Annexin V-PE/7-AAD细胞凋亡检测试剂盒|Annexin V-PE/7-AAD Apoptosis Detection Kit

Annexin V-PE/7-AAD细胞凋亡检测试剂盒|Annexin V-PE/7-AAD Apoptosis Detection Kit

产品说明书

FAQ

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已发表文献

Annexin V-PE/7-AAD细胞凋亡检测试剂盒是用红色荧光染料PE(Phycoerythrin)标记的Annexin V作为探针,来检测细胞早期凋亡的发生,可用荧光显微镜、流式细胞仪或其他荧光检测设备进行检测。

其检测原理为:在正常的活细胞中,磷脂酰丝氨酸(phosphotidylserine,PS)位于细胞膜的内侧,但在早期凋亡的细胞中,PS 从细胞膜的内侧翻转到细胞膜的表面,暴露在细胞外环境中。Annexin-(膜联蛋白-V)是一种分子量为35-36KD的Ca2+ 依赖性磷脂结合蛋白,能与PS高亲和力结合。可通过细胞外侧暴露的磷脂酰丝氨酸与凋亡早期细胞的胞膜结合。

另外,本试剂盒中提供的7-AAD可用来区分存活的早期细胞和坏死或晚期凋亡细胞。7-AAD是一种核酸染料,同PI有着相似的荧光特性,但其发射光谱较PI窄,对其他检测通道的干扰更小,在多色荧光分析中是PI的最佳替代品,可与Annexin V联合使用。该染料不能透过正常细胞或早期凋亡细胞的完整的细胞膜,但可穿透晚期凋亡细胞或者坏死细胞并与其内的DNA结合。因此将Annexin V-PE7-AAD联合使用时,7-AAD则被排除在活细胞(Annexin V-/7-AAD-)和早期凋亡细胞(Annexin V+/7-AAD-)之外,而晚期凋亡细胞和坏死细胞同时被Annexin V-PE7-AAD结合染色呈现双阳性(Annexin V+/7-AAD+)。

 

产品组分

编号

组分名称

产品编号/规格

40310ES20

20T

40310ES50

50T

40310ES60

100T

40310-A

重组人Annexin V/PE*(rh Annexin V/PE)

100 µL

250 µL

500 µL

40310-B

7-AAD Viability Staining Solution(20µg/mL)

200 µL

500 µL

1.0 mL

40310-C

4×Binding Buffer**

4 mL

10 mL

20 mL

*来源于大肠杆菌(E.coli),分子量为35.8 KDa,纯度>98%(SDS-PAGE & HPLC)

 

运输与保存方法

冰袋(wet ice)运输。本试剂盒所有组分均在4 保存,勿冰冻Annexin V-PE、7-AAD需避光保存。一年有效。

 

注意事项

1)试剂在开盖前请短暂离心,将盖内壁上的液体甩至管底,避免开盖时液体洒落。

2)由于细胞凋亡是一个快速的过程,建议样品在染色后1小时之内进行分析。

3)对于贴壁细胞,消化是一个关键步骤。贴壁细胞诱导细胞凋亡时如有漂浮细胞,需收集漂浮细胞和贴壁细胞后合并染色。处理贴壁细胞时要小心操作,尽量避免人为的损伤细胞。胰酶消化时间过短,细胞需要用力吹打才能脱落,容易造成细胞膜的损伤,7-AAD摄入过多;消化时间过长,细胞膜同样易造成损伤,甚至会影响细胞膜上磷脂酰丝氨酸与Annexin V-PE的结合。消化时将胰酶铺满孔板底后,轻摇时胰酶与细胞充分接触,然后倒掉大部分胰酶,利用剩余的少量胰酶再消化一段时间,待细胞间空隙增大,瓶底呈花斑状即可终止。在消化液中尽量不用EDTA,EDTA会影响Annexin V与PS的结合。

4)如果样品来源于血液,请务必除去血液中的血小板。因为血小板含有PS,能与Annexin V结合,从而干扰实验结果。可以使用含有EDTA的缓冲剂并低速离心(200×g)洗去血小板,然后用Annexin V结合缓冲液清洗细胞,以避免残留的EDTA会螯合Ca2+

57-AAD为潜在致癌物,操作时请采取防护措施,穿防护服、戴手套等

6Annexin V-PE7-AAD是光敏物质,在操作时请注意避光。

7)本产品仅作科研用途!

