钙离子荧光探针Fluo8FF钾盐
| Ex (nm) | 495 | Em (nm) | 516 |
| 分子量 | 913.05 | 溶剂 | Water |
| 存储条件 | 在零下15度以下保存, 避免光照 |
钙离子荧光探针Fluo-8FF,钾盐是美国AAT Bioquest生产的用于钙通量测定的试剂，钙测量对于许多生物学研究至关重要。在结合Ca2+后显示光谱响应的荧光探针使研究人员能够使用荧光显微镜，流式细胞仪，荧光光谱和荧光酶标仪来研究细胞内游离Ca2+浓度的变化。在可见光激发钙指示剂中，Fluo-3和Fluo-4常用。但是，Fluo-3 AM和Fluo-4 AM在酯酶水解后在活细胞中仅适度发荧光，并且需要苛刻的细胞加载条件才能大化其细胞钙反应。开发Fluo-8®染料可细胞负载和钙响应，同时保持便捷的Fluo-3和Fluo-4光谱波长（在〜490 nm处具有大激发和在〜520 nm处具有大发射）。Fluo-8®AM仅需要室温，而Fluo-3 AM和Fluo-4 AM需要37℃的细胞负载。此外，Fluo-8®的亮度是Fluo-4 AM的2倍，是Fluo-3 AM的4倍。AAT Bioquest提供了一套出色的Fluo-8®试剂，具有不同的钙结合亲和力（Fluo-8®：Kd = 389 nM； Fluo-8H：Kd = 232 nM； Fluo-8L：Kd = 1.86 µM； Fluo-8FF ：Kd = 10 µM）。百萤生物是AAT Bioquest 的中国代理商，为您提供优质的钙离子荧光探针Fluo-8FF,钾盐。
操作步骤
1.使用钙指示剂AM Esters加载细胞：
AM酯是非极性酯，其易于穿过活细胞膜，并且通过活细胞内的细胞酯酶快速水解。 AM酯广泛用于非侵入性地将各种极性荧光探针装载到活细胞中。 但是，使用AM酯时必须小心，因为它们易于水解，特别是在溶液中。 它们应在使用前用高质量的无水二甲基亚砜（DMSO）重新配制。 DMSO储备溶液应在-20°C下干燥储存并避光。 在这些条件下，AM酯应稳定数月。
以下是我们推荐的将AM酯加载到活细胞中的方案。该方案仅提供指南，实际情况应根据您的具体需求进行修改。
a）在高质量无水DMSO中制备2至5 mM AM酯原液。
b）在实验当天，将钙指示剂溶解在DMSO中或将等份的指示剂储备溶液解冻至室温。使用0.02％Pluronic®F-127在您选择的缓冲液（如Hanks和Hepes缓冲液）中制备1至10μM的工作溶液。对于大多数细胞系，我们建议钙指示剂的终浓度为4-5 uM。 细胞加载所需指标的确切浓度必须根据经验确定。 为避免因过载和潜在染料毒性引起的任何伪影，建议使用可产生足够信号强度的小探针浓度。
注意：非离子洗涤剂Pluronic®F-127有时用于增加钙指示剂AM酯的水溶性。
c）如果您的细胞含有有机阴离子转运蛋白，可以在细胞培养基中加入丙磺舒（1-2.5 mM）或磺吡酮（0.1-0.25 mM），以减少脱酯化指标的泄漏。 在室温或37°C下用钙指示剂酯孵育细胞20分钟至1小时。
d）在HHBS或您选择的缓冲液（含有阴离子转运蛋白抑制剂，如2.5mM丙磺舒，如果适用）中洗涤细胞1-2次以除去过量的探针。
e）在所需的Ex / Em波长下进行实验（见说明书中的表1）。
2.测量细胞内钙响应：
为了确定溶液的游离钙浓度或单波长钙指示剂的Kd，使用以下等式：[Ca]free = Kd[F - Fmin]/Fmax - F]
其中F是实验钙水平下指示剂的荧光，Fmin是不存在钙时的荧光，Fmax是钙饱和探针的荧光。 解离常数（Kd）是探针对钙的亲和力的量度。 与校准溶液相比，荧光指示剂的Ca2 +结合和光谱性质在细胞环境中变化非常显着。 细胞内指标的原位校准通常产生显着高于体外测定的Kd值。 通过在离子载体如A-23187,4-溴A-23187和离子霉素存在下将加载的细胞暴露于受控的Ca 2+缓冲液来进行原位校准。 或者，细胞透化剂如洋地黄皂苷或X-100可用于将指示剂暴露于细胞外培养基的受控Ca2 +水平。 说明书中的表1列出了一些钙试剂的Kd值供您参考。
试剂应用文献
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Methionine and valine activate the mammalian target of rapamycin complex 1 pathway through heterodimeric amino acid taste receptor (TAS1R1/TAS1R3) and intracellular Ca2+ in bovine mammary epithelial cells
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TRPA1-dependent reversible opening of tight junction by natural compounds with an $\alpha$, $\beta$-unsaturated moiety and capsaicin
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A new electro-optical approach for conductance measurement: an assay for the study of drugs acting on ligand-gated ion channels
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Bystander effects elicited by single-cell photo-oxidative blue-light stimulation in retinal pigment epithelium cell networks
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Journal: Cell Death Discovery (2017): 16071
High-throughput screen detects calcium signaling dysfunction in typical sporadic autism spectrum disorder
Authors: Schmunk, Galina and Nguyen, Rachel L and Ferguson, David L and Kumar, Kenny and Parker, Ian and Gargus, J Jay
Journal: Scientific Reports (2017): 40740
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相关产品
| 产品名称 | 货号 |
| 钙离子荧光探针Cal-520 , AM | Cat#21130 |
| 钙离子荧光探针Fluo-8, AM | Cat#21080 |
| 新型钙离子荧光探针Calbryte 520, AM *细胞渗透性* | Cat#20650 |
