Read by QxMD icon Read


Jun Ma, Lei Zhan, Rong Sheng Li, Peng Fei Gao, Cheng Zhi Huang
For the first time, the scattering light of noble nanoparticles was applied for the simultaneous detection of dual cancer biomarkers. Two nanoprobes with dual scattering light colors were used for the simultaneous imaging of alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA) based on the sandwich-type immunoassay. Since AFP can combine anti-AFP-modified gold nanoparticles which have green scattering light under dark-field microscopic imaging (iDFM) technique while CEA can conjugate anti-CEA-immobilized silver nanoparticles which have blue scattering light, the simultaneous determination of AFP and CEA can be achieved by separately counting the number of green and blue light spots in iDFM technique...
July 21, 2017: Analytical Chemistry
Xiaolong Zhang, Naishun Liao, Geng Chen, Aixian Zheng, Yongyi Zeng, Xiaolong Liu, Jingfeng Liu
Herein, a novel dual-responsive two-color fluorescent nanoprobe has been designed for the fluorescence activation imaging of cell apoptosis in living cells. The nanoprobe consists of a gold nanoparticle core functionalized with a dense layer of DNA aptamers and peptides, which shows high affinity and specific response to cytochrome c (Cyt c) and caspase-3, respectively. The formation of the aptamer-Cyt c complex and the cleavage of the specific peptide by caspase-3 can liberate the dye labelled aptamers and peptides from the surface of gold nanoparticles, and then recover their fluorescence...
July 21, 2017: Nanoscale
Simon R Hemelaar, Kiran J van der Laan, Sophie R Hinterding, Manon V Koot, Else Ellermann, Felipe P Perona-Martinez, David Roig, Severin Hommelet, Daniele Novarina, Hiroki Takahashi, Michael Chang, Romana Schirhagl
Fluorescent nanodiamonds (FNDs) are promising nanoprobes, owing to their stable and magnetosensitive fluorescence. Therefore they can probe properties as magnetic resonances, pressure, temperature or strain. The unprecedented sensitivity of diamond defects can detect the faint magnetic resonance of a single electron or even a few nuclear spins. However, these sensitivities are only achieved if the diamond probe is close to the molecules that need to be detected. In order to utilize its full potential for biological applications, the diamond particle has to enter the cell...
July 19, 2017: Scientific Reports
Song Wang, Mengchan Xia, Jie Liu, Sichun Zhang, Xinrong Zhang
We constructed a DNA tetrahedron based multicolor nanoprobe, which could simultaneously imaging of three tumor-related mRNAs in living cells through fluorescence restoration caused by competitive chain replacement reaction. The oligonucleotides used to construct the tetrahedron were extended by adding three 21-base recognition sequences modified with different fluorophores (FAM, Cy3, and Cy5) in the 5' end. Three 11-base complementary sequences modified with quencher (BHQ1 for FAM and BHQ2 for Cy3 and Cy5) were hybridized with the recognition sequences to quench the fluorescence...
June 23, 2017: ACS Sensors
Yasaman Ahmadi, Genady Kostenich, Mor Oron-Herman, Wolfgang Wadsak, Markus Mitterhauser, Arie Orenstein, Siroos Mirzaei, Peter Knoll
To cut the high mortality rate of malignant disease such as pancreatic cancer, development of newly diagnostic probes for early stage detection of tumor lesions is required. Multimodal imaging nanoprobes allowing targeted and real time functional/anatomical imaging of tumors meet the demands. For this purpose, a MRI/optical dual-modality probe based on biodegradable magnetic iron oxide nanoworms has been developed. The cross-linked surface of nanoworms were anchored to fluorescent dyes and to FITC.PTR86; a novel synthetic peptide with high affinity towards somatostatin receptors...
July 6, 2017: Colloids and Surfaces. B, Biointerfaces
Yanan Wu, Jin Huang, Xiaohai Yang, Yanjing Yang, Ke Quan, Nuli Xie, Jing Li, Changbei Ma, Kemin Wang
A new class of intracellular nanoprobe, termed AuNP loaded split-DNAzyme-probe, was developed to sense miRNA in living cells. Briefly, it consists of an AuNP and substrates hybridized with two half of split DNAzymes. In the absence of target miRNA, the split DNAzymes form an inactive DNAzyme motif with their substrate through partial paring at the end of each strand, and the fluorescence is quenched. Inside the cells, the target miRNA binds with both of the two half of split DNAzymes, forming the active secondary structure in the catalytic cores, which can cleave the substrates, resulting in the rupture of the substrate and recovery of the fluorescence...
July 18, 2017: Analytical Chemistry
Muhammad Nasir, Sajid Rauf, Nawshad Muhammad, Mian Hasnain Nawaz, Aqif Anwar Chaudhry, Muhammad Hamza Malik, Shakir Ahmad Shahid, Akhtar Hayat
Nanoparticles proved a viable alternative to the already used sensing and diagnostics methods due to their low cost, good stability, easy availability and easy synthesis. In the present approach, nitrogen doped titania nanoparticles are prepared through freeze drying method, and subsequently stabilized through ionic liquid. These nanoparticles were characterized through various techniques such as X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), BET pore size and surface area analyzer, X-ray photoelectron spectroscopy (XPS) and UV-Visible diffuse reflectance spectroscopy (UV-Vis...