 

使用说明

1. 样品染色

1) 悬浮细胞:300 g,4 ℃离心5 min收集细胞。

贴壁细胞:用不含EDTA的胰酶消化后,300g,4 ℃离心5 min收集细胞。胰酶消化时间不宜过长,以防引起假阳性。

2)配制1×Binding Buffer:用去离子水4倍稀释4×Binding Buffer4 mL 结合缓冲液+12 mL 去离子水)

3)4 ℃预冷的PBS洗涤细胞2次,每次均需300 g,4 ℃离心5 min。

4)加入250 μL 1×Binding Buffer重悬细胞,调节其浓度为1×106细胞/mL

5)取100 μL细胞悬液于5 mL流式管中,加入5 μL Annexin V/PE10 μL 7-AAD,轻轻混匀。

6)避光、室温反应15 min。

7)加入400 μL 1×Binding Buffer,混匀,样品在1小时内检测。

【注】:为了避免洗涤细胞时损失细胞,在吸液时可以用大的Tip头套上小的Tip头吸液。

2. 观察检测

A、流式细胞仪分析

1)用流式细胞仪检测,Annexin V-PE的激发波长Ex=488nm;发射波长Em=578 nm,发出橙红色荧光,建议使用FL2通道检测;7-AAD的激发波长Ex=546 nm;发射波长Em=647 nm,发出红色荧光,建议使用FL3通道检测CellQuest等软件进行分析,绘制双色散点图(two-color dot plot),PE为横坐标,7-AAD为纵坐标。每个样采集10,000 events。典型的实验中,细胞可以分成三个亚群,活细胞仅很低强度的背景荧光,早期凋亡细胞仅较强的橙红色荧光,晚期凋亡细胞呈橙红和红色荧光双重染色。

2)荧光补偿调节:使用未经凋亡诱导处理的正常细胞,作为对照进行荧光补偿调节去除光谱重叠和设定十字门的位置。

B、荧光显微镜观察

1)滴一滴上述染色后的细胞悬液于载玻片上,并用盖玻片盖上细胞;

2)对于贴壁细胞来说,也可直接用盖玻片来培养细胞并诱导细胞凋亡;

a 将细胞于盖玻片上生长,用适当的凋亡诱导剂诱导细胞凋亡,并设立阴性对照组;

b 用PBS洗涤细胞两次;

c 在500 μL的Binding Buffer 中加入1 μL Annexin V-PE,5 μL 7-AAD染液混匀;

d 将上述溶液滴加于盖玻片表面,使长有细胞的盖玻片表面均匀覆盖;

e 室温避光孵育5 min。

3)将盖玻片倒置于载玻片上,在荧光显微镜下用双色滤光片观察。滤光片(罗丹明)观察Annexin V-PE 荧光信号呈橙红色;用激发波长546 nm,发射波长647 nm,观察7-AAD荧光信号呈红色。

 

HB210802

 

Q:这两个试剂用什么通道检测?仪器是贝克曼的。

A: Annexin V-PE 的激发波长Ex=488nm;发射波长Em=578 nm,发出橙红色荧光,建议使用 FL2 通道检测;7-AAD 的激发波长 Ex=546 nm;发射波长 Em=647 nm,发出红色荧光, 建议使用 FL3 通道检测。

