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https://www.readbyqxmd.com/read/29723757/dual-triggered-oxygen-self-supply-black-phosphorus-nanosystem-for-enhanced-photodynamic-therapy
#1
Jintong Liu, Ping Du, Hui Mao, Lei Zhang, Huangxian Ju, Jianping Lei
Nonspecific distribution of photosensitizer and the intrinsic hypoxic condition in the tumor microenvironment are two key factors limiting the efficacy of O2 -dependent photodynamic therapy (PDT). Herein, a dual-triggered oxygen self-supported nanosystem using black phosphorus nanosheet (BPNS) as both photosensitizer and nanocarrier was developed to enhance PDT for tumors within hypoxic microenvironment. The BPNS platform was functionalized with folate and a blocker DNA duplex of 5'-Cy5-aptamer-heme/3'-heme labeled oligonucleotides...
April 26, 2018: Biomaterials
https://www.readbyqxmd.com/read/29721086/a-supramolecular-approach-for-liver-radioembolization
#2
Silvia J Spa, Mick M Welling, Matthias N van Oosterom, Daphne D D Rietbergen, Mark C Burgmans, Willem Verboom, Jurriaan Huskens, Tessa Buckle, Fijs W B van Leeuwen
Hepatic radioembolization therapies can suffer from discrepancies between diagnostic planning (scout-scan) and the therapeutic delivery itself, resulting in unwanted side-effects such as pulmonary shunting. We reasoned that a nanotechnology-based pre-targeting strategy could help overcome this shortcoming by directly linking pre-interventional diagnostics to the local delivery of therapy. Methods: The host-guest interaction between adamantane and cyclodextrin was employed in an in vivo pre-targeting set-up...
2018: Theranostics
https://www.readbyqxmd.com/read/29675180/single-quantum-dot-based-nanosensor-for-sensitive-detection-of-5-methylcytosine-at-both-cpg-and-non-cpg-sites
#3
Zi-Yue Wang, Li-Juan Wang, Qianyi Zhang, Bo Tang, Chun-Yang Zhang
DNA methylation is an important epigenetic modification in human genomes. Herein, we develop a single quantum dot (QD)-based nanosensor for sensitive detection of DNA methylation at both CpG and non-CpG sites using tricyclic ligation chain reaction (LCR)-mediated QD-based fluorescence resonance energy transfer (FRET). We design two sets of DNA probes (X and Y, X' and Y') for methylated DNA assay. In the presence of thermostable DNA ligase, probes X and Y may adjacently hybridize with the methylated DNA to obtain the ligated XY products which may function as the templates for probes X' and Y' to generate the X'Y' products...
February 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29660974/in-vivo-spinal-distribution-of-cy5-5-fluorescent-dye-after-injection-via-the-lateral-ventricle-and-cisterna-magna-in-rat-model
#4
Kee-Hang Lee, Hyun Nam, Jeong-Seob Won, Ji-Yoon Hwang, Hye Won Jang, Sun-Ho Lee, Kyeung Min Joo
Objective: The purpose of this study was to find an optimal delivery route for clinical trials of intrathecal cell therapy for spinal cord injury in preclinical stage. Methods: We compared in vivo distribution of Cy5.5 fluorescent dye in the spinal cord region at various time points utilizing in vivo optical imaging techniques, which was injected into the lateral ventricle (LV) or cisterna magna (CM) of rats. Results: Although CM locates nearer to the spinal cord than the LV, significantly higher signal of Cy5...
April 18, 2018: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/29658319/preparation-of-poly-l-lysine-based-nanoparticles-with-ph-sensitive-release-of-curcumin-for-targeted-imaging-and-therapy-of-liver-cancer-in-vitro-and-in-vivo
#5
Dae Hyeok Yang, Hyun Joo Kim, Kyeongsoon Park, Jae Kwang Kim, Heung Jae Chun
Poly-l-lysine (PLL) nanoparticle (NP) system was prepared for the controlled release of curcumin (CUR) by pH stimuli, and its theranostic efficacy on cancer was compared to that of CUR solution in vitro and in vivo. Deoxycholic acid (DOCA), methoxy polyethylene glycol (MPEG) and cyanine 5.5 (cy5.5) were conjugated to the amine group of PLL through condensation reaction (PLL-DOCA-MPEG-cy5.5), followed by encapsulation of CUR by dialysis method (PLL-DOCA-MPEG-cy5.5/CUR NPs). The composition, morphology and size distribution of PLL-DOCA-MPEG-cy5...
