A Synthetic Fluorescent Mitochondria‐Targeted Sensor for Ratiometric Imaging of Calcium in Live Cells
作者:Diana Pendin、Rosa Norante、Andrea De Nadai、Gaia Gherardi、Nicola Vajente、Emy Basso、Nina Kaludercic、Cristina Mammucari、Cristina Paradisi、Tullio Pozzan、Andrea Mattarei
DOI:10.1002/anie.201902272
日期:2019.7.15
Ca2+ handling by mitochondria is crucial for cell life and the direct measure of mitochondrial Ca2+ concentration in living cells is of pivotal interest. Genetically‐encoded indicators greatly facilitated this task, however they require demanding delivery procedures. On the other hand, existing mitochondria‐targeted synthetic Ca2+ indicators are plagued by several drawbacks, for example, non‐specific
线粒体对Ca 2+的处理对于细胞生命至关重要,直接测量活细胞中线粒体Ca 2+的浓度至关重要。基因编码的指标极大地促进了这一任务,但是它们要求苛刻的交付程序。另一方面,现有的以线粒体为靶标的合成Ca 2+指示剂受到若干缺点的困扰,例如非特异性定位,泄漏,毒性。在这里,我们报告了一种新型的荧光Ca 2+传感器mt-fura-2的合成和表征,该传感器是通过将两个三苯基phosph阳离子与Ca 2+指示剂fura-2的分子骨架偶联而获得的。Mt-fura-2结合Ca 2+用的≈1.5μ的解离常数米体外。当以乙酰氧基甲基酯的形式负载在不同的细胞类型中时,该探针显示出适当的线粒体定位并可以准确测量基质[Ca 2+ ]的变化,证明其优于现有染料。我们描述了mt-fura-2的合成,表征以及将其应用于遗传编码指示剂难以递送的细胞类型。