Q: Annexin V-PE 染色失败或者阳性率偏低。

A:首先要确定实验中使用的诱导剂是否能产生凋亡。可通过设定确切凋亡诱导效果的阳性药物对照来排除这一情况。Annexin V-PE 染色失败,最常见的实验操作原因是贴壁细胞消化不当。Annexin V 跟 PS 的结合需要 Ca2+,Binding Buffer 中含有 2.5 mM 的 Ca2+,含 EDTA 的胰酶消化会影响染色,建议使用无EDTA 的胰酶。若使用含EDTA 的胰酶,必须通过洗涤步骤彻底去除EDTA。用 PBS 洗涤细胞沉淀后,应尽量去除残余液体。残留PBS 中的磷酸根,会形成磷酸钙沉淀。Binding Buffer 的瓶盖要紧闭,防止空气中的 CO2 进入后形成碳酸钙沉淀,减少游离Ca2+,导致实验失败。接触其他缓冲液如吸取PBS 后不更换枪头也会导致游离的 Ca2+减少。一些细胞其细胞膜上 PS 的密度较低,染色效果很差,此时建议更换细胞株或者采用 TUNEL 试剂盒检测凋亡。如果是贴壁细胞,药物诱导后漂浮的细胞也要收集,这部分细胞往往是凋亡阳性的细胞,丢弃会造成阳性结果偏低。

Q: 假阳性

A: 实验中发现未经诱导凋亡的对照细胞经染色后Annexin V-PE/7-AAD 双阳性比例过高,造成这种结果的原因可能是细胞本身活力低。建议用台盼蓝染色计算细胞活力,阴性对照台盼蓝拒染的细胞应大于 95%。若细胞活力低,建议重新复苏细胞,通常刚复苏的细胞至少应传代 2– 3 次以后才能进行实验。另一可能是细胞操作不当引起,操作过程中吹打细胞过于剧烈,贴壁细胞消化过程中消化时间过长,均可能导致细胞膜破坏,出现假阳性。此外,一般情况下诱导几个小时就可以出现早期凋亡,因此通常不需要处理大于 48 h 以上;诱导时间过长会使营养物质耗尽,导致细胞状态差,假阳性结果偏高。

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Annexin V-PE/7-AAD细胞凋亡检测试剂盒是用红色荧光染料PE(Phycoerythrin)标记的Annexin V作为探针,来检测细胞早期凋亡的发生,可用荧光显微镜、流式细胞仪或其他荧光检测设备进行检测。

其检测原理为:在正常的活细胞中,磷脂酰丝氨酸(phosphotidylserine,PS)位于细胞膜的内侧,但在早期凋亡的细胞中,PS 从细胞膜的内侧翻转到细胞膜的表面,暴露在细胞外环境中。Annexin-(膜联蛋白-V)是一种分子量为35-36KD的Ca2+ 依赖性磷脂结合蛋白,能与PS高亲和力结合。可通过细胞外侧暴露的磷脂酰丝氨酸与凋亡早期细胞的胞膜结合。

另外,本试剂盒中提供的7-AAD可用来区分存活的早期细胞和坏死或晚期凋亡细胞。7-AAD是一种核酸染料,同PI有着相似的荧光特性,但其发射光谱较PI窄,对其他检测通道的干扰更小,在多色荧光分析中是PI的最佳替代品,可与Annexin V联合使用。该染料不能透过正常细胞或早期凋亡细胞的完整的细胞膜,但可穿透晚期凋亡细胞或者坏死细胞并与其内的DNA结合。因此将Annexin V-PE7-AAD联合使用时,7-AAD则被排除在活细胞(Annexin V-/7-AAD-)和早期凋亡细胞(Annexin V+/7-AAD-)之外,而晚期凋亡细胞和坏死细胞同时被Annexin V-PE7-AAD结合染色呈现双阳性(Annexin V+/7-AAD+)。

 

