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https://www.readbyqxmd.com/read/27886058/optical-aptamer-probes-of-fluorescent-imaging-to-rapid-monitoring-of-circulating-tumor-cell
#1
Ji Yeon Hwang, Sang Tae Kim, Ho-Seong Han, Kyunggon Kim, Jin Soo Han
Fluorescence detecting of exogenous EpCAM (epithelial cell adhesion molecule) or muc1 (mucin1) expression correlated to cancer metastasis using nanoparticles provides pivotal information on CTC (circulating tumor cell) occurrence in a noninvasive tool. In this study, we study a new skill to detect extracellular EpCAM/muc1 using quantum dot-based aptamer beacon (QD-EpCAM/muc1 ALB (aptamer linker beacon). The QD-EpCAM/muc1 ALB was designed using QDs (quantum dots) and probe. The EpCAM/muc1-targeting aptamer contains a Ep-CAM/muc1 binding sequence and BHQ1 (black hole quencher 1) or BHQ2 (black hole quencher2)...
November 23, 2016: Sensors
https://www.readbyqxmd.com/read/27874037/visualizing-epithelial-expression-of-egfr-in-vivo-with-distal-scanning-side-viewing-confocal-endomicroscope
#2
Xiyu Duan, Haijun Li, Juan Zhou, Quan Zhou, Kenn R Oldham, Thomas D Wang
Confocal endomicroscopy is an emerging imaging technology that has recently been introduced into the clinic to instantaneously collect "optical biopsies" in vivo with histology-like quality. Here, we demonstrate a fast scanner located in the distal end of a side-viewing instrument using a compact lens assembly with numerical aperture of 0.5 to achieve a working distance of 100 μm and field-of-view of 300 × 400 μm(2). The microelectromechanical systems (MEMS) mirror was designed based on the principle of parametric resonance and images at 5 frames per second...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27862961/identification-of-a-glypican-3-binding-peptide-for-in-vivo-non-invasive-human-hepatocellular-carcinoma-detection
#3
Zainen Qin, Jingjing Wang, Ye Wang, Guohao Wang, Xiangyu Wang, Zhiyang Zhou, Gang Liu, Shi Gao, Lei Zhu
Early and accurate detection of hepatocellular carcinoma (HCC) is essential to improve the prognosis of patients and reduce the morbidity of surgical therapy. Glypican-3 (GPC3) is a protein abnormally expressed in HCC that has been identified as a serological and histochemical HCC marker. A novel peptide that specifically recognizes GPC3 will facilitate early detection of HCC and guide the treatment strategy. Herein, phage display screening technology is utilized to obtain a GPC3 binding peptide (GBP) using HCC cells expressing GPC3 in varying abundances...
November 15, 2016: Macromolecular Bioscience
https://www.readbyqxmd.com/read/27816727/flow-cytometric-analysis-of-t-lymphocyte-proliferation-in-vivo-by-edu-incorporation
#4
Xiaojing Sun, Chunpan Zhang, Hua Jin, Guangyong Sun, Yue Tian, Wen Shi, Dong Zhang
Monitoring T lymphocyte proliferation, especially in vivo, is essential for the evaluation of adaptive immune reactions. Flow cytometry-based proliferation assays have advantages in measuring cell division of different T lymphocyte subsets at the same time by multicolor labelling. In this study, we aimed to establish the use of 5-Ethynyl-2'-deoxyuridine (EdU) incorporation in vivo to monitor T lymphocyte proliferation by flow cytometry with an adoptive transfer model. We found that fixation followed by permeabilization preserved T cell surface antigens and had no obvious effects on the fluorescence intensity of APC, PE, PE-Cy7, FITC and PerCP-Cy5...
November 2, 2016: International Immunopharmacology
https://www.readbyqxmd.com/read/27788352/mri-optical-dual-modality-imaging-of-vulnerable-atherosclerotic-plaque-with-an-osteopontin-targeted-probe-based-on-fe3o4-nanoparticles
#5
Hongyu Qiao, Yabin Wang, Ruohan Zhang, Quansheng Gao, Xiao Liang, Lei Gao, Zhenhua Jiang, Ruirui Qiao, Dong Han, Yan Zhang, Ya Qiu, Jie Tian, Mingyuan Gao, Feng Cao
Rupture of vulnerable atherosclerotic plaque is the major pathological cause of luminal thrombosis in acute coronary syndromes. Since foamy macrophages have been identified as a prominent component in vulnerable atherosclerotic lesions and osteopontin (OPN) is reported to be highly expressed in foamy macrophages, OPN could be a potential target for vulnerable atherosclerotic plaque imaging. The current study designed an OPN-specific MRI/optical dual-modality probe to detect vulnerable plaques. Fluorescence imaging revealed that 24 h after injection of the Cy5...
