Cell Meter™ Fluorimetric Intracellular Nitric Oxide (NO) Activity Assay Kit *Orange Fluorescence Optimized for Microplate Reader*
Nitric oxide (NO) is an important biological regulator involved in numbers of physiological and pathological processes. Altered NO production is implicated in various immunological, cardiovascular, neurodegenerative and inflammatory diseases. As a free radical, NO is rapidly oxidized and there is relatively low concentrations of NO existing in vivo. It has been challenging to detect and understand the role of NO in biological systems. Cell Meter™ Fluorimetric Intracellular Nitric Oxide Assay Kit provides a sensitive tool to monitor intracellular NO level in live cells. Nitrixyte™ probes are developed and used in our kit as an excellent replacement for DAF-2 for the detection and imaging of free NO in cells. Compared to the commonly used DAF-2 probe, Nitrixyte™ probes have better photostability and enhanced cell permeability. This particular kit uses Nitrixyte™ Orange that can react with NO to generate a bright orange fluorescent product that has spectral properties similar to Cy3® and TRITC. Nitrixyte™ Orange can be readily loaded into live cells, and its fluorescence signal can be conveniently monitored using the filter set of Cy3® or TRITC. This kit is optimized for fluorescence imaging and microplate reader applications.
Example protocol
AT A GLANCE
Protocol summary
- Prepare cells in growth medium
- Incubate cells with test compounds and Nitrixyte™ Orange working solution at 37oC for a desired period
- Add Assay Buffer II
- Monitor fluorescence intensity (bottom read mode ) at Ex/Em = 540/590 nm (Cutoff = 570 nm) or fluorescence microscope using TRITC filter
Important notes
Thaw all the kit components at room temperature before starting the experiment.
PREPARATION OF WORKING SOLUTION
Add 20 µL of 500X Nitrixyte™ Orange stock solution (Component A) into 10 mL of Assay Buffer I (Component B) and mix well to make Nitrixyte™ Orange working solution. This Nitrixyte™ Orange working solution is stable for at least 2 hours at room temperature. Protect from light. Note: 20 µL of 500X Nitrixyte™ Orange stock solution is enough for one plate.
For guidelines on cell sample preparation, please visit
https://www.aatbio.com/resources/guides/cell-sample-preparation.html
SAMPLE EXPERIMENTAL PROTOCOL
- To stimulate endogenous NO, treat cells with 10 µL of 10X test compounds (96-well plate) or 5 µL of 5X test compounds (384-well plate) in cell culture medium or your desired buffer (such as PBS or HHBS). For control wells (untreated cells), add the corresponding amount of medium or compound buffer. Note: It is not necessary to wash cells before adding compound. However, if tested compounds are serum sensitive, growth medium and serum factors can be aspirated away before adding compounds. Add 90 µL/well (96-well plate) and 20 µL/well (384-well plate) of 1X Hank’s salt solution and 20 mM Hepes buffer (HHBS) or the buffer of your choice after aspiration. Alternatively, cells can be grown in serum-free media.
- Add 100 µL/well (96-well plate) or 25 µL/well (384-well plate) of Nitrixyte™ Orange working solution in the cell plate. Co-incubate cells with test compound and Nitrixyte™ Orange working solution at 37°C for desired period of time, protected from light. Note: DO NOT remove the test compounds. For a NONOate positive control treatment: Cells were incubated with Nitrixyte™ Orange working solution at 37°C for 30 minutes. The working solution was removed and cells were further incubated with 1 mM DEA/NONOate at 37°C for 30 minutes to generate nitric oxide. Note: We have used Raw 264.7 cells incubated with 0.5X Nitrixyte™ Orange, 20 µg/mL of lipopolysaccharide (LPS) and 1 mM L-Arginine (L-Arg) in cell culture medium at 37°C for 16 hours. See Figure 1 for details.
- Remove solution in each well.
- Add Assay Buffer II (Component C) 100 µL/well for a 96-well plate or 25 µL/well for a 384-well plate. Note: DO NOT wash cells before adding Assay Buffer II.
- Monitor the fluorescence increase using microplate reader at Ex/Em = 540/590 nm (Cutoff = 570 nm) with bottom read mode, or take images using fluorescence microscope with a TRITC filter.
Spectrum
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Citations
View all 4 citations: Citation Explorer
New insights into posttranslational modifications of proteins during bull sperm capacitation
Authors: Mostek-Majewska, Agnieszka and Majewska, Anna and Janta, Anna and Ciereszko, Andrzej
Journal: Cell Communication and Signaling (2023): 1--23
Authors: Mostek-Majewska, Agnieszka and Majewska, Anna and Janta, Anna and Ciereszko, Andrzej
Journal: Cell Communication and Signaling (2023): 1--23
Inducible nitric oxide synthase (iNOS) is a novel negative regulator of hematopoietic stem/progenitor cell trafficking
Authors: Adamiak, Mateusz and Abdelbaset-Ismail, Ahmed and Moore, Joseph B and Zhao, J and Abdel-Latif, Ahmed and Wysoczynski, Marcin and Ratajczak, Mariusz Z
Journal: Stem cell reviews and reports (2017): 92--103
Authors: Adamiak, Mateusz and Abdelbaset-Ismail, Ahmed and Moore, Joseph B and Zhao, J and Abdel-Latif, Ahmed and Wysoczynski, Marcin and Ratajczak, Mariusz Z
Journal: Stem cell reviews and reports (2017): 92--103
Fluorescent real-time quantitative measurements of intracellular peroxynitrite generation and inhibition
Authors: Luo, Zhen and Zhao, Qin and Liu, Jixiang and Liao, Jinfang and Peng, Ruogu and Xi, Yunting and Diwu, Zhenjun
Journal: Analytical biochemistry (2017): 44--48
Authors: Luo, Zhen and Zhao, Qin and Liu, Jixiang and Liao, Jinfang and Peng, Ruogu and Xi, Yunting and Diwu, Zhenjun
Journal: Analytical biochemistry (2017): 44--48
Inducible Nitric Oxide Synthase (iNOS) Is a Novel Negative Regulator of Hematopoietic Stem/Progenitor Cell Trafficking
Authors: Adamiak, Mateusz and Abdelbaset-Ismail, Ahmed and Moore, Joseph B and Zhao, J and Abdel-Latif, Ahmed and Wysoczynski, Marcin and Ratajczak, Mariusz Z
Journal: Stem Cell Reviews and Reports (2016): 1--12
Authors: Adamiak, Mateusz and Abdelbaset-Ismail, Ahmed and Moore, Joseph B and Zhao, J and Abdel-Latif, Ahmed and Wysoczynski, Marcin and Ratajczak, Mariusz Z
Journal: Stem Cell Reviews and Reports (2016): 1--12
References
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