July 6, 2017: Journal of Colloid and Interface Science
Na Huang, Xu Chen, Xufeng Zhu, Mengmeng Xu, Jie Liu
Bacterial infection has been a threat to human health, and so early diagnosis and treatment of bacterial infection is an urgent problem that needs to be solved. In this work, a multifunctional theranostic selenium nanoplatform (Se@PEP-Ru NPs) with early imaging diagnosis and efficient treatment of bacterial infections was designed and constructed. First, the antibacterial peptide UBI29-41 (PEP) was linked to functionalized Selenium nanoparticles (NPs), which enhanced the stability of the antimicrobial peptide and also caused the nanocomposites to specifically target bacterial infection...
July 5, 2017: Biomaterials
Gonzálo Ramírez-García, Silvia Gutiérrez-Granados, Marco A Gallegos-Corona, Lourdes Palma-Tirado, Fanny d'Orlyé, Anne Varenne, Nathalie Mignet, Cyrille Richard, Minerva Martínez-Alfaro
The ZnGa1.995Cr0.005O4 persistent luminescence nanoparticles offer the promise of revolutionary tools for biological imaging with applications such as cell tracking or tumor detection. They can be re-excited through living tissues by visible photons, allowing observations without any time constraints and avoiding the undesirable auto-fluorescence signals observed when fluorescent probes are used. Despite all these advantages, their uses demand extensive toxicological evaluation and control. With this purpose, mice were injected with a single intravenous administration of hydroxylated or PEGylated persistent luminescence nanoparticles at different concentrations and then a set of standard tests were carried out 1day, 1 month and 6 months after the administration...
July 10, 2017: International Journal of Pharmaceutics
Yizhong Shen, Nan Zhang, Yidan Sun, Wei-Wei Zhao, Deju Ye, Jing-Juan Xu, Hong-Yuan Chen
Accurate detection of DNA is essential for the precise diagnosis of diseases. Here we report an activatable near-infrared (NIR) fluorescence nanoprobe (QD-Al-GFLX) composed of NIR quantum dots (QDs) and Al(III)-gatifloxacin (Al-GFLX) complexes for the sensitive detection of double-stranded DNA (dsDNA) both in aqueous solution and in living cells. We demonstrated that the initial strong NIR fluorescence of QDs in QD-Al-GFLX was quenched by the Al-GFLX complex via a photoinduced electron transfer (PET) mechanism...
July 18, 2017: ACS Applied Materials & Interfaces
Yao-Xin Lin, Yi Wang, Sheng-Lin Qiao, Hong-Wei An, Jie Wang, Yang Ma, Lei Wang, Hao Wang
Autophagic therapy is regarded as a promising strategy for disease treatment. Appropriate autophagy regulations in vivo play a crucial role in translating this new concept from benchside to bedside. So far, emerging technologies are required to spatially and quantitatively monitor autophagic process in vivo in order to minimize the cytotoxity concerns associated with autophagy-mediated therapy. We successfully demonstrate the "proof-of-concept" study on autophagy-mediated chemotherapy in mice. Here, we describe a photoacoustic (PA) nanoprobe based on "in vivo self-assembly" idea for real-time and quantitative detection of autophagy in mice for the first time...
June 30, 2017: Biomaterials
Haijun Yu, Chao Chen, Xiaodan Cao, Yueling Liu, Shengmin Zhou, Ping Wang
pH-dependent protein adsorption on mesoporous silica nanoparticle (MSN) was examined as a unique means for pH monitoring. Assuming that the degree of protein adsorption determines the distance separating protein molecules, we examined the feasibility of nanoscale pH probes based on fluorescence resonance energy transfer (FRET) between two fluorescent proteins (mTurquoise2 and mNeonGreen, as donor and acceptor, respectively). Since protein adsorption on MSN is pH-sensitive, both fluorescent proteins were modified to make their isoelectric points (pIs) identical, thus achieving comparable adsorption between the proteins and enhancing FRET signals...
July 7, 2017: Analytical and Bioanalytical Chemistry
Stefan Harmsen, Matthew A Wall, Ruimin Huang, Moritz F Kircher
The unique spectral signatures and biologically inert compositions of surface-enhanced resonance Raman scattering (SERRS) nanoparticles make them promising contrast agents for in vivo cancer imaging. Our SERRS nanoparticles consist of a 60-nm gold nanoparticle core that is encapsulated in a 15-nm-thick silica shell wherein the resonant Raman reporter is embedded. Subtle aspects of their preparation can shift their limit of detection by orders of magnitude. In this protocol, we present the optimized, step-by-step procedure for generating reproducible SERRS nanoparticles with femtomolar (10(-15) M) limits of detection...