October 11, 2016: Biomaterials
https://www.readbyqxmd.com/read/27776554/s100a8-a9-a-potent-serum-and-molecular-imaging-biomarker-for-synovial-inflammation-and-joint-destruction-in-seronegative-experimental-arthritis
#6
Edwin J W Geven, Martijn H J van den Bosch, Irene Di Ceglie, Giuliana Ascone, Shahla Abdollahi-Roodsaz, Annet W Sloetjes, Sven Hermann, Michael Schäfers, Fons A J van de Loo, Peter M van der Kraan, Marije I Koenders, Dirk Foell, Johannes Roth, Thomas Vogl, Peter L E M van Lent
BACKGROUND: Seronegative joint diseases are characterized by a lack of well-defined biomarkers since autoantibodies are not elevated. Calprotectin (S100A8/A9) is a damage-associated molecular pattern (DAMP) which is released by activated phagocytes, and high levels are found in seronegative arthritides. In this study, we investigated the biomarker potential of systemic and local levels of these S100 proteins to assess joint inflammation and joint destruction in an experimental model for seronegative arthritis...
October 24, 2016: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/27768026/combined-near-infrared-fluorescent-imaging-and-micro-computed-tomography-for-directly-visualizing-cerebral-thromboemboli
#7
Dong-Eog Kim, Jeong-Yeon Kim, Su-Kyoung Lee, Ju Hee Ryu, Ick Chan Kwon, Cheol-Hee Ahn, Kwangmeyung Kim, Dawid Schellingerhout
Direct thrombus imaging visualizes the root cause of thromboembolic infarction. Being able to image thrombus directly allows far better investigation of stroke than relying on indirect measurements, and will be a potent and robust vascular research tool. We use an optical imaging approach that labels thrombi with a molecular imaging thrombus marker - a Cy5.5 near-infrared fluorescent (NIRF) probe that is covalently linked to the fibrin strands of the thrombus by the fibrin-crosslinking enzymatic action of activated coagulation factor XIIIa during the process of clot maturation...
September 25, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27766208/in-vivo-photoacoustic-tomography-of-egfr-overexpressed-in-hepatocellular-carcinoma-mouse-xenograft
#8
Quan Zhou, Zhao Li, Juan Zhou, Bishnu P Joshi, Gaoming Li, Xiyu Duan, Rork Kuick, Scott R Owens, Thomas D Wang
EGFR is a promising cell surface target for in vivo imaging that is highly overexpressed in hepatocellular carcinoma (HCC), a common cancer worldwide. Peptides penetrate easily into tumors for deep imaging, and clear rapidly from the circulation to minimize background. We aim to demonstrate use of an EGFR specific peptide to detect HCC xenograft tumors in mice with photoacoustic imaging. Nude mice implanted with human HCC cells that overexpress EGFR were injected intravenously with Cy5.5-labeled EGFR and scrambled control peptides respectively...
June 2016: Photoacoustics
https://www.readbyqxmd.com/read/27748178/a-high-throughput-assay-for-developing-inhibitors-of-phop-a-virulence-factor-of-mycobacterium-tuberculosis
#9
Liqin Wang, Miao Xu, Noel Southall, Wei Zheng, Shuishu Wang
Tuberculosis (TB) still kills over 1.5 million people per year despite available anti-TB drugs. The emergence of drug-resistant TB poses a major threat to public health and prompts for an urgent need for new and more effective drugs. The long duration needed to treat TB by the current TB drugs, which target the essential cellular activities, inevitably leads to the emergence of drug-resistance. PhoP of Mycobacterium tuberculosis (MTB), an essential virulence factor, is a novel target for drug development. Guided by the crystal structure of the PhoP-DNA complex, we designed and developed a robust high-throughput screening assay for identification of PhoP inhibitors that disrupt the PhoP-DNA binding...
October 10, 2016: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/27708218/overexpression-of-caveolin-1-attenuates-brain-edema-by-inhibiting-tight-junction-degradation
#10
Kang-Ho Choi, Hyung-Seok Kim, Man-Seok Park, Eun-Bin Lee, Jung-Kil Lee, Joon-Tae Kim, Ja-Hae Kim, Min-Cheol Lee, Hong-Joon Lee, Ki-Hyun Cho
Cerebral edema from the disruption of the blood-brain barrier (BBB) after cerebral ischemia is a major cause of morbidity and mortality as well as a common event in patients with stroke. Caveolins (Cavs) are thought to regulate BBB functions. Here, we report for the first time that Cav-1 overexpression (OE) decreased brain edema from BBB disruption following ischemic insult. Edema volumes and Cav-1 expression levels were measured following photothrombosis and middle cerebral artery occlusion (MCAO). Endothelial cells that were transduced with a Cav-1 lentiviral expression vector were transplanted into rats...
