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https://www.readbyqxmd.com/read/29240434/fibrinogen-motif-discriminates-platelet-and-cell-capture-at-peptide-modified-gold-micropore-arrays
#1
Kellie Adamson, Elaine Spain, Una Prendergast, Niamh Moran, Robert J Forster, Tia E Keyes
Human blood platelets and SK-N-AS neuroblastoma cancer cell capture at spontaneously adsorbed monolayers of fibrinogen binding motifs GRGDS (generic integrin adhesion), HHLGGAKQAGDV (exclusive to platelet integrin αIIbβ3) or octanethiol (adhesion inhibitor) at planar gold and ordered 1.6 micron diameter spherical cap gold cavity arrays was compared. In all cases, RGD promoted capture while alkanethiol monolayers inhibited adhesion. Conversely only platelets adhered to AGD modified surfaces, indicating the AGD motif is recognized preferentially by the platelet specific integrin, αIIbβ3...
December 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29240422/high-in-vivo-stability-of-64cu-labeled-cross-bridged-chelators-is-a-crucial-factor-in-improved-tumor-imaging-of-rgd-peptide-conjugates
#2
Swarbhanu Sarkar, Nikunj Bhatt, Yeong Su Ha, Phuong Tu Huynh, Nisarg Soni, Woong Hee Lee, Yong Jin Lee, Jung Young Kim, Darpan N Pandya, Gwang Il An, Kyo Chul Lee, Yongmin Chang, Jeongsoo Yoo
Although the importance of bifunctional chelators (BFCs) is well recognized, the chemophysical parameters of chelators that govern the biological behavior of the corresponding bioconjugates have not been clearly elucidated. Here, five BFCs closely related in structure were conjugated with a cyclic RGD peptide and radiolabeled with Cu-64 ions. Various biophysical and chemical properties of the Cu(II) complexes were analyzed with the aim of identifying correlations between individual factors and the biological behavior of the conjugates...
December 14, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29223705/functional-hepatocyte-clusters-on-bioactive-blend-silk-matrices-towards-generating-bioartificial-liver-constructs
#3
Guru Janani, Samit K Nandi, Biman B Mandal
The creation of in vitro functional hepatic tissue simulating micro-environmental niche of native liver is a keen area of research due to its demand in bioartificial liver (BAL) and cell-based tissue engineering. Here, we investigated the potential of novel blend (BA) silk scaffold fabricated by blending mulberry (Bombyx mori, BM) silk fibroin with cell adhesion motif (RGD) rich non-mulberry (Antheraea assamensis, AA) silk fibroin in generating a functional liver construct. Three-dimensional (3D) porous silk scaffolds (BM, AA and BA) were physico-chemically characterized and functionally evaluated using human hepatocarcinoma cells (HepG2) and primary neonatal rat hepatocytes...
December 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29222169/nanoscale-tuning-of-vcam-1-determines-vla-4-dependent-melanoma-cell-plasticity-on-rgd-motifs
#4
Katharina Amschler, Eugen Kossmann, Luise Erpenbeck, Sebastian Kruss, Tillmann Schill, Margarete Schön, Sigrid M C Möckel, Joachim P Spatz, Michael P Schön
The biophysical fine-tuning of cancer cell plasticity is crucial for tumor progression but remains largely enigmatic. Although Vascular Cell Adhesion Molecule-1 (VCAM-1/CD106) has been implicated in melanoma progression, here its presentation on endothelial cells was associated with diminished melanoma cell spreading. Using a specific nanoscale-modulation of VCAM-1 (tunable from 70 to 670 ligands/µm²) next to integrin ligands (RGD motifs) in a bifunctional system, reciprocal regulation of integrin α4 (ITGA4/VLA-4/CD49d)-dependent adhesion and spreading of melanoma cells was found...
