Kenji Mizuguchi, Mari Ito, Takashi Kijima, Hiromi Rakugi, Eisuke Mekada, Isao Tachibana, Atsushi Kumanogoh
Chronic obstructive pulmonary disease (COPD) has been recently characterized as a disease of accelerated lung aging, but the mechanism remains unclear. Tetraspanins have emerged as key players in malignancy and inflammatory diseases. Here, we found that CD9/CD81 double knockout (DKO) mice with a COPD-like phenotype progressively developed a syndrome resembling human aging, including cataracts, hair loss, and atrophy of various organs, including thymus, muscle, and testis, resulting in shorter survival than wild-type (WT) mice...
March 23, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29568359/cd151-promotes-cell-metastasis-via-activating-tgf-%C3%AE-1-smad-signaling-in-renal-cell-carcinoma
#20
Yajie Yu, Chao Liang, Shangqian Wang, Jundong Zhu, Chenkui Miao, Yibo Hua, Meiling Bao, Qiang Cao, Chao Qin, Pengfei Shao, Zengjun Wang
Tetraspanin CD151 has been identified as a tumor promoter, which is upregulated in various malignant cell types. However, the function of CD151 and its underlying mechanism in renal cell carcinoma is still unknown. In this study, we detected the expression of CD151 in RCC cells and tissues and explored its regulatory mechanism. We found that CD151 was upregulated in renal cell carcinoma tissues and cells and its expression was significantly associated with tumor stage (p=0.019) and survival (p=0.001) by analyzing tissue microarrays...
March 2, 2018: Oncotarget
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