产品组分

编号

组分名称

产品编号/规格

40310ES20

20T

40310ES50

50T

40310ES60

100T

40310-A

重组人Annexin V/PE*(rh Annexin V/PE)

100 µL

250 µL

500 µL

40310-B

7-AAD Viability Staining Solution(20µg/mL)

200 µL

500 µL

1.0 mL

40310-C

4×Binding Buffer**

4 mL

10 mL

20 mL

*来源于大肠杆菌(E.coli),分子量为35.8 KDa,纯度>98%(SDS-PAGE & HPLC)

 

运输与保存方法

冰袋(wet ice)运输。本试剂盒所有组分均在4 保存,勿冰冻Annexin V-PE、7-AAD需避光保存。一年有效。

 

注意事项

1)试剂在开盖前请短暂离心,将盖内壁上的液体甩至管底,避免开盖时液体洒落。

2)由于细胞凋亡是一个快速的过程,建议样品在染色后1小时之内进行分析。

3)对于贴壁细胞,消化是一个关键步骤。贴壁细胞诱导细胞凋亡时如有漂浮细胞,需收集漂浮细胞和贴壁细胞后合并染色。处理贴壁细胞时要小心操作,尽量避免人为的损伤细胞。胰酶消化时间过短,细胞需要用力吹打才能脱落,容易造成细胞膜的损伤,7-AAD摄入过多;消化时间过长,细胞膜同样易造成损伤,甚至会影响细胞膜上磷脂酰丝氨酸与Annexin V-PE的结合。消化时将胰酶铺满孔板底后,轻摇时胰酶与细胞充分接触,然后倒掉大部分胰酶,利用剩余的少量胰酶再消化一段时间,待细胞间空隙增大,瓶底呈花斑状即可终止。在消化液中尽量不用EDTA,EDTA会影响Annexin V与PS的结合。

4)如果样品来源于血液,请务必除去血液中的血小板。因为血小板含有PS,能与Annexin V结合,从而干扰实验结果。可以使用含有EDTA的缓冲剂并低速离心(200×g)洗去血小板,然后用Annexin V结合缓冲液清洗细胞,以避免残留的EDTA会螯合Ca2+

57-AAD为潜在致癌物,操作时请采取防护措施,穿防护服、戴手套等

6Annexin V-PE7-AAD是光敏物质,在操作时请注意避光。

7)本产品仅作科研用途!

 

使用说明

1. 样品染色

1) 悬浮细胞:300 g,4 ℃离心5 min收集细胞。

贴壁细胞:用不含EDTA的胰酶消化后,300g,4 ℃离心5 min收集细胞。胰酶消化时间不宜过长,以防引起假阳性。

2)配制1×Binding Buffer:用去离子水4倍稀释4×Binding Buffer4 mL 结合缓冲液+12 mL 去离子水)

3)4 ℃预冷的PBS洗涤细胞2次,每次均需300 g,4 ℃离心5 min。

4)加入250 μL 1×Binding Buffer重悬细胞,调节其浓度为1×106细胞/mL

5)取100 μL细胞悬液于5 mL流式管中,加入5 μL Annexin V/PE10 μL 7-AAD,轻轻混匀。

6)避光、室温反应15 min。

7)加入400 μL 1×Binding Buffer,混匀,样品在1小时内检测。

【注】:为了避免洗涤细胞时损失细胞,在吸液时可以用大的Tip头套上小的Tip头吸液。

2. 观察检测

A、流式细胞仪分析

1)用流式细胞仪检测,Annexin V-PE的激发波长Ex=488nm;发射波长Em=578 nm,发出橙红色荧光,建议使用FL2通道检测;7-AAD的激发波长Ex=546 nm;发射波长Em=647 nm,发出红色荧光,建议使用FL3通道检测CellQuest等软件进行分析,绘制双色散点图(two-color dot plot),PE为横坐标,7-AAD为纵坐标。每个样采集10,000 events。典型的实验中,细胞可以分成三个亚群,活细胞仅很低强度的背景荧光,早期凋亡细胞仅较强的橙红色荧光,晚期凋亡细胞呈橙红和红色荧光双重染色。

