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https://www.readbyqxmd.com/read/28222496/the-integrins-involved-in-soybean-agglutinin-induced-cell-cycle-alterations-in-ipec-j2
#1
Li Pan, Yuan Zhao, Zhijie Yuan, Mohammed Hamdy Farouk, Shiyao Zhang, Nan Bao, Guixin Qin
Soybean agglutinin (SBA) is an anti-nutritional factor of soybean, affecting cell proliferation and inducing cytotoxicity. Integrins are transmembrane receptors, mediating a variety of  cell biological processes. This research aims to study the effects of SBA on cell proliferation and cell cycle progression of the intestinal epithelial cell line from piglets (IPEC-J2), to identify the integrin subunits especially expressed in IPEC-J2s, and to analyze the functions of these integrins on IPEC-J2 cell cycle progression and SBA-induced IPEC-J2 cell cycle alteration...
February 21, 2017: Molecules and Cells
https://www.readbyqxmd.com/read/28222298/vascular-morphogenesis-an-integrin-and-fibronectin-highway
#2
Hellyeh Hamidi, Johanna Ivaska
A new study shows that endothelial cells use synaptic-like machinery to control polarized secretion and deposition of newly synthesised fibronectin. This process is coupled to active integrin recycling to the same locations and is fundamental for vascular development in zebrafish.
February 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28221249/the-%C3%AE-4%C3%AE-1-homing-pathway-is-essential-for-ileal-homing-of-crohn-s-disease-effector-t-cells-in-vivo
#3
Sebastian Zundler, Anika Fischer, Daniela Schillinger, Marie-Theres Binder, Raja Atreya, Timo Rath, Rocío Lopez-Pósadas, Caroline J Voskens, Alastair Watson, Imke Atreya, Clemens Neufert, Markus F Neurath
BACKGROUND: The precise mechanisms controlling homing of T effector (Teff) cells to the inflamed gut in Crohn's disease (CD) are still unclear, and clinical outcome data from patients with inflammatory bowel disease treated with the anti-α4β7 integrin antibody vedolizumab suggest differences between ulcerative colitis and CD. METHODS: Expression of homing molecules was studied with flow cytometry and immunohistochemistry. Their functional role was investigated in in vitro adhesion assays and in a humanized mouse model of T cell homing to the inflamed gut in vivo...
March 2017: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/28220178/a-photo-degradable-supramolecular-hydrogel-for-selective-delivery-of-microrna-into-3d-cultured-cells
#4
Zhengquan Zhou, Qikun Yi, Tingting Xia, Wencui Yin, Adnan A Kadi, Jinbo Li, Yan Zhang
Multi-functional supramolecular hydrogels have emerged as smart biomaterials for diverse biomedical applications. Here we report a multi-functional supramolecular hydrogel formed by the conjugate of the bioactive GRGDS peptide with biaryltetrazole that is the substrate of photo-click reaction. The hydrogel was used as a biocompatible matrix to encapsulate live cells for 3D culture. The presence of the RGD epitope in the hydrogelator enhanced the interaction of the nanofiber with integrin over-expressing cells, which resulted in the selective enhancement in the miRNA delivery into the encapsulated U87 cells...
February 21, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28220141/adhesive-peptide-sequences-regulate-valve-interstitial-cell-adhesion-phenotype-and-extracellular-matrix-deposition
#5
Yan Wu, K Jane Grande-Allen, Jennifer L West
Knowledge of how extracellular matrix (ECM) binding impacts valve interstitial cells (VICs) is critical not only to better understanding the etiology of valvular diseases but also to constructing living valve substitutes that can grow and remodel. Use of ECM-mimicking adhesive peptides with specific affinity to different receptors provides insights into adhesion-mediated cell signaling and downstream outcomes. Expression of adhesion receptors by VICs was assessed by flow cytometry and used to guide the choice of peptides studied...