December 8, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/29222114/blood-vitronectin-is-a-major-activator-of-lif-and-il-6-in-the-brain-through-integrin-fak-and-upar-signaling
#5
M P Keasey, C Jia, L F Pimentel, R S Sante, C Lovins, T Hagg
We defined how blood-derived vitronectin (VTN) rapidly and potently activates leukemia inhibitory factor (LIF) and pro-inflammatory interleukin 6 (IL-6) in vitro and after vascular injury in the brain. VTN (not fibrinogen, fibronectin, laminin-111, collagen-I) robustly increased LIF and IL-6 within 4 hr in C6-astroglioma cells, while VTN-/- mouse plasma was less effective than wildtype. LIF and IL-6 were induced by intracerebral injection of rhVTN in mice, but less by intracerebral hemorrhage in VTN-/- than wildtype littermates...
December 8, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/29216011/understanding-the-molecular-mechanism-of-improved-proliferation-and-osteogenic-potential-of-human-mesenchymal-stem-cells-grown-on-a-polyelectrolyte-complex-derived-from-non-mulberry-silk-fibroin-and-chitosan
#6
Akalabya Bissoyi, Abhishek Kumar Singh, Subrat Kumar Pattanayak, Arindam Bit, Sudip Kumar Sinha, Ashish Patel, Vishal Jain, Pradeep Kumar Patra
The development of engineered bone tissue, as a promising alternative to conventional bone grafts, has so far not proven successful and still remains challenging. Thus, attempts have been made in the present study to synthesize polyelectrolyte complex (PEC) scaffolds by blending chitosan (CS) to silk fibroin (SF) derived from the non-mulberry silkworm (Antheraea pernyi) at three different pH values (5.0, 6.0, and 7.0), and to characterize them in terms of morphology, ultrastructure and mechanical properties with scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy, x-ray diffraction and tensile strength analyses...
December 7, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29210373/enhanced-cell-adhesion-on-a-bio-inspired-hierarchically-structured-polyester-modified-with-gelatin-methacrylate
#7
Ping Li, Xiaoqiu Dou, Chuanliang Feng, Holger Schönherr
Herein, fabrication and modification of novel bio-inspired microwell arrays with nanoscale topographic structures are reported. The natural nano- and microstructures present on the surface of rose petals were hypothesized to enhance cell-surface contacts. Thus hierarchically structured polyethylene terephthalate glycol modified (PETG) substrates were fabricated by replication from rose petals via nanoimprint lithography, followed by covalent modification and crosslinking with RGD-presenting gelatin-methacrylate (GelMA) for promoting cell adhesion and spreading...
December 6, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29196192/macrovipecetin-a-c-type-lectin-from-macrovipera-lebetina-venom-inhibits-proliferation-migration-and-invasion-of-sk-mel-28-human-melanoma-cells-and-enhances-their-sensitivity-to-cisplatin
#8
Manel B Hammouda, Ichrak Riahi-Chebbi, Soumaya Souid, Houcemeddine Othman, Zohra Aloui, Najet Srairi-Abid, Habib Karoui, Ammar Gasmi, Edith M Magnenat, Timothy N C Wells, Kenneth J Clemetson, José Neptuno Rodríguez-López, Khadija Essafi-Benkhadir
BACKGROUND: The resistance of melanoma cells to cisplatin restricts its clinical use. Therefore, the search for novel tumor inhibitors and effective combination treatments that sensitize tumor cells to this drug are still needed. We purified macrovipecetin, a novel heterodimeric C-type lectin, from Macrovipera lebetina snake venom and investigated its anti-tumoral effect on its own or combined with cisplatin, in human melanoma cells. METHODS: Biochemical characterization, in vitro cells assays such as viability, apoptosis, adhesion, migration, invasion, Western blotting and in silico analysis were used in this study...
