Glucose oxidase and polydopamine functionalized iron oxide nanoparticles: combination of the photothermal effect and reactive oxygen species generation for dual-modality selective cancer therapy

2019 ◽  
Vol 7 (13) ◽  
pp. 2190-2200 ◽  
Author(s):  
Tiantian Zhang ◽  
Yinping Li ◽  
Weiying Hong ◽  
Zhiyong Chen ◽  
Peng Peng ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Iron Oxide ◽  
Cancer Therapy ◽  
Glucose Oxidase ◽  
Reactive Oxygen Species Generation ◽  
Photothermal Effect ◽  
Ros Generation ◽  
Oxide Nanoparticles ◽  
Oxygen Species ◽  
Anti Cancer

The combination of PTT and ROS generation results in selective anti-cancer effects.

Photo-Reactive Oxygen Species Boosting Strategy by Employing Mitochondrial Targeting Zinc-Doped Magnetic Nanoparticles to Enhance Anti-Cancer Therapy

Nano LIFE ◽  
2019 ◽  
Vol 09 (01n02) ◽  
pp. 1940005
Author(s):  
Congyu Wu ◽  
Ying Li ◽  
Jingjing Wang ◽  
Mengwei Chen ◽  
Yajing Shen ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Magnetic Nanoparticles ◽  
Cancer Therapy ◽  
Visible Region ◽  
Reactive Oxygen ◽  
Ros Generation ◽  
Oxygen Species ◽  
Mitochondrial Targeting ◽  
Intracellular Ros ◽  
Anti Cancer

The peroxidase-like functionality of iron oxide (IO) nanoparticles has attracted substantial attention in cancer treatment by reactive oxygen species (ROS) catalytic over-generation. However, the inefficient intracellular ROS generation still hurdles ready-to-use application of IO nanoparticles, attributing to the transient lifetime and limited diffusion distance of ROS. Indeed, excessive ROS generation in mitochondria is desirable to enhance cell death against cancer cells. In this study, we designed zinc-doped magnetic nanoparticles (MNPs) conjugated with triphenylphosphonium (TPP) for mitochondrial targeting. Moreover, the nanoparticles with high absorbance in visible region can catalyze ROS overproduction under visible light irradiation. Our platform provides a novel application of MNPs in targeted cancer therapy, which serves as a light-controlled switch to accelerate ROS generation and induce incremental cellular death.

Aspirin-triggered lipoxin A4 blocks reactive oxygen species generation in endothelial cells: A novel antioxidative mechanism

2007 ◽  
Vol 97 (01) ◽  
pp. 88-98 ◽  
Author(s):  
Christina Barja-Fidalgo ◽  
Vany Nascimento-Silva ◽  
Maria Arruda ◽  
Iolanda Fierro
Keyword(s):  
Reactive Oxygen Species ◽  
Endothelial Cells ◽  
Cardiovascular Diseases ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Protective Role ◽  
Ros Generation ◽  
Oxygen Species ◽  
Lipoxin A4 ◽  
Pre Treatment

SummaryLipoxins and their aspirin-triggered carbon-15 epimers have emerged as mediators of key events in endogenous anti-inflammation and resolution. However, the implication of these novel lipid mediators on cardiovascular diseases such as hypertension, atherosclerosis, and heart failure has not been investigated. One of the major features shared by these pathological conditions is the increased production of reactive oxygen species (ROS) generated by vascular NAD(P)H oxidase activation. In this study, we have examined whether an aspirin-triggered lipoxin A4 analog (ATL-1) modulates ROS generation in endothelial cells (EC). Pre-treatment of EC with ATL-1 (1–100 nM) completely blocked ROS production triggered by different agents, as assessed by dihydrorhodamine 123 and hydroethidine. Furthermore, ATL-1 inhibited the phosphorylation and translocation of the cytosplamic NAD(P)H oxidase subunit p47phox to the cell membrane as well as NAD(P)H oxidase activity. Western blot and immunofluorescence microscopy analyses showed that ATL-1 (100 nM) impaired the redox-sensitive activation of the transcriptional factor NF-κB, a critical step in several events associated to vascular pathologies. These results demonstrate that ATL-1 suppresses NAD(P)H oxidase-mediated ROS generation in EC, strongly indicating that lipoxins may play a protective role against the development and progression of cardiovascular diseases.

scholarly journals Ultrasound-induced reactive oxygen species generation and mitochondria-specific damage by sonodynamic agent/metal ion-doped mesoporous silica

RSC Advances ◽  
2019 ◽  
Vol 9 (68) ◽  
pp. 39924-39931 ◽  
Author(s):  
Kecan Lin ◽  
Ziguo Lin ◽  
Yujie Li ◽  
Youshi Zheng ◽  
Da Zhang
Keyword(s):  
Reactive Oxygen Species ◽  
Tumor Microenvironment ◽  
Cancer Therapy ◽  
Mesoporous Silica ◽  
Metal Ion ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Oxygen Species

