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2-NBDG

Catalog No.: GC10289

2-NBDG is a fluorescence-labeled 2-deoxy-glucose analog useful as a tracer for evaluation of cellular glucose metabolism (Ex/Em: 475/550 nm).

2-NBDG Chemical Structure

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Sample solution is provided at 25 µL, 10mM.

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Protocol

Procedure for 2-NBDG uptake assay for MEFs [1]

1. Mouse embryonic fibroblasts (MEFs) are isolated from the embryos of C57BL/6 WT mouse (13.5 days).

2. Culture the MEF cells until reaching 80-90% confluence in 10 cm Petri dishes with DMEM growth medium in a humidified cell culture incubator (37 °C, 5% CO2).
Note: Don’t use MEFs beyond passage 3. MEFs usually become senescent at about passage 4 to 5.

3. Remove culture medium and wash cells one time with 10 ml 1x PBS.

4. Trypsinize cells using 4 ml of 0.05% trypsin-EDTA for 3 min at 37 °C.

Note: Use room temperature or pre-warmed 1x PBS from Step A3 to Step A9. Using chilled 1x PBS after Step A9.

5. Transfer cells to 15 ml polystyrene centrifuge tubes.

6. Harvest cells at 200 x g for 5 min by centrifugation.

7. Wash pelleted cells one time with 5 ml 1x PBS.

8. Count cells using a hemocytometer chamber.

9. Incubate 1 x 106 MEF cells in a 37 °C water bath for 2 h with 1 ml of PBS containing 100 μM 2-NBDG. Incubate the same number of MEFs in the water bath with 1 ml PBS without 2-NBDG as a negative control.

10. Pellet the cells at 200 x g for 5 min by centrifugation. After washing the cells with chilled 1x PBS, the cells are pelleted at 200 x g for 5 min by centrifugation.

11. Resuspend cells in 0.5 ml of ice-cold 1x PBS with 2% FBS.
Note: Always keep cells on ice after this step.

12. Filter cells through a 35 µm nylon mesh (the cell-strainer cap of the 5 ml round-bottom polystyrene tubes) to obtain a uniform single-cell suspension in a 5 ml tube.

13. Keep the samples on ice until analysis on a flow cytometer.

14. Perform flow cytometric analysis. Acquire 10,000 single-cell events per reaction.

15. Analyze fluorescence intensity

Procedure for 2-NBDG uptake assay for breast cancer cells [1]

Using the same procedure as MEFs’ uptake assay except incubating 1 x 106 MCF7 cells in a 37 °C water bath only for 30 min (instead of two hours for MEFs) with 1 ml of PBS containing 100 μM 2-NBDG.

10 mM stock of 2-NBDG: Dissolve 5 mg 2-NBDG in 1.46 ml PBS. Store at -20 °C in the dark

This protocol only provides a guideline, and should be modified according to your specific needs

References:
[1]. Dong, S., Baranwal, S., Garcia, A., Serrano-Gomez, S. J., Eastlack, S., Iwakuma, T., Mercante, D., Mauvais-Jarvis, F. and Alahari, S. K. (2017). Nischarin inhibition alters energy metabolism by activating AMP-activated protein kinase. J Biol Chem 292(41): 16833-16846.

Background

2-NBDG is a fluorescence-labeled 2-deoxy-glucose analog useful as a tracer for evaluation of cellular glucose metabolism (Ex/Em: 475/550 nm).

excitation and emission of 2-NBDG

Glucose is a necessary source of energy for sustaining cell activities and homeostasis in tissues. Glucose metabolism is an important target in many diseases and changed with the pathological condition, therefore, evaluation of glucose metabolism can be a significant indication in disease progressions.

2-NBDG can be used in many kinds of cells in vitro, such as HepG2 human hepatocarcinoma cells, L6 rat skeletal muscle cells, MCF-7 breast cancer epithelial cells and astrocytes, it is also used in disease models, epilepsy rat, hyperglycemia, diabetes or mouse xenograft model of cancer.