November 28, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29183134/-b-i-in-vitro-i-transduction-and-target-mutagenesis-efficiency-of-hiv-1-i-pol-i-gene-targeting-zfn-and-crisper-cas9-delivered-by-various-plasmids-and-or-vectors-towards-an-hiv-cure-b
#9
Moses Okee, Alice Bayiyana, Carol Musubika, Moses Joloba, Fred Ashaba-Katabazi, Bernard Ssentalo Bagaya, Misaki Wayengera
Efficiency of artificial restriction enzymes (AREs) towards curing HIV has only been separately examined, using differing delivery vehicles. We compared the in-vitro transduction and target-mutagenesis efficiency of consortium-plasmid and adenoviral vector delivered HIV-1<i> pol </i>gene targeting ZFN with CRISPER/Cas. Custom-ZFN, CRISPER-Cas-9, plasmids and vectors (murCTSD_pZFN, pGS-U-gRNA, pCMV-Cas-D01A, Ad5-RGD); cell-lines (TZM-bl and ACH-2/J-Lat cells); and the latency reversing agents Prostatin, SAHA, and PMA were used...
November 28, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/29182679/the-extracellular-matrix-protein-edil3-stimulates-osteoblast-differentiation-through-the-integrin-%C3%AE-5%C3%AE-1-erk-runx2-pathway
#10
Sin-Hye Oh, Jung-Woo Kim, Yuri Kim, Mi Nam Lee, Min-Suk Kook, Eun Young Choi, Suhn-Young Im, Jeong-Tae Koh
Epidermal growth factor-like repeats and discoidin I-like domain 3 (Edil3) is an extracellular matrix protein containing an Arg-Gly-Asp (RGD) motif that binds integrin. Recently, Edil3 has been implicated in various biological processes, including angiogenesis and cellular differentiation. It can inhibit inflammatory bone destruction. The objective of this study was to explore the role of Edil3 in osteoblast differentiation and its underlying molecular mechanisms. In wild-type mice, high expression levels of Edil3 mRNA were observed in isolated calvaria and tibia/femur bones...
2017: PloS One
https://www.readbyqxmd.com/read/29180787/towards-the-cell-instructive-bactericidal-substrate-exploring-the-combination-of-nanotopographical-features-and-integrin-selective-synthetic-ligands
#11
Roberta Fraioli, Penelope M Tsimbouri, Leanne E Fisher, Angela H Nobbs, Bo Su, Stefanie Neubauer, Florian Rechenmacher, Horst Kessler, Maria-Pau Ginebra, Matthew J Dalby, José M Manero, Carlos Mas-Moruno
Engineering the interface between biomaterials and tissues is important to increase implant lifetime and avoid failures and revision surgeries. Permanent devices should enhance attachment and differentiation of stem cells, responsible for injured tissue repair, and simultaneously discourage bacterial colonization; this represents a major challenge. To take first steps towards such a multifunctional surface we propose merging topographical and biochemical cues on the surface of a clinically relevant material such as titanium...
November 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29173223/epidemiology-and-genetic-diversity-of-human-parechoviruses-circulating-among-children-hospitalised-with-acute-gastroenteritis-in-pune-western-india-a-5-years-study
#12
P R Patil, N N Ganorkar, V Gopalkrishna
Human parechoviruses (HPeVs) are known to cause various clinical manifestations including acute gastroenteritis. Although HPeV infections and their genotypes have been detected in human patients worldwide, no such reports are available from India to ascertain the association of HPeVs in acute gastroenteritis. The present study was conducted to determine the clinical features and genetic diversity of HPeVs detected in children hospitalised for acute gastroenteritis. Stool specimens (n = 979) collected from children aged ⩽5 years hospitalised for acute gastroenteritis in Pune, western India during January 2006-December 2010 were included...