Herein, we design tumor microenvironment specific active nano sono-chemodynamic agent for synergistic photodynamic–chemodynamic cancer therapy.

scholarly journals Plasmonic Hot-Electron Reactive Oxygen Species Generation: Fundamentals for Redox Biology

2020 ◽  
Vol 8 ◽  
Author(s):  
Elisa Carrasco ◽  
Juan Carlos Stockert ◽  
Ángeles Juarranz ◽  
Alfonso Blázquez-Castro
Keyword(s):  
Reactive Oxygen Species ◽  
Near Infrared ◽  
Chemical Reactivity ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Ros Generation ◽  
Oxygen Species ◽  
Hot Electron ◽  
Redox Biology

For decades, the possibility to generate Reactive Oxygen Species (ROS) in biological systems through the use of light was mainly restricted to the photodynamic effect: the photoexcitation of molecules which then engage in charge- or energy-transfer to molecular oxygen (O2) to initiate ROS production. However, the classical photodynamic approach presents drawbacks, like per se chemical reactivity of the photosensitizing agent or fast molecular photobleaching due to in situ ROS generation, to name a few. Recently, a new approach, which promises many advantages, has entered the scene: plasmon-driven hot-electron chemistry. The effect takes advantage of the photoexcitation of plasmonic resonances in metal nanoparticles to induce a new cohort of photochemical and redox reactions. These metal photo-transducers are considered chemically inert and can undergo billions of photoexcitation rounds without bleaching or suffering significant oxidative alterations. Also, their optimal absorption band can be shape- and size-tailored in order to match any of the near infrared (NIR) biological windows, where undesired absorption/scattering are minimal. In this mini review, the basic mechanisms and principal benefits of this light-driven approach to generate ROS will be discussed. Additionally, some significant experiments in vitro and in vivo will be presented, and tentative new avenues for further research will be advanced.

scholarly journals The Involvement of the Tyrosine Kinase c-Src in the Regulation of Reactive Oxygen Species Generation Mediated by NADPH Oxidase-1

2008 ◽  
Vol 19 (7) ◽  
pp. 2984-2994 ◽  
Author(s):  
Davide Gianni ◽  
Ben Bohl ◽  
Sara A. Courtneidge ◽  
Gary M. Bokoch
Keyword(s):  
Reactive Oxygen Species ◽  
Nadph Oxidase ◽  
Tyrosine Kinase ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Tumor Formation ◽  
Ros Generation ◽  
Oxygen Species ◽  
Human Colon Carcinoma Cell ◽  
Kinase C

NADPH oxidase (Nox) family enzymes are one of the main sources of cellular reactive oxygen species (ROS), which have been shown to function as second messenger molecules. To date, seven members of this family have been reported, including Nox1-5 and Duox1 and -2. With the exception of Nox2, the regulation of the Nox enzymes is still poorly understood. Nox1 is highly expressed in the colon, and it requires two cytosolic regulators, NoxO1 and NoxA1, as well as the binding of Rac1 GTPase, for its activity. In this study, we investigate the role of the tyrosine kinase c-Src in the regulation of ROS formation by Nox1. We show that c-Src induces Nox1-mediated ROS generation in the HT29 human colon carcinoma cell line through a Rac-dependent mechanism. Treatment of HT29 cells with the Src inhibitor PP2, expression of a kinase-inactive form of c-Src, and c-Src depletion by small interfering RNA (siRNA) reduce both ROS generation and the levels of active Rac1. This is associated with decreased Src-mediated phosphorylation and activation of the Rac1-guanine nucleotide exchange factor Vav2. Consistent with this, Vav2 siRNA that specifically reduces endogenous Vav2 protein is able to dramatically decrease Nox1-dependent ROS generation and abolish c-Src-induced Nox1 activity. Together, these results establish c-Src as an important regulator of Nox1 activity, and they may provide insight into the mechanisms of tumor formation in colon cancers.

Fabrication of magnesium oxide nanoparticles by solvent alteration and their bactericidal applications

2019 ◽  
Vol 7 (26) ◽  
pp. 4141-4152 ◽  
Author(s):  
Proma Bhattacharya ◽  
Sarpras Swain ◽  
Lopamudra Giri ◽  
Sudarsan Neogi
Keyword(s):  
Reactive Oxygen Species ◽  
Magnesium Oxide ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Oxide Nanoparticles ◽  
Oxygen Species ◽  
Mgo Nanoparticles ◽  
Antibacterial Ability ◽  
Ctab Solution ◽  
Magnesium Oxide Nanoparticles

MgO nanoparticles are synthesized using water, ethanol and aqueous CTAB solution. The nanoparticles synthesized in ethanol exhibited smallest size, maximum reactive oxygen species generation and maximum antibacterial ability, and low haemolysis.

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