2-NBDG enters cells through glucose transporters and is subsequently phosphorylated by hexokinase and trapped inside cells. Flow cytometric detection of fluorescence produced by cells can be performed to examine 2-NBDG uptake into living cells, and the intracellular concentration of transported 2-NBDG can be measured with a fluorescence microplate assay. It can be detected with a fluorescence imaging microscopy or CCD camera simply as well.

2-NBDG is a fluorescently labeled glucose tracer that is transported into cells by the same glucose transporter (GLUT) as glucose. Once 2-NBDG is taken up by cells, it is phosphorylated at the C-6 position to give 2-NBDG-6-phosphate, which is well retained in the cell. Compared to other glucose tracers such as 2-DG or FDG, 2-NBDG enables in situ measurement of 2-NBDG with high temporal and spatial resolution at the single-cell level. (suitable for fluorescence microscopy and flow cytometry detection)

Principle of 2-NBDG

Rationale for 2-NBDG glucose uptake assay in cells: Once 2 NBDG is taken up by cells, it is phosphorylated at the C-6 position to generate 2-NBDG-6-phosphate in 2 NBDG metabolism, which is well retained in the cell, the fluorescence intensity is proportional to the cellular glucose uptake activity.

References:
[1]. Zou C, Wang Y, Shen Z. 2-NBDG as a fluorescent indicator for direct glucose uptake measurement[J]. Journal of biochemical and biophysical methods, 2005, 64(3): 207-215.
[2]. O’Neil R G, Wu L, Mullani N. Uptake of a fluorescent deoxyglucose analog (2-NBDG) in tumor cells[J]. Molecular Imaging and Biology, 2005, 7(6): 388-392.
[3]. Tsytsarev V, Maslov K I, Yao J, et al. In vivo imaging of epileptic activity using 2-NBDG, a fluorescent deoxyglucose analog[J]. Journal of neuroscience methods, 2012, 203(1): 136-140.
[4]. Yan Chen, Junjian Zhang, Xiang-yang Zhang, 2-NBDG as a Marker for Detecting Glucose Uptake in Reactive Astrocytes Exposed to Oxygen-Glucose Deprivation In Vitro. J Mol Neurosci (2015) 55:126–130.
[5]. Tsytsarev V, Maslov K I, Yao J, et al. In vivo imaging of epileptic activity using 2-NBDG, a fluorescent deoxyglucose analog[J]. Journal of neuroscience methods, 2012, 203(1): 136-140.

FAQs / Troubleshooting

Why is there no significant difference in fluorescence staining intensity among 2-NBDG treatments?

Culture medium of 2-NBDG contains high level of glucose. Use culture medium which contains no glucose.

Why is 2-NBDG fluorescence intensity weak despite using highe concentration?

Cells were not starved before using 2-NBDG. Cells should be starved for 0.5-1 hr.

Chemical Properties

Cas No. 186689-07-6 SDF
Synonyms N/A
Chemical Name (3R,4R,5S,6R)-6-(hydroxymethyl)-3-((7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)amino)tetrahydro-2H-pyran-2,4,5-triol
Canonical SMILES OC[C@](O1)([H])[C@](O)([H])[C@@](O)([H])[C@](NC2=CC=C(N(=O)=O)C3=NON=C23)([H])C1([H])O
Formula C12H14N4O8 M.Wt 342.26
Solubility ≥ 17.1mg/mL in Water with ultrasonic Storage Store at -20°C
General tips For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.
Shipping Condition Evaluation sample solution : ship with blue ice
All other available size: ship with RT , or blue ice upon request

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Research Update

2-NBDG as a fluorescent indicator for direct glucose uptake measurement

J Biochem Biophys Methods2005 Sep 30;64(3):207-15.PMID: 16182371DOI: 10.1016/j.jbbm.2005.08.001