July 2017: Nature Protocols
Jianjun Zheng, Wenzhi Ren, Tianxiang Chen, Jin Yinhua, Aijing Li, Kun Yan, Yijiao Wu, Aiguo Wu
Breast cancer accounts for nearly one in three cancers, and it is the most common cancer diagnosed among women. The death rate of breast cancer is estimated to 14%. Hence, accurate diagnosis in early stage and effective treatment in any stage are critical for the survival of breast cancer. Mammogram has been the most common technique administered to detect breast cancer. However, the radiation dose from mammogram is harmful to patients. Fortunately, magnetic resonance imaging (MRI) can diagnose breast cancer without any radiation dose, and enhanced MRI can make earlier and differential diagnosis...
July 5, 2017: Current Medicinal Chemistry
Jianhao Hua, Jian Yang, Yan Zhu, Chunxi Zhao, Yaling Yang
A novel carbon quantum dots (CQDs) was successfully prepared through one-step green hydrothermal method using polyacrylamide as carbon source. The prepared CQDs were characterized using TEM, XRD, XPS, FT-IR, UV-Vis, and fluorescence spectroscopy. The CQDs was demonstrated as nanoprobes for mercury ion detection, moreover, it demonstrated excitation-dependent and superior stability in acidic and alkaline media. Besides, the probe exhibited a good linearity range (0.25-50μM) and a low detection limit (13.48nM)...
July 2, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Thongchai Kaewphinit, Jutturong Ckumdee, Kosum Chansiri, Somchai Santiwatanakul
Loop-mediated isothermal amplification (LAMP) has been proposed as an inexpensive and easy to perform assay for molecular diagnostics. We present a novel strategy for the detection of LAMP amplicons derived from Mycobacterium tuberculosis by the use of Au-nanoprobes. When applied to a total of 93 clinical specimens, the LAMP assay demonstrated sensitivity and specificity higher than that of polymerase chain reaction and culture. The Au-nanoprobe augmented LAMP test platform with its advantages of robust reagents and a simple colorimetric detection method can be adapted easily for the rapid detection of other infectious disease agents at a low cost...
April 2017: Indian Journal of Medical Microbiology
Suraj Toraskar, Madhuri Gade, Sivakoti Sangabathuni, Hirekodathakallu V Thulasiram, Raghavendra Kikkeri
To investigate the effects of the heterogeneity and shape of glyco-nanoprobes on carbohydrate-protein interactions (CPIs), α-d-mannose- and β-d-galactose-linked homo- and heterogeneous glycodendrons were synthesized and immobilized on spherical and rod-shaped gold nanoparticles (AuNPs). Lectin and bacterial binding studies of these glyco-AuNPs clearly illustrate that multivalency and shape of AuNPs contribute significantly to CPIs than the heterogeneity of glycodendrons. Finally, bacterial infection of HeLa cells was effectively inhibited by the homogeneous glycodendron-conjugated rod-shaped AuNPs relative to their heterogeneous counterparts...
July 5, 2017: ChemMedChem
Yao-Xin Lin, Yi Wang, Hao Wang
Autophagy is closely related to various diseases, and is a diagnostic and therapeutic target for some diseases. In recent years, tremendous efforts have been made to develop excellent probes for detection of autophagy. Nanostructure-based probes are interesting and promising approaches for in vivo biological imaging due to their unique structural and functional characteristics, e.g., modulating pharmacokinetics property by biocompatible coatings, multimodality capacity by delivering multiple imaging agents and highly specific targeting by antibody ligands...
July 5, 2017: Small
Haodong Cui, Dehong Hu, Jingnan Zhang, Guanhui Gao, Ze Chen, Wenjun Li, Ping Gong, Zonghai Sheng, Lintao Cai
A well-designed gold nanoclusters-indocyanine green nanoprobes (Au NCs-INPs) have been developed by the conjugation of Au NCs assemblies with indocyanine green (ICG) for the therapeutic real-time monitoring based on fluorescence resonance energy transfer (FRET). The synthesized Au NCs-INPs demonstrated the improved cellular uptake and effective tumor targeting due to the enhanced permeability and retention (EPR) effect and the gp60-mediated SPARC combined transport pathway, suggesting excellent dual-modal near-infrared fluorescent (NIRF) and photoacoustic (PA) imaging...
July 4, 2017: ACS Applied Materials & Interfaces
Adukkadan N Ramya, Manu M Joseph, Santhi Maniganda, Varsha Karunakaran, Sreelekha T T, Kaustabh Kumar Maiti
Strategically fabricated theranostic nanocarrier delivery system is an unmet need in personalized medicine. Herein, this study reports a versatile folate receptor (FR) targeted nanoenvelop delivery system (TNEDS) fabricated with gold core silica shell followed by chitosan-folic acid conjugate surface functionalization by for precise loading of doxorubicin (Dox), resembled as Au@SiO2 -Dox-CS-FA. TNEDS possesses up to 90% Dox loading efficiency and internalized through endocytosis pathway leading to pH and redox-sensitive release kinetics...
July 3, 2017: Small
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"