Fluo-3AM is one of the most commonly used fluorescent probes to detect intracellular calcium ion concentration.After it penetrates the cell membrane and enters the cell, it is cleaved by the esterase in the cell to form Fluo-3, so as to be retained in the cell.Fluo-3 is almost non-fluorescent when it exists in the form of free ligand, but it can produce strong fluorescence when it combines with intracellular calcium ions, with a maximum excitation wavelength of 506nm and a maximum emission wavelength of 526nm. In actual detection, the recommended excitation wavelength is about 488nm and the emission wavelength is 525-530nm. Changes in intracellular calcium concentration can be detected using laser confocal microscopy or flow cytometry[1-4].
References:
[1]. Loughrey CM, MacEachern KE, et,al. Measurement of the dissociation constant of Fluo-3 for Ca2+ in isolated rabbit cardiomyocytes using Ca2+ wave characteristics. Cell Calcium. 2003 Jul;34(1):1-9. doi: 10.1016/s0143-4160(03)00012-5. PMID: 12767887.
[2]. Ji S, Li S, Zhao X, et,al.Protective role of phenylethanoid glycosides, Torenoside B and Savatiside A, in Alzheimer's disease. Exp Ther Med. 2019 May;17(5):3755-3767. doi: 10.3892/etm.2019.7355. Epub 2019 Mar 7. PMID: 30988761; PMCID: PMC6447766.
[3]. Williams PDE, Verma S, et,al.Adapting techniques for calcium imaging in muscles of adult Brugia malayi. Invert Neurosci. 2020 Aug 16;20(3):12. doi: 10.1007/s10158-020-00247-1. PMID: 32803437; PMCID: PMC7891862.
[4]. Williams PDE, Kashyap SS, et,al.Diethylcarbamazine, TRP channels and Ca2+ signaling in cells of the Ascaris intestine. Sci Rep. 2022 Dec 9;12(1):21317. doi: 10.1038/s41598-022-25648-7. PMID: 36494409; PMCID: PMC9734116.
Fluo-3AM是最常用的检测细胞内钙离子浓度的荧光探针之一。它穿透细胞膜进入细胞后被细胞内的酯酶剪切形成 Fluo-3 ,从而被滞留在细胞内。 Fluo-3 若以游离配体形式存在时几乎是非荧光性的,但是当它与细胞内钙离子结合后可以产生较强的荧光,最大激发波长为 506nm,最大发射波长为 526nm 实际检测时推荐使用的激发波长为 488nm 左右,发射波长为 525~530nm。 可以使用激光共聚焦显微镜或流式细胞仪检测细胞内钙离子浓度的变化[1-4]。
