2)荧光补偿调节:使用未经凋亡诱导处理的正常细胞,作为对照进行荧光补偿调节去除光谱重叠和设定十字门的位置。

B、荧光显微镜观察

1)滴一滴上述染色后的细胞悬液于载玻片上,并用盖玻片盖上细胞;

2)对于贴壁细胞来说,也可直接用盖玻片来培养细胞并诱导细胞凋亡;

a 将细胞于盖玻片上生长,用适当的凋亡诱导剂诱导细胞凋亡,并设立阴性对照组;

b 用PBS洗涤细胞两次;

c 在500 μL的Binding Buffer 中加入1 μL Annexin V-PE,5 μL 7-AAD染液混匀;

d 将上述溶液滴加于盖玻片表面,使长有细胞的盖玻片表面均匀覆盖;

e 室温避光孵育5 min。

3)将盖玻片倒置于载玻片上,在荧光显微镜下用双色滤光片观察。滤光片(罗丹明)观察Annexin V-PE 荧光信号呈橙红色;用激发波长546 nm,发射波长647 nm,观察7-AAD荧光信号呈红色。

 

HB210802

 

Q:这两个试剂用什么通道检测?仪器是贝克曼的。

A: Annexin V-PE 的激发波长Ex=488nm;发射波长Em=578 nm,发出橙红色荧光,建议使用 FL2 通道检测;7-AAD 的激发波长 Ex=546 nm;发射波长 Em=647 nm,发出红色荧光, 建议使用 FL3 通道检测。

Q: Annexin V-PE 染色失败或者阳性率偏低。

A:首先要确定实验中使用的诱导剂是否能产生凋亡。可通过设定确切凋亡诱导效果的阳性药物对照来排除这一情况。Annexin V-PE 染色失败,最常见的实验操作原因是贴壁细胞消化不当。Annexin V 跟 PS 的结合需要 Ca2+,Binding Buffer 中含有 2.5 mM 的 Ca2+,含 EDTA 的胰酶消化会影响染色,建议使用无EDTA 的胰酶。若使用含EDTA 的胰酶,必须通过洗涤步骤彻底去除EDTA。用 PBS 洗涤细胞沉淀后,应尽量去除残余液体。残留PBS 中的磷酸根,会形成磷酸钙沉淀。Binding Buffer 的瓶盖要紧闭,防止空气中的 CO2 进入后形成碳酸钙沉淀,减少游离Ca2+,导致实验失败。接触其他缓冲液如吸取PBS 后不更换枪头也会导致游离的 Ca2+减少。一些细胞其细胞膜上 PS 的密度较低,染色效果很差,此时建议更换细胞株或者采用 TUNEL 试剂盒检测凋亡。如果是贴壁细胞,药物诱导后漂浮的细胞也要收集,这部分细胞往往是凋亡阳性的细胞,丢弃会造成阳性结果偏低。

Q: 假阳性

A: 实验中发现未经诱导凋亡的对照细胞经染色后Annexin V-PE/7-AAD 双阳性比例过高,造成这种结果的原因可能是细胞本身活力低。建议用台盼蓝染色计算细胞活力,阴性对照台盼蓝拒染的细胞应大于 95%。若细胞活力低,建议重新复苏细胞,通常刚复苏的细胞至少应传代 2– 3 次以后才能进行实验。另一可能是细胞操作不当引起,操作过程中吹打细胞过于剧烈,贴壁细胞消化过程中消化时间过长,均可能导致细胞膜破坏,出现假阳性。此外,一般情况下诱导几个小时就可以出现早期凋亡,因此通常不需要处理大于 48 h 以上;诱导时间过长会使营养物质耗尽,导致细胞状态差,假阳性结果偏高。

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