December 2016: Cellular and Molecular Bioengineering
https://www.readbyqxmd.com/read/28220032/pharmacologic-blockade-of-%C3%AE-v%C3%AE-1-integrin-ameliorates-renal-failure-and-fibrosis-in-vivo
#6
Yongen Chang, Wei Ling Lau, Hyunil Jo, Kazuyuki Tsujino, Leslie Gewin, Nilgun Isik Reed, Amha Atakilit, Ane Claudia Fernandes Nunes, William F DeGrado, Dean Sheppard
Activated fibroblasts are deemed the main executors of organ fibrosis. However, regulation of the pathologic functions of these cells in vivo is poorly understood. PDGF receptor β (PDGFRβ) is highly expressed in activated pericytes, a main source of fibroblasts. Studies using a PDGFRβ promoter-driven Cre system to delete αv integrins in activated fibroblasts identified these integrins as core regulators of fibroblast activity across solid organs, including the kidneys. Here, we used the same PDGFRβ-Cre line to isolate and study renal fibroblasts ex vivo We found that renal fibroblasts express three αv integrins, namely αvβ1, αvβ3, and αvβ5...
February 20, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28219985/activity-induced-synaptic-structural-modifications-by-an-activator-of-integrin-signaling-at-the-drosophila-neuromuscular-junction
#7
Joo Yeun Lee, Junhua Geng, Juhyun Lee, Andrew R Wang, Karen T Chang
Activity-induced synaptic structural modification is crucial for neural development and synaptic plasticity, but the molecular players involved in this process are not well defined. Here, we report that a protein named Shriveled, Shv, regulates synaptic growth and activity-dependent synaptic remodeling at the Drosophila neuromuscular junction. Depletion of Shv causes synaptic overgrowth and an accumulation of immature boutons. We find that Shv physically and genetically interacts with βPS integrin. Furthermore, Shv is secreted during intense, but not mild, neuronal activity to acutely activate integrin signaling, induce synaptic bouton enlargement, and increase postsynaptic glutamate receptor abundance...
February 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28218908/cell-matrix-signals-specify-bone-endothelial-cells-during-developmental-osteogenesis
#8
Urs H Langen, Mara E Pitulescu, Jung Mo Kim, Rocio Enriquez-Gasca, Kishor K Sivaraj, Anjali P Kusumbe, Amit Singh, Jacopo Di Russo, M Gabriele Bixel, Bin Zhou, Lydia Sorokin, Juan M Vaquerizas, Ralf H Adams
Blood vessels in the mammalian skeletal system control bone formation and support haematopoiesis by generating local niche environments. While a specialized capillary subtype, termed type H, has been recently shown to couple angiogenesis and osteogenesis in adolescent, adult and ageing mice, little is known about the formation of specific endothelial cell populations during early developmental endochondral bone formation. Here, we report that embryonic and early postnatal long bone contains a specialized endothelial cell subtype, termed type E, which strongly supports osteoblast lineage cells and later gives rise to other endothelial cell subpopulations...
February 20, 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28218242/protein-disulfide-isomerase-secretion-following-vascular-injury-initiates-a-regulatory-pathway-for-thrombus-formation
#9
Sheryl R Bowley, Chao Fang, Glenn Merrill-Skoloff, Barbara C Furie, Bruce Furie
Protein disulfide isomerase (PDI), secreted by platelets and endothelial cells on vascular injury, is required for thrombus formation. Using PDI variants that form mixed disulfide complexes with their substrates, we identify by kinetic trapping multiple substrate proteins, including vitronectin. Plasma vitronectin does not bind to αvβ3 or αIIbβ3 integrins on endothelial cells and platelets. The released PDI reduces disulfide bonds on plasma vitronectin, enabling vitronectin to bind to αVβ3 and αIIbβ3...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28215822/structural-and-functional-analysis-of-two-small-leucine-rich-repeat-proteoglycans-fibromodulin-and-chondroadherin
#10
Patricia Paracuellos, Sebastian Kalamajski, Arkadiusz Bonna, Dominique Bihan, Richard W Farndale, Erhard Hohenester
The small leucine-rich proteoglycans (SLRPs) are important regulators of extracellular matrix assembly and cell signalling. We have determined crystal structures at ~2.2 Å resolution of human fibromodulin and chondroadherin, two collagen-binding SLRPs. Their overall fold is similar to that of the prototypical SLRP, decorin, but unlike decorin neither fibromodulin nor chondroadherin forms a stable dimer. A previously identified binding site for integrin α2β1 maps to an α-helix in the C-terminal cap region of chondroadherin...