September 29, 2016: Oncotarget
https://www.readbyqxmd.com/read/27703352/multimodal-near-infrared-emitting-plus-silica-nanoparticles-with-fluorescent-photoacoustic-and-photothermal-capabilities
#11
Stefania Biffi, Luca Petrizza, Chiara Garrovo, Enrico Rampazzo, Laura Andolfi, Pierangela Giustetto, Ivaylo Nikolov, Gabor Kurdi, Miltcho Boyanov Danailov, Giorgio Zauli, Paola Secchiero, Luca Prodi
PURPOSE: The aim of the present study was to develop nanoprobes with theranostic features, including - at the same time - photoacoustic, near-infrared (NIR) optical imaging, and photothermal properties, in a versatile and stable core-shell silica-polyethylene glycol (PEG) nanoparticle architecture. MATERIALS AND METHODS: We synthesized core-shell silica-PEG nanoparticles by a one-pot direct micelles approach. Fluorescence emission and photoacoustic and photothermal properties were obtained at the same time by appropriate doping with triethoxysilane-derivatized cyanine 5...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27702685/conjugates-of-ha2-with-octaarginine-grafted-hpma-copolymer-offer-effective-sirna-delivery-and-gene-silencing-in-cancer-cells
#12
Moran Golan, Valeria Feinshtein, Ayelet David
The key for successful gene silencing is to design a safe and efficient siRNA delivery system for the transfer of therapeutic nucleic acids into the target cells. Here, we describe the design of hydrophilic N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer displaying multiple copies of octaarginine (R8) and its use in promoting the effective delivery of small interfering RNA (siRNA) molecules intracellularly. Fluorescein-5-isothiocyanate (FITC)-labeled HPMA copolymer-bound R8 (P-R8-FITC) was synthesized with increasing R8 molar ratios (4-9...
December 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27699089/in-vivo-fluorescence-imaging-of-hepatocellular-carcinoma-xenograft-using-near-infrared-labeled-epidermal-growth-factor-receptor-egfr-peptide
#13
Z Li, Q Zhou, J Zhou, X Duan, J Zhu, T D Wang
Minimally-invasive surgery of hepatocellular carcinoma (HCC) can be limited by poor tumor visualization with white light. We demonstrate systemic administration of a Cy5.5-labeled peptide specific for epidermal growth factor receptor (EGFR) to target HCC in vivo in a mouse xenograft model. We attached a compact imaging module to the proximal end of a medical laparoscope to collect near-infrared fluorescence and reflectance images concurrently at 15 frames/sec. We measured a mean target-to-background ratio of 2...
September 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27693557/dye-conjugated-single-walled-carbon-nanotubes-induce-photothermal-therapy-under-the-guidance-of-near-infrared-imaging
#14
Xiaoyuan Liang, Wenting Shang, Chongwei Chi, Chaoting Zeng, Kun Wang, Chihua Fang, Qingshan Chen, Huiyu Liu, Yingfang Fan, Jie Tian
Recently, photothermal therapy (PTT) has become viewed as an ideal auxiliary therapeutic treatment for cancers. However, the development of safe, convenient, and highly effective photothermal agents remains a great challenge. In this study, we prepared single-walled carbon nanotubes (SWNTs) for PTT against breast tumors under the guidance of infrared fluorescent cyanines. Tumors were accurately located using near-infrared imaging (NIR) and then exposed to laser irradiation. Both the in vivo and in vitro results showed that the SWNTs have high stability and low cytotoxicity...
September 30, 2016: Cancer Letters
https://www.readbyqxmd.com/read/27680307/spect-and-fluorescence-imaging-of-vulnerable-atherosclerotic-plaque-with-a-vascular-cell-adhesion-molecule-1-single-chain-antibody-fragment
#15
Chunbao Liu, Xiao Zhang, Yiling Song, Yichun Wang, Fengzhen Zhang, Yingying Zhang, Yongxue Zhang, Xiaoli Lan
BACKGROUND AND AIMS: Early detection and evaluation of vulnerable atherosclerotic plaque are important for risk stratification and timely intervention, and vascular cell adhesion molecule 1 (VCAM1) assists in adhesion and recruitment of inflammatory cells to vulnerable lesions. We labeled a single-chain variable fragment (scFv) of VCAM1 with (99m)technetium ((99m)Tc) and fluorescent markers to investigate its potential utility in detecting vulnerable plaques in animal models of atherosclerosis...
