Visible wavelength fluorescent calcium indicators that are (i) leakage resistant and (ii) operate near membranes
申请人:Minta Akwasi
公开号:US20050233467A1
公开(公告)日:2005-10-20
A new class of visible wavelength fluorescent calcium indicators with the BAPTA-like portion rendered zwitterionic by introduction of amine and carboxylic groups. “Fluo” compounds generally function with no extra ionized groups. The modified BAPTA moiety confers new properties while retaining ion selectivity and pH insensitivity. The dyes demonstrate reduced cell leakage and improved ability to study calcium near the cell membrane and preserve the fluorescent properties of “fluo” dyes. The modifications include (a) piperazinoacetic acid XIII for the leakage resistance (FLUO-LR), (b) dodecylpiperazine XIII for a near membrane indicator (FLUO-MOMO, FLUO-NOMO amphipathic “fluo” indicators which bind to cellular membranes and respond to calcium near the membrane), and (c) a propionic acid XII for general leakage resistance -FLUO-LOJO, FLUO-KOJO “fluo” indicators with an extra charge that enables them to resist leakage).
一种新的可见光荧光钙指示剂,其BAPTA类部分通过引入胺和羧基使其带有两性离子。 "Fluo"化合物通常不需要额外的离子化基团。修改后的BAPTA基团保留了离子选择性和pH不敏感性的同时赋予了新的性质。这些染料表现出降低的细胞泄漏和改善了研究细胞膜附近钙离子的能力以及保持“fluo”染料的荧光特性。这些修改包括(a)对偶氮基乙酸XIII用于防泄漏(FLUO-LR),(b)十二烷基哌嗪XIII用于近膜指示剂(FLUO-MOMO,FLUO-NOMO两性“fluo”指示剂,它们结合到细胞膜并对膜附近的钙离子做出反应),以及(c)丙酸XII用于一般的防泄漏-FLUO-LOJO,FLUO-KOJO“fluo”指示剂带有额外的电荷,使它们能够抵抗泄漏。