February 16, 2017: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/28215671/dual-ligand-%C3%AE-5%C3%AE-1-and-%C3%AE-6%C3%AE-4-integrin-targeting-enhances-gene-delivery-and-selectivity-to-cancer-cells
#11
Rachel M Levine, Efrosini Kokkoli
Nanoparticles functionalized with cancer-targeting ligands have shown promise but are still limited by off-tumor binding to healthy tissues that express low levels of the molecular target. Targeting two cancer biomarkers using dual-targeted heteromultivalent nanoparticles presents a possible solution to this challenge by requiring overexpression of two separate ligands for localization. In order to guide experimental design, a kinetic model was built to explore how the affinity and valency of dual-ligand liposomes affect the binding and selectivity of delivery to cells with various receptor expression...
February 16, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28215575/fibronectin-connecting-segment-1-peptide-inhibits-pathogenic-leukocyte-trafficking-and-inflammatory-demyelination-in-experimental-models-of-chronic-inflammatory-demyelinating-polyradiculoneuropathy
#12
Chaoling Dong, Kelsey M Greathouse, Rebecca L Beacham, Steven P Palladino, E Scott Helton, Eroboghene E Ubogu
The molecular determinants of pathogenic leukocyte migration across the blood-nerve barrier (BNB) in chronic inflammatory demyelinating polyradiculoneuropathy (CIDP) are unknown. Specific disease modifying therapies for CIDP are also lacking. Fibronectin connecting segment-1 (FNCS1), an alternatively spliced fibronectin variant expressed by microvascular endothelial cells at sites of inflammation in vitro and in situ, is a counterligand for leukocyte α4 integrin (also known as CD49d) implicated in pathogenic leukocyte trafficking in multiple sclerosis and inflammatory bowel disease...
February 16, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28214869/effects-of-antimalarial-tafenoquine-on-blood-platelet-activity-and-survival
#13
Hang Cao, Rosi Bissinger, Anja T Umbach, Abdulla Al Mamun Bhuyan, Florian Lang, Meinrad Gawaz
BACKGROUND/AIMS: The 8-aminoquinoline tafenoquine has been shown to be effective against Plasmodia, Leishmania and Trypanosoma. The substance is at least in part effective by triggering apoptosis of the parasites. Moreover, tafenoquine has been shown to trigger eryptosis, the suicidal erythrocyte death characterized by cell shrinkage and cell membrane scrambling with phosphatidylserine translocation to the erythrocyte surface. The effect of tafenoquine on eryptosis is in part due to stimulation of Ca2+ entry and oxidative stress...
January 26, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214855/fatty-acid-binding-protein-4-in-endometrial-epithelium-is-involved-in-embryonic-implantation
#14
Peng Wang, Qiuyuan Zhu, Huilian Peng, Mengkai Du, Minyue Dong, Hanzhi Wang
AIMS: To clarify the role of fatty acid-binding protein 4 (FABP4) of endometrial epithelial cell in the establishment and maintenance of pregnancy and the involvement in the pathogenesis of pregnancy loss. METHODS: The expression of FABP4 and uterine receptive factor (LIF, Integrin-β3 and Claudin 4) was determined by Western blotting or quantitative PCR. FABP4 siRNA was used to silence FABP4 while FABP4 inhibitor was used to inhibit the function of FABP4 in endometrial epithelial cell...
January 30, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214836/hepatitis-b-virus-x-protein-reduces-podocyte-adhesion-via-downregulation-of-%C3%AE-3%C3%AE-1-integrin
#15
Ping He, Dajun Liu, Beiru Zhang, Guangyu Zhou, Xuesong Su, Yanqiu Wang, Detian Li, Xu Yang
BACKGROUND/AIMS: Hepatitis B virus (HBV)-associated glomerulonephritis (HBV-GN) is characterized by a reduced number of podocytes due to apoptosis and shedding from the basement membrane. However, the pathological mechanism of HBV-GN is unclear. We previously showed that hepatitis B virus X protein (HBx) promotes apoptosis in tubular epithelial cells. In this study, we transfected podocytes with HBx and examined the effects on adhesion and apoptosis of these cells. METHODS: Podocytes were transfected with pc-DNA3...
