Improved Planar Amperometric Nitric Oxide Sensor Based on Platinized Platinum Anode. 1. Experimental Results and Theory When Applied for Monitoring NO Release from Diazeniumdiolate-Doped Polymeric Films

2004 ◽  
Vol 76 (3) ◽  
pp. 536-544 ◽  
Author(s):  
Youngmi Lee ◽  
Bong Kyun Oh ◽  
Mark E. Meyerhoff
Keyword(s):  
Nitric Oxide ◽  
Experimental Results ◽  
Polymeric Films ◽  
Platinum Anode ◽  
Nitric Oxide Sensor ◽  
Platinized Platinum ◽  
No Release

Decrease in ambient [Cl-] stimulates nitric oxide release from cultured rat mesangial cells

1994 ◽  
Vol 267 (1) ◽  
pp. F190-F195 ◽  
Author(s):  
H. Tsukahara ◽  
Y. Krivenko ◽  
L. C. Moore ◽  
M. S. Goligorsky
Keyword(s):  
Nitric Oxide ◽  
Mesangial Cells ◽  
Ionic Composition ◽  
Juxtaglomerular Apparatus ◽  
Cytosolic Calcium ◽  
No Synthase ◽  
Tubuloglomerular Feedback ◽  
No Production ◽  
Rapid Reduction ◽  
No Release

It has been hypothesized that fluctuations of the ionic composition in the interstitium of juxtaglomerular apparatus (JGA) modulate the function of extraglomerular mesangial cells (MC), thereby participating in tubuloglomerular feedback (TGF) signal transmission. We examined the effects of isosmotic reductions in ambient sodium concentration ([Na+]) and [Cl-] on cytosolic calcium concentration ([Ca2+]i) in cultured rat MC. Rapid reduction of [Na+] or [Cl-] in the bath induced a concentration-dependent rise in [Ca2+]i. MC are much more sensitive to decreases in ambient [Cl-] than to [Na+]; a decrease in [Cl-] as small as 14 mM was sufficient to elicit a detectable [Ca2]i response. These observations suggest that MC can be readily stimulated by modest perturbations of extracellular [Cl-]. Next, we examined whether activation of MC by lowered ambient [Cl-] influences cellular nitric oxide (NO) production. Using an amperometric NO sensor, we found that a 13 mM decrease in ambient [Cl-] caused a rapid, Ca2+/calmodulin-dependent rise in NO release from MC. This response was not inhibitable by dexamethasone, indicating the involvement of the constitutive rather than the inducible type of NO synthase in MC. In addition, the NO release was blunted by indomethacin pretreatment, suggesting that a metabolite(s) of cyclooxygenase regulates the activation of NO synthase in MC. Our findings that small perturbations in external [Cl-] stimulate MC to release NO, a highly diffusible and rapidly acting vasodilator, provide a possible mechanism to explain the transmission of the signal for the TGF response within the JGA.

Retracted Article: Light-triggered nitric oxide release and targeted fluorescence imaging in tumor cells developed from folic acid-graft-carboxymethyl chitosan nanospheres

RSC Advances ◽  
2014 ◽  
Vol 4 (57) ◽  
pp. 30129-30136 ◽  
Author(s):  
Rijun Gui ◽  
Ajun Wan ◽  
Yalei Zhang ◽  
Huili Li ◽  
Tingting Zhao
Keyword(s):  
Nitric Oxide ◽  
Folic Acid ◽  
Tumor Cells ◽  
Fluorescence Imaging ◽  
Carboxymethyl Chitosan ◽  
Nitric Oxide Release ◽  
No Release ◽  
Retracted Article ◽  
Potential Applications

This article reported the synthesis of CMC–FA–RBS(CQD) nanospheres and studied their potential applications for NO release and fluorescence imaging.

A Simple Silicon Based Nitric Oxide Sensor

1999 ◽  
Author(s):  
Marcelo Bariatto ◽  
Rogerio Furlan ◽  
Koiti Arakai ◽  
Jorge J. Santiago-Aviles
Keyword(s):  
Nitric Oxide ◽  
Amperometric Detection ◽  
Cellular Level ◽  
High Yield ◽  
Sensor Calibration ◽  
Nitric Oxide Sensor ◽  
Sensor Configuration

Abstract Nitric oxide (NO) is known to mediate many beneficial physiology processes, motivating its detection in vivo as well as in vitro. Electrochemical detection provides the required cellular level determination of NO among several other techniques. In this work, electrochemical micro-sensors for both types of detection, in vivo and in vitro, were developed, exploring the silicon planar technology, which presents high yield and reliability and also permits batch fabrication. The developed in vitro sensor features eight detection sites (10 μm × 10 μm microelectrodes), for determination of nitric oxide spatial distribution or multi-species analysis. Different electrochemical methods were applied to provide sensor calibration and chemical reproducibility. For in vivo analysis, the designed structures have a needle shape (40 μm thick) and they were silicon micro-machined by using plasma etching or etch stop techniques. Different configurations were designed and implemented, containing a number of detection microelectrodes that vary from 2 to 10. The amperometric detection of both nitric oxide and nitride (NO2−) — a molecule that causes an interference — were investigated by using the in vitro micro-sensor configuration. The need of a cationic exchanger (Nafion) was demonstrated in order to provide selectivity to NO for low concentrations. Also, the developed sensor has a sensitivity of 500 A/M.cm2 and a detection limit of 10 μM.

Hollow double-layered polymer nanoparticles with S-nitrosothiols for tumor targeted therapy

2017 ◽  
Vol 5 (36) ◽  
pp. 7519-7528 ◽  
Author(s):  
Tuanwei Liu ◽  
Jingjing Hu ◽  
Xiaoye Ma ◽  
Bing Kong ◽  
Jilan Wang ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Targeted Therapy ◽  
Polymer Nanoparticles ◽  
No Release

Tumor targeted hollow double-layered polymer nanoparticles (HDPNs) withS-nitrosothiols for nitric oxide (NO)-release as chemotherapy were described.

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