4000-520-616
欢迎来到免疫在线!(蚂蚁淘生物旗下平台)  请登录 |  免费注册 |  询价篮
aatbio(优势品牌)
主营:主营:研究并生产荧光和发光探针,信号转导研究的试剂
咨询热线电话
4000-520-616
当前位置: 首页 > 产品中心 > Other_biological_dyes > AAT Bioquest/Fluo-8H™, sodium salt/21095/10x50 ug
商品详细AAT Bioquest/Fluo-8H™, sodium salt/21095/10x50 ug
AAT Bioquest/Fluo-8H™, sodium salt/21095/10x50 ug
AAT Bioquest/Fluo-8H™, sodium salt/21095/10x50 ug
商品编号: 21095
品牌: aatbio
市场价: ¥56560.00
美元价: 33936.00
产地: 美国(厂家直采)
公司:
产品分类: 其他生物染料
公司分类: Other_biological_dyes
联系Q Q: 3392242852
电话号码: 4000-520-616
电子邮箱: info@ebiomall.com
商品介绍
Overview
Printer Friendly Version

Ex/Em (nm) 494/517
MW 802.60
CAS # N/A
Solvent Water
Storage F/D/L
Category GPCR
Calcium GPCR Assays
Related Calcium Channels
pH and Ion Indicators
Biochemical Assays
Calcium measurement is critical for numerous biological investigations. Fluorescent probes that show spectral responses upon binding Ca2+ have enabled researchers to investigate changes in intracellular free Ca2+ concentrations by using fluorescence microscopy, flow cytometry, fluorescence spectroscopy and fluorescence microplate readers. Fluo-3 and Fluo-4 are most commonly used among the visible light-excitable calcium indicators. However, Fluo-3 AM and Fluo-4 AM are only moderately fluorescent in live cells upon esterase hydrolysis, and require harsh cell loading conditions to maximize their cellular calcium responses. Fluo-8® dyes are developed to improve cell loading and calcium response while maintaining the convenient Fluo-3 and Fluo-4 spectral wavelength of maximum excitation @ ~490 nm and maximum emission @ ~520 nm. Fluo-8® AM only requires room temperature while Fluo-3 AM and Fluo-4 AM require 37 ?C cell loading. In addition, Fluo-8® is 2 times brighter than Fluo-4 AM, and 4 times brighter than Fluo-3 AM. AAT Bioquest offers a set of our outstanding Fluo-8® reagents with different calcium binding affinities (Fluo-8®: Kd = 389 nM; Fluo-8H: Kd = 232 nM; Fluo-8L: Kd = 1.86 µM; Fluo-8FF: Kd = 10 µM). We also offer versatile packing sizes to meet your special needs, e.g., 1 mg; 10x50 µg; 20x50 µg; HTS packages with no additional packaging charge.
Spectrum Advanced Spectrum Viewer

Sorry, your browser does not support inline SVG. Relative Intensity (%) 100 80 60 40 20 0 Sorry, your browser does not support inline SVG.
Sorry, your browser does not support inline SVG. Sorry, your browser does not support inline SVG.
Move mouse over grid to display wavelength & intensity values.

300
400
500
600
700
800
900
Wavelength (nm)


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

Use of Fluo-8® AM Esters

1. Load Cells with Fluo-8® AM Esters:

AM esters are the non-polar esters that readily cross live cell membranes, and rapidly hydrolyzed by cellular esterases inside live cells. AM esters are widely used for loading a variety of polar fluorescent probes into live cell non-invasively. However, cautions must be excised when AM esters are used since they are susceptible to hydrolysis, particularly in solution. They should be reconstituted just before use in high-quality, anhydrous dimethylsulfoxide (DMSO). DMSO stock solutions may be stored desiccated at –20 °C and protected from light. Under these conditions, AM esters should be stable for several months.

Following is our recommended protocol for loading Fluo-8® AM esters into live cells. This protocol only provides a guideline, and should be modified according to your specific needs.

a)       Prepare a 2 to 5 mM stock solution of Fluo-8® AM esters in high-quality, anhydrous DMSO.

b)       On the day of the experiment, either dissolve Fluo-8® in DMSO or thaw an aliquot of the indicator stock solution to room temperature. Prepare a working solution of 1 to 10 µM in Hanks and Hepes buffer (HHBS) or the buffer of your choice with 0.02% Pluronic® F-127. For most of cell lines, Fluo-8® reagents with a concentration ranging from 4-5 uM are recommended. The exact concentration of the indicator required for cell loading must be determined empirically. To avoid any artifacts caused by overloading and potential dye toxicity, it is recommended to use the minimal dye concentration that can generate sufficient signal strength.

Note: The nonionic detergent Pluronic® F-127 is sometimes used to increase the aqueous solubility of Fluo-8® AM esters.  A variety of Pluronic® F-127 solutions can be purchased from AAT Bioquest.

c)       If your cells containing the organic anion-transports, probenecid (1–2.5 mM) or sulfinpyrazone (0.1–0.25 mM) may be added to the cell medium to reduce leakage of the de-esterified indicators.

