Dojindo,BCECF-AM/1/B262,BCECF 是使用细胞内 pH 探针

2022年4月29日 作者 jinpanbio
BCECF 是最广泛使用的细胞内 pH 探针。 Tsien 博士和其他人通过引入两种额外的羧酸盐来改进这种羧基荧光素,使其能够更好地被细胞保留。 BCECF 是高度水溶性的,因为它在中性 pH 下具有 4 至 5 个负电荷;加载后变得难以通过细胞膜。其 pKa 值为 6.97,高于羧基荧光素。 BCECF在激发光谱中在439 nm处有一个等吸收点,因此可用于比率测定,类似于Fura 2。比率测定通常使用505 nm和439 nm的波长,设置490 nm和450 nm滤光片在激发光源前。 530 nm 滤光片用于其荧光信号。请注意,激发光谱与吸收光谱略有不同。 BCECF-AM 是 BCECF 的乙酰氧基甲酯,可以轻松地将 BCECF 加载到细胞中。 BCECF-AM 与其他乙酰氧基甲酯一样,仅通过孵育才能在细胞中积累。 BCECF-AM 对水分非常敏感;应该小心处理。 DMSO 溶液的颜色随着 AM 形式的分解从淡黄色变为深橙色。因此,可以通过颜色变化来监测 AM 酯的水解。

General Protocol (for Human Neutrophil)*Reagents:– 1 mM BCECF-AM/DMSO solution (1 mg BCECF in 1.45 ml DMSO)– HEPES buffer saline (20 mM HEPES, 153 mM NaCl, 5 mM KCl, 5 mM glucose, pH 7.4)

Protocol:1. Suspend cells in HEPES buffer solution to prepare 4×107 cells per ml.2. Add 1 mM BCECF-AM/DMSO solution to the cell suspension to prepare 3 μM BCECF-AM (1/300 vol of cell suspension) as the final concentration.3. Incubate the cell suspension at 37ºC for 30 minutes.4. Wash the cells 3 times with HEPES buffer saline and then prepare 3×106 cells per ml of the cell suspension.5. Determine the fluorescence intensity using a fluorescence microscope or a confocal laser microscope coupled with an image analyzer.

* Cell staining conditions depend on cell type, so it is necessary to optimize the conditions for each experiment

1. R. A. Steinhardt, et al., Development of K+-conductance and Membrane Potentials in Unfertilized Sea Urchin Eggs After Exposure to NH4OH. Nature. 1973;241:400-401.2. T. J. Rink, et al., Cytoplasmic pH and Free Mg2+ in Lymphocytes. J Cell Biol. 1982;95:189-196.3. A. M. Paradiso, et al., Na+ -H+ Exchange in Gastric Glands as Measured with a Cytoplasmic-trapped, Fluorescent pH Indicator. PNAS. 1984;81:7436-7440.4. S. Grinstein, et al., Phorbol Ester-induces Changes of Cytoplasmic pH in Neutrophils: Role of Exocytosis in Na+ – H+ Exchange. Am J Physiol. 1985;248:C379-C386.5. G. B. Zavoico, et al., Regulation of intracellular pH in human platelets. Effects of thrombin, A23187, and ionomycin and evidence for activation of Na+/H+ exchange and its inhibition by amiloride analogs. J Biol Chem. 1986;261:13160-13167.6. G. R. Bright, et al., Fluorescence Ratio Imaging Microscopy: Temporal and Spatial Measurements of Cytoplasmic pH. J Cell Biol. 1987;104:1019-1033.7. C. Aalkjaer, et al., Intracellular pH Regulation in Resting and Contracting Segments of Rat Mesenteric Resistance Vessels. J Physiol. 1988;402:391-410.8. K. Tsujimoto, et al., Intracellular pH of Halobacteria Can Be Determined by the Fluorescent Dye 2 E 7 Ebis(carboxyethyl)-5(6)-carboxyfluorescein. Biochem Biophys Res Commun. 1988;155:123-129.9. M. A. Kolber, et al., Measurament of Cytotoxicity by Target Cell Release and Retention of the Fluorescent Dye Bis-carboxyethylcarboxyfluorescein(BCECF). J Immunol Methods. 1988;108:255-264.10. H. Harada, et al., cAMP Activates Cl-/HCO3 – Exchange for Regulation of Intracellular pH in Renal Epithelial Cells. Biochim Biophys Acta. 1991;1092:404-407.11. C. C. Freudenrich, et al., Intracellular pH Modulates Cytosolic Free Magnesium in Cultured Chicken Heart Cells. Am J Physiol. 1992;262:C1024-C1030.12. K. Khodakhah, et al., Functional Heterogeneity of Calcium Release by Inositol Triphosphate in Single Purkinje Neurones, Cultured Cerebellar Astorocytes, and Peripheral Tissues. PNAS. 1993;90:4976-4980.13. G. Boyarsky, et al., Superiority of in vitro Over in vivo Calibrations of BCECF in Vascular Smooth Muscle Cells. FASEB J. 1996;10:1205-1212.14. S. A. Weston, et al., New Fluorescent Dyes for Lymphocyte Migration Studies Analysis by Flow Cytometry and Fluorescent Microscopy. J Immunol Methods. 1990;133:87-97.15. L. S. De Clerck, et al., Use of Fluorescent Dyes in the Determination of Adherence of Human Leucocytes to Endothelial Cells and the Effects of Fluorochromes on Cellular Function. J Immunol Methods. 1994;172:115-124.

Dojindo细胞分析

细胞活力和细胞毒性测定用于药物筛选和化学物质的细胞毒性测试。Dojindo开发了高度水溶性的四唑盐,称为WST。WST-8是高度稳定的WST,用于Cell Counting Kit-8(CCK-8)。由于WST-8甲maz是水溶性的,因此不会形成晶体。因此,不需要诸如MTT测定的增溶过程。此外,CCK-8的检测灵敏度高于其他四唑盐,例如MTT,XTT,MTS或WST-1。

WST检测机制

 

ß-半乳糖苷酶检测试剂

细胞增殖/细胞毒性转染细胞染色细胞内荧光探针细菌染色微生物活力测定干细胞分化SPiDER-ßGal线粒体检测细胞代谢

应用 产品展示
细胞生长检测,药物筛选,比色/荧光检测 细胞计数试剂盒-8
细胞计数试剂盒8 + 96孔有机硅定向剂
细胞计数试剂盒-F
细胞毒性LDH检测试剂盒
-WST 96孔有机硅定向剂
MTT
了解检测机制的差异: 点击这里
细胞周期分析 细胞周期测定溶液深红色
细胞周期测定溶液蓝色