November 2018: Drug Delivery
https://www.readbyqxmd.com/read/29652128/self-healing-organic-fluorophore-of-cyanine-conjugated-amphiphilic-polypeptide-for-near-infrared-photostable-bioimaging
#6
Tuanwei Li, Le Liu, Titao Jing, Zheng Ruan, Pan Yuan, Lifeng Yan
Photobleaching and biotoxicity are the main bottlenecks for organic fluorescent dyes applied in real-time dynamic monitoring of living cells. Here, an unnatural amino acid, 4-nitro-3-phenyl-l-alanine (NPA), was used as a scaffold to covalently link a near-infrared fluorophore Cy5.5 and an amphiphilic polypeptide, poly[oligo(ethylene glycol) methyl ether methacrylate]- block-poly[2-amino-N4 -(2-diisopropylamino-ethyl)-l-aspartic acid] (P(OEGMA)21 -P(Asp)16 -iPr), was then conjugated for increasing the photostability and improving the biocompatibility simultaneously...
May 2, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29624004/a-method-for-tracing-exogenous-dna-uptake-in-live-spermatozoa-and-embryos
#7
Y Mu, M Jiao, Y Zhao, J Lv, J Wang, J Hao, X Zhang, Q Kong, Z Liu
Sperm-mediated gene transfer(SMGT) is a simple method for producing transgenic animals. Due to the lack of repeatability in spermatozoa binding and internalization of exogenous DNA, the efficiency of SMGT is still low. Considering this point, the present work aims to develop a method for evaluating the spermatozoa capacity of binding exogenous DNA after co-incubation with DNA. The main approach is using a Cy5-labelled DNA to trace the exogenous DNA and assess the ability of spermatozoa to take up exogenous DNA...
March 2018: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29594427/fluorescence-turn-on-detection-of-target-sequence-dna-based-on-silicon-nanodot-mediated-quenching
#8
Yanan Zhang, Xinping Ning, Guobin Mao, Xinghu Ji, Zhike He
We have developed a new enzyme-free method for target sequence DNA detection based on the dynamic quenching of fluorescent silicon nanodots (SiNDs) toward Cy5-tagged DNA probe. Fascinatingly, the water-soluble SiNDs can quench the fluorescence of cyanine (Cy5) in Cy5-tagged DNA probe in homogeneous solution, and the fluorescence of Cy5-tagged DNA probe can be restored in the presence of target sequence DNA (the synthetic target miRNA-27a). Based on this phenomenon, a SiND-featured fluorescent sensor has been constructed for "turn-on" detection of the synthetic target miRNA-27a for the first time...
March 28, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29588255/tumor-targeting-cus-nanoparticles-for-multimodality-imaging-and-guided-photothermal-therapy-of-lymph-node-metastasis
#9
Hua Shi, Runqi Yan, Luyan Wu, Yidan Sun, Song Liu, Zhengyang Zhou, Jian He, Deju Ye
Precise diagnosis of lymph node metastasis to guide lymphadenectomy is highly important for gastric cancer therapy in clinics. Though surgical dissection of regional metastatic lymph nodes remains the only way for gastric cancer therapy, the extended dissection may cause unavoidable postoperative risk of complications. These is still lack of effective method enabling the accurate removal of metastatic gastric cancer cells in lymph nodes with minimum injuries to normal tissue. Herein, we report a new fluorescent copper sulfide (CuS) nanoparticle (RGD-CuS-Cy5...
March 24, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29578224/combining-gold-nanoparticle-antennas-with-single-molecule-fluorescence-resonance-energy-transfer-smfret-to-study-dna-hairpin-dynamics
#10
Jinyong Hu, Meiyan Wu, Li Jiang, Zhensheng Zhong, Zhangkai Zhou, Thitima Rujiralai, Jie Ma
The association of a plasmonic nano-antenna with single-molecule FRET technique presents new prospects to investigate the dynamics of biological molecules. However, the presence of a plasmonic nano-antenna significantly modifies the FRET rate and efficiency; this makes its applicability to the prevalent single-molecule FRET experiments unclear. Herein, using gold nanoparticle antennas of different sizes and DNA hairpins labelled with FRET pairs (Cy3 and Cy5) as the model system, we performed experiments to study the folding dynamics of single DNA hairpins at various salt concentrations...