November 27, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/29169039/heteromultivalent-targeting-of-integrin-%C3%AE-v%C3%AE-3-and-neuropilin-1-promotes-cell-survival-via-the-activation-of-the-igf-1-insulin-receptors
#13
Tao Jia, Jungyoon Choi, Jéremy Ciccione, Maxime Henry, Ahmad Mehdi, Jean Martinez, Béatrice Eymin, Gilles Subra, Jean-Luc Coll
Angiogenesis strongly depends on the activation of integrins, especially integrin αvβ3, and of neuropilin-1 (NRP-1), a co-receptor of VEGFR2. Dual-targeted molecules that simultaneously block both of them are expected have increased anti-angiogenic and antitumor activity. Toward this goal, we generated bifunctional 40 nm-sized silica nanoparticles (NPs) coated with controlled amounts of cRGD and ATWLPPR peptides and studied their affinity, selectivity and biological activity in HUVECs. Sub-nanomolar concentrations of NPs grafted either with ATWLPPR alone or in combination with cRGD exhibit potent and specific antagonist activity against VEGFR2/AKT signaling...
October 29, 2017: Biomaterials
https://www.readbyqxmd.com/read/29166813/the-efficacy-of-rgd-modified-liposomes-loaded-with-vinorelbine-plus-tetrandrine-in-treating-resistant-brain-glioma
#14
Xue-Tao Li, Wei Tang, Hong-Jun Xie, Shuang Liu, Xiao-Li Song, Yao Xiao, Xin Wang, Lan Cheng, Gui-Rong Chen
Brain glioma is one of the most common and devastating intracranial malignancies with a high mortality. Chemotherapy for brain glioma is not ideal due to blood brain barrier (BBB) and multidrug resistance (MDR). The objectives of the present study were to develop a kind of RGD (Arg-Gly-Asp) tripeptide modified vinorelbine plus tetrandrine liposomes to achieve BBB transportation, MDR reversion and glioma cell targeting simultaneously. The studies were performed on glioma cells, resistant glioma cells and glioma-bearing mice...
November 22, 2017: Journal of Liposome Research
https://www.readbyqxmd.com/read/29165981/layered-double-hydroxide-and-polypeptide-thermogel-nanocomposite-system-for-chondrogenic-differentiation-of-stem-cells
#15
Seon Sook Lee, Goeun Choi, Hyun Jung Lee, Yelin Kim, Jin-Ho Choy, Byeongmoon Jeong
Stem cell therapy for damaged cartilages suffers from the low rates of retention, survival, and differentiation into chondrocytes at the target site. To solve these problems, here we propose a two dimensional/three dimensional (2D/3D) nanocomposite system. As a new two dimensional (2D) material, hexagonal layered double hydroxides (LDHs) with a uniform lateral length of 2-3 μm were prepared by a hydrothermal process. And then, tonsil-derived mesenchymal stem cells (TMSCs), RGD-coated LDHs, and kartogenin (KGN) were incorporated into the gel through the thermal energy-driven gelation of the system...
November 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29157863/structure-activity-relationship-study-of-aib-containing-amphipathic-helical-peptide-cyclic-rgd-conjugates-as-carriers-for-sirna-delivery
#16
Shun-Ichi Wada, Anna Takesada, Yurie Nagamura, Eri Sogabe, Rieko Ohki, Junsuke Hayashi, Hidehito Urata
The conjugation of Aib-containing amphipathic helical peptide with cyclo(-Arg-Gly-Asp-d-Phe-Cys-) (cRGDfC) at the C-terminus of the helix peptide (PI) has been reported to be useful for constructing a carrier for targeted siRNA delivery into cells. In order to explore structure-activity relationships for the development of potential carriers for siRNA delivery, we synthesized conjugates of Aib-containing amphipathic helical peptide with cRGDfC at the N-terminus (PII) and both the N- and C-termini (PIII) of the helical peptide...
