使用Cal-520®AM,Cal-590 AM或Cal-630 AM酯类
1.使用Cal-520®,Cal-590 或Cal-630 AM酯类:
AM酯是非极性酯,其可以容易地穿过活细胞膜,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加载到活细胞中。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。它们应在使用前重新配制成高质量的无水二甲基亚砜(DMSO)。DMSO储备溶液可以在-20℃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Cal-520®AM,Cal-590 AM或Cal-630 AM酯加入活细胞的方案。该方案仅提供指南,应根据具体实验修改。
a)在高质量无水DMSO中制备2至5 mM Cal-520®AM,Cal-590 AM或Cal-630 AM酯的储备溶液。
b)在实验当天,将Cal-520®AM,Cal-590 AM或Cal-630 AM 溶解在DMSO中或将等份的指示剂储备溶液解冻至室温。在Hanks和Hepes缓冲液(HHBS)或您选择的缓冲液中使用0.04%Pluronic®F-127制备10至20μM的染料工作溶液。细胞加载所需指示剂的确切浓度必须凭经验确定。
注意:非离子型洗涤剂Pluronic®F-127有时用于增加Cal-520®AM,Cal-590 AM或Cal-630 AM 酯的水溶性。
c)如果您的细胞(如CHO细胞)含有有机阴离子转运蛋白,则可将丙磺舒(1-2 mM)加入染料工作溶液中(最终浓度为0.5-1 mM)以减少渗漏。
d)将等体积的染料工作溶液(来自步骤b或c)加入细胞板中。
e)将染料加载板在细胞培养箱中孵育60至90分钟,然后将板在室温下再孵育30分钟。
注意:孵育染料超过2小时可以为某些细胞系提供更好的信号强度。
f)用HHBS(如果适用)替换染料工作溶液,选择含有阴离子转运蛋白抑制剂(如1 mM丙磺舒)的缓冲液,以去除多余的探针。
g)在Ex / Em = 490 / 525nm(对于Cal-520 AM),540 / 5000nm(对于Cal-590 AM)或600 / 640nm(对于Cal-630 AM )进行实验。
2.测量细胞内钙响应:
图1. 没有丙磺舒的CHO-M1细胞中内源性P2Y受体对ATP的反应。在96孔黑壁/透明底板中,将CHO-M1细胞以每100μL/孔40,000个细胞接种过夜。将100μl的4μMFluo -3AM,Fluo- 4AM 或Cal202®AM在HHBS中加入孔中,并将细胞在37℃下孵育2小时。用100μlHHBS替换染料加载培养基,加入50μl300μMATP,然后使用FITC通道用荧光显微镜(Olympus IX71)成像。
图2. 用Cal-520 或Fluo-4 AM 测量的CHO-K1细胞中ATP刺激的内源性P2Y受体的钙响应。在96孔黑壁/透明底板中,将CHO-K1细胞以每100μL /孔50,000个细胞接种过夜。100μL的5 μ 中号的Fluo-4 AM或校准- 520® AM与(A)或不具有(B)2.5mM丙磺舒加入到细胞中,并将细胞在37下温育ø下进行2小时。 通过FlexStation(Molecular Devices)添加ATP(50μL/孔)以达到最终指示的浓度。
图3. CHO-K细胞中内源性P2Y受体对ATP的反应。将CHO-K细胞以每孔100μL每孔40,000个细胞接种过夜,在96孔黑壁/透明底板中。将100μl含有1mM丙磺舒的HHBS中的4μMCal590 AM或Cal 630 AM加入孔中,并将细胞在37℃下孵育2小时。将染料上样培养基替换为100μlHHBS和1mM丙磺舒,然后在添加50μl300μMATP 之前和之后使用TRITC通道用荧光显微镜(Olympus IX71)成像。
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