Note: A variety of ReadiUse™ probenecid including water soluble sodium salt and stabilized solution can be purchased from AAT Bioquest.

d)       Add equal volume of the dye working solution (from Step b or c) into your cell plate.

e)       Incubate the dye-loading plate at a cell incubator or room temperature for 20 minutes to one hour.

Note: Decreasing the loading temperature might reduce the compartmentalization of the indictor.

f)        Replace the dye working solution with HHBS or buffer of your choice (containing an anion transporter inhibitor, such as 2.5 mM probenecid, if applicable) to remove excess probes.

g)       Run the experiments at Ex/Em  = 490/525 nm

 

Use of Screen Quest™ Fluo-8 NW Calcium Assay Kits for HTS Applications

GPCR activation can be detected by direct measurement of the receptor mediated cAMP accumulation, or changes in intracellular Ca2+ concentration. GPCR targets that couple via Gq produce an increase in intracellular Ca2+ that can be measured using a combination of Fluo-8® reagents and a fluorescence microplate reader. The fluorescence imaging plate readers (such as, FLIPR™, FDSS or BMG NovoStar™) have a cooled CCD camera imaging system which collects the signal from each well of a microplate (both 96 and 384-well) simultaneously. These plate readers can read at sub-second intervals, which enables the kinetics of the response to be captured, and has an integrated pipettor that may be programmed for successive liquid additions. Besides their robust applications for GPCR targets, our Screen Quest™ Fluo-8 Calcium Assay Kits can be also used for characterizing calcium ion channels and screening calcium ion channel-targeted compounds.



Figure 2. Carbachol Dose Response was measured in HEK-293 cells with Screen Quest™ Fluo-8 NW Assay kit and Fluo-4 NW Assay Kit. HEK-293 cells were seeded overnight at 40,000 cells/100 µL/well in a 96-well black wall/clear bottom costar plate. The growth medium was removed, and the cells were incubated with, respectively, 100 µL of the Screen Quest™ Fluo 8-NW calcium assay kit and Fluo-4 NW kit (according to the manufacturer’s instructions) for 1 hour at room temperature. Carbachol (25µL/well) was added by NOVOstar (BMG LabTech) to achieve the final indicated concentrations. The EC50 of Fluo-8 NW is about 1.2 uM.

Compared to other commercial calcium assay kits that either based on Fluo-3 or Fluo-4, our Screen Quest™ Calcium Assay Kits have the following advantages for HTS applications:

Broad Applications: work with both GPCR and calcium channel targets.

Convenient Spectral Wavelengths: maximum excitation @ ~490 nm; maximum emission @ ~514 nm.

Flexible Dye Loading: dye loading at room temperature (rather than 37 ºC required for Fluo-4 AM).

No Wash Required and No Quencher Interference with Your Targets.

Robust Performance: enable calcium assays that are impossible with Fluo-4 AM or Fluo-3 AM.

Strongest Signal Intensity: 2 times brighter than that of Fluo-4 AM; 4 times brighter than that of Fluo-3 AM.

 

Use of Fluo-8® Salts

Calcium calibration can be carried out by measuring the fluorescence intensity of the salt form (25 to 50 µM in fluorescence microplate readers) of the indicators in solutions with precisely known free Ca2+ concentrations. Calibration solutions can be used based on 30 mM MOPS EGTA Ca2+ buffer. In general, water contains trace amount of calcium ion. It is highly recommended to use 30 mM MOPS + 100 mM KCl, pH 7.2 as buffer system. One can simply make a 0 and 39 µM calcium stock solutions as listed below, and these 2 solutions are used to make a serial solution of different Ca2+ concentrations

A. 0 µM calcium: 30 mM MOPS + 100 mM KCl, pH 7.2 buffer + 10 mM EGTA

B. 39 µM calcium: 30 mM MOPS + 100 mM KCl, pH 7.2 buffer + 10 mM EGTA + 10 mM CaCl2

 

To determine either the free calcium concentration of a solution or the Kd of a single-wavelength calcium indicator, the following equation is used:

[Ca]free = Kd[F ─ Fmin]/Fmax ─ F]

Where F is the fluorescence intensity of the indicator at a specific experimental calcium level, Fmin is the fluorescence intensity in the absence of calcium and Fmax is the fluorescence intensity of the calcium-saturated probe.

 

The dissociation constant (Kd) is a measure of the affinity of the probe for calcium. The calcium-binding and spectroscopic properties of fluorescent indicators vary quite significantly in cellular environments compared to calibration solutions. In situ response calibrations of intracellular indicators typically yield Kd values significantly higher than in vitro determinations. In situ calibrations are performed by exposing loaded cells to controlled Ca2+ buffers in the presence of ionophores such as A-23187, 4-bromo A-23187 and ionomycin. Alternatively, cell permeabilization agents such as digitonin or Triton® X-100 can be used to expose the indicator to the controlled Ca2+ levels of the extracellular medium. The Kd values of Fluo-8® reagents are listed in Table 1 for your reference.

