[EN] FLUORESCENT CALCIUM INDICATORS THAT ARE RATIOMETRIC AND EMIT IN THE RED SPECTRUM<br/>[FR] INDICATEURS DE CALCIUM FLUORESCENTS QUI SONT RATIOMÉTRIQUES ET ÉMETTENT DANS LE SPECTRE ROUGE
申请人:ASANTE RES LLC
公开号:WO2011047391A1
公开(公告)日:2011-04-21
A new generation of fluorescent ion indicators for measuring cytosolic concentrations of calcium. These new indicators emit in the red portion of the visible spectrum and are ratiometric. The ratiometry consists of shifting in the emission upon binding calcium when exciting with an argon laser at 488 nm. These indicators also show marked increases in red fluorescence when excited with visible light at longer wavelengths. Like all calcium indicators, they comprise the usual chelating portion based on BAPTA (Bis Amino Phenyl Tetraacetic Acid) and a fluorophore portion, either a seminaphthofluorescein/seminaphthorhodamine or dinaphthofluorescein, which enable ratiometry. Unlike other naphthofluoresceins, the pKa has been adjusted on the naphtho moiety to make it suitable for biological calcium measurements. The invention relates to the structures of the indicators and to the method of synthesizing these indicators.
新一代的荧光离子指示剂用于测量细胞质中钙的浓度。这些新型指示剂在可见光谱的红光部分发光,并且是比率计的。这种比率计测量是通过在488纳米的氩激光激发下,结合钙时发射光的移位来实现的。这些指示剂在使用较长波长的可见光激发时,也会显示出红色荧光的显著增加。与所有钙指示剂一样,它们包含基于BAPTA(双氨基酸苯基四乙酸)的常规螯合部分和一个荧光团部分,这个荧光团部分可以是半萘酚荧光素/半萘酚罗丹明或二萘酚荧光素,这使得能够进行比率计测量。与其他萘酚荧光素不同,pKa值已对萘基团进行了调整,使其适合于生物钙测量。本发明涉及这些指示剂的结构以及合成这些指示剂的方法。