March 26, 2018: Nanoscale
https://www.readbyqxmd.com/read/29566031/assessment-of-mmp-2-9-expression-by-fluorescence-endoscopy-for-evaluation-of-anastomotic-healing-in-a-murine-model-of-anastomotic-leakage
#11
Philipp-Alexander Neumann, Vanessa Twardy, Felix Becker, Christiane Geyer, Katrin Schwegmann, Annika Mohr, Andreas Faust, Philipp Lenz, Emile Rijcken
BACKGROUND: Disturbance of intestinal wound closure leads to insufficient anastomotic healing and is associated with considerable morbidity following colorectal resections. Matrix metalloproteinases (MMPs) play a crucial role in regulation of wound closure. Here fluorescence endoscopy was evaluated for assessment of MMP-2/-9 expression during failed intestinal anastomotic healing. METHODS: Distal colonic anastomoses were performed as a model for disturbed healing in 36 Balb/c mice...
2018: PloS One
https://www.readbyqxmd.com/read/29524794/design-synthesis-and-perception-of-fluorescently-labeled-isoprenoid-cytokinins
#12
Karolina Kubiasová, Václav Mik, Jaroslav Nisler, Martin Hönig, Alexandra Husičková, Lukáš Spíchal, Zuzana Pěkná, Olga Šamajová, Karel Doležal, Ondřej Plíhal, Eva Benková, Miroslav Strnad, Lucie Plíhalová
Isoprenoid cytokinins play a number of crucial roles in the regulation of plant growth and development. To study cytokinin receptor properties in plants, we designed and prepared fluorescent derivatives of 6-[(3-methylbut-2-en-1-yl)amino]purine (N6 -isopentenyladenine, iP) with several fluorescent labels attached to the C2 or N9 atom of the purine moiety via a 2- or 6-carbon linker. The fluorescent labels included dansyl (DS), fluorescein (FC), 7-nitrobenzofurazan (NBD), rhodamine B (RhoB), coumarin (Cou), 7-(diethylamino)coumarin (DEAC) and cyanine 5 dye (Cy5)...
June 2018: Phytochemistry
https://www.readbyqxmd.com/read/29501600/preparation-of-sirna-encapsulated-nanoliposomes-suitable-for-sirna-delivery-by-simply-discontinuous-mixing
#13
Amir Abbas Mokhtarieh, Jieun Lee, Semi Kim, Myung Kyu Lee
Previously a scalable and extrusion-free method has been developed for efficient liposomal encapsulation of DNA by twice stepwise mixing of lipids in ethanol and DNA solution using T-shape mixing chamber. In this study, we prepared nanoliposomes encapsulating siRNA by simply discontinuous mixing of lipids in ethanol/ether/water mixture and acidic siRNA solution without use of special equipment. The simple mixing siRNA/liposomal particles (siRNA/SMLs) prepared using ethanol/ether/water (3:1:1) mixture showed 120...
June 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29450407/changes-in-the-cardiac-ghsr1a-ghrelin-system-correlate-with-myocardial-dysfunction-in-diabetic-cardiomyopathy-in-mice
#14
Rebecca Sullivan, Rebecca McGirr, Shirley Hu, Alice Tan, Derek Wu, Carlie Charron, Tyler Lalonde, Edith Arany, Subrata Chakrabarti, Leonard Luyt, Savita Dhanvantari
Ghrelin and its receptor, the growth hormone secretagogue receptor 1a (GHSR1a), are present in cardiac tissue. Activation of GHSR1a by ghrelin promotes cardiomyocyte contractility and survival, and changes in myocardial GHSR1a and circulating ghrelin track with end-stage heart failure, leading to the hypothesis that GHSR1a is a biomarker for heart failure. We hypothesized that GHSR1a could also be a biomarker for diabetic cardiomyopathy (DCM). We used two models of streptozotocin (STZ)-induced DCM: group 1, adult mice treated with 35 mg/kg STZ for 3 days; and group 2, neonatal mice treated with 70 mg/kg STZ at days 2 and 5 after birth...
February 1, 2018: Journal of the Endocrine Society
https://www.readbyqxmd.com/read/29449447/tracers-for-fluorescence-guided-surgery-how-elongation-of-the-polymethine-chain-in-cyanine-dyes-alters-the-pharmacokinetics-of-a-bimodal-c-rgdyk-tracer
#15
Tessa Buckle, Danny M van Willigen, Silvia J Spa, Albertus W Hensbergen, Steffen van der Wal, Clarize M de Korne, Mick M Welling, Henk G van der Poel, James C H Hardwick, Fijs W B van Leeuwen
Objectives: The potential of (receptor-mediated) fluorescence-based image-guided surgery tracers is generally linked to the near-infrared emission profile and good manufacturing production (GMP) availability of fluorescent dyes. Surprisingly, little is known about the critical interaction between the structural composition of the dye and the pharmacokinetics of the tracers. In this study, a bimodal/hybrid tracer design was used to systematically and quantitatively evaluate the influence of elongation of the polymethine chain in a fluorescent cyanine (Cy) dye on the imaging potential of a targeted (RGD-based) tracer...