Evaluation of glucose uptake ability in cells plays a fundamental role in diabetes mellitus research. In this study, we describe a sensitive and non-radioactive assay for direct and rapid measuring glucose uptake in single, living cells. The assay is based on direct incubation of mammalian cells with a fluorescent d-glucose analog 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl) amino]-2-deoxy-D-glucose (2-NBDG) followed by flow cytometric detection of fluorescence produced by the cells. A series of experiments were conducted to define optimal conditions for this assay. By this technique, it was found that insulin lost its physiological effects on cells in vitro meanwhile some other anti-diabetic drugs facilitated the cell glucose uptake rates with mechanisms which likely to be different from those of insulin or those that were generally accepted of each drug. Our findings show that this technology has potential for applications in both medicine and research.

Quantification of 2-NBDG, a probe for glucose uptake, in GLUT1 overexpression in HEK293T cells by LC-MS/MS

Anal Biochem2021 Oct 15;631:114357.PMID: 34469746DOI: 10.1016/j.ab.2021.114357

The growth and proliferation of most cancer cells involve the excessive uptake of glucose mediated by glucose transporters. An effective strategy for cancer therapy has been to inhibit the GLUTs that are usually overexpressed in a variety of tumor cells. 2-NBDG is a GLUT1 substrate that can be used as a probe for GLUT1 inhibitors. An accurate and simple assay for 2-NBDG in a HEK293T cell model overexpressing GLUT1 was developed using liquid chromatography-tandem mass spectrometry. Chromatographic separation was achieved using a Xbridge? Amide column (3.5 ¦̭, 2.1 mm ¡Á 150 mm, Waters) with acetonitrile-water containing 2 ¦̍ ammonium acetate (80:20, v/v) at a flow rate of 0.25 mL/min. Mass detection was conducted in the parallel reaction monitoring (PRM) mode. The calibration curve for 2-NBDG showed good linearity in the concentration range of 5-500 ng/mL with satisfactory precision, a relative standard deviation ranging from 2.92 to 9.59% and accuracy with a relative error ranging from -13.14 to 7.34%. This method was successfully applied to quantify the uptake of GLUT1-mediated 2-NBDG, and the results clearly indicated inhibition of GLUT1 by WZB117 and quercetin (two potent glucose transporter inhibitors) in the GLUT1-HEK293T cell model. This study provides a convenient and accurate method for high-throughput screening of selective and promising GLUT1 inhibitors.

Characterization of a fluorescent glucose derivative 1-NBDG and its application in the identification of natural SGLT1/2 inhibitors

J Food Drug Anal2021 Sep 15;29(3):521-532.PMID: 35696243DOI: 10.38212/2224-6614.3371

Glucose is an important energy source for cells. Glucose transport is mediated by two types of glucose transporters: the active sodium-coupled glucose cotransporters (SGLTs), and the passive glucose transporters (GLUTs). Development of an easy way to detect glucose uptake by the cell can be valuable for research. 1-(N-(7-Nitrobenz-2-oxa-1,3-diazol-4-yl) amino)-1-deoxy-d-glucose (1-NBDG) is a newly synthesized fluorescent glucose analogue. Unlike 2-NBDG, which is a good substrate of GLUTs but not SGLTs, 1-NBDG can be transported by both GLUTs and SGLTs. Thus, 1-NBDG is useful for the screening of SGLT1 and SGLT2 inhibitors. Here we further characterized 1-NBDG and compared it with 2-NBDG. The fluorescence of both 1-NBDG and 2-NBDG was quenched under alkaline conditions, but only 1-NBDG fluorescence could be restored upon neutralization. HPLC analysis revealed that 2-NBDG was decomposed leading to loss of fluorescence, whereas 1-NBDG remained intact in a NaOH solution. Thus, after cellular uptake, 1-NBDG fluorescence can be detected on a plate reader simply by cell lysis in a NaOH solution followed by neutralization with an HCl solution. The fluorescence stability of 1-NBDG was stable for up to 5 h once cells were lysed; however, similar to 2-NBDG, intracellular 1-NBDG was not stable and the fluorescence diminished substantially within one hour. 1-NBDG uptake could also be detected at the single cell level and inhibition of 1-NBDG uptake by SGLT inhibitors could be detected by flow cytometry. Furthermore, 1-NBDG was successfully used in a high-throughput cell-based method to screen for potential SGLT1 and SGLT2 inhibitors. The SGLT inhibitory activities of 67 flavonoids and flavonoid glycosides purified from plants were evaluated and several selective SGLT1, selective SGLT2, as well as dual SGLT1/2 inhibitors were identified. Structure-activity relationship analysis revealed that glycosyl residues were crucial since the aglycon showed no SGLT inhibitory activities. In addition, the sugar inter-linkage and their substitution positions to the aglycon affected not only the inhibitory activities but also the selectivity toward SGLT1 and SGLT2.