References & Citations
Citation Explorer
Fluo-8® AM has been widely used to study calcium ions in critical biological processes across a span of different disciplines. Such processes include, but are not limited to, G protein-coupled receptor signaling pathways, calcium ion channel activity, intracellular/cytosolic Ca2+ flux and activation of cell receptors.

Below, you may find a small sampling of specific Fluo-8® AM applications sorted by field of study. To inquire about a potential application of Fluo-8® AM, or to consult with our fluorescent dye specialists, please contact us at support@aatbio.com or 1-800-990-8053.

In Oncology, Fluo-8® AM has been used to study:
» Breast cancer cells by monitoring intracellular Ca2+ flux associated with apoptosis and inhibition by 2-aminoethoxydiphenyl borate[1]
» Antitumor activity by way of thioredoxin-binding protein 2 and its dependence on intracellular calcium concentration[2]
» Bcl-1 and Bcl-2 regulation through characterization of cytosolic transport as quantified by calcium flux[3]
» Ca2+ influx and Ca2+ channel activity in NCI-H460 cells as a parameter for monitoring progression of non-small cell lung cancer[4]
» Ca2+ release by HN4 cells and CLIC4 upregulation of apoptosis through mitochondrial and endoplasmic reticulum pathways[5]

In Cardiology, Fluo-8® AM has been used to study:
» Low-energy far-field stimulation as a therapy for tachycardia and fibrillation[6]
» Calcium flux during calcium sparks in ventricular myocytes[7]
» Cardiac conduction as a function of cell rigidity in the context of cardiovascular disease[8]
» Diastolic Ca2+ transients in cardiac myocytes and SR-luminal and free cytoplasmic Ca2+ concentrations[9]
» Sphingosine-1-phosphate (S1P) receptor activation in valvular interstitial cells as detected by cytosolic Ca2+ flux[10]

In Neurobiology, Fluo-8® AM has been used to study:
» Hippocampal CA1 neurons, visualizating neurons to investigate the role of amyloid-β in the progression of Alzheimer's disease[11]
» Cytosolic Ca2+ concentrations in HEK293 cells and its regulatory effect on Aβ1-42 and hAmylin and associated signaling pathways [12]
» G protein-coupled receptors (GPRs) in response to cannabinoids in presynaptic CA3 or postsynaptic CA1 pyramidal cells [13]
» Medullary interneurons and dendritic calcium activity in regards to inspiratory bursts[14]
» N2a cell activation by histamine, as monitored by increases in intracellular Ca2+ concentrations[15]

In Stem Cells, Development & Differentiation, Fluo-8® AM has been used to study:
» Induction of pluripotent stem cells (iPSCs) into functioning cardiac cells, as validated by Ca2+ flux and membrane potential[16]
» CXCR4 and CXCR7 receptors in T cells and their role in cell survival and chemotaxis [17]
» Ca2+ uptake by myocytes derived from human induced pluripotent stem cells during pathogenesis of Duchenne muscular dystrophy[18]
» Agonist-induced calcium transients in differentiation of rat bone marrow mesenchymal stem cells into smooth muscle cells[19]
» Calcium channel blockades and their effect on cardiac progenitor cell proliferation and differentiation[20]

View More Citations
品牌介绍
美国AAT Bioquest Inc.(前身是ABD Bioquest,Inc.)是一家为从事生命科学研究、诊断研发及药物开发的科学家研发、生产和销售生物分析研究试剂和试剂盒的公司。公司致力于光谱学检测领域,包括吸收(颜色)、荧光和发光技术。AAT Bioquest的产品帮助全世界的科学家和生物医药研究者更好的了解生物化学、免疫学、细胞生物学和分子生物学等领域。AAT Bioquest会不断研发新产品,快速地丰富各个领域的产品。 1)提供反应探针和发光探针,生物素和端粒酶能够应用于标记药物小分子和生物聚合物,如蛋白、核酸以及其他碳水化合物; 2)研究并生产荧光和发光探针用于检测蛋白,核酸和活细胞; 3)不断推出新型的荧光和发光探针用于检测多种酶,特别是检测水解酶和氧化还原酶类; 4)致力于开发用于信号转导研究的试剂; 5)提供生理和神经探针,特别是钙离子指示剂和膜电位探针。
品牌分类
淋巴细胞信号传导 GPCR抗体 羰基活性生物素 细胞代谢 胺反应生物素 链霉亲和素结合物 生物素化抗IgGs 乙酰基特异性抗体 细胞骨架抗体
联络我们
服务热线:4000-520-616
(限工作日9:00-18:00)
QQ :1570468124
手机:18915418616