February 15, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29402740/synthesis-of-novel-multivalent-fluorescent-inhibitors-with-high-affinity-to-prostate-cancer-and-their-biological-evaluation
#16
Young-Do Kwon, Hea-Jong Chung, Sun Joo Lee, Sun-Hwa Lee, Byung-Hoon Jeong, Hee-Kwon Kim
Prostate-specific membrane antigen (PSMA) is an important biological target for therapy and diagnosis of prostate cancer. In this study, novel multivalent PSMA inhibitors with glutamate-urea-lysine structures were designed to improve inhibition characteristics. Precursors of the novel inhibitors were prepared from glutamic acid with di-tert-butyl ester. A near-infrared molecular dye, sulfo-Cy5.5, was introduced into the precursors to generate the final PSMA fluorescent inhibitors, compounds 12-14, to visualize prostate cancer...
February 15, 2018: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29370158/heat-induced-radiolabeling-and-fluorescence-labeling-of-feraheme-nanoparticles-for-pet-spect-imaging-and-flow-cytometry
#17
Hushan Yuan, Moses Q Wilks, Marc D Normandin, Georges El Fakhri, Charalambos Kaittanis, Lee Josephson
Feraheme (FH) nanoparticles (NPs) have been used extensively for treatment of iron anemia (due to their slow release of ionic iron in acidic environments). In addition, injected FH NPs are internalized by monocytes and function as MRI biomarkers for the pathological accumulation of monocytes in disease. We have recently expanded these applications by radiolabeling FH NPs for positron emission tomography (PET) or single-photon emission computed tomography (SPECT) imaging using a heat-induced radiolabeling (HIR) strategy...
February 2018: Nature Protocols
https://www.readbyqxmd.com/read/29311548/author-correction-targeted-gadofullerene-for-sensitive-magnetic-resonance-imaging-and-risk-stratification-of-breast-cancer
#18
Zheng Han, Xiaohui Wu, Sarah Roelle, Chuheng Chen, William P Schiemann, Zheng-Rong Lu
In the original version of this Article, the penultimate sentence of the Abstract incorrectly read 'The dose of the contrast agent for effective molecular MRI is only slightly lower than that of ZD2-Cy5.5 (0.5 µmol kg-1 ) in fluorescence imaging.' The correct version states 'higher' in place of 'lower'. This error has been corrected in both the PDF and HTML versions of the Article.
January 8, 2018: Nature Communications
https://www.readbyqxmd.com/read/29237264/dual-ratiometric-target-triggered-fluorescent-probe-for-simultaneous-quantitative-visualization-of-tumor-microenvironment-protease-activity-and-ph-in-vivo
#19
Tiancong Ma, Yi Hou, Jianfeng Zeng, Chunyan Liu, Peisen Zhang, Lihong Jing, Dihua Shangguan, Mingyuan Gao
The abnormal expression of tumor-associated proteases and lowered extracellular pH are important signatures strongly associated with cancer invasion, progression, and metastasis. However, their malignant effects were mainly identified using cell and tissue studies. To noninvasively visualize the heterogeneous distribution of these abnormal indicators in vivo and further disclose their collective behaviors, a target-triggered fluorescent nanoprobe composed of a ratiometric pH-sensitive dye, a near-infrared dye (Cy5...
January 10, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29195018/dendron-grafted-polylysine-based-dual-modal-nanoprobe-for-ultra-early-diagnosis-of-pancreatic-precancerosis-via-targeting-a-urokinase-type-plasminogen-activator-receptor
#20
Hui Li, Ping Wang, Wenyu Gong, Qi Wang, Jia Zhou, Wei-Hong Zhu, Yingsheng Cheng
Pancreatic ductal adenocarcinoma (PDAC) is one of the leading causes of cancer death. Early detection of precancerous pancreatic intraepithelial neoplasia (PanIN) tissues is an urgent challenge to improve the PDAC prognosis. Here, a urokinase-type plasminogen activator receptor (uPAR)-targeted magnetic resonance (MR)/near-infrared fluorescence (NIRF) dual-modal nanoprobe dendron-grafted polylysine (DGL)-U11 for ultra-early detection of pancreatic precancerosis is reported. Because of its good biocompatibility and biodegradability, globular architecture, and well-defined reactive groups, the DGL is chosen as the platform to load with a pancreatic tumor-targeting peptide U11, a magnetic resonance contrast agent Gd3+ -diethylene triamine pentaacetic acid, and a near-infrared fluorescent cyanine dye Cy5...
March 2018: Advanced Healthcare Materials
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