February 8, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214467/paxillin-a-crossroad-in-pathological-cell-migration
#16
REVIEW
Ana María López-Colomé, Irene Lee-Rivera, Regina Benavides-Hidalgo, Edith López
Paxilllin is a multifunctional and multidomain focal adhesion adapter protein which serves an important scaffolding role at focal adhesions by recruiting structural and signaling molecules involved in cell movement and migration, when phosphorylated on specific Tyr and Ser residues. Upon integrin engagement with extracellular matrix, paxillin is phosphorylated at Tyr31, Tyr118, Ser188, and Ser190, activating numerous signaling cascades which promote cell migration, indicating that the regulation of adhesion dynamics is under the control of a complex display of signaling mechanisms...
February 18, 2017: Journal of Hematology & Oncology
https://www.readbyqxmd.com/read/28214208/reduced-immunohistochemical-expression-of-adhesion-molecules-in-vitiligo-skin-biopsies
#17
Adriane Reichert Faria, Juliana Elizabeth Jung, Caio César Silva de Castro, Lucia de Noronha
Because defects in adhesion impairment seem to be involved in the etiopathogenesis of vitiligo, this study aimed to compare the immunohistochemical expression of several adhesion molecules in the epidermis of vitiligo and non lesional vitiligo skin. Sixty-six specimens of lesional and non lesional skin from 33 volunteers with vitiligo were evaluated by immunohistochemistry using anti-beta-catenin, anti-E-cadherin, anti-laminin, anti-beta1 integrin, anti-collagen IV, anti-ICAM-1 and anti-VCAM-1 antibodies. Biopsies of vitiligo skin demonstrated a significant reduction in the expression of laminin and integrin...
December 30, 2016: Pathology, Research and Practice
https://www.readbyqxmd.com/read/28213554/hypoxia-selectively-enhances-integrin-receptor-expression-to-promote-metastasis
#18
Julia A Ju, Ines Godet, I Chae Ye, Jungmin Byun, Hasini Jayatilaka, Sun Joo Lee, Lisha Xiang, Debangshu Samanta, Meng Horng Lee, Pei-Hsun Wu, Denis Wirtz, Gregg L Semenza, Daniele M Gilkes
: Metastasis is the leading cause of breast cancer (BCa)mortality. Previous studies have implicated hypoxia-induced changes in the composition and stiffness of the extracellular matrix (ECM) in the metastatic process. Therefore, the contribution of potential ECM binding receptors in this process was explored. Using a bioinformatics approach the expression of all integrin receptor subunits, in two independent BCa patient data sets, were analyzed to determine if integrin status correlates with a validated hypoxiainducible gene signature...
February 17, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28213494/plc%C3%AE%C2%B51-regulates-sdf-1%C3%AE-induced-lymphocyte-adhesion-and-migration-to-sites-of-inflammation
#19
Marianne Strazza, Inbar Azoulay-Alfaguter, Michael Peled, Alan V Smrcka, Edward Y Skolnik, Shekhar Srivastava, Adam Mor
Regulation of integrins is critical for lymphocyte adhesion to endothelium and migration throughout the body. Inside-out signaling to integrins is mediated by the small GTPase Ras-proximate-1 (Rap1). Using an RNA-mediated interference screen, we identified phospholipase Cε 1 (PLCε1) as a crucial regulator of stromal cell-derived factor 1 alpha (SDF-1α)-induced Rap1 activation. We have shown that SDF-1α-induced activation of Rap1 is transient in comparison with the sustained level following cross-linking of the antigen receptor...
February 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28213315/focal-adhesion-kinase-signaling-in-unexpected-places
#20
REVIEW
Elizabeth G Kleinschmidt, David D Schlaepfer
Focal adhesion kinase (FAK) is a cytoplasmic protein-tyrosine kinase first identified at extracellular matrix and integrin receptor cell adhesion sites and is a key regulator of cell movement. FAK is activated by a variety of stimuli. Herein, we discuss advances in conformational-associated FAK activation and dimerization mechanisms. Additionally, new roles have emerged for FAK signaling at cell adhesions, adherens junctions, endosomes, and the nucleus. In light of these new findings, we review how FAK activation at these sites is connected to the regulation of integrin recycling-activation, vascular permeability, cell survival, and transcriptional regulation, respectively...
February 14, 2017: Current Opinion in Cell Biology
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