September 13, 2016: Atherosclerosis
https://www.readbyqxmd.com/read/27652266/near-infrared-fluorescence-imaging-of-carbonic-anhydrase-ix-in-athymic-mice-bearing-ht-29-tumor-xenografts
#16
Jianbo Li, Baoliang Bao, Lei Liu, Xuemei Wang
Near-infrared fluorescence (NIRF) imaging technology is a highly sensitive imaging modality and has been widely used in noninvasively studying the status of receptor expression in small animal models, with an appropriate NIRF probe targeting a specific receptor. In this report, Cy5.5-conjugated anti-CAIX monoclonal antibody (Mab-Cy5.5) was evaluated in athymic mice bearing HT-29 tumor xenografts in order to investigate the effect of conjugate on tumor targeting efficacy. In vitro binding studies showed that Mab-Cy5...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27628655/relationship-between-increased-fucosylation-and-metastatic-potential-in-colorectal-cancer
#17
Takahiro Osuga, Rishu Takimoto, Michihiro Ono, Masahiro Hirakawa, Makoto Yoshida, Yutaka Okagawa, Naoki Uemura, Yohei Arihara, Yasushi Sato, Fumito Tamura, Tsutomu Sato, Satoshi Iyama, Koji Miyanishi, Kohichi Takada, Tsuyoshi Hayashi, Masayoshi Kobune, Junji Kato
BACKGROUND: Fucose is utilized for the modification of different molecules involved in blood group determination, immunological reactions, and signal transduction pathways. We have recently reported that enhanced activity of the fucosyltransferase 3 and/or 6 promoted TGF-ß-mediated epithelial mesenchymal transition and was associated with increased metastatic potential of colorectal cancer (CRC), suggesting that fucose is required by CRC cells. With this in mind, we examined requirement of L-fucose in CRC cells and developed fucose-bound nanoparticles as vehicles for delivery of anticancer drugs specific to CRC...
September 2016: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/27624789/theranostic-polyaminocarboxylate-cyanine-transferrin-conjugate-for-anticancer-therapy-and-near-infrared-optical-imaging
#18
Chi Soo Kang, Siyuan Ren, Xiang Sun, Hyun-Soon Chong
Iron chelation therapy has been recognized as a promising antitumor therapeutic strategy. Herein we report a novel theranostic agent for targeted iron chelation therapy and near-infrared (NIR) optical imaging of cancers. The theranostic agent was prepared by incorporation of a polyaminocarboxylate-based cytotoxic chelating agent (N-NE3TA; 7-[2-[(carboxymethyl)amino]ethyl]-1,4,7-triazacyclononane-1,4-diacetic acid) and a NIR fluorescent cyanine dye (Cy5.5) onto a tumor-targeting transferrin (Tf). The N-NE3TA-Tf conjugate (without Cy5...
October 6, 2016: ChemMedChem
https://www.readbyqxmd.com/read/27616660/tumor-stroma-containing-3d-spheroid-arrays-a-tool-to-study-nanoparticle-penetration
#19
Dwi L Priwitaningrum, Jean-Baptiste G Blondé, Adithya Sridhar, Joop van Baarlen, Wim E Hennink, Gert Storm, Séverine Le Gac, Jai Prakash
Nanoparticle penetration through tumor tissue after extravasation is considered as a key issue for tumor distribution and therapeutic effects. Most tumors possess abundant stroma, a fibrotic tissue composed of cancer-associated fibroblasts (CAFs) and extracellular matrix (ECM), which acts as a barrier for nanoparticle penetration. There is however a lack of suitable in vitro systems to study the tumor stroma penetration of nanoparticles. In the present study, we developed and thoroughly characterized a 3D co-culture spheroidal array to mimic tumor stroma and investigated the penetration of silica and PLGA nanoparticles in these spheroids...
September 9, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27575055/polydopamine-nanotubes-as-an-effective-fluorescent-quencher-for-highly-sensitive-and-selective-detection-of-biomolecules-assisted-with-exonuclease-iii-amplification
#20
Daoqing Fan, Xiaoqing Zhu, Qingfeng Zhai, Erkang Wang, Shaojun Dong
In this work, the effective fluorescence quenching ability of polydopamine nanotubes (PDANTs) toward various fluorescent dyes was studied and further applied to fluorescent biosensing for the first time. The PDANTs could quench the fluorophores with different emission frequencies, aminomethylcoumarin acetate (AMCA), 6-carboxyfluorescein (FAM), 6-carboxytetramethylrhodamine (TAMRA), and Cy5. All the quenching efficiencies reached to more than 97%. Taking advantage of PDANTs' different affinities toward ssDNA and dsDNA and utilizing the complex of FAM-labeled ssDNA and PDANTs as a sensing platform, we achieved highly sensitive and selective detection of human immunodeficiency virus (HIV) DNA and adenosine triphosphate (ATP) assisted with Exonuclease III amplification...
September 20, 2016: Analytical Chemistry
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