Cellular binding and uptake of fluorescent glucose analogs 2-NBDG and 6-NBDG occurs independent of membrane glucose transporters

Biochimie2021 Nov;190:1-11.PMID: 34224807DOI: 10.1016/j.biochi.2021.06.017

The classical methods for determining glucose uptake rates in living cells involve the use of isotopically labeled 2-deoxy-d-glucose or 3-O-methyl-d-glucose, which enter cells via well-characterized membrane transporters of the SLC2A and SLC5A families, respectively. These classical methods, however, are increasingly being displaced by high-throughput assays that utilize fluorescent analogs of glucose. Among the most commonly used of these analogs are 2-NBDG and 6-NBDG, which contain a bulky 7-nitro-2,1,3-benzoxadiazol-4-yl-amino moiety in place of a hydroxy group on d-glucose. This fluorescent group significantly alters both the size and shape of these molecules compared to glucose, calling into question whether they actually enter cells by the same transport mechanisms. In this study, we took advantage of the well-defined glucose uptake mechanism of L929 murine fibroblasts, which rely exclusively on the Glut1/Slc2a1 membrane transporter. We demonstrate that neither pharmacologic inhibition of Glut1 nor genetic manipulation of its expression has a significant impact on the binding or uptake of 2-NBDG or 6-NBDG by L929 cells, though both approaches significantly impact [3H]-2-deoxyglucose uptake rates. Together these data indicate that 2-NBDG and 6-NBDG can bind and enter mammalian cells by transporter-independent mechanisms, which calls into question their utility as an accurate proxy for glucose transport.

Efficient and modified 2-NBDG assay to measure glucose uptake in cultured myotubes

J Pharmacol Toxicol Methods2021 May-Jun;109:107069.PMID: 33892108DOI: 10.1016/j.vascn.2021.107069

Under type-2 diabetes, insulin resistance develops in skeletal muscles as a key defect and to study the disorder, its manifestation, and possible solution, measurement of glucose uptake is a fundamental necessity. Of various approaches (i.e. scintillation counting, flow cytometry, fluorometry and spectrophotometry) fluorescent labelled glucose analogue, 2-NBDG solution is the most popular one. Although 2-NBDG based assay is the most widely used approach in various cells including skeletal muscle, even then all available protocols possess huge variability which impacts the overall data reproducibility. Moreover, starvation (use of glucose/serum free medium), one of the prerequisite condition for glucose uptake assay, itself induces stress specifically during longer pre-incubation periods and alters muscle cell metabolism and morphology, but the fact has not been duly considered. Therefore in the present article, using specific skeletal muscle cells i.e. C2C12 myotubes, we have re-established the conditions like pre-incubation time period, concentrations of insulin, glucose and serum/BSA while maintaining the cultured myotubes in morphologically healthy state. Our lab standardized protocols were observed to be effective in studying insulin resistance condition induced by diverse stresses (oxidative & inflammation) in myotubes. Comparative study conducted with already established protocols demonstrates that the present method is more efficient, effective and better improvised for studying glucose uptake in C2C12.

Keywords:

2-NBDG

186689-07-6

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