November 10, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29155306/reverse-t3-interacts-with-%C3%AE-v%C3%AE-3-integrin-receptor-and-restores-enzyme-activities-in-the-hippocampus-of-hypothyroid-developing-rats-insight-on-signaling-mechanisms
#17
Juliana Tonietto Domingues, Daiane Cattani, Patricia Acordi Cesconetto, Bianka Alzira Nascimento de Almeida, Paula Peirozan, Guilherme Razzera, Fátima Regina Mena Barreto Silva, Regina Pessoa-Pureur, Ariane Zamoner
In the present study we provide evidence that 3,3',5'-triiodothyronine (reverse T3, rT3) restores neurochemical parameters induced by congenital hypothyroidism in rat hippocampus. Congenital hypothyroidism was induced by adding 0.05% propylthiouracil in the drinking water from gestation day 8 and continually up to lactation day 15. In the in vivo rT3 exposure, hypothyroid 12-day old pups were daily injected with rT3 (50 ng/kg body weight) or saline until day 14. In the ex vivo rT3 treatment, hippocampal slices from 15-day-old hypothyroid pups were incubated for 30 min with or without rT3 (1 nM)...
November 16, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29155160/%C3%AE-v%C3%AE-3-and-%C3%AE-5%C3%AE-1-integrin-specific-ligands-from-tumor-angiogenesis-inhibitors-to-vascularization-promoters-in-regenerative-medicine
#18
REVIEW
Luís A Rocha, David A Learmonth, Rui A Sousa, António J Salgado
Integrins are cell adhesion receptors predominantly important during normal and tumor angiogenesis. A sequence present on several extracellular matrix proteins composed of Arg-Gly-Asp (RGD) has attracted attention due to its role in cell adhesion mediated by integrins. The development of ligands that can bind to integrins involved in tumor angiogenesis and brake disease progression has resulted in new investigational drug entities reaching the clinical trial phase in humans. The use of integrin-specific ligands can be useful for the vascularization of regenerative medicine constructs, which remains a major limitation for translation into clinical practice...
November 15, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/29152665/effects-of-wd%C3%A2-3-on-tumor-growth-and-the-expression-of-integrin-%C3%AE-v%C3%AE-3-and-erk1-2-in-mice-bearing-human-gastric-cancer-using-the-18f%C3%A2-rgd-pet-ct-imaging-system
#19
Chunhui Jin, Bao-Nan Zhang, Zhipeng Wei, Bo Ma, Qi Pan, Pingping Hu
Activation of the vitronectin receptor αvβ3 and the phosphorylation of extracellular signal‑regulated kinase (ERK)1/2 are critical events during tumor development and progression. The aim of the present study was to investigate the effects of WD‑3, a formula used in traditional Chinese medicine, on integrin αvβ3 and ERK1/2 expression in vivo using a nude mouse‑human gastric cancer xenograft model combined with non‑invasive, real‑time 18F‑Arg‑Gly‑Asp (RGD) positron emission tomography (PET)/computerized tomography (CT) imaging methods...
October 19, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29148709/nir-emitting-nanoprobes-based-on-cyclic-rgd-motif-conjugated-pbs-quantum-dots-for-integrin-targeted-optical-bioimaging
#20
Nicoletta Depalo, Michela Corricelli, Ivan de Paola, Gianpiero Valente, Rosa M Iacobazzi, Emiliano Altamura, Doriana Debellis, Daniela Comegna, Elisabetta Fanizza, Nunzio Denora, Valentino Laquintana, Fabio Mavelli, Marinella Striccoli, Michele Saviano, Angela Agostiano, Annarita Del Gatto, Laura Zaccaro, Maria Lucia Curri
Here, silica coated PbS quantum dots (QDs) with photoluminesce emission properties in the near-infrared (NIR) region are proposed as potential effective single particle optical nanoprobes for future in vivo imaging of tumors. The dispersibility in aqueous medium of hydrophobic PbS QDs was accomplished by growing a silica shell on their surface by exploiting a base assisted water-in-oil microemulsion method. The silica coated PbS QDs were then conjugated with specifically designed cyclic arginine-glycine-aspartic acid (cRGD) peptide, that are able to specifically recognizes the αvβ3 integrins which is overexpressed in the angiogenic tumor induced vasculatures and on some solid tumours, in order to achieve a tumor-specific targeting...
November 17, 2017: ACS